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Dissertations / Theses on the topic 'ZnO Nanoparticle'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Sandner, Julian Christoph. "Die toxikologische Relevanz der Zn2+-Freisetzung bei der Degradation von ZnO-Nanopartikeln." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-211704.

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Nanoobjekte werden als eines der meist untersuchten Forschungsgebiete unserer Zeit immer beliebter in der Industrie, da durch Variation ihrer Strukturen besondere Eigenschaften entlockt werden können, die bei makrokristallinen Kompositionen nicht auftreten. Doch mit Zunahme der Anwendungsbereiche steigt wiederum die Wahrscheinlichkeit einer hohen Exposition, was die toxikologischen Untersuchungen der letzten Jahre bedingte. Allerdings wurden dabei weniger die kausalen Zusammenhänge eruiert. In dieser Arbeit zeigt der Autor die Beziehungen zwischen ZnO-Toxizität und intrazellulärer Zn2+-Konzent

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Raevskaya, A. E., Ya V. Panasiuk, O. L. Stroyuk, et al. "Spectral and luminescent properties of ZnO–SiO2 core–shell nanoparticles with size-selected ZnO cores." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-161737.

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Deposition of silica shells onto ZnO nanoparticles (NPs) in dimethyl sulfoxide was found to be an efficient tool for terminating the growth of ZnO NPs during thermal treatment and producing stable core–shell ZnO NPs with core sizes of 3.5–5.8 nm. The core–shell ZnO–SiO2 NPs emit two photoluminescence (PL) bands centred at [similar]370 and [similar]550 nm originating from the direct radiative electron–hole recombination and defect-mediated electron–hole recombination, respectively. An increase of the ZnO NP size from 3.5 to 5.8 nm is accompanied by a decrease of the intensity of the defect PL b

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3

Vidor, Fábio Fedrizzi. "Study of the hysteretic behavior in ZnO nanoparticle thin-film transistors." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/71874.

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Nas últimas décadas, o interesse na eletrônica flexível tem aumentado. Sistemas que apresentam benefícios, tais como: baixo custo, melhor desempenho, transparência, confiabilidade e melhores credenciais ecológicas, estão sendo extensivamente pesquisados por vários grupos. Os transistores de filmes-finos possuem potencial para alcançarem essas características. Dispositivos baseados em óxido de zinco (ZnO) tem atraído pesquisadores devido as suas propriedades elétricas, sensoriais e ópticas. Neste trabalho, nanopartículas de ZnO foram utilizadas como semicondutor ativo e cross-linked PVP (polivi

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4

Zobel, Mirijam [Verfasser], and Reinhard [Akademischer Betreuer] Neder. "Nanoparticle crystallization and solvent interface restructuring especially for ZnO nanoparticles in organic solvents / Mirijam Zobel. Gutachter: Reinhard Neder." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2016. http://d-nb.info/1081544090/34.

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5

Walker, Nicholas David Leyland. "The role of the nano-environmental interface in ZnO and CeO2 nanoparticle ecotoxicology." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3734.

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An increase in nanotechnology has seen an associated rise in nanoparticles released into the environment. Their potential toxicity and exposure to humans and the environment, the field of nanoecotoxicology, is not yet well understood. The interactions at the nanoparticle surface will play a fundamental role in the nanoparticle behaviour once released into the environment. This study aims to characterise the particle surface interaction, determining key parameters influential in the nanoparticle fate. Evanescent Wave Cavity Ring Down Spectroscopy techniques have been applied to study molecular

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CRAPANZANO, ROBERTA. "Insight into ZnO luminescence to engineer nanoparticles for X-Ray based cancer treatment." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/366193.

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Nanoparticles disclose unique properties that enable their applications in different fields, such as energy, catalysis, opto-electronics, and medicine. At the nanosize, the surface-to-volume ratio is increased, leading to the formation of defects that influence the resultant features, e.g. the catalytic and optical behaviours of the systems. Moreover, the high surface area and reactivity of nanoparticles allow their functionalization with several ligands, enhancing their versatility, especially in the biomedical field. Indeed, the accuracy and efficiency of several diagnoses and treatments ma

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7

Wong, Ka-kan, and 黃嘉勤. "Investigation on the effect of ZnO nanoparticle properties on dye sensitized solar cell performance." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49618246.

