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Dissertations / Theses on the topic 'Epitaxie van der Waals'

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Published: 2 November 2024

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1

Journot, Timotée. "Epitaxie van der Waals de GaN sur graphène pour des applications en photonique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI078/document.

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De par ses propriétés physiques remarquables, le GaN est un matériau très attrayant pour la fabrication de composants photoniques. Sa synthèse est en revanche très complexe et reste un obstacle à son utilisation. L’hétéroépitaxie est, pour l’heure, la technique de synthèse la plus employée mais l’absence de substrats cristallins aux propriétés proches de celles du GaN conduit à l’élaboration de couches minces épitaxiées très défectueuses. Bien que les dispositifs à base de GaN soient d’ores et déjà fonctionnels, une augmentation de la qualité cristalline du matériau permettra une amélioration
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2

Rudolph, Reiner. "Quasi-van der Waals-Epitaxie von GaSe auf Si und GaAs Struktur und elektronische Eigenschaften /." [S.l. : s.n.], 1999. http://www.diss.fu-berlin.de/1999/65/index.html.

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3

Marsden, Alexander J. "Van der Waals epitaxy in graphene heterostructures." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77193/.

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Graphene — a two-dimensional sheet of carbon atoms — has surged into recent interest with its host of remarkable properties and its ultimate thinness. However, graphene combined with other materials is starting to attract more attention. These heterostructures can be important for production routes, incorporating graphene into existing technologies, or for modifying its intrinsic properties. This thesis aims to examine the role of van der Waals epitaxy within these heterostructures. First, the graphene-copper interaction during chemical vapour deposition of graphene is investigated. Graphene i
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4

Wisotzki, Elmar. "Quasi-van-der-Waals-Epitaxie von II-VI-Halbleitern auf Schichtgitterchalkogeniden und GaSe-terminierten Si(111)-Oberflächen." [S.l. : s.n.], 2002. http://elib.tu-darmstadt.de/diss/000330.

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5

Vergnaud, Céline. "Optimisation de la croissance de MoSe2 - WSe2 par épitaxie de Van der Waals pour la valleytronique." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALY038.

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Cette thèse a pour objet l’optimisation de la croissance par épitaxie par jets moléculaires dans le régime de van der Waals de couches semi-conductrices bidimensionnelles (2D) de diséléniures de métaux de transition (MoSe2, WSe2) pour les études magnéto-optiques et électriques. Cette optimisation passe par l’amélioration de la qualité cristallographique des couches sur de grandes surfaces en ajustant les paramètres de croissances (température et flux). En particulier, la maîtrise de l’état de surface du substrat est déterminante sur les mécanismes de croissance de ces couches. L’élaboration de
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6

Duraz, Jules. "LEDs flexibles exploitant l'épitaxie van der Waals avec les semi-conducteurs nitrures : application aux implants cochléaires optiques." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST101.

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Le développement de l'optogénétique ouvre un nouveau champ d'application aux sources lumineuses à base de semiconducteurs.Les LEDs à base de nitrure de gallium peuvent, par exemple, être employées dans la réalisation de prototypes d'implants pour restaurer l'audition.Des contraintes particulières apparaissent pour ces applications, avec notamment des critères spécifiques liés à l'émission devant être respectés pour des rayons de courbure de l'ordre du millimètre.L'objectif de cette thèse est de réaliser des LEDs flexibles pouvant atteindre ces rayons de courbure ainsi que de caractériser l'évo
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7

Sant, Roberto. "Exploration par rayonnement synchrotron X de la croissance et de la structure de dichalcogénures 2D." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY075.

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Les dichalcogenures de métaux de transition bidimensionnels (2D) suscitent un grand intérêt pour des applications variées, principalement en optoelectronique. Toutefois, la faible compréhension des mécanismes liés à leur épitaxie, de leur microstructure et de la nature de leur interaction avec le substrat représentent encore des problèmes ouverts. Nous avons exploré un certain nombre de croissances épitaxiales des dichalcogenures 2D préparés par épitaxie à jets moléculaires sur des substrats différents. Nous en avons examiné la structure atomique et essayé d’en modifier certa
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8

Wagner, Christian. "Potential Energy Minimization as the Driving Force for Order and Disorder in Organic Layers." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-38242.

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The topic of this work is the structural characterization and theoretical modeling of organic single and heterolayers. The growth of sub-monolayers and monolayers (ML) of the two polycyclic aromatic hydrocarbons quaterrylene (QT) and hexa-peri-hexabenzocoronene (HBC) on Ag(111) and Au(111) was investigated. A transition from a disordered, isotropic phase to an ordered phase with increasing coverage was found. The lattice of the ordered phase turned out to be coverage dependent. The intermolecular potential was modeled including Coulomb and van der Waals interaction by a force-field approach. T
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9

Ben, Jabra Zouhour. "Study of new heterostructures : silicene on graphene." Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0583.

