Relevant bibliographies by topics / Graphene-based detector

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Academic literature on the topic 'Graphene-based detector'

Author: Grafiati
Published: 9 March 2023

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Journal articles on the topic "Graphene-based detector"

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Maksimenko, S. A., A. Maffucci, M. E. Portnoi, V. A. Saroka, and G. Y. Slepyan. "Middle- and far-infrared detector based on the plane collection of graphene strips." Doklady of the National Academy of Sciences of Belarus 65, no. 6 (2021): 661–67. http://dx.doi.org/10.29235/1561-8323-2021-65-6-661-667.

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A concept of a middle- and far-infrared detector has been proposed. The detector is built as a planar collection of parallel graphene strips of different length and width. The feature of the detector scheme is the concurrent utilization of two different detection mechanisms: excitation in the given frequency range of low-frequency interband transitions inherent in armchair graphene strips and antenna resonances of strongly slowed-down surface waves (plasmon polaritons). It has been shown that matching these two resonances results in the essential detector signal amplification, thus providing an alternative way how to solve the problem of the low efficiency of resonant graphene antennas. An approach is proposed to analyze the design of such detectors, as well as to discuss the ways of tuning the both mechanisms.
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Mittendorff, Martin, Stephan Winnerl, Josef Kamann, et al. "Ultrafast graphene-based broadband THz detector." Applied Physics Letters 103, no. 2 (2013): 021113. http://dx.doi.org/10.1063/1.4813621.

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Warbinek, J., D. Leimbach, D. Lu, et al. "A graphene-based neutral particle detector." Applied Physics Letters 114, no. 6 (2019): 061902. http://dx.doi.org/10.1063/1.5080517.

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Gazaliev, A. Sh, M. V. Moskotin, V. V. Belosevich, M. G. Rybin, I. A. Gayduchenko, and G. N. Goltsman. "Graphene two terminal detector as THz mixer." Journal of Physics: Conference Series 2086, no. 1 (2021): 012054. http://dx.doi.org/10.1088/1742-6596/2086/1/012054.

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Abstract The growing requirements for mobile communication networks (data transfer rates over 100 Gbps) makes it necessary to use carrier signal with a frequency of at least 100 GHz. This requires the development of cheap and broadband sub-terahertz (sub-THz) detectors. Here we report on our recent efforts toward the development of a heterodyne sub-THz detector based on a single layer graphene two-terminal device integrated with a bowtie antenna on a sapphire substrate. Our detector operates at frequency of 140 GHz, which corresponds to the maximum transmission of THz radiation in the Earth’s atmosphere. The heterodyne detection is achieved by quasi-optical coupling of signals from two sub-THz radiation sources to the same detector. The measured frequency bandwidth is 5.8 GHz.
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Anderson, Travis J., Karl D. Hobart, Jordan D. Greenlee, et al. "Ultraviolet detector based on graphene/SiC heterojunction." Applied Physics Express 8, no. 4 (2015): 041301. http://dx.doi.org/10.7567/apex.8.041301.

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Zhai, Yuan, Yi Xiang, Weiqing Yuan, et al. "Fabrication of Graphene Nanomesh FET Terahertz Detector." Micromachines 12, no. 6 (2021): 641. http://dx.doi.org/10.3390/mi12060641.

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High sensitivity detection of terahertz waves can be achieved with a graphene nanomesh as grating to improve the coupling efficiency of the incident terahertz waves and using a graphene nanostructure energy gap to enhance the excitation of plasmon. Herein, the fabrication process of the FET THz detector based on the rectangular GNM (r-GNM) is designed, and the THz detector is developed, including the CVD growth and the wet-process transfer of high quality monolayer graphene films, preparation of r-GNM by electron-beam lithography and oxygen plasma etching, and the fabrication of the gate electrodes on the Si3N4 dielectric layer. The problem that the conductive metal is easy to peel off during the fabrication process of the GNM THz device is mainly discussed. The photoelectric performance of the detector was tested at room temperature. The experimental results show that the sensitivity of the detector is 2.5 A/W (@ 3 THz) at room temperature.
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Yin, Yiheng, Yanxiong Niu, Haiyang Xie, et al. "Terahertz detector based on multi-layer graphene nanoribbons." European Physical Journal Applied Physics 79, no. 1 (2017): 10301. http://dx.doi.org/10.1051/epjap/2017160440.

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Kumar, Ashish, Arathy Varghese, and Vijay Janyani. "Fabrication of graphene–ZnO heterostructure-based flexible and thin platform-based UV detector." Journal of Materials Science: Materials in Electronics 33, no. 7 (2021): 3880–90. http://dx.doi.org/10.1007/s10854-021-07578-8.

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AbstractThis work presents the performance evaluation of Graphene/ZnO Schottky junctions grown on flexible indium tin oxide (ITO)-coated polyethylene terephthalate (PET) substrates. The fabricated structures include chemical vapour deposition grown graphene layer on ITO-coated PET substrates. Polymethyl methacrylate assisted transfer method has been employed for the successful transfer of graphene from Cu substrate to PET. The smaller D-band intensity (1350 cm−1) compared to G-band (1580 cm−1) indicates good quality of carbon lattice with less number of defects. High-quality ZnO has been deposited through RF sputtering. The deposited ZnO with grain size 50–95 nm exhibited dislocation densities of 1.31270 × 10–3 nm−2 and compressive nature with negative strain of − 1.43156 GPa. Further, the electrical and optical characterization of the devices has been done through device I–V characterization and UV detection analysis. The UV detection capability of the device has been carried out with the aid of a UV-lamp of 365 nm wavelength. The fabricated graphene/ZnO photodetector showed good response to UV illumination. The device performance analysis has been done through a comparison of the device responsivity and detectivity with the existing detectors. The detectivity and responsivity of the fabricated detectors were 7.106 × 109 mHz1/2 W−1 and 0.49 A W−1, respectively.
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Yang, Fan, Wei Song, Chonglei Zhang, et al. "Broadband graphene-based photoacoustic microscopy with high sensitivity." Nanoscale 10, no. 18 (2018): 8606–14. http://dx.doi.org/10.1039/c7nr09319e.

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Zhang, Jianzhi, Hongfu Huang, Junhao Peng, et al. "A Cost-Effective Long-Wave Infrared Detector Material Based on Graphene@PtSe2/HfSe2 Bidirectional Heterostructure: A First-Principles Study." Crystals 12, no. 9 (2022): 1244. http://dx.doi.org/10.3390/cryst12091244.

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The Graphene@PtSe2 heterostructure is an excellent long-wave infrared detection material. However, the expensive cost of PtSe2 prevents its widespread use in infrared detection. In this paper, Hf was used to partially replace Pt to form Graphene@(PtSe2)n(HfSe2)4−n (n = 1, 2, and 3) bidirectional heterostructures consisting of graphene and lateral PtSe2/HfSe2 composites based on first-principles calculations. Then, the new bidirectional heterostructures were compared with heterostructures formed by graphene with pure MSe2 (M = Pt, Hf). It was found that the band gaps of the bidirectional heterostructures were between those of Graphene@PtSe2 and Graphene@HfSe2. Among these heterostructures, the Graphene@(PtSe2)3(HfSe2)1 bidirectional heterostructure has almost the same optical absorption properties in the infrared wavelength region of 1.33~40 µm as the Graphene@PtSe2 heterostructure, and it improves the absorption in the near-infrared wavelength region of 0.75~1.33 µm. Such a designment may bring the material costs down (since PtSe2 costs approximately five times more than HfSe2). This study on the designment of the bidirectional Graphene@(PtSe2)3(HfSe2)1 heterostructure also illustrates a cost-effective design method for Pt-based IR detectors.
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Dissertations / Theses on the topic "Graphene-based detector"

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Willemse, Chandre Monique. "Nanocomposite-graphene based platform for heavy metal detection." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8123_1323852117.

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This study reports the synthesis of graphene by oxidizing graphite to graphite oxide using H2SO4 and KMnO4 and reducing graphene oxide to graphene by using NaBH4. Graphene was then characterized using FT-IR, TEM, AFM, XRD, Raman spectroscopy and solid state NMR. Nafion-Graphene in combination with a mercury film electrode, bismuth film electrode and antimony film electrode was used as a sensing platform for trace metal analysis in 0.1 M acetate buffer (pH 4.6) at 120 s deposition time, using square-wave anodic stripping voltammetry (SWASV). Detection limits were calculated using 3σblank/slope. For practical applications recovery studies was done by spiking test samples with known concentrations of metal ions and comparing the results to inductively coupled plasma mass spectrometry (ICPMS). This was then followed by real sample analyses.
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Rodriguez-Silva, Allen A. "Graphene Oxide-based Novel Supercapacitor Immunosensors for Physiological Biomarkers Detection." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1458922749.

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Xiao, Long. "Room-temperature terahertz detection based on graphene and plasmonic antenna arrays." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274565.

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Terahertz (THz) radiation has become increasingly important in many scientific and commercial fields in recent years. It possesses many remarkable features resulting in an increased use of THz radiation for various applications, like biomedical imaging, security screening, and industrial quality control. The capability of these applications depends directly on the availability of powerful THz sources and high-responsivity, fast THz detectors. Current commercial products used to detect THz radiation, like Golay cells and pyroelectric detectors, have only slow detection rates and poor sensitivities. Other commercial THz detectors, like bolometers, are more sensitive but require liquid helium cooling. In this thesis, two types of room-temperature high-responsivity graphene-based THz detectors are presented, relying on the unique properties of graphene and the function of plasmonic antenna arrays which boost the interaction between THz waves and graphene. Graphene has been demonstrated as a promising material for THz detection. However, the challenge is its insufficient light absorption that largely limits the responsivity. The first design is based on an array of planar antennas arranged in series and shorted by graphene squares. Highly efficient photodetection can be achieved by using the metallic antenna to simultaneously improve both light absorption, as resonant elements, and photocarrier collection, as electrodes. The device has been characterized with quantum cascade lasers, yielding a maximum responsivity of ~2 mA/W at 2 THz. The second detector is based on an array of interdigitated bow-tie antennas connected in parallel and shunted by graphene squares. The arms of the bow-tie antennas were made of two metals with different work functions to create a built-in electric field and improve the responsivity. The device has been characterized and yields a maximum responsivity of ∼34 μA/W at 2 THz. Efficient THz imaging is presented by integrating the detector in a QCL-based THz imaging system.
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Morelli, Laura. "Study of graphene-based gas sensors functionalized with gold nanoparticles for NO2 detection." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17577/.

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Obiettivo della tesi è la ricerca di un metodo volto a migliorare le attuali prestazioni dei sensori di gas realizzati in grafene. Negli ultimi anni il grafene ha attirato particolare attenzione nel campo dei sensori di gas. Tuttavia, l’utilizzo del grafene presenta limitazioni che rendono difficile lo sviluppo di sensori utilizzabili commercialmente. Tra queste, la mancanza di selettività, nonché la difficoltà del segnale a raggiungere la saturazione e a ritornare al livello iniziale durante la fase di ripristino, rappresentano i maggiori ostacoli. La funzionalizzazione del grafene risulta essere tra i metodi più promettenti per rimediare alle predette limitazioni. Nella tesi, l’oggetto della ricerca è un resistore chimico, il cui materiale sensibile è costituito da grafene multi-strato realizzato tramite deposizione chimica da fase vapore. Il processo di funzionalizzazione scelto si basa sulla deposizione di nanoparticelle di oro sulla superficie del grafene multi-strato. Le caratteristiche fisiche ed elettriche del materiale e le prestazioni del sensore vengono analizzate e confrontate prima e dopo il processo di funzionalizzazione. In particolare, la tesi sviluppa i seguenti punti: Nel Capitolo 1 vengono introdotte le caratteristiche fisiche ed elettriche del grafene, e le sue potenzialità nelle applicazioni di tipo "gas-sensing". Nel Capitolo 2 viene presentato lo stato dell’arte sul processo di funzionalizzazione. Il Capitolo 3 contiene le analisi delle caratteristiche fisiche ed elettriche del materiale, esaminando le differenze riscontrate dopo la funzionalizzazione. I risultati dei test su gas, prima e dopo la funzionalizzazione, sono presentati nel Capitolo 4. SI usa NO2 come "target gas", N2 come gas portante. Per alcuni test, una percentuale di umidità relativa viene aggiunta al flusso di gas. Infine, i risultati vengono confrontati e discussi in dettaglio.
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Ben, Aziza Zeineb. "Graphene based gas sensors : Fabrication, characterization, and study of gas molecules detection mechanism." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0102.

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Ce travail nous a permis de réaliser une étude de capteurs de gaz et d’humidité à base de graphène. Cette étude pourrait être utile non seulement pour améliorer les performances des capteurs à base de graphène mais aussi pour mieux comprendre l’interaction entre le graphène et les molécules de gaz. Ceci semble indispensable pour faire avancer les applications du graphène comme un matériau prometteur pour la détection des gaz. Des avancées significatives ont été présentées au niveau de la fabrication de ces capteurs, leurs différentes caractérisations électriques ainsi que d’autres techniques employées pour analyser le mécanisme contrôlant la détection des molécules de gaz/vapeur. Ces outils ont été mis en place pour concevoir et fabriquer plusieurs structures de capteur en utilisant différents substrats support du graphène d’une part et en modifiant les propriétés du graphène par utilisation des produits chimiques d’autres part. La caractérisation de ces capteurs sous différents environnements a permis de comparer les différentes réponses des capteurs et d’en tirer plusieurs conclusions sur le fonctionnement de ces dispositifs. En effet, le Mica, un substrat lisse et transparent, a été utilisé comme substrat pour le graphène. Le dopage induit par le mica a été étudié ainsi que son impact sur la sensibilité du graphène au gaz d’ammoniac. Ceci a permis de mettre en évidence le fait que le substrat joue un rôle important pour la détection de l’ammoniac. De plus, ces capteurs fabriques sur mica et SiO2 ont été testés sous différentes conditions de températures et d’oxygène. Dans une autre approche, un polymère a été utilisé pour doper le graphène. Une étude détaillée a été menée pour analyser le comportement de ce graphène fonctionnalisé par rapport aux molécules d’eau. Ces nouveaux résultats expérimentaux obtenus pendant cette thèse constituent un bon support à plusieurs résultats théoriques établis et permettent d’optimiser la conception des capteurs de gaz à base de graphène pour des meilleures performances<br>In this research, we report on a study of graphene based gas and humidity sensors. This study could be useful not only to improve the performance of graphene based sensors but also to better understand the interaction between graphene and gas molecules. This seems necessary to promote the applications of graphene as a promising material for gas sensing. Significant advances have been made to design and fabricate these sensors: the different electrical characterizations as well as other techniques used to analyze the mechanism controlling the detection of gas/vapor molecules. These tools have been set up to design and manufacture various sensor structures using different underlying substrates for graphene on one hand and chemical modification of graphene properties on the other hand. The characterization of these sensors under different environments was used to compare the different responses of the sensors and draw several conclusions about gas sensing mechanism. Indeed, Mica, a smooth and transparent substrate, was used as a supporting substrate for graphene. Doping induced to graphene by mica and its impact on graphene sensitivity to ammonia gas were studied. This has made it possible to highlight the fact that the substrate plays an important role for the detection of ammonia. In addition, these sensors made on mica and SiO2 were tested under a variety of temperatures and oxygen. In another approach, a polymer was used to dope graphene. A detailed study was realized about the behavior of water molecules on functionalized graphene. The obtained experimental results, reported for the first time, represent a good support for several theoretical studies already made and could be used to optimize the design of graphene based gas sensors
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Hosu, Ioana Silvia. "Ultrasensitive detection of ricin-like proteins by innovative graphene-based sensors, using mass spectrometry." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1I008.

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Les attaques bioterroristes sont devenues plus fréquentes ces dernières années et le large éventail d’agents bioterroristes en fait un problème important à résoudre. La ricine appartient à la famille des protéines inactivant les ribosomes (RIP). Les RIP sont des toxines biologiques, solubles dans l’eau, qui peuvent être facilement extraites de plantes (ricine de Ricinus communis et abrine d’Abrus precatorius) ou de bactéries (toxine de Shiga). La ricine est composée de deux chaînes: la chaîne A de la ricine, une N-glycosidase induisant la toxicité par élimination de l’adénine (action de dépurination) de l’ARNr 28S des sous-unités ribosomales 60S, inhibant la synthèse protéique, et la chaîne B, une lectine qui se lie aux fragments de sucre spécifiques sur la membrane extracellulaire, assurant l'absorption de la toxine. Comme ils inhibent la synthèse des protéines, en fonction de la voie d'absorption et de la dose reçue, la mort peut survenir. En l'absence de contre-mesures efficaces, les méthodes de détection de ces toxines doivent être rapides, fiables, sélectives et sans aucune ambiguïté. Les méthodes actuelles qui sont principalement basées sur des méthodes comme le SERS, l’ELISA, la Colorimétrie et la SPR ne répondent pas à toutes ces exigences. Même si la spectrométrie de masse a été utilisée pour la détection de la ricine, elle ne peut pas être réalisée sans une longue et fastidieuse préparation d'échantillon. Dans ce travail, nous avons montré comment les matériaux à base de carbone (nanomurs de carbone) pourraient être appliqués comme matériaux nanostructurés pour la détection spécifique, rapide et simple de la ricine par désorption/ionisation laser de surface pour la détection par spectrométrie de masse (SALDI-MS). Tout d'abord, l'adéquation des nanoparticules de carbone en tant que bonne surface SALDI a été initialement étudiée pour des biomolécules plus petites. En ce qui concerne les protéines, la littérature a montré qu'elles sont difficiles à ioniser et à détecter avec la méthode SALD-MS, en raison de leur grand poids moléculaire. La capacité des CNWs à désorber et à ioniser les protéines a nécessité de nombreuses étapes d’optimisation. Pour ce faire, le cytochrome C a été utilisé comme protéine modèle. Enfin, des nanomurs de carbone alignés verticalement ont ensuite été modifiés à l'aide de sucres à lectine spécifiques (galactosamine), pour la détection spécifique de la chaîne B de la ricine dans des échantillons réels, tels que des boissons sans alcool et du sérum sanguin. Nous avons obtenu une limite de détection (80 ng/0.5 μL) soit trois fois inférieure à la dose létale médiane la plus faible (DL50 = 10 μg/kg). Cette détection peut être réalisée dans les 10 min. Dans la dernière partie, des résultats préliminaires concernant la mise au point d'outils analytiques bimodaux seront présentés. Il s'agit de combinaisons telles que: SPR (résonance plasmonique de surface)-MS, SERS (Spectroscopie Raman Exaltée de Surface)-MS et EC(Électrochimie)-MS. Une attention particulière a été portée sur la SPR-MS car elle permet d’obtenir des interactions quantitatives et moléculaires en temps réel (SPR) et une identification structurelle des analytes (MS). Les méthodes de dépôt suivantes (de matériaux de type graphène) sont avérées appropriées pour la détection des protéines: la méthode de surfactant à bulle d'oxyde de graphène, le transfert par voie humide de graphène CVD et le dépôt électrophorétique de graphène.Cette thèse décrit pour la première fois le développement d'un capteur de type SALDI-MS, capable de détecter la ricine à une dose inférieure à la dose mortelle chez l'homme et d'apporter ainsi une contribution importante à la lutte contre d'éventuelles attaques terroristes. L'étude systématique de différents paramètres qui influencent ce processus LDI-MS est également présenté. Les techniques bimodales présentent des alternatives intéressantes permettant de créer des outils analytiques plus puissants<br>Bio-terroristic attacks have become more frequent in the past years and the wide range of bio-terroristic agents makes this an important issue to overcome. Ricin is part of the ribosome-inactivating proteins (RIP). RIPs are vegetable toxins, water soluble, which can be easily extracted from plants (ricin from castor beams, abrin from rosary pea) or from bacteria (Shiga toxin). These proteins are composed of two chains: ricin A chain, a glycosidase that insures the toxicity by removal of adenine (depurination) from the RNAr 28S from the 60S ribosomal subunits, followed by the inhibition of protein synthesis, and ricin B chain, a lectin that binds to specific sugar moieties on the surface of the cells, assuring transportation the cell uptake. As they inhibit protein synthesis, depending of the administration take-up (oral, inhalation, intravenously) and the dose received, cell death also occurs. In the absence of efficient counter measurements, detection methods of these toxins have to be fast, reliable, selective and suitable, especially pre-assimilation analysis. The current methods (based on SERS, ELISA, Colorimetric, SPR and MS) do not overcome all these requirements. Even though mass spectrometry was used for ricin detection, it cannot be performed without long and tedious sample preparation. In this work, we describe how carbon-based materials (carbon nanowalls and others) can be used as nanostructured materials for specific, rapid and straightforward ricin-like proteins detection, using surface assisted laser/desorption ionization mass spectrometry (SALDI-MS). The suitability of the carbon nanowalls (CNWS) was proven initially for other smaller bio-molecules.When it comes to proteins, they are hard to ionize and detect using SALD-MS, due in part to their big molecular weight. The ability of CNWs to desorb and ionize proteins required a lot of optimization steps of the SALDI-MS method. A systematic optimization was done using a model protein, the cytochrome C. From this, we were able, for the first time, to detect Ricin B chain without the use of organic matrix. To go further in improving Ricin detection performances, carbon nanowalls were then covalently modified using specific lectin sugars (galactosamine) and the ability to detect Ricin B chain in real samples such as soft drinks and blood serum was demonstrated within10 minutes. We obtained a limit of detection (80 ng/0.5 μL) that is 3 times lower than the lowest median lethal dose (LD50 = 10 μg/kg) Multifunctional surfaces are described as perspectives for more powerful bimodal analytical tools, by combining two techniques, such as: SPR(Surface Plasmon Resonance)/SALDI-MS, SERS(Surface Enhanced Raman Spectroscopy)/SALDI-MS and EC(Electrochemistry)/SALDI-MS. Special attention was focused on SPR/SALDI-MS as it can achieve both quantitative and molecular interactions in real-time (SPR) and precise identification of the analytes (MS). Different depositions methods of graphene-like materials were studied to ensure a good surface coverage of the substrate and the followings methods were suitable for protein detection: bubble surfactant method of graphene oxide, wet transfer of CVD pristine graphene, electrophoretic deposition of graphene.In this thesis, we described the first world wide ricin-like proteins SALDI-MS sensor, which is able to detect below the lethal dose in humans and bring an important contribution to the fight against eventual terroristic attacks. The systematic study of different parameters that influence this LDI-MS process is also presented. The dual surfaces studied, in particular the SPR/MS bimodal techniques, presented reliable consistency for further approaches in creating more powerful analytical tools
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Ma, Xiaofan. "The use of graphene quantum dots as detection elements in nanomaterials-based sensors for forensic applications." Thesis, KTH, Tillämpad fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298092.

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The large-scale abuse and addiction of narcotics such as amphetamine and cocaine have become a global problem. In this project, we innovatively use graphene quantum dots (GQDs) as a fluorescent sensor to detect and quantify amphetamine and cocaine. This technology will have broad forensic application prospects. Compared with metallic quantum dots, graphene quantum dots are green and safe, with excellent bio-compatibility and low toxicity. We used undoped and N-doped GQDs as fluorescent sensing probes for the detection of amphetamine and cocaine, respectively. Using FTIR and FL as characterization methods, the fluorescence luminescence of GQDs under multiple excitation wavelength bands was studied and compared with the fluorescence after adding drugs. The experimental results show that the N-doped GQDs has a higher response to the binding substance. The detection concentration of amphetamine ranges from 5 µM to 5 mM, and the detection concentration of cocaine ranges from 10 µM-10 mM. Within this range, the fluorescence peak intensity ratio and the drug concentration have a two-stage linear negative correlation.<br>Storskaligt missbruk och missbruk av narkotika som amfetamin och kokain har blivit ett globalt problem. I detta projekt använder vi innovativt grafenkvantprickar (GQDs) som en fluorescerande sensor för att detektera och kvantifiera amfetamin och kokain. Denna teknik kommer att ha breda rättsmedicinska applikationsmöjligheter. Jämfört med traditionella kvantprickar är grafenkvantprickar gröna och säkra, med utmärkt biokompatibilitet och låg toxicitet. Vi använde odopade och N-dopade GQD: er som fluorescerande avkännande sonder för detektion av amfetamin respektive kokain. Med användning av FTIR och FL som karakteriseringsmetoder studerades fluorescens luminiscens hos GQD under flera exciteringsvåglängdsband och jämfördes med fluorescensen efter tillsats av läkemedel. De experimentella resultaten visar att den N-dopade GQD har ett högre svar på den bindande substansen. Detekteringskoncentrationen av amfetamin sträcker sig från 5 µM till 5 mM, och detektionskoncentrationen av kokain varierar från 10 µM-10 mM. Inom detta område har fluorescens toppintensitetsförhållandet och läkemedelskoncentrationen en tvåstegs linjär negativ korrelation.
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Ha, Dat Thinh. "Developing a New Sensing Technology for Double-Stranded DNA Detection Utilizing Engineered Zinc Finger Proteins and Nanomaterials." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/3079.

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A specific double-stranded DNA sensing system is of great interest for diagnostic and other biomedical applications. Zinc finger domains, which recognize double-stranded DNA, can be engineered to form custom DNA-binding proteins for recognition of specific DNA sequences. As a proof of concept, a sequence-enabled reassembly of TEM-1 β- lactamase system (SEER-LAC) was previously demonstrated to develop zinc finger protein (ZFP) arrays for the detection of a double-stranded bacterial DNA sequence. Here, we implemented the SEER-LAC system to demonstrate the direct detection of pathogenspecific DNA sequences present in E. coli O157:H7 on the lab-on-a chip. ZFPs customdesigned to detect shiga toxin in E. coli O157:H7 were immobilized on the cyclic olefin copolymer (COC) chip, which can function as a non-PCR based molecular diagnostic. Pathogen-specific double-stranded DNA was directly detected by engineered ZFPs immobilized on the COC chip, providing a detection limit of 10 fmole of target DNA in colorimetric assay. Therefore, in this study, we demonstrated a great potential of ZFP arrays on the COC chip for further development of a simple and novel lab-on-a chip technology for detection of pathogens. Antibiotic resistance is a serious, and rapidly growing global threat. Here, we designed a novel screening method to detect antibiotic resistance genes (ARGs) in bacteria using a graphene oxide-based biosensor utilizing engineered ZFPs. Two-dimensional graphene oxide (GO) sheet possesses unique electronic, thermal, and mechanical properties. The quenching ability of GO can create novel methods for detection of biomolecules. Our approach utilizes quenching of fluorescence signal by GO in the absence of target ARGs, but restoring the signal in the presence of target ARGs. Quantum dot (QD)- labeled ZFP can bind to GO via stacking interactions of aromatic and hydrophobic residues in conjunction with hydrogen bonding interaction between hydroxyl or carboxyl groups of GO and hydroxyl or amine groups of the protein. Due to fluorescence resonance energy transfer (FRET) between QD and GO when they are in close proximity, fluorescence signal of QD-labeled ZFP is expected to be quenched. In the presence of target DNA, the bound DNA-protein complex is released from GO, restoring the fluorescence signal.
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Pokpas, Keagan William. "Microfluidic graphenised-paper electroanalytical devices (μGPED) for adsorptive cathodic stripping voltammetric detection of metal contaminants". University of the Western Cape, 2017. http://hdl.handle.net/11394/5506.

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Philosophiae Doctor - PhD<br>The need for clean, non-toxic drinking water supplies, free of pollutants and metal contamination is vital in impoverished areas and the developing world alike. With this in mind, the development of accurate, inexpensive, portable and simple devices for remote sensing applications is therefore pivotal for early detection and the prevention of illnesses. Over the last two decades, adsorptive stripping voltammetry (AdSV) has emerged as a superior detection method over common analytical techniques due to its low-cost instrumentation, unskilled labour and ability to detect a wide range of analytes.<br>2020-08-31
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Medhat, Abdel Maksoud Dina. "Study of New Miniaturized Microwave Devices based on Ratchet Effect in an Environment of Asymmetric Nano-Scatterers." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0075/document.

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La nanotechnologie est un domaine en voie d'expansion qui a attiré l'attention de la recherche en raison de ses applications potentielles illimitées. La technologie des ondes millimétriques est un autre domaine intéressant qui joue un rôle de premier plan dans le développement des systèmes de communications sans fil. La combinaison de ces deux champs de recherche avancée, donne naissance à l'innovation du Dispositif Ratchet qui est une nouvelle application qui représente un vrai défi. Ce dispositif est de taille nanométrique et son concept d'opération consiste à générer une tension DC lorsque le dispositif, basé sur le gaz d'électron bidimensionnel, est rayonné par l'énergie des micro-ondes. L'objectif de cette thèse est d'essayer d'améliorer la réponse du dispositif, ce qui ouvre de nouvelles perspectives dans la fabrication des détecteurs de champ à haute fréquence et à l'échelle nanométrique. Malheureusement, les Dispositifs Ratchet actuels, basés sur des hétérostructures de semiconducteurs, réalisés jusqu'à présent fonctionnent à basse température pour assurer une grande mobilité électronique. Cette condition nécessite l'utilisation d'un setup expérimental complexe qui a un grand impact sur la tension induite et sur la reproductibilité du phénomène Ratchet observé. Dans ce contexte, le travail effectué dans le cadre de cette thèse a abordé ce problème en deux parties. La première partie concerne l'analyse électromagnétique du setup expérimental. Ceci a été réalisé par la mise en oeuvre des simulations électromagnétiques intenses. D'autre part, différentes solutions ont été proposées afin d'optimiser le setup et ainsi améliorer la tension Ratchet produite. Outre l'étude électromagnétique, certaines mesures de modulation ont été réalisées pour tester la faisabilité du Dispositif Ratchet comme un démodulateur d'amplitude. La deuxième partie de cette thèse traite l'étude de la matière qui compose le Dispositif Ratchet. Récemment, le graphène commence à envahir le monde scientifique et technologique avec ses fascinantes propriétés électroniques, tels que sa mobilité d'électrons élevée à température ambiante, où les matériaux conventionnels sont en train de confronter des obstacles. En conséquence, l'idée de fabriquer un Dispositif Ratchet à base de graphène au lieu des hétérojonctions de semiconducteurs, a été introduite. Plusieurs modèles de conception, caractérisation et mesures RF ont été accomplis en vue d'obtenir un Dispositif Ratchet fiable approprié pour de nombreuses applications pratiques à la température ambiante, dans la gamme de fréquences micro-ondes et pourraient s'étendre à la bande térahertz<br>Nanotechnology is a growing field that has attracted significant research attention due to its unlimited potential applications. Millimeter wave technology is another interesting field that plays a leading role in the development of wireless communications systems. Combining these two advanced research fields together, has given rise to the innovation of the Ratchet Device which is now a new challenging application. This device has a nanoscale size and its concept of operation consists of generating a DC voltage when radiating a two-dimensional electron gas based device with microwave energy. The aim of this thesis is in trying to improve the device response and hence opening new perspectives in the fabrication of high frequency field detectors on the nanoscale level. Unfortunately, the current Ratchet Devices, based on semiconductor heterostructures, realized till now, operate at low temperatures to ensure high electron mobility. This condition necessitates the use of a complex experimental setup that has a great impact on the induced voltage and on the reproducibility of the observed Ratchet phenomenon. In this context, the work performed within the framework of this thesis has addressed this problem in two parts. The first part concerns the electromagnetic analysis of the experimental setup behavior. This has been achieved by implementing intensive full wave electromagnetic simulations. Different solutions have been proposed to optimize the setup and thus enhance the Ratchet voltage produced. In addition to the electromagnetic study, some modulation measurements have been performed to test the feasibility of the Ratchet Device as an amplitude demodulator. The second part of this thesis deals with the study of the material composing the Ratchet Device. Recently, graphene has started to invade the scientific and the technological world with its fascinating electronic properties, such as its high electron mobility at room temperature, which distinguishes it from conventional materials that typically collide with obstacles. As a result, the idea of fabricating a Ratchet Device based on graphene instead of semiconductor heterojunctions has been introduced. Several design models, characterizations and RF measurements have been performed in order to obtain a reliable Ratchet Device suitable for many practical applications at room temperature. This has been done in the microwave frequency range and can also extend to the terahertz band
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Books on the topic "Graphene-based detector"

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Mitin, Vladimir, Victor Ryzhii, and Taiichi Otsuji. Graphene-Based Terahertz Electronics and Plasmonics: Detector and Emitter Concepts. Jenny Stanford Publishing, 2020.

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Graphene-Based Terahertz Electronics and Plasmonics: Detector and Emitter Concepts. Jenny Stanford Publishing, 2020.

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Mitin, Vladimir, Victor Ryzhii, and Taiichi Otsuji. Graphene-Based Terahertz Electronics and Plasmonics: Detector and Emitter Concepts. Jenny Stanford Publishing, 2020.

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Mitin, Vladimir, Victor Ryzhii, and Taiichi Otsuji. Graphene-Based Terahertz Electronics and Plasmonics: Detector and Emitter Concepts. Jenny Stanford Publishing, 2020.

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Pandikumar, Alagarsamy, and Perumal Rameshkumar. Graphene-Based Electrochemical Sensors for Biomolecules. Elsevier, 2018.

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Pandikumar, Alagarsamy, and Perumal Rameshkumar. Graphene-Based Electrochemical Sensors for Biomolecules. Elsevier, 2018.

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Toxic Gas Sensors and Biosensors. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901175.

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The book focuses on novel sensor materials and their environmental and healthcare applications, such as NO2 detection, toxic gas and biosensing, hydrazine determination, glucose sensing and the detection of toxins and pollutants on surfaces. Materials covered include catalytic nanomaterials, metal oxides, perovskites, zeolites, spinels, graphene-based gas sensors, CNT/Ni nanocomposites, glucose biosensors, single and multi-layered stacked MXenes, black phosphorus, transition metal dichalcogenides and P3OT thin films.
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Book chapters on the topic "Graphene-based detector"

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Safinowski, Marcin, Krzysztof Trzcinka, Cezary Dziekoński, et al. "Development of Graphene Based Leak Detector." In Recent Advances in Systems, Control and Information Technology. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48923-0_53.

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Wu, Yaojun, Ping Shuai, Hengbin Zhang, Qian Zhang, and Lingzhong Fu. "Study on the Transportation of Electrons in the Graphene-Based X-Ray Detector." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46632-2_53.

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Rogalski, Antoni. "Graphene-Based Detectors." In 2D Materials for Infrared and Terahertz Detectors. CRC Press, 2020. http://dx.doi.org/10.1201/9781003043751-6.

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Scardamaglia, Mattia, and Carla Bittencourt. "Graphene-Based Metal-Free Catalysis." In Nanoscale Materials for Warfare Agent Detection: Nanoscience for Security. Springer Netherlands, 2019. http://dx.doi.org/10.1007/978-94-024-1620-6_9.

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Bansal, Shonak, M. Muthukumar, and Sandeep Kumar. "Graphene/HgCdTe Heterojunction-Based IR Detectors." In Handbook of II-VI Semiconductor-Based Sensors and Radiation Detectors. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-20510-1_8.

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Kumar, Dinesh, and Rekha Sharma. "Graphene-Based Nanostructures as Plasmonic Nanosensors." In Plasmonic Nanosensors for Detection of Aqueous Toxic Metals. CRC Press, 2022. http://dx.doi.org/10.1201/9781003128281-6.

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Roy, Kallol. "Number Resolved Single Photon Detection." In Optoelectronic Properties of Graphene-Based van der Waals Hybrids. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-59627-9_10.

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Kováčová, Mária, Eva Špitalská, and Zdenko Špitálský. "Light-Activated Polymer Nanocomposites Doped with a New Type of Carbon Quantum Dots for Antibacterial Applications." In Urinary Stents. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04484-7_25.

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AbstractCarbon quantum dots (CQDs) are relatively new carbon allotrope. It triggered an investigation of new CQD research of synthesis, properties CQDs, and applications. CQDs are quasispherical carbon particles with a size less than 10 nm with crystalline sp2 cores of graphite and quantum effects. A subclass of CQDs are graphene quantum dots (GQDs), and they have a structure of one or several graphene layers with diameter &lt; 10 nm with higher crystallinity than CQDs. CQDs also play an important role in medicine. CQDs are used in intracellular ion detection, toxin detection, pathogen, vitamin, enzyme, protein, nucleic acid, and biological pH value determination. Despite the broad range of biomedical applications, we would like to focus on antibacterial properties of pure CQDs and their polymer composites. The antibacterial effect of CQDs is based on noninvasive photodynamic therapy (PDT). PDT can cause a specific biological response on the cellular or subcellular level, such as apoptosis, programmed death, or necrosis, a nonprogrammed pathway. CQDs are a very promising new antibacterial nanoparticles.
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Miramontes, Antonio. "The Feasibility of Graphene-Based Defense Applications: An Industry Perspective." In Nanoscale Materials for Warfare Agent Detection: Nanoscience for Security. Springer Netherlands, 2019. http://dx.doi.org/10.1007/978-94-024-1620-6_1.

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Yadav, Archana, Anil Kumar, and Preeta Sharan. "MonoLayer Graphene-Based Plasmonic Biosensor for Urine Glucose Detection." In Proceedings of Trends in Electronics and Health Informatics. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8826-3_39.

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Conference papers on the topic "Graphene-based detector"

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Song, Wei, Fan Yang, Chonglei Zhang, Hui Fang, Changjun Min, and Xiaocong Yuan. "Graphene-based ultrasonic detector for photoacoustic imaging." In Young Scientists Forum 2017, edited by Songlin Zhuang, Junhao Chu, and Jian-Wei Pan. SPIE, 2018. http://dx.doi.org/10.1117/12.2317598.

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Jumaah, Alaa Jabbar, Shihab Al-Daffaie, Thomas Kusserow, and Idelfonso Tafur Monroy. "High Performance Graphene-Based CW THz Photoconductive Detector." In 2020 45th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE, 2020. http://dx.doi.org/10.1109/irmmw-thz46771.2020.9370371.

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Foxe, M., C. Roecker, J. Boguski, et al. "Numerical model of graphene-based radiation detector response." In 2010 IEEE Nuclear Science Symposium and Medical Imaging Conference (2010 NSS/MIC). IEEE, 2010. http://dx.doi.org/10.1109/nssmic.2010.5873843.

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Peng, Yunhao, Ashrafuzzaman Bulbul, Seungbeom Noh, Shakir-ul Haque Khan, Kyeong Heon Kim, and Hanseup Kim. "A Graphene-Based Thermal Conductivity Detector for Low Power Gas Detection." In 2021 IEEE 34th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2021. http://dx.doi.org/10.1109/mems51782.2021.9375329.

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Li, Chuanxin. "Valley Polarizer and Detector upon a Graphene-based Junction." In 2022 IEEE International Conference on Advances in Electrical Engineering and Computer Applications (AEECA). IEEE, 2022. http://dx.doi.org/10.1109/aeeca55500.2022.9918966.

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Li, Yifan, Yating Zhang, Zhiliang Chen, et al. "Room-temperature broadband terahertz detector based on three-dimensional graphene." In Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, edited by Laurence P. Sadwick and Tianxin Yang. SPIE, 2020. http://dx.doi.org/10.1117/12.2545792.

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But, Dmytro B., Christophe Consejo, Dominique Coquillat, et al. "Millimeter and submillimeter range detector based on graphene ballistic rectifiers." In 2018 22nd International Microwave and Radar Conference (MIKON). IEEE, 2018. http://dx.doi.org/10.23919/mikon.2018.8405293.

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Kilic, Velat, and Jacob B. Khurgin. "Efficient Graphene Based Ultrafast Field Detector Using Very Slow Electronics." In CLEO: Applications and Technology. OSA, 2019. http://dx.doi.org/10.1364/cleo_at.2019.jtu2a.100.

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Maffucci, A., S. A. Maksimenko, M. E. Portnoi, V. A. Saroka, and G. Y. Slepyan. "A Graphene THz Detector based on Plasmon Resonances and Interband Transitions." In 2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2021. http://dx.doi.org/10.23919/ursigass51995.2021.9560421.

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He, Shengmei, Shuming Yang, Ze Zhang, Peirui Ji, and Wei Chengyi. "Research on Terahertz Detector Based on Graphene Nanoribbon and Micron Ribbon." In International Conference of Asian Society for Precision Engineering and Nanotechnology. Research Publishing Services, 2022. http://dx.doi.org/10.3850/978-981-18-6021-8_or-12-0115.html.

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Reports on the topic "Graphene-based detector"

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Yang, Eui-Hyeok, Stefan Strauf, Vikram Patil, and Kitu Kumar. Wavelength-Tunable IR Detector based on Suspended Bilayer Graphene Micro Ribbons. Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ada593007.

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Harrison, Richard Karl, Jeffrey B. Martin, Dora K. Wiemann, Junoh Choi, and Stephen W. Howell. New radiological material detection technologies for nuclear forensics: Remote optical imaging and graphene-based sensors. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1214453.

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