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Zinc oxide (ZnO) is a wide band-gap semiconductor that is of interest for application in dye sensitized solar cells (DSSCs) because of similarity of its properties to TiO2. Unlike TiO2, ZnO can readily be grown in a wide variety of morphologies, using inexpensive, simple, and low temperature methods. Recent research on ZnO-based DSSCs focuses on modifying the ZnO layer morphology in order to maximize surface area, and enhance the electron collection by providing fast electron transport. It is expected that the improvement in cell performance by morphology modification is due to higher dye loa

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8

Nateq, Mohammad Hosein. "Enhancing the Photo-electrode Features to Improve the Solar Conversion Efficiency in the Dye-Sensitized Solar Cell." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/243450.

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Mesoporous semiconductors such as TiO2 nanoparticles, as well as transparent conducting oxides (TCOs) such as indium tin oxide films are typically employed for setting up the photo-electrode module in variety of photoelectrochemical cells including Dye-Sensitized Solar Cells (DSSCs). In order to exhibit a high performance efficiency, the photo-electrodes in such applications are required to be able to harvest the light and transport the generated electrons effectively. Accordingly mesoporous layers with high values of surface area and well-established pore structure along with highly transpare

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9

Nateq, Mohammad Hosein. "Enhancing the Photo-electrode Features to Improve the Solar Conversion Efficiency in the Dye-Sensitized Solar Cell." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/243450.

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Mesoporous semiconductors such as TiO2 nanoparticles, as well as transparent conducting oxides (TCOs) such as indium tin oxide films are typically employed for setting up the photo-electrode module in variety of photoelectrochemical cells including Dye-Sensitized Solar Cells (DSSCs). In order to exhibit a high performance efficiency, the photo-electrodes in such applications are required to be able to harvest the light and transport the generated electrons effectively. Accordingly mesoporous layers with high values of surface area and well-established pore structure along with highly transpare

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10

Louka, Chrysovalanto. "Controlling the toxicity of zinc oxide nanowires in vitro skin models." Thesis, Université Grenoble Alpes, 2020. https://thares.univ-grenoble-alpes.fr/2020GRALU004.pdf.

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Les nanofils d'oxyde de zinc (ZnONW) attirent beaucoup d'attention scientifique en raison de leurs propriétés optoélectriques, piézoélectriques et semi-conductrices, qui en font un bon candidat pour les capteurs et l'électronique intégrées dans les textiles. Ces applications augmentent les risques d'exposition cutanée, de qui rend l’étude de leur toxicité cruciale, d'autant plus que les études récentes démontrent une toxicité liée aux ions de zinc due à la dissolution. Malheureusement, la compréhension de l'impact des ZnONWs sur la peau est limitée. Par conséquent, l'objectif de ce projet est

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11

Chassaing, Pierre-Marie. "Quelques illustrations du rôle de la surface dans des nanoparticules de ZnO." Phd thesis, Université Paul Sabatier - Toulouse III, 2009. http://tel.archives-ouvertes.fr/tel-00406581.

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Ce travail de thèse porte sur l'étude des excitations élémentaires de la matière dans des nanoparticules de ZnO: phonons et excitons.<br /> Nous montrons que les modes de vibration permettent d'illustrer des effets de surface, lesquels sont de deux types. Premièrement vient la réduction de la taille. L'élasticité linéaire ne décrit plus correctement les modes propres acoustiques pour des tailles inférieures à 2.5 nm. Les expériences que nous avons menées sont en accord avec ce point. Deuxièmement, nous montrons que les ligands qui habillent les nanoparticules sont préférentiellement localisés

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12

Zhao, Zhihua. "Systèmes hybrides : de la nanoparticule aux gels." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30118/document.

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Ce travail de thèse porte sur une meilleure compréhension de la croissance de nanoparticules d'oxyde de zinc élaborées à partir d'une approche organométallique. Au cours de ce travail, une analyse de la taille des nanoparticules en utilisant un outil simple basée sur une représentation bidimentionnelle couplée à une analyse statistique multivariée. Elle permet d'extraire la corrélation éventuelle entre la longueur et la largeur des nanoparticules. Cette approche permet de traiter un ensemble de nanoparticules homogène ou hétérogène en taille et en forme. Comparée à l'approche statistique usuel

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13

Ngo, Van Giang. "Nanoparticules hybrides oxydes métalliques/polymères : synthèse et caractérisation." Phd thesis, Toulon, 2011. http://tel.archives-ouvertes.fr/tel-00768240.

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L'objectif de cette étude consiste à synthétiser et caractériser de nouveaux matériaux hybrides organique/inorganique obtenus par greffage de poly(méthacrylate)s d'alkyle sur des nanoparticules de dioxyde de titane (TiO2) et d'oxyde de zinc (ZnO). Afin de mieux comprendre les facteurs influents les réactions mises en jeu lors d'un greffage à partir de la surface d'un oxyde métallique, nous avons choisi de travailler avec des nanoparticules disponibles commercialement et/ou élaborées. Des nanoparticules d'oxyde de zinc, de dimensions allant de 5 à 100 nm, ont été synthétisées par la méthode de

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14

Pujalte, Igor. "Étude in vitro de la toxicité de nanoparticules métalliques (TiO2, ZnO, CdS) sur la cible rénale." Thesis, Bordeaux 2, 2011. http://www.theses.fr/2011BOR21849/document.

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De nombreuses incertitudes persistent sur la toxicité potentielle des nanoparticules (NPs) et leur devenir dans l’organisme humain. L’objectif de ce travail est de mieux comprendre les mécanismes cytotoxiques induits par des NPs métalliques sur une cible secondaire, représentée par le rein. En effet, les NPs sont susceptibles de franchir les barrières cellulaires, d’être véhiculées par le sang pour se retrouver filtrées par le rein au niveau des cellules glomérulaires et peut-être, réabsorbées au niveau des cellules tubulaires. Cette étude est réalisée in vitro, avec des NPs métalliques de tit

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15

Lee, Kwang Jik. "Study of stability of ZnO nanoparticles and growth mechanisms of colloidal ZnO nanorods." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4303.

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After hydrolyzing zinc acetate in methanol solution, spherical ZnO nanoparticles in the size range from about 2.5 to 5 nm were synthesized by maintaining a ZnO concentration of 0.02M. Compared to ZnO nanoparticles prepared via other methods, the particles prepared using our novel colloidal chemistry exhibit narrow size distribution and a high sensitivity to the surrounding environment. The structure and composition of the white powders precipitated from the colloidal solution can vary, depending on how the powder samples are prepared. Factors such as desorption and adsorption of methanol, bind

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16

RIGONI, FEDERICA. "EXPLORING DETECTION LIMITS AND RESPONSE TIME SCALES OF CHEMIRESISTOR GAS SENSORS BASED ON CARBON NANOTUBE AND HYBRID LAYERS." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/262413.

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Crucial features in gas sensors for environmental monitoring are the gas sensitivity in the low ppb range and the ability to discriminate variations of a certain polluting gas from other interfering gases. Monitoring of ammonia gas concentrations is mandatory to reduce the hazard for human health and vegetation determined by the widespread use of ammonia derivatives as agricultural nitrogen fertilizers, industrial production and traffic. In particular, ammonia, besides being a toxic molecule is one of the main precursors of secondary fine particulate matter (PM10, PM2.5). Ammonia could hence

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17

Brayek, Amine. "Etude des propriétés photo-électrochimiques des structures cœur-coquille ZnO/ZnS électrodéposées sur verre-ITO." Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC075.

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Les structures à hétérojonction attirent beaucoup d'attention à l'amélioration de l'injection d'électrons à travers l'interface. L'hétérojonction unidimensionnelle ZnS@ZnO est synthétisée sur des substrats conducteurs de verre d'une manière contrôlée, au moyen d'un dépôt électrochimique simple en deux étapes et d'une sulfuration chimique de nanofil de ZnO comme matrice réactive. Les propriétés photoélectrochimiques (PEC) des hétérostructures résultantes ont été mesurées, en utilisant une cellule électrochimique éclairée par une lampe au xénon standard. Les réseaux de nanofils ZnO@ZnS core-shel

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18

Balti, Imen. "Nanohybrides inorganique-organiques à base de ZnO, Zn0,95Ni0,05O,coeur-coquille ZnO@γ-Fe2O3 et de polymères bioactifs : Elaboration,propriétés optiques et magnétiques, cytotoxicité". Paris 13, 2012. http://scbd-sto.univ-paris13.fr/intranet/edgalilee_th_2012_balti.pdf.

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Des nanoparticules des oxydes : ZnO, Zn0,95Ni0,05O et coeur-coquille ZnO@γ-Fe2O3 ont été synthétisées par hydrolyse forcée en milieu polyol. Les particules sont quasi-sphériques de diamètre moyen 20-30 nm. Les trois classes présentent des propriétés de photoluminescence alors que les nanoparticules de l’oxyde de zinc dopé au nickel et les nanoparticules ZnO@γ-Fe2O3 sont superparamagnétiques. Grâce à la polymérisation radicalaire contrôlée, deux polymères bioactifs (le poly(sodium-4-styrenesulfonate) et le poly(sodium-4-styrenesulfonate–co–sodium methacrylate)) ont été greffés à la surface de c

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19

Rubio-Garcia, Javier. "Strategies to yield water dispersible ZnO NPs synthesized by an organometallic approach." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/891/.

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Le nombre d'études sur la synthèse et l'application de matériaux semi-conducteurs a augmente au cours des dernières années dû à la dépendance de propriétés physiques et chimiques de ces matériaux avec la taille. Plusieurs applications ont émergées, notamment dans les domaines de la biomédecine, les cellules solaires ou de l'électronique. Parmi les matériaux semi-conducteurs connus, ZnO nanométrique est un bon candidat pour ces applications car il est relativement peu coûteux et respectueux avec l'environnement. Des méthodes physiques et chimiques permettant la production de nanostructures de Z

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20

Hagelin, Alexander. "ZnO nanoparticles : synthesis of Ga-doped ZnO, oxygen gas sensing and quantum chemical investigation." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-64730.

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Doped ZnO nanoparticles were synthesized by three different methods – electrochemical deposition under oxidizing conditions (EDOC) , combustion method and wet chemical synthesis – for investigating the oxygen gas sensing response. Ga-doped ZnO was mostly synthesized but also In-doped ZnO was made. The samples were analyzed by XRD, SEM, EDX and TEM. Gas response curves are given alongside with Langmuir fitted curves and data for pure ZnO and Ga-doped ZnO. DFT quantum chemical investigation of cluster models ZnO nanoparticles were performed to evaluate defect effects and oxygen and nitrogen diox

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21

Piolet, Romain. "Synthèse hydrothermale de nanoparticules de ZnO au-delà du point critique : compréhension des étapes de germination et de croissance." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS004/document.

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La production hydrothermale de nanomatériaux pulvérulents (de type oxyde métallique) en conditions supercritiques a été largement reportée sans pour autant avoir connaissance des mécanismes de formation de ces nano-objets. Ainsi, cette étude est consacrée à la compréhension des mécanismes de nucléation et de croissance de nanoparticules d’oxyde métallique. L’oxyde de zinc a été choisi comme matériau « modèle ». Dans un premier temps, l’influence des conditions opératoires telles que la pression, la température, le pH, la concentration des précurseurs ou encore les débits des solutions sur les

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22

Ngo, Van Giang. "Nanoparticules hybrides oxydes métalliques/polymères : synthèse et caractérisation." Electronic Thesis or Diss., Toulon, 2011. http://www.theses.fr/2011TOUL0016.

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L’objectif de cette étude consiste à synthétiser et caractériser de nouveaux matériaux hybrides organique/inorganique obtenus par greffage de poly(méthacrylate)s d’alkyle sur des nanoparticules de dioxyde de titane (TiO2) et d'oxyde de zinc (ZnO). Afin de mieux comprendre les facteurs influents les réactions mises en jeu lors d'un greffage à partir de la surface d'un oxyde métallique, nous avons choisi de travailler avec des nanoparticules disponibles commercialement et/ou élaborées. Des nanoparticules d’oxyde de zinc, de dimensions allant de 5 à 100 nm, ont été synthétisées par la méthode de

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23

Spisni, Eleonora. "Toxicity assessment of industrial- and sunscreen-derived ZnO nanoparticles." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11272/.

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Lo scopo della presente tesi è l’analisi della tossicità di nanoparticelle di ossido di zinco (nano-ZnO) verso gli organismi acquatici. In particolare, il presente studio valuta per la prima volta l'inibizione della crescita della diatomea Thalassiosira pseudonana indotta sia da nanoparticelle di dervazione industriale, che da nanoparticelle auto-estratte in laboratorio da un filtro solare. Gli esperimenti, condotti presso il Laboratorio di Ingegneria dell'Università di Miami, hanno mostrato che la tossicità indotta dalle nanoparticelle di ossido di zinco è influenzata dal tipo di nanoparticel

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Zhang, Miao. "Defects in ZnO nanoparticles obtained by gas-phase syntheses." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066259.

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L’attribution des signatures spectrales liées aux défauts dans l’oxyde de zinc fait encore l’objet de controverses. Ceci est probablement dû à la grande variété de défauts possibles, à l’incertitude de leur niveau d’énergie ainsi que leur énergie de formation dans la bande interdite. De plus, l’imprécision concernant les conditions de mesures et la possible présence d’impuretés inhérentes à certaines méthodes de synthèse peuvent souvent mener à des interprétations erronées. Le but de ce travail de thèse est donc d’identifier les défauts intrinsèques naturellement présents dans du ZnO fraîcheme

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Zhang, Miao. "Defects in ZnO nanoparticles obtained by gas-phase syntheses." Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066259.

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L’attribution des signatures spectrales liées aux défauts dans l’oxyde de zinc fait encore l’objet de controverses. Ceci est probablement dû à la grande variété de défauts possibles, à l’incertitude de leur niveau d’énergie ainsi que leur énergie de formation dans la bande interdite. De plus, l’imprécision concernant les conditions de mesures et la possible présence d’impuretés inhérentes à certaines méthodes de synthèse peuvent souvent mener à des interprétations erronées. Le but de ce travail de thèse est donc d’identifier les défauts intrinsèques naturellement présents dans du ZnO fraîcheme

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Byl, Céline. "Synthèse et caractérisation de nanocomposites à base de ZnO pour des applications thermoélectriques." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112045/document.

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Ce travail de thèse a pour objectif l’obtention de nanocomposites denses ZnO/SiO2 afin d’améliorer les propriétés thermoélectriques de l’oxyde de zinc. Ce manuscrit décrit différents aspects de l’élaboration tant en terme de synthèse que de densification de nanocomposites ZnO/SiO2 ainsi que leur caractérisation. Afin d’obtenir des nanoparticules en grande quantité, de bonne cristallinité et de taille inférieure à 10 nm, l’optimisation d’une synthèse par voie polyol en jouant sur différents paramètres (pH, température, taux d’hydrolyse, solvant, surfactant) a été réalisée. Nous avons pu mettre

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Fernando, Joseph F. S. "Crystal seeding and photochemistry of gold-zinc oxide hybrid nanoparticles." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/101206/1/Joseph_Fernando_Thesis.pdf.

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This project investigated the synthesis of hybrid nanoparticles of gold and zinc oxide by using photodeposition and crystal seeding approach. The study extended our understanding of the factors that determine nanocrystal size, shape and ratio of gold and zinc oxide in the hybrid system. Control at this scale is important from a materials-engineering viewpoint and for technological applications such as nonlinear optics, photocatalysis and photovoltaics. This research found that nonlinear optical absorption of zinc oxide can be enhanced by several orders of magnitude by coupling zinc oxide nanop

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Tsung, Chang Che. "Investigation on a change in response direction of Ga doped ZnO nanoparticles resistive sensors on exposure to NO." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80111.

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Semiconductor-based gas sensors have been used for a wide range of applications over the last few decades. In this thesis, sensing properties of pure ZnO and Ga doped ZnO are investigated. There are three types of tested gas species, H2, O2 and NO, and three test temperatures, 300oC, 400oC and 500oC. After measurements of response to exposure to H2 and O2, it is concluded that Ga doped ZnO and ZnO are both n-type metal oxides. In measurements of NO, two test conditions were considered, the case with background O2 (10%) in the gas flow and the case without background O2. NO can be oxidized to N

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Cruz, González Sara. "Availability of metal ions and ZnO nanoparticles in aqueous media." Doctoral thesis, Universitat de Lleida, 2015. http://hdl.handle.net/10803/314762.

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La presència de determinats metalls, ja sigui en forma del metall lliure, formant complexos amb lligands o en forma de nanopartícules metàl•liques té efectes negatius en el medi ambient. Per aquest motiu, l’estudi de la disponibilitat de metalls és important per determinar el seu impacte mediambiental. En aquest treball s'ha estudiat un sistema i una tècnica per a la mesura de la disponibilitat. El sistema té la particularitat de contenir, en dispersió, nanopartícules d’òxids metàl•lics. Una primera part de l’estudi s’enfoca a la caracterització físic-química de dispersions sintètiques de na

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Zhang, Lingling. "Antimicrobial behaviour of suspensions of ZnO nanoparticles towards Escherichia Coli." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487794.

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Antibacterial agents are of relevance to a number of industrial sectors including medical, healthcare, food and environment. Organic antibacterial agents kill or inhibit the growth of bacteria by interrupting the synthesis of protein, lipid, nucleic acids or the integrity of the bacterial membrane. Heavy metals and metal oxides have a long application history in inhibiting the growth of bacteria.

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Singh, Jai, O. N. Srivastava, R. S. Tiwari, and P. Kumar. "Structural and optical investigations of low temperature solution based synthesized ZnO and Ag admix ZnO nanoparticles (NPs)." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20574.

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Walden, Sarah L. "Nonlinear optical properties of ZnO and ZnO-Au composite nanostructures for nanoscale UV emission." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/114126/9/Sarah_Walden_Thesis.pdf.

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This thesis investigates the nonlinear optical properties of ZnO and ZnO-Au composite nanostructures. For applications such as photodynamic therapy, it is desirable to use nanoparticles to generate localised UV emission while illuminating them with visible or infrared light. This is possible using nonlinear optical processes such as two photon absorption. Nonlinear optical processes however, are extremely weak, so this work investigates the potential of increasing the efficiency of two photon absorption in ZnO nanoparticles by coupling them to metal nanoparticles. Using new experimental method

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Taïnoff, Dimitri. "Influence des défauts sur les propriétés optiques et électroniques des nanoparticules de ZnO." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00507281.

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L'objectif de cette étude est de mieux comprendre le rôle joué par les défauts dans les propriétés optiques et électroniques des nanostructures d'oxyde de zinc. Pour ce faire, nous avons synthétisé des nanoparticules d'oxyde de zinc de 6 à 18 nm de diamètres pouvant être considérées comme modèle en terme de stœchiométrie, de cristallinité et de qualité de surface par une méthode physique originale : la Low Energy Cluster Beam Deposition.La caractérisation optique des défauts présents dans les nanoparticules de ZnO a été faite grâce à l'analyse des spectres d'émission visible et UV à différente

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Richter, Thomas [Verfasser], and Rolf [Akademischer Betreuer] Mülhaupt. "Synthetic design of solution processable semiconductors and their application in optoelectronics – 3D polythiophenes and ZnO nanoparticles = Synthetisches Design von lösungsprozessierbaren Halbleitern und deren Anwendung in optoelektronischen Bauteilen - 3D Polythiophene und ZnO Nanopartikel." Freiburg : Universität, 2011. http://d-nb.info/1123465762/34.

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Jiang, Yunhong. "Antimicrobial behaviour of Polyvinyl Chloride(PVC) films coated with ZnO nanoparticles." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.545697.

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Ibrahem, Mohammed A. "Multiwavelength photoconductivity of ZnO nanoparticles based on surface defects and plasmonics." Thesis, University of Hull, 2017. http://hydra.hull.ac.uk/resources/hull:16599.

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ZnO is distinguished as the semiconductor of choice in a variety of applications such as in optoelectronics and photodetectors owing to its superior light sensitivity, the ease of synthesis in a wide range of nanostructure forms and its tuneable optical and electrical properties. Herein, ZnO photoconductivity is investigated for two purposes; firstly, to assess device stability with different preparation conditions and environments and secondly, to improve and extend photodetection of ZnO into the visible and near-infrared by stimulating surface defects and plasmonics effect. Persistent photoc

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Shahmoradi, B., and A. Mateki. "Surface modification of ZnO and Ti02 nanoparticles under mild hydrothermal conditions." Thesis, Sumy State University, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20866.

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There are various techniques for synthesizing different Nanoparticles depending upon the desired properties, application, etc. One of these widely applied techniques is Hydrothermal. However, this technique is known for bulky materials and fabrication of nano-scale materials requires adopting some strategies to alter the properties of materials synthesized. We developed surface modification for this drawback. Application of surface modifier, or surfactant, or capping agent, or organic ligands in proper concentration could not only change morphology, reduce particle size, but also change

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Londono, Zuluaga Nathalia. "Impacts of engineered nanoparticles (TiO2, ZnO, Ag) on aquatic microbial communities." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/1858.

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The production and uses of engineered nanoparticles (ENPs) have been increasing with the expansion of science and technology, and their unavoidable disposal into the soil and waterways, eventually ended up in the ocean causes serious concerns about their potential hazards to the environment and human health. The need to comprehend the impacts of ENPs in our aquatic ecosystem has motivated this research to study: 1) effect of TiO2 on Crypthecodinium cohnii; 2) effects of TiO2 and ZnO on an aquatic microbial community simulating a static lake environment; and 3) effects of TiO2, ZnO and Ag on a

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Zhu, Yao. "ZnO nanoparticles as a luminescent down-shifting layer for solar cells." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0090/document.

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Le but de cette thèse était de concevoir des matériaux à base de nanoparticules de ZnO qui puissent être utilisés de manière efficaces comme couche de down-shifting sur la face avant des cellules solaires photovoltaiques. Le défi principal a donc été d’obtenir des nanoparticules de ZnO avec un rendement de photoluminescence (PL QY) aussi élevé que possible. Diverses méthodes ont été et comparées utilisées pour la synthèse de nanoparticules de ZnO. Nous avons en premier lieu étudié des particules synthétisées par voie physique (le dépôt par jet d’agrégats de basse énergie, LECBD). Les particule

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Fatima, Hira. "Synthesis and characterization of ZnO-based/derived nanoparticles as promising photocatalysts." Thesis, Curtin University, 2022. http://hdl.handle.net/20.500.11937/89248.

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Biocompatibility and the ability to create tumor-killing reactive oxygen species have drawn increasing attention to zinc oxide (ZnO) based/derived nanoparticles for photodynamic treatment. There are several variables that may affect the performance of ZnO-based NPs in PDT that can be manipulated by doping and compositing. Among these variables are the charge separation, the absorption potential, and the bandgap engineering. In this thesis, we reviewed designed and developed improved photodynamic performance ZnO based/derived nanoparticles.

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Acuautla, Meneses Monica Isela. "Development of ozone and ammonia gas sensors on flexible substrate." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4337/document.

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L'émergence des nouvelles applications dans le domaine de la micro et nanotechnologie requière de faibles coûts de fabrication et la caractérisation de dispositifs électroniques ayant des propriétés telles que la flexibilité, la portabilité, la légèreté, et des matériaux de faibles coûts. Les méthodes traditionnelles de fabrication impliquent de longues étapes de production, et des procédés de fabrication impliquant des étapes avec des produits chimiques. Le but de cette thèse est d'étudier la conception et la caractérisation de capteurs d'ammoniac et d'ozone sur support souple fabriqués par d

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SUSANNA, ANTONIO. "Highly Efficient MeO Nanoparticles as Curing Activator for Rubber Composites." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2016. http://hdl.handle.net/10281/129620.

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The vulcanization of rubber by sulfur is a large-scale industrial process that improves the mechanical properties of unsaturated rubber by the cross-linking of polymer chains. Microcrystalline ZnO particles are currently used as activator to enhance the efficiency of the crosslinking. Due to their not easy dispersion in the rubber matrix and to the relatively small fraction of ZnO which actually reacts with the other curative compounds, a large amount of oxide is required for the process. This leads to a not homogeneous vulcanization with inefficient polymer network structure and a possible re

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Sunyani, Meenaketan. "Synthesis and Characterization of ZnO and Ti4+ Modified ZnO Nanoparticles and Their Photocatalytic Performance." Thesis, 2015. http://ethesis.nitrkl.ac.in/7845/1/2015_Synthesis_Sunyani.pdf.

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In the present work pure ZnO and Ti4+ doped ZnO nanoparticles were synthesized by co-precipitation method directly from an aqueous solution of zinc acetate dehydrate and sodium hydroxide. As-prepared precursor was calcined at 500°C and 600°C temperature for 2 h. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and UV-DRS spectroscopy. Results show that the calcinations temperature and Ti4+ doping significantly affected the crystalline nature, and optical properties of the processed ZnO nanoparticles. The XRD spectra indicated that

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Behera, Jayanta Kumar. "Synthesis and Characterizations of ZnO Nanoparticles." Thesis, 2009. http://ethesis.nitrkl.ac.in/182/1/final_final_jayanta_thesis.pdf.

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The ZnO nanoparticles were prepared by two different methods where the size of the particles formed were found to be 320 nm and 559 nm studied by the particle size analyzer. The XRD patterns of these sample revealed that the required phase is present with a little amount of impurities. The particle size measurement which was done by particle analyzer was supported by the XRD Scherer’s formula. SEM micrographs of ZnO-1 sample showed that agglomeration has been taken place where as in ZnO-2 sample showed no more agglomeration. EDX of the ZnO-1 sample confirmed the presence of both Zn and O. DSC

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Shao-ChiehLu and 呂紹傑. "ZnO/graphene composite blended ZnO nanoparticle films for photocatalyst and solar cell applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/77034312135695766767.

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碩士<br>國立成功大學<br>化學工程學系碩博士班<br>101<br>In this study, zinc oxide/reduced graphene oxide composites were synthesized for the applications to phtotcatalysts and dye sensitized solar cells (DSSCs). Graphene oxide was synthesized using solution process. The oxidation degree of graphene oxide was determined by Atomic Force Microscope (AFM) and X-ray diffraction (XRD). A green reductant—vitamin C was used to reduce the graphene oxide. X-ray photoelectron spectrometer (XPS), Raman and UV-visible adsorption were employed to analyze the reduction degree of reduced graphene oxide (rGO). In order to improv

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Tiwari, Archana. "Growth of ZnO nanowire and its application as UV photodetector." Thesis, 2014. http://ethesis.nitrkl.ac.in/6492/1/E-28.pdf.

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Zinc Oxide (ZnO) nanostructures with their significant properties have various application in optoelectronics, sensor devices and energy conversion devices. This report includes deposition of ZnO film by rf reactive sputtering on glass substrate. Its analysis using XRD, FESEM and UV-VIS spectroscopy to study its morphology, crystal structure, band gap and transmittance. Further, the deposited film is taken as substrate for the growth of ZnO nanowires using Hydrothermal Method. Various parameters affecting the growth conditions like growth temperature, growth time, and precursor concentration h

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Biswas, Bivash. "Photocatalytic Degradation of Rhodamine B by ZnO Nanoparticles under Natural Sunlight." Thesis, 2015. http://ethesis.nitrkl.ac.in/6842/1/Photocatalytic_Biswash_2015.pdf.

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ZnO nanoparticles were synthesized by using wet chemical route directly from an aqueous solution of zinc acetate dehydrate[Zn(C2H3O2)2.2H2O] and in the presence of sodium dodecyl sulfate (SDS).A comparative study was doneon optical properties and photocatalytic activity of ZnO synthesized using two different precipitating agentsof NaOH and NH4OH. The as synthesized Zn(OH)2powders were calcined at a temperature of 650?C.The materials prepared were characterized by UV-visible spectroscopy and photoluminescence (PL) studies.The photocatalytic activity were evaluated by using theRhodamin B (RhB) a

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Tseng, Ting-Chao, and 曾亭詔. "Graphene/ZnO nanoparticle composite films for Dye-Sensitized Solar Cells." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/zjhpau.

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碩士<br>國立臺北科技大學<br>有機高分子研究所<br>102<br>The effects of zinc oxide doped graphene working electrode of dye-sensitized solar cells were investigated in this study. The control variables included the dispersion of graphene, the size of graphene, the amount of functional groups of grapheme, and the graphene content and thinckness of the Graphene/zinc oxide composite films. During graphene doping zinc oxide process, the graphