Relevant bibliographies by topics / Self-assembled monolayer (SAM)

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Self-assembled monolayer (SAM)'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Self-assembled monolayer (SAM)"

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Takeuchi, Kai, Junsha Wang, Beomjoon Kim, Tadatomo Suga, and Eiji Higurashi. "Room temperature bonding of Au assisted by self-assembled monolayer." Applied Physics Letters 122, no. 5 (January 30, 2023): 051603. http://dx.doi.org/10.1063/5.0128187.

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The surface activated bonding (SAB) technique enables room temperature bonding of metals, such as Au, by forming metal bonds between clean and reactive surfaces. However, the re-adsorption on the activated surface deteriorates the bonding quality, which limits the applicability of SAB for actual packaging processes of electronics. In this study, we propose and demonstrate the prolongation of the surface activation effect for room temperature bonding of Au by utilizing a self-assembled monolayer (SAM) protection. While the bonding without SAM fails after exposure of the activated Au surface to ambient air, the room temperature bonding is achieved using SAM protection even after 100 h exposure. The surface analysis reveals that the clean and activated Au surface is protected from re-adsorption by SAM. This technique will provide an approach of time-independent bonding of Au at room temperature.
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Jennane, Jamila, Tanya Boutros, and Richard Giasson. "Photolithography of self-assembled monolayers: optimization of protecting groups by an electroanalytical method." Canadian Journal of Chemistry 74, no. 12 (December 1, 1996): 2509–17. http://dx.doi.org/10.1139/v96-281.

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Patterned surfaces presenting a high density of chemically reactive functional groups can be prepared through photolithography of self-assembled monolayers (SAM). In this paper, we report the synthesis and the evaluation of three reagents that can be used in SAM-photolithographic applications. These reagents are made up of a triethoxysilylpropylamine moiety in which the amine is temporarily blocked by photolabile protecting groups: NVOC (o-nitroveratryloxycarbonyl), ONB (o-nitrobenzyl), or DDZ (α,α-dimethyl-3,5-dimethoxybenzyloxycarbonyl). The presence of the triethoxysilyl group allows self-assembled monolayer formation. Release of chemically reactive amino groups is achieved by irradiation of the surface. An electroanalytical method was developed and used to monitor and optimize the three steps of the methodology occurring on surfaces: monolayer formation, photodeprotection, and subsequent functionalization of the released amino groups. Quantitative information on the efficiency of the photodeprotection step was obtained by this method. It was found that the DDZ group is superior to the ONB and NVOC photolabile protecting groups for SAM-photolithographic applications. Percentages of liberated amino groups are generally above 50% with the DDZ group, while they are generally inferior to 25% and 2% for NVOC and ONB, respectively. These differences are attributed to the destruction of some of the released amino groups through a subsequent reaction with the photoproduct, o-nitrosobenzaldehyde for ONB and 3,4-dimethoxy-6-nitrosobenzaldehyde for NVOC, and to partial loss or destruction of the monolayer during prolonged irradiations. Key words: self-assembled monolayers, surface modification, photolithography, photolabile protecting groups, cyclic voltammetry.
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Lykova, Maria, Iuliana Panchenko, Ulrich Künzelmann, Johanna Reif, Marion Geidel, M. Jürgen Wolf, and Klaus-Dieter Lang. "Characterisation of Cu/Cu bonding using self-assembled monolayer." Soldering & Surface Mount Technology 30, no. 2 (April 3, 2018): 106–11. http://dx.doi.org/10.1108/ssmt-10-2017-0033.

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Purpose Cu/Cu diffusion bonding is characterised by high electrical and thermal conductivity, as well as the mechanical strength of the interconnects. But despite a number of advantages, Cu oxidises readily upon exposure to air. To break through the adsorbed oxide-layer high temperature and pressure, long bonding time and inert gas atmosphere are required during the bonding process. This paper aims to present the implementation of an organic self-assembled monolayer (SAM) as a temporary protective coating that inhibits Cu oxidation. Design/methodology/approach Information concerning elemental composition of the Cu surface has been yielded by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared (FTIR) spectroscopy. Two types of substrates (electroplated and sputtered Cu) are prepared for thermocompression bonding in two different ways. In the first case, Cu is cleaned with dilute sulphuric acid to remove native copper oxide. In the second case, passivation with SAM followed the cleaning step with dilute sulphuric acid. Shear strength, fracture surface, microstructure of the received Cu/Cu interconnects are investigated after the bonding procedure. Findings The XPS method revealed that SAM can retard Cu from oxidation on air for at least 12 h. SAM passivation on the substrates with sputtered Cu appears to have better quality than on the electroplated ones. This derives from the results of the shear strength tests and scanning electron microscopy (SEM) imaging of Cu/Cu interconnects cross sections. SAM passivation improved the bonding quality of the interconnects with sputtered Cu in comparison to the cleaned samples without passivation. Originality/value The Cu/Cu bonding procedure was optimised by a novel preparation method using SAMs which enables storage and bonding of Si-dies with Cu microbumps at air conditions while remaining a good-quality interconnect. The passivation revealed to be advantageous for the smooth surfaces. SEM and shear strength tests showed improved bonding quality for the passivated bottom dies with sputtered Cu in comparison to the samples without SAM.
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Araki, Yuki, Taito Sekine, Ryongsok Chang, Tomohiro Hayashi, and Hiroshi Onishi. "Molecular-scale structures of the surface and hydration shell of bioinert mixed-charged self-assembled monolayers investigated by frequency modulation atomic force microscopy." RSC Advances 8, no. 43 (2018): 24660–64. http://dx.doi.org/10.1039/c8ra03569e.

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Petrovic, Marian, Ivan Talian, Lenka Skantarova, Andrej Orinak, and Dusan Velic. "TOF-SIMS surface analysis of L-Tryptophan self assembled monolayer." Open Chemistry 12, no. 5 (May 1, 2014): 568–76. http://dx.doi.org/10.2478/s11532-014-0515-5.

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AbstractThis paper dealt with the preparation and characterization of self — assembled monolayersSAM-s of 1-hexadecanethiole and mercapto acetic acid on the silver nanostructure and subsequently the immobilization with amino acid L-Tryptophane. In order to achieve it, we used the electrodeposition of silver onto nanostructured surface of paraffin impregnated graphite electrode (PIGE). Subsequently, we assembled SAM by choosing the 1-hexadecanethiole and mercaptoacetic acid. These two kinds of SAM underwent the functionalization by L-Tryptophan. The observations of silver on PIGE surfaces were performed by scanning electron microscope (SEM). For surface analysis of the SAM functionalized by L-tryphophan, the TOF-SIMS technique was chosen. Finally, the fragmented ions of the immobilized-L-Tryptophan SAM were determined on the basis of suggested residues and three-dimensional structure. The residues show that the ability of L-Tryptophan to build homogeneous structure is better by mercaptoacetic acid SAM structure than by 1-hexadecanethiol. It was observed that L-Tryptophan built compact surface, which, due its chemical properties, can represent very interesting side regarding biocompatibility, homochirality and robustness in the area of life science.
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Neves, Bernardo R. A., Michael E. Salmon, Phillip E. Russell, and E. Barry Troughton. "Comparative Study of Field Emission-Scanning Electron Microscopy and Atomic Force Microscopy to Assess Self-assembled Monolayer Coverage on Any Type of Substrate." Microscopy and Microanalysis 5, no. 6 (November 1999): 413–19. http://dx.doi.org/10.1017/s1431927699990475.

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Abstract: In this work, we show how field emission–scanning electron microscopy (FE-SEM) can be a useful tool for the study of self-assembled monolayer systems. We have carried out a comparative study using FE-SEM and atomic force microscopy (AFM) to assess the morphology and coverage of self-assembled monolayers (SAM) on different substrates. The results show that FE-SEM images present the same qualitative information obtained by AFM images when the SAM is deposited on a smooth substrate (e.g., mica). Further experiments with rough substrates (e.g., Al grains on glass) show that FE-SEM is capable of unambiguously identifying SAMs on any type of substrate, whereas AFM has significant difficulties in identifying SAMs on rough surfaces.
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Singh, Mandeep, Navpreet Kaur, and Elisabetta Comini. "The role of self-assembled monolayers in electronic devices." Journal of Materials Chemistry C 8, no. 12 (2020): 3938–55. http://dx.doi.org/10.1039/d0tc00388c.

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Today, the self-assembled monolayer (SAM) approach for surface functionalization is regarded as highly versatile and compelling, especially in the immobilization of biomolecules and fabrication of novel supramolecular architectures.
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HABIB, HUMA, M. YASAR, S. MEHMOOD, SAIMA RAFIQUE, A. S. BHATTI, and AISHA NAEEM. "THE KINETICS OF THE AS GROWN AND ANNEALED SELF-ASSEMBLED MONOLAYER STUDIED BY FORCE SPECTROSCOPY." Surface Review and Letters 25, no. 02 (February 2018): 1850054. http://dx.doi.org/10.1142/s0218625x18500543.

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The growth of biological systems like DNA, peptides and proteins are accredited to the self-assembly processes from the molecular level to the nanoscale. The flawless immobilization of DNA on any surface is quite an important step to the development of DNA-based biosensors. The present paper reports the use of atomic force microscopy to determine the mechanical properties of the as grown and annealed self-assembled monolayer (SAM) as well as the mutated DNA immobilized on the SAM. The SAM of alkane thiol (16-mercapto-1-hexadecanol) was developed on Au surface, which was then annealed and analyzed for its structural and mechanical properties. The surface coverage, height and monolayer’s order was studied as a function of incubation time and annealing time. Excessive annealing led to the defragmentation and desorption of SAM structures due to breaking of hydrocarbon bonds. AFM was employed to determine the detach separation, pull-off and work of adhesion of the as grown and annealed SAM.
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Yang, Ki Yeon, Jong Woo Kim, Sung Hoon Hong, and Heon Lee. "Patterning of the Self-Assembled Monolayer Using the Zero Residual Nano-Imprint Lithography." Solid State Phenomena 124-126 (June 2007): 523–26. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.523.

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Self-Assembled Monolayer (SAM) is a single layer of ordered molecules absorbed on a surface by chemical bonding between the molecular head group and the surface. The surface properties can be controlled by the terminal functional group of the SAM layer. In order to utilize SAM layers for device applications, SAM layer needs to be patterned as a sub-micron size. Patterning of SAM layer in sub-micron size has been done by various techniques including direct-writing by dip-pen nano lithography, selective etching with UV photons, and selective deposition of SAM layer by &-contact printing. In this study, silane based SAM layer was patterned to the sub-micron size using zero residual Nano imprint Lithography, which is regarded as next generation lithography technique due to its simplicity, high throughput and high resolution pattern transferring capability. Using zero-residual layer imprinting, 300nm~2um sized SAM patterns can successfully fabricated. In order to check the surface property of patterned SAM layer, a solution containing nano Ag particles was spin-coated on the SAM patterned substrate and nano Ag particles were selectively deposited on the substrate.
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Escalera-López, D., E. Gómez, and E. Vallés. "Electrochemical growth of CoNi and Pt–CoNi soft magnetic composites on an alkanethiol monolayer-modified ITO substrate." Physical Chemistry Chemical Physics 17, no. 25 (2015): 16575–86. http://dx.doi.org/10.1039/c5cp02291f.

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CoNi and Pt–CoNi magnetic layers on indium-tin oxide (ITO) substrates modified by an alkanethiol self-assembled monolayer (SAM) have been electrochemically obtained as an initial stage to prepare semiconducting layer-SAM-magnetic layer hybrid structures.
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Dissertations / Theses on the topic "Self-assembled monolayer (SAM)"

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Bollani, Monica. "Self-assembled monolayer (SAM) sensors realisation on Si (001) : surface modification, film growth, SAM and sensor characterisation." Aix-Marseille 3, 2000. http://www.theses.fr/2000AIX30072.

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The aim of this thesis is to report the results of an investigation aimed at exploiting synthetic methods to graft organic molecules onto (001) Si as well as at evaluating the applicability of SAM docking in the development of nanodevices. The target of this dissertation is to study a new nucleophylic reaction to bond directly the organic molecules at the surface. In the first part of this work we have focused onto silicon surface preparation. We have pointed out how the RCA cleaning method results in a modification of the structure of the first atomic layers of Si. We have demonstrated by HRTEM and EELS studies that the change of the lattice spacing is related to the subsequent Si oxidation that is known to occur by inward diffusion and insertion of oxygen in bond-centred positions in crystalline silicon. Such a process is favoured by the strain field due to the surface roughening which is characteristic of alkaline etches. To activate the surface toward chemical grafting reactions we have developed a method leading to bromine termination of the surface. This allowed to form an array of aromatic rings bonded through a covalent Si-C bond (i. E. Not implying oxygen bridges) by nucleophilic addition onto the Si-Br surface bond. We have evaluated the bromine termination and the surface reconstruction by Auger, FTIR and LEED analyses. .
Ce travail porte sur l'investigation et la recherche des methodes du syntesis pour lier à la surface du Si (001) des monocouches organiques. Nous avons évalué l'applicabilité de ces systèmes pour le développement du nano-dispositif dans le domaine du détecteurs. La première partie de cette thèse regarde la préparation de la surface : on a évalué comment la methode du nettoyage (RCA) utilisée pour éliminer la contamination à la surface détermine une modification sur la structure des premières couches du silicone. Par HRTEM et EELS on a demostré que la variation de la distance des paramètres réticulaires des première couches, c'est dû au passage d'oxidation nommé APM qui permit la diffusion et l'insertion du 0 dans le volume du Si. .
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Wu, Jun. "Surface Modified Electrodes and Their Reactivity." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1144448160.

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Ticha, Lawrence Awa. "Development of amperometric biosensor with cyclopentadienylruthenium (II) thiolato schiff base self-assembled monolayer (SAM) on gold." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5394_1341319478.

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A novel cyclopentadienylruthenium(II) thiolato Schiff base, [Ru(SC6H4NC(H)C6H4OCH2CH2SMe)(&eta
5-C2H5]2 was synthesized and deposited as a selfassembled monolayer (SAM) on a gold electrode. Effective electronic communication between the Ru(II) centers and the gold electrode was established by electrostatically cycling the Shiff base-doped gold electrode in 0.1 M NaOH from -200 mV to +600 mV. The SAMmodified gold electrode (Au/SAM) exhibited quasi-reversible electrochemistry. The integrity of this electro-catalytic SAM, with respect to its ability to block and electro-catalyze certain Faradaic processes, was interrogated using Cyclic and Osteryoung Square Wave voltammetric experiments. The formal potential, E0', varied with pH to give a slope of about - 34 mV pH-1. The surface concentration, &Gamma
, of the ruthenium redox centers was found to be 1.591 x 10-11 mol cm-2. By electrostatically doping the Au/SAM/Horseradish peroxidase at an applied potential of +700 mV vs Ag/AgCl, a biosensor was produced for the amperometric analysis of hydrogen peroxide, cumene hydroperoxide and tert-butylhydroperoxide. The electrocatalytic-type biosensors displayed typical Michaelis-Menten kinetics with their limits of detection of 6.45 &mu
M, 6.92 &mu
M and 7.01 &mu
M for hydrogen peroxide, cumene hydroperoxide and tert-butylhydroperoxide respectively.
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Gül, Semra Okur Salih. "Development of nanopatterns on self assembled monolayer (sam) organic films using scanning probe microscope (spm) nanolithography techique/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000541.pdf.

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Thesis (Master)--İzmir Institute Of Technology, İzmir, 2006
Keywords: Atomic force microscope, self assembled monolayer organic films, nanolithografy Includes bibliographical references (leaves. 109-112).
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Cheng, Nan. "The Development of Photosensitive Surfaces to Control Cell Adhesion and Form Cell Patterns." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23248.

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Cell adhesion is the first step of cell response to materials and the extracellular matrix (ECM), and is essential to all cell behaviours such as cell proliferation, differentiation, migration and apoptosis for anchor-dependent cells. Therefore, studies of cell attachment have important implications to control and study cell behaviours. During many developed techniques for cell attachment, the manipulation of surface chemistry is a very important method to control initial cell attachment. To control cell adhesion on a two-dimensional surface is a simple model to study cell behaviours, and is a fundamental topic for cell biology, tissue engineering, and the development of biosensors. From the engineering point of view, the preparation of a material with controllable surface chemistry can help studies of cell behaviours and help scientists understand how surface features and chemistry influence cell behaviours. During the fabrication, the challenge is to create a surface with heterogeneous surface properties in the micro scale and subsequently to guide cell initial adhesion. In order to control cell adhesion in a spatial and temporal manner, a photochemical method to control surface chemistry was employed to control the surface property for cell adhesion in this project. Two photocleavable derivatives of the nitrobenzyl group were tried on two types of surfaces: a model self-assembled monolayer (SAM) with alkanethiol-gold surface and biodegradable chitosan. Reactive functional groups on two different surfaces can be inactivated by covalent binding with these photocleavable molecules, and light can be further introduced into the system as a stimulus to recover their reactivity. By simply applying a photomask with diffe
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Rapisarda, Alessandro. "Novel self-assembled monolayer (SAM) based on calix[n]arenes for application as chemical sensors and optical devices: synthesis, studies and applications." Doctoral thesis, Università di Catania, 2013. http://hdl.handle.net/10761/1281.

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The vast majority of chemical sensors contain a chemically sensitive layer for analytes detection coupled with a transducer which transforms this interaction in a readable signal. It is well-known that calixarenes are used for the molecular recognition of ions, amino acids, hormones, sugars, peptides, nucleic acids, and proteins, which are fundamental substrates in biological and artificial processes. We developed new calix[n]arene based systems that are not only stable but are also capable of molecular recognition towards amino acids once assembled on the gold surface. By suitable modification, the system could become a potential receptor for biologically important amines and proteins.
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Gambarin, Alessandro. "Studio del clustering del monostrato di molecole organiche passivanti nanoparticelle d'oro." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423778.

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The development of nanosystems or so-called "molecular machines" is a great challenge for modern chemistry. This acute scientific effort stems from the multiplicity and significance of the potential application fields, which could range from analytes sensing and biomedicine, to the design of "artificial enzymes", rationally designed supramolecules which possess intrinsic catalytic activity. A top-down approach implies the complete understanding of the mechanisms that govern the processes of formation, assembly and rearrangement of these supramolecules, in order to control and steer them in the desired direction. Metal nanoclusters stabilized by an organic monolayer (SAM, Self-Assembled Monolayers) stand out into the varied review of nanomaterials, because of their particular features, which address them as one of the main platforms on which to shape the concept of molecular machine. The SAM which stabilize the metallic nucleus is nothing more than a supramolecular structure formed by molecules displaying special functional groups, which self-assemble upon the metallic surface, potentially reaching an high spatial organization. The possibility to change at will the chemical structure of adsorbates implies a considerable flexibility in modulating the physicochemical properties of these nanomaterials: to date gold nanoparticles (AuNPs) stabilized by alkyl and functionalized thiols, such as nucleic acids, oligopeptides, polysaccharides have been synthesized. Moreover, mixed SAM AuNPs synthesis has been reported in literature: in this case the properties of different types of adsorbates could be mediated, or possess synergistic activity. In this Ph.D. Thesis several research projects have been developed, each one relating to specific properties and applications of omoligand and mixed monolayer AuNPs. Several experimental evidences reported in literature suggest that in mixed monolayer AuNPs, adsorbates could undergo phase segregation processes: in the first part, mixed monolayer gold nanoparticles stabilized by photoresponsive groups containing derivatives (azobenzene and pyrene) have been synthesized and characterized, in order to correlate the optical properties of the samples with the topological arrangement of adsorbates into the monolayer. In the second part, the exposition focus upon nanoparticle gold core packing and monolayer’s self-assembly mechanisms in Peng-Scrimin synthetic process, the one commonly used in our laboratory. This study has been considered useful in order to increase accuracy of mixed monolayers synthesis and to explain the occurrence of "sorting" phenomena (asymmetric distribution of adsorbates onto metallic nuclei into the sample). The properties of some functionalized monolayers have also been investigated through exchange experiments, initially monitored by means of fluorescence emission spectroscopy and then by 1H- NMR, in order to justify experimental evidences of phase segregation recently published by the research group in which I spent the Doctorate . In the third part, supramolecular interaction between mixed monolayer AuNPs (stabilized by a pyrene derivative co-adsorbed with a phosphorylcholine one) and single-walled carbon nanotubes (SWNTs), pristine (non-functionalized) and PEG-ylated (conjugated with polyoxyethylene chains), has been investigated, and a protocol for their complexation to the obtaining of nanocomposites has been developed
La costruzione di nanosistemi o cosiddette “macchine molecolari” rappresenta una grande sfida per la chimica moderna. L’intenso sforzo scientifico per il raggiungimento di questo obiettivo deriva dalla molteplicità e rilevanza dei potenziali campi applicativi, che potrebbero spaziare dal sensing di analiti, alla biomedicina, alla progettazione di “enzimi artificiali”, supramolecole progettate razionalmente in modo da possedere attività catalitica intrinseca. Un design a tavolino implica tuttavia la totale comprensione dei meccanismi che governano i processi di formazione, assemblaggio e riarrangiamento di queste supramolecole, in modo da poterli controllare e indirizzare nella direzione voluta. I nanoclusters metallici passivati da monolayers organici (SAM, Self Assembled Monolayers) presentano peculiari caratteristiche che li individuano, nel variegato panorama dei nanomateriali, come una delle principali piattaforme sulle quali plasmare il concetto di macchina molecolare. I SAM che stabilizzano i nuclei metallici non sono altro che strutture supramolecolari costituite da molecole dotate di particolari gruppi funzionali affini alla superficie del nanocluster, che si autoassemblano raggiungendo potenzialmente un'elevata organizzazione spaziale. La possibilità di modificare a piacimento la struttura chimica degli adsorbati comporta una notevole elasticità nel modulare le proprietà fisico chimiche di questi nanomateriali: sono ad oggi state sintetizzate nanoparticelle d’oro (AuNPs) stabilizzate da tiolati alchilici e funzionalizzati, acidi nucleici, oligopeptidi, polisaccaridi. E’ stata inoltre ampiamente riportata in letteratura la sintesi di AuNPs con SAM a composizione mista, in cui le proprietà dei differenti tipi di adsorbati vengono tra loro mediate, o possiedono attività sinergica. In questa Tesi di Dottorato vengono sviluppati diversi progetti di ricerca che riguardano specifiche proprietà e applicazioni di AuNPs stabilizzate da monostrati a composizione unitaria e mista. Numerose evidenze sperimentali riportate in letteratura inducono a supporre che in SAM a composizione mista siano possibili processi di segregazione di fase degli adsorbati. Nella prima parte sono state perciò sintetizzate e caratterizzate AuNPs stabilizzate da derivati tiolici contenenti gruppi fotoresponsivi (azobenzenico e pirenilico) in monostrati a composizione mista, nel tentativo di correlare le proprietà ottiche dei campioni con le modalità di impaccamento del monostrato. Nella seconda parte sono state approfondite le modalità di formazione del SAM nel processo sintetico Peng-Scrimin, al fine di aumentare il livello di accuratezza nella sintesi di monostrati misti e di spiegare l’occorrenza dei fenomeni di “sorting” (distribuzione asimmetrica degli adsorbati sui nuclei metallici in fase di sintesi). Sono state inoltre investigare le proprietà di alcuni monostrati funzionalizzati, tramite esperimenti di scambio monitorati tramite spettroscopia di emissione di Fluorescenza e 1H-NMR, al fine di giustificare alcune evidenze sperimentali di segregazione di fase recentemente pubblicate dal gruppo di ricerca nel quale ho svolto il Dottorato. Nella terza parte è stata investigata l’interazione supramolecolare che si verifica tra AuNPs a monostrato misto stabilizzate da un derivato tiolico del pirene co-adsorbito con un derivato tiolico della fosforilcolina, e nanotubi di carbonio a parete singola (SWNTs) pristini (non funzionalizzati) e PEGilati (coniugati con catene poliossietilenglicole), ed è stato messo a punto un protocollo per la loro complessazione e l’ottenimento di nanocompositi
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Besharat, Zahra. "Adsorption of molecular thin films on metal and metal oxide surfaces." Doctoral thesis, KTH, Materialfysik, MF, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-195613.

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Metal and metal oxides are widely used in industry, and to optimize their performance their surfaces are commonly functionalized by the formation of thin films. Self-assembled monolayers (SAMs) are deposited on metals or metal oxides either from solution or by gas deposition. Thiols with polar terminal groups are utilized for creating the responsive surfaces which can interact electrostatically with other adsorbates. Surface charge effects wetting and adhesion, and many other surface properties. Polar terminal groups in thiols could be used to modify these factors. Mixed SAMs can provide more flexible surfaces, and could change the resulting surface properties under the influence of factors such as pH, temperature, and photo-illumination. Therefore, in order to control these phenomena by mixed polar-terminated thiols, it is necessary to understand the composition and conformation of the mixed SAMs and their response to these factors. In this work, mixtures of thiols with carboxylic and amino terminal groups were studied. Carboxylic and amino terminal groups of thiol interact with each other via hydrogen bonding in solution and form a complex. Complexes adsorb to the surface in non-conventional orientations. Unmixed SAMs from each type, either carboxylic terminated thiols or amino terminated thiols are in standing up orientation while SAMs from complexes are in an axially in-plane orientation. Selenol is an alternative to replace thiols for particular applications such as contact with biological matter which has a better compatibility with selenol than sulfur. However, the    Se-C bond is weaker than the S-C bond which limits the application of selenol. Understanding the selenol adsorption mechanism on gold surfaces could shed some light on Se-C cleavage and so is investigated in this work. Se-C cleavage happens in the low coverage areas on the step since atoms at steps have lower coordination making them more reactive than atoms on the terraces.  Another area where the self-assembly of molecules is of importance is for dye sensitized solar cells, which are based on the adsorption of the dye onto metal oxides surfaces such as TiO2.The interface between the SAM of dye and the substrate is an important factor to consider when designing dyes and surfaces in dye sensitized solar cells (DSSCs). The quality of the self-assembled monolayers of the dye on the TiO2 surface has a critical influence on the efficiency of the DSSCs.  Creation of just a monolayer of dye on the surface could lead to an efficient current of photo-excited electrons to the TiO2 and degeneration of the dye by redox. This work, T-PAC dye showed island growth with some ad-layer that is not in contact with the surface, whereas the MP13 dye adsorption is laminar growth.  Cuprite (Cu2O) is the initial and most common corrosion product for copper under atmospheric conditions. Copper could be a good replacement for noble metal as catalysts for methanol dehydrogenation. Knowledge about the structure of Cu2O(100) and Cu2O(111) surfaces could be used to obtain a deeper understanding of methanol dehydrogenation mechanisms with respect to adsorption sites on the surfaces. In this work, a detailed study was done of Cu2O(100) surface which revealed the possible surface structures as the result of different preparation conditions. Studies of the structure of Cu2O(100) and Cu2O(111) surfaces show that Cu2O(100) has a comparatively stable surface and reduces surface reactivity. As a consequence, dehydrogenation of methanol is more efficient on the Cu2O(111) surface. The hydrogen produced from methanol dehydrogenation is stored in oxygen adatom sites on both surfaces.

QC 20161107

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Eder, Katja Daniela. "Surfaces and interfaces in nano-scale and nano-structured materials." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17217.

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In this thesis, advanced characterisation methods, including atom probe tomography (APT) and transmission Kikuchi diffraction (TKD) were employed to study surface and interfaces in a range of nano-scale and nano-structured materials. These techniques were used to measure solute segregation towards grain boundaries and to explore the relationship between grain boundary segregation and grain boundary mobility. APT was also used to characterise the structure of nanoparticles used as catalysts, and the adsorption behaviour of sulphur on catalytic surfaces, to gain more information about the structure-activity relationships, and deactivation processes. This research included the development and improvement of new and existing APT sample preparation techniques, conducting the experiments, and data analysis. The first part of this thesis is concerned with nanocrystalline alloys processed by severe plastic deformation. In the second part the exceptional hardening of an 316L austenitic steel during annealing was also investigated using APT. This thesis also concentrated on the study of nanoparticles for catalysis via APT. Systematic investigations of different APT sample preparation techniques were performed in order to find a way of producing reproducible and reliable specimens. Different acquisition parameters, substrates and coatings were tested to improve the APT data quality. Experiments were conducted in which needles were dipped in thiophene. Here the aim was to investigate the phenomenon of sulphur poisoning by using APT to investigate how thiophene bonds with different metal substrates. A glovebag setup was designed for the transfer of APT samples in a controlled environment, to avoid oxidation of the samples. This allowed the comparison of oxidised and un-oxidised specimen states. In the last part of this thesis, the accuracy of crystallographic information contained within APT datasets was verified for the first time by comparing the datasets to TKD measurements.
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Belgardt, Christian. "Herstellung mikrostrukturierter OTS-Monolagen auf Siliziumoxidoberflächen." Master's thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-86379.

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Die Oberflächeneigenschaften eines Festkörpers können mit Hilfe dünner, durch Selbstorganisation gebildeter Molekülschichten aus Alkoxysilan-Molekülen gezielt verändert werden. Mikrostrukturierte selbstangeordnete Monolagen (SAM) können für die Anwendung in Bauelementen aus organischen Halbleitern von großem Interesse sein. Mikrokontaktdruck und Photolithographie sind zwei etablierte Verfahren, die jedoch Vorlagen und Masken zur Strukturierung benötigen. Dadurch entstehen bei häufig wechselnden Strukturen nicht zu vernachlässigende Rüstzeiten und Kosten. In der vorliegenden Arbeit wird die Erzeugung lateral strukturierter Schichten von Octadecyltrichlorsilan (OTS) auf Siliziumoxidoberflächen am konkreten Beispiel zweier alternativer, sowohl maskenloser als auch kontaktloser Methoden demonstriert: (i) Tintenstrahlverfahren als rein additive Strukturierung, und (ii) laserinduzierte, photothermische Desorption als subtraktive Strukturierung einer OTS-SAM . Für das Tintenstrahldruckverfahren wird an einem Kontaktwinkelmessgerät eine Methode zur Beobachtung und Auswertung der Tropfenverdampfung implementiert und ein Modell für kleine Tropfen entwickelt. Für die subtraktive Strukturierung werden an einem selbst entwickelten Versuchsaufbau die leistungs- und geschwindigkeitsabhängige Strukturbreite untersucht. Die Ergebnisse der beiden Technologieansätze werden verglichen
With help of thin layers of alkoxysilane molecules formed by self-assembly, the surface properties of solids can be controlled. Microstructured self-assembled monolayers (SAMs) are interesting for applications in components based on organic semiconductors. Two established technologies for the structuring of molecular monolayers are microcontact printing and photolithography, for which templates and masks need to be structured. In this way, setting times and costs are high if variable patterns have to be structured. In this work, the fabrication of laterally structured monolayers from octadecyltrichlorosilane (OTS) is demonstrated for two examples of alternative, both template-free and maskless technologies: (i) inkjet as a purely additive method, and (ii) photothermal laser desorption as a subtractive structuring of an OTS-SAM. For the inkjet technology, a method for the observation and analysis of the evaporation of a droplet is implemented at a goniometer and a mathematical model for small inkjet droplets is extrapolated, For the subtractive laser structuring, the achievable patterning resolution is investigated as a function of laser intensity and scanning speed. The results of both technological approaches are compared
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Book chapters on the topic "Self-assembled monolayer (SAM)"

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Kondo, Toshihiro, Ryo Yamada, and Kohei Uosaki. "Self-Assembled Monolayer (SAM)." In Organized Organic Ultrathin Films, 7–42. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527654666.ch2.

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Wong, C. K. Y., H. Fan, G. Q. (Kouchi) Zhang, and M. M. F. Yuen. "Molecular Design of Self-Assembled Monolayer (SAM) Coupling Agent for Reliable Interfaces by Molecular Dynamics Simulation." In Molecular Modeling and Multiscaling Issues for Electronic Material Applications, 133–48. Boston, MA: Springer US, 2012. http://dx.doi.org/10.1007/978-1-4614-1728-6_9.

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Tay, Francis E. H., S. J. O’Shea, Andrew T. S. Wee, Poh Chong Lim, and Andojo Ongkodjojo. "Self-Assembled Monolayers (SAM) for Tunneling Sensors." In Microsystems, 113–32. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-5791-0_6.

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Bhure, Rahul, and Anil Mahapatro. "Surface Patterning Using Self Assembled Monolayers (SAMs)." In ACS Symposium Series, 65–107. Washington, DC: American Chemical Society, 2010. http://dx.doi.org/10.1021/bk-2010-1054.ch004.

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Bhushan, Bharat. "Self-assembled Monolayers (SAMs) for Nanotribology and Surface Protection." In Nanotribology and Nanomechanics, 641–88. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51433-8_13.

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Bhushan, Bharat. "Self-Assembled Monolayers (SAMs) for Controlling Adhesion, Friction, and Wear." In Springer Handbook of Nanotechnology, 1379–416. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-29857-1_43.

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Armini, Silvia, Yannick Vandelaer, Alicja Lesniewska, Vladimir Cherman, Inge De Preter, Fumihiro Inoue, Jaber Derakhshandeh, George Vakanas, and Eric Beyne. "Thiol-Based Self-Assembled Monolayers (SAMs) as an Alternative Surface Finish for 3D Cu Microbumps." In TMS2015 Supplemental Proceedings, 1353–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093466.ch161.

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Armini, Silvia, Yannick Vandelaer, Alicja Lesniewska, Vladimir Cherman, Inge De Preter, Fumihiro Inoue, Jaber Derakhshandeh, George Vakanas, and Eric Beyne. "Thiol-Based Self-Assembled Monolayers (SAMs) as an Alternative Surface Finish for 3D Cu Microbumps." In TMS 2015 144th Annual Meeting & Exhibition, 1355–60. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48127-2_161.

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TAN, CHUAN SENG. "Self-Assembled Monolayer (SAM) Passivation of Copper and Its Application in Wafer Bonding." In Encyclopedia of Packaging Materials, Processes, and Mechanics, 81–127. World Scientific, 2019. http://dx.doi.org/10.1142/9789811209680_0006.

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Takai, O., and K. Hayashi. "Chapter 6 Micro/Nanolithography Using Self-Assembled Monolayers (SAMs)." In Interface Science and Technology, 141–75. Elsevier, 2007. http://dx.doi.org/10.1016/s1573-4285(06)14006-5.

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Conference papers on the topic "Self-assembled monolayer (SAM)"

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Masuko, Masabumi, Hiroya Miyamoto, and Akihito Suzuki. "Shear Strength and Durability of Self Assembled Monolayer." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44221.

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A well-defined self-assembled monolayer (SAM) of octadecyltrichlorosilane (OTS) on a very smooth Si wafer or glass disk was prepared and the tribological performance was studied using a glass ball and a steel ball as a counter specimen. Shear strength and durability of OTS-SAM were discussed considering a difference of the surface roughness of specimen couples.
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Lim, D. F., X. F. Ang, J. Wei, C. M. Ng, and C. S. Tan. "Copper to Copper Direct Bonding Assisted by Self-Assembled Monolayer." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38565.

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In this article, a self-assembled monolayer (SAM) is applied onto the copper surface in an attempt to lower the required bonding temperature. Alkane-thiol with 6-carbon chain length is used and tested for bonding experiment. The adsorption of SAM is confirmed by the sharp rise of the water contact angle measurement and the reduced in the surface roughness. Next, the desorption of SAM is done at a high temperature anneal (<300°C) in an inert ambient and its properties are characterized by the water contact angle measurement and XPS. It is found that the water contact angle measurement decreases sharply close back to the contact angle of the pure blanket copper surface after annealing of SAM. The XPS results also show the ability of SAM in protecting Copper surface from oxidation. Finally, shear test is performed on Cu-Cu structures bonded at low temperature (250°C) in order to verify the SAM behavior in protecting the copper surface from oxidation and enhancement for bonding. The wafer pairs with and without SAM are intentionally exposed in clean room environment for few days. The bonded pieces are diced and subject to shear stress and results show that with SAM protection, shear strength is improved due to the enhancement in grain growth as a result of cleaner surface.
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Collins, Melissa V., Lauren E. S. Rohwer, Andrew D. Oliver, Matthew G. Hankins, and Deidre A. Hirschfeld. "Optimization of anodic bonding to MEMS with self-assembled monolayer (SAM) coatings." In Micromachining and Microfabrication, edited by Rajeshuni Ramesham. SPIE, 2001. http://dx.doi.org/10.1117/12.443007.

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Ramin, Leyla, and Ahmad Jabbarzadeh. "Effect of Loading and Shear Rate on Tribological Behaviour of Dodecanethiol Self Assembled Monolayer on Au(111): A Molecular Dynamic Simulation Study." In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41095.

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Molecular dynamic simulation of nanoscale self assembled monolayers (SAMs) is used to predict the tribological properties of thiol based monolayers attached on Au(111) surfaces. Different loading conditions between 10MPa to 7GPa have been applied to dodecanethiol SHCH2(CH2)10CH3 monolayers to study the molecular structure and physical properties at rest, under loading and under shear. At loads lower than 700MPa, we observe smaller fluctuations in tilt and orientation angles due to a lower level of film compression. Above this critical load, the monolayers backbone starts to compress and a dramatic increase of energy is observed. Film thickness also reduces by 87% as the loading is increased. At loads higher than 5GPa, the SAM monolayer undergoes progressive disorganization resulting in a crushed and disordered system. We have investigated the tribology of the SAM films under various loads and shear rates in the range of 108-1011(s−1). We have found that the friction coefficient increases by increasing the shear rate and decrease by increasing the loading.
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Muslihati, Atqiya, Hatijah Basri, Mohd Sahdan, Kusnanto Wibowo, Nurliyana Rosni, and Marlia Morsin. "The Formation and Organization of Self-Assembled Monolayer (SAM) for Escherichia coli Detection: A Review." In Proceedings of the 2nd International Conference of Science and Technology for the Internet of Things, ICSTI 2019, September 3rd 2019, Yogyakarta, Indonesia. EAI, 2020. http://dx.doi.org/10.4108/eai.20-9-2019.2292104.

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Kawaguchi, Touru, Gota Kikugawa, Ikuya Kinefuchi, Taku Ohara, Shinichi Yatuzuka, and Yoichiro Matsumoto. "Molecular Dynamics Study of Interfacial Thermal Resistance of Mercapto-Alkanol Self-Assembled Monolayer and Water." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18424.

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The interfacial thermal resistance of 11-mercaptoundecanol (-S(CH2)11OH) self-assembled monolayer (SAM) adsorbed on Au(111) substrate and water was investigated using nonequilibrium molecular dynamics simulations. The interfacial thermal resistance was found to be a half of that in the system which consists of 1-dodecanthiol (-S(CH2)11CH3) SAM adsorbed on Au(111) and toluene [Kikugawa G. et al., J. Chem. Phys. (2009)]. The effective thermal energy transfer originates from hydrogen-bond structure between the SAM and water molecules in spite of weak structurization of water molecules near the SAM surface.
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Sheridan, A. K., P. Ngamukot, Philip N. Bartlett, and James S. Wilkinson. "Simultaneous SPR and electrochemical sensing of an alkane-thiol self-assembled monolayer (SAM): toward an optical biosensor." In Second European Workshop on Optical Fibre Sensors. SPIE, 2004. http://dx.doi.org/10.1117/12.566559.

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Chai, Jinan, Baoming Li, and Daniel Y. Kwok. "Selective Surface Modification and Patterning on Self-Assembled Monolayers by a Micro-Plasma Discharge." In ASME 3rd International Conference on Microchannels and Minichannels. ASMEDC, 2005. http://dx.doi.org/10.1115/icmm2005-75172.

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In this paper, we will demonstrate a selective surface patterning method by a micro-plasma discharge. In this method, argon plasma is ignited through a hole of copper clad polyimide microstructure electrodes. As an illustration, experiments were performed in which an octadecanethiol (CH3(CH2)17SH) self-assembled monolayer (SAM) on a gold film is exposed to a microdischarge and subsequently followed by immersion into the 16-mercaptohexadecanoic acid (COOH(CH2)15SH) solution. The octadecanethiol SAM is desorbed upon Ar plasma exposure, allowing the formation of a second SAM on the damaged region [Chai et al, App. Phys. Lett., 86, 034107 (2005)]. The patterned samples are viewed by using optical microscope and scanning electron microscopy. The advantage of this approach is that it is noncontact and eliminates the need of photolithography. The patterned samples can be employed to microfluidic self-propelled movement.
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Lim, Dau Fatt, Jun Wei, Chee Mang Ng, and Chuan Seng Tan. "Low temperature bump-less Cu-Cu bonding enhancement with self assembled monolayer (SAM) passivation for 3-D integration." In 2010 Proceedings 60th Electronic Components and Technology Conference (ECTC). IEEE, 2010. http://dx.doi.org/10.1109/ectc.2010.5490639.

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Tan, Chuan Seng. "Application of self-assembled monolayer (SAM) in low temperature bump-less Cu-Cu bonding for advanced 3D IC." In 2010 5th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT). IEEE, 2010. http://dx.doi.org/10.1109/impact.2010.5699478.

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