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Le but de ce travail est la croissance du silicène sur Gr. J'ai décrit le substrat en fonction des conditions d’élaboration par CVD. Lorsque la proportion de H2 est faible il est possible d’obtenir du Gr homogène sur couche tampon (BL) sur SiC. Le STM et LEED montrent la superposition de la maille du Gr et de la reconstruction de la BL représentatif du Gr épitaxié. Lorsque la proportion de H2 est élevée la couche de Gr obtenue est totalement hydrogénée. Ceci est un résultat nouveau car aucun procédé d’intercalation d’hydrogène n’avait permis jusqu’à présent d’hydrogéner totalement les échantil
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10

Bradford, Jonathan. "Growth and characterisation of two-dimensional materials and their heterostructures on sic." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/134400/1/Jonathan_Bradford_Thesis.pdf.

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Atomically thin two-dimensional materials and their hybrids represent an elegant approach to designing and synthesizing functional nanomaterials and are expected to find applications across a broad range of new technologies. This project explored scalable synthesis of various two-dimensional layered materials and their hybrid counterparts on silicon carbide, an industrially relevant device substrate. It demonstrates the integration of graphene, hexagonal boron nitride and transition metal dichalcogenide layers which were characterised by high resolution scanning probe microscopy and electron s
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11

Bezzi, Luca. "Materiali 2D van der Waals." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Dalla scoperta del grafene, molte ricerche sono state condotte sui cosiddetti “materiali 2D”. Questo elaborato si focalizza sulle proprietà strutturali, elettroniche, ottiche ed eccitoniche di due materiali bidimensionali, ossia il grafene il disolfuro di molibdeno (MoS2-1H), quest’ultimo un importante semiconduttore. Le proprietà di questi materiali sono diverse rispetto alla loro controparte massiva (bulk) grafite e MoS2-2H, e un loro confronto è stato preso in considerazione. Come metodo di indagine sono state scelte simulazioni quanto- meccaniche ab initio dei sistemi in esame, un approcci
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12

Boddison-Chouinard, Justin. "Fabricating van der Waals Heterostructures." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38511.

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The isolation of single layer graphene in 2004 by Geim and Novoselov introduced a method that researchers could extend to other van der Waals materials. Interesting and new properties arise when we reduce a crystal to two dimensions where they are often different from their bulk counterpart. Due to the van der Waals bonding between layers, these single sheets of crystal can be combined and stacked with diferent sheets to create novel materials. With the goal to study the interesting physics associated to these stacks, the focus of this work is on the fabrication and characterization of van d
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13

Tiller, Andrew R. "Spectra of Van der Waals complexes." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333415.

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14

Mauro, Diego. "Electronic properties of Van der Waals heterostructures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10565/.

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L’interazione spin-orbita (SOI) nel grafene è attualmente oggetto di intensa ricerca grazie alla recente scoperta di una nuova classe di materiali chiamati isolanti topologici. Questi materiali, la cui esistenza è strettamente legata alla presenza di una forte SOI, sono caratterizzati dall’interessante proprietà di avere un bulk isolante ed allo stesso tempo superfici conduttrici. La scoperta teorica degli isolanti topologici la si deve ad un lavoro nato con l’intento di studiare l’influenza dell’interazione spin-orbita sulle proprietà del grafene. Poichè questa interazione nel grafene è pe
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15

Klein, Andreas. "Energietransferprozesse in matrixisolierten van-der-Waals-Komplexen." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962344761.

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16

Odeyemi, Tinuade A. "Numerical Modelling of van der Waals Fluids." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22661.

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Many problems in fluid mechanics and material sciences deal with liquid-vapour flows. In these flows, the ideal gas assumption is not accurate and the van der Waals equation of state is usually used. This equation of state is non-convex and causes the solution domain to have two hyperbolic regions separated by an elliptic region. Therefore, the governing equations of these flows have a mixed elliptic-hyperbolic nature. Numerical oscillations usually appear with standard finite-difference space discretization schemes, and they persist when the order of accuracy of the semi-discrete scheme is i
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17

Connelly, James Patrick. "Microwave studies of Van der Waals complexes." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:3865eb1d-d288-44c9-8d42-84f7ff2c0608.

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This thesis describes the commissioning and development of a pulsed supersonic nozzle, Fourier-transform microwave spectrometer and its application to the study of several weakly bound van der Waals complexes. A pulsed supersonic expansion, Fourier-transform microwave spectrometer based on the Flygare design with a number of modifications has been constructed with an operating range of 6-18 GHz. A homodyne detection circuit mixing signals to modulus values between dc and 1 MHz is used, requiring two measurements to determine absolute transition frequencies. Transition frequencies are measured
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18

Wright, Nicholas J. "Bound states of Van der Waals trimers." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/5048/.

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A method for calculating the energy levels and wave functions of floppy tri- atomic systems such as rare-gas trimers has been developed. It is based upon a potential-optimized discrete variable representation and takes into account the wide-amplitude vibrations that occur in such systems. The quadrature error that occurs in DVR calculations is analysed and a method of correction implemented. The diagonalisation procedure is based upon a combination of successive diagonalisation and truncation and a Lanczos diagonaliser. Using this method the wave functions of the Ar(_3) Van der Waals trimer ha
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19

Bryan, Robert. "Theoretical studies of Van der Waals clusters." Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4712/.

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The vibrational energy levels of various rare gas trimers, Ar(_3), Ne(_3), He(_3), Ar(_2)Ne and Ne(_2)Ar, have been calculated using a coupled channel approach. We have compared results obtained with previous calculations. The existence of Efi-mov states in He(_3) has been investigated, and no evidence of their existence has been found. The affect of the Eckart conditions on embedding axis into a rotating-vibrating system has been investigated for several rare gas systems. A wide range of rare gas trimers have been studied, Ar(_3), He(_2)Ar, Ar(_2)He, Ar(_2)Ne and Ne(_2)Ar. For each trimer the
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20

Tulegenov, Akyl S. "SIMPER method for van der Waals complexes." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431329.

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21

McDowell, Sean Alistair Courtney. "Theoretical studies of Van der Waals molecules." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259733.

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22

Le, Sueur Catherine Ruth. "Induction effects in Van der Waals complexes." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385523.

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23

Willberg, Dean Michael Zewail Ahmed H. "Picosecond spectroscopy of van der Waals clusters /." Diss., Pasadena, Calif. : California Institute of Technology, 1994. http://resolver.caltech.edu/CaltechETD:etd-04042008-110156.

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24

Columberg, Gieri. "Mikrowellen-Spektroskopie T-förmiger Van der Waals Komplexe /." [S.l.] : [s.n.], 1996. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11636.

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25

Coy, Diaz Horacio. "Preparation and Characterization of Van der Waals Heterostructures." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6212.

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In this dissertation different van der Waals heterostructures such as graphene-MoS2 and MoTe2-MoS2 were prepared and characterized. In the first heterostructure, polycrystalline graphene was synthesized by chemical vapor deposition and transferred on top of MoS2 single crystal. In the second heterostructure, MoTe2 monolayers were deposited on MoS2 by molecular beam epitaxy. Characterization of graphene-MoS2 heterostructures was conducted by spin and angle resolve spectroscopy which showed that the electronic structure of the bulk MoS2 and graphene in this van der Waals heterostructures is modi
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26

Lawrence, Stuart John. "High-resolution spectroscopy of van der Waals molecules." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318824.

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27

Kettley, J. C. "Van der Waals complexes of large aromatic molecules." Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371128.

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28

Althorpe, Stuart C. "Bound state calculations for van der Waals dimers." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319937.

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29

Ma, Qiong Ph D. Massachusetts Institute of Technology. "Optoelectronics of graphene-based Van der Waals heterostructures." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104523.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Research on van der Waals (vdW) materials (homo- or hetero-) is a rapidly emerging field in condensed matter physics. They are layered structures with strong chemical bonding within layers and relatively weak van der Waals force to combine layers together. This unique layer-bylayer nature makes it easy to exfoliate layers out and at the same time to re-assemble in arbitrary sequences with different combinations. The versatility,
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30

Waage, Magnus Heskestad. "Radiative corrections to van der Waals interaction in fluids." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18872.

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The van der Waals interaction energy is derived for a homogenous fluid of polarizable particles. Low-temperature corrections to the van der Waals interaction energy are computed numerically for three cases: Dilute media with radiative interactions, arbitrarily dense media without radiative interactions, and arbitrarily dense media with radiative interactions. The validity of the model used to calculate the corrections at arbitrary densities is argued for, by comparison with the results for low densities.
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31

DelRio, Frank William. "Van der Waals and capillary adhesion in microelectromechanical systems." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3239374.

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32

Peet, Andrew Charles. "Vibrational predissociation of Van der Waals complexes containing ethylene." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329168.

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33

Howson, Joanna M. M. "Obtaining potential energy surfaces of Van der Waals molecules." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4488/.

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Two different methods were used to obtain a potential energy surface for the Arco molecule. One involved choosing a functional form for the repulsion and dispersion energies whose parameters were determined by a fit to experimental data. A physically justified potential that agreed with experiment could not be obtained. The other method was based on calculating ab initio interaction energies at different configurations of the molecule and interpolating between them. The resulting surface was scaled in the energy and the co-ordinates. Improved agreement was achieved for most observed bound stat
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34

Sanz-Garcia, Aranzazu. "Modelling the dispersion energy for Van der Waals complexes." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252013.

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35

Musgrave, Adam. "Electronic spectroscopy of Van der Waals clusters and complexes." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445684.

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36

Khestanova, Ekaterina. "Van der Waals heterostructures : fabrication, mechanical and electronic properties." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/van-der-waals-heterostructures-fabrication-mechanical-and-electronic-properties(047ce24b-7a58-4192-845d-54c7506f179f).html.

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The fast progress in the exploration of 2D materials such as graphene became possible due to development of fabrication techniques that allowed these materials to be protected from e.g. undesirable doping and gave rise to new functionalities realized within van der Waals heterostructures. Attracted by van der Waals interaction the constituent layers of such heterostructures preserve their exceptional electronic quality and for example in graphene allow for high electron mobility to be achieved. However, the studies of atomically thin layers such as NbSe2 that exhibit metallic behavior have bee
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37

Schofield, Robert Christopher. "Raman studies of 2-dimensional van der Waals materials." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/21313/.

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Presented herein are results of optical studies with emphasis on the Raman response, providing significant contribution to the knowledge of the field. In Mox W(1−x) S2 , confirmation of the behaviour of the excitonic properties is made. Raman measurements performed in this system allow investigation with unprecedented resolution, highlighting deviations in the high frequency A1g optical phonon mode from theoretical predictions, and previous experimental studies. In the low frequency, data confirms the trends in the shear and breathing interlayer modes in alloys between WS2 and MoS2 are well de
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38

David, Lamuel Abraham. "Van der Waals sheets for rechargeable metal-ion batteries." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/32796.

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Doctor of Philosophy<br>Department of Mechanical and Nuclear Engineering<br>Gurpreet Singh<br>The inevitable depletion of fossil fuels and related environmental issues has led to exploration of alternative energy sources and storage technologies. Among various energy storage technologies, rechargeable metal-ion batteries (MIB) are at the forefront. One dominant factor affecting the performance of MIB is the choice of electrode material. This thesis reports synthesis of paper like electrodes composed for three representative layered materials (van der Waals sheets) namely reduced graphene oxide
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39

Gée, Christelle. "Reactions chimiques isolees sur agregats de van der waals." Paris 11, 1997. http://www.theses.fr/1997PA112092.

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Cette these porte sur l'etude des collisions reactives ou non reactives en presence d'un milieu materiel: un agregat forme de plusieurs centaines d'atomes ou molecules. L'agregat par sa taille finie permet d'isoler un couple de reactifs qui peuvent migrer sur l'agregat, entrer en collision et eventuellement declencher une reaction chimique. Notre dispositif experimental permet de generer un faisceau d'agregats homogenes (d'argon, de methane et d'azote) et d'y deposer les reactifs en faible quantite, par une technique collisionnelle. Nous etudions ces reactions chimiques isolees a la fois par d
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40

Yu, Geliang. "Transport properties of graphene based van der Waals heterostructures." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/transport-properties-of-graphene-based-van-der-waals-heterostructures(5cbb782f-4d49-42da-a05e-15b26606e263).html.

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In the past few years, led by graphene, a large variety of two dimensional (2D) materials have been discovered to exhibit astonishing properties. By assembling 2D materials with different designs, we are able to construct novel artificial van der Waals (vdW) heterostructures to explore new fundamental physics and potential applications for future technology. This thesis describes several novel vdW heterostructures and their fundamental properties. At the beginning, the basic properties of some 2D materials and assembled vdW heterostructures are introduced, together with the fabrication procedu
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41

Gani, Yohanes Satrio. "Electronic Properties of Two-Dimensional Van Der Waals Systems." W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1563899012.

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In this dissertation we study the electronic structure of van der Waals systems. A van der Waals systems is a heterostructure in which the different constituents are held together by van der Waals forces. We study two different types of van der Waals systems: van der Waals systems formed by graphene and a monolayer of NbSe2, van der Waals systems obtained by placing graphene nanoribbons on a two-dimensional crystal. For the first type of systems we build a continuous low-energy effective model that takes into account the presence of a twist angle between graphene and NbSe2, and of spin-orbit c
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42

Tomarken, Spencer Louis. "Thermodynamic and tunneling measurements of van der Waals heterostructures." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123567.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 201-212).<br>In certain electronic systems, strong Coulomb interactions between electrons can favor novel electronic phases that are difficult to anticipate theoretically. Accessing fundamental quantities such as the density of states in these platforms is crucial to their analysis. In this thesis, I explore the application of two measurement techniques towards this goal: capacitance measurements that probe the thermodynamic g
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43

Henck, Hugo. "Hétérostructures de van der Waals à base de Nitrure." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS319/document.

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Le sujet de cette thèse est à l’interface entre l’étude de composés à base de nitrure et des structures émergeantes formées par les matériaux bidimensionnels (2D) d’épaisseur atomique. Ce travail se consacre sur l’hybridation des propriétés électriques et optiques des semi-conducteurs à larges bandes interdites que sont les nitrures et des performances mécaniques, électriques et optiques des matériaux lamellaires, récemment isolé à l’échelle d’un plan atomique, qui sont aujourd’hui considérées avec attention aux regards de futures applications et d’études plus fondamentales. En particulier, un
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44

Scheele, Iris. "Hochauflösende Infrarot-Spektroskopie an schwach gebundenen Van-der-Waals-Systemen." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963558668.

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45

Quayle, Christopher John Kendrick. "Alignment effects in the photodissociation of van der Waals molecules." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357431.

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46

Luo, Yuanhong Ph D. Massachusetts Institute of Technology. "Twist angle physics in graphene based van der Waals heterostructures." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119050.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2018.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged student-submitted from PDF version of thesis.<br>Includes bibliographical references (pages 121-131).<br>In this thesis, I present my experimental work on twisted bilayer graphene, a van der Waals heterostructure consisting of two graphene sheets stack on top of each other. In particular, the twist angle is a new degree of freedom in this system, and
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47

Yankowitz, Matthew Abraham. "Local Probe Spectroscopy of Two-Dimensional van der Waals Heterostructures." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/594649.

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A large family of materials, collectively known as "van der Waals materials," have attracted enormous research attention over the past decade following the realization that they could be isolated into individual crystalline monolayers, with charge carriers behaving effectively two-dimensionally. More recently, an even larger class of composite materials has been realized, made possible by combining the isolated atomic layers of different materials into "van der Waals heterostructures," which can exhibit electronic and optical behaviors not observed in the parent materials alone. This thesis de
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48

Matope, Stephen. "Application of Van-der-Waals forces in micro-material handling." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71608.

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Thesis (PhD)--Stellenbosch University, 2012.<br>This doctoral dissertation focuses on the application of Van-der-Waals’ forces in micromaterial handling. A micro-material handling system consists of four main elements, which include: the micro-gripper, the micro-workpart, the picking up position and the placement position. The scientific theoretical frameworks of Van-der-Waals’ forces, presented by Van der Waals, Hamaker, London, Lifshitz, Israelachvilli, Parsegian, Rumpf and Rabinovich, are employed in exploring the extent to which these forces could be applied in a micromanufacturing s
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49

Economides, George. "Investigations of open-shell open-shell Van der Waals complexes." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:e27330e0-2eaa-4181-af30-70e8b7a3a692.

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The question posed in this work is how one would model and predict the rotational spectrum of open-shell open-shell van der Waals complexes. There are two secondary questions that arise: the nature of radical-radical interactions in such systems and the modelling of the large amplitude motion of the constituent molecules. Four different systems were studied in this work, each providing part of the answer to the main question. Starting with the large amplitude motion, there are two theoretical approaches that may be adopted: to either model the whole complex as a semi-rigid molecule, or to perf
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50

Dhont, Guillaume. "Spectroscopie Renner-Teller dans des complexes van der Waals chargés." Université de Marne-la-Vallée, 2003. http://www.theses.fr/2003MARN0175.

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Les complexes de van der Waals formés d'une diatomique à couche ouverte et d'un atome de gaz rare offrent une diversité de types de liaison et de dynamique bien plus large que les complexes à couche fermée. Pour les diatomiques dans un état électronique à moment angulaire non nul, la situation se complique par l'effet Renner-Teller qui nécessite de prendre en compte simultanément deux fonctions d'énergie potentielle. Les hamiltoniens permettant l'étude quantique de ces systèmes sont présentés dans deux systèmes d'axes liés à la molécule. Chaque orientation du repère possède un modèle sous-jace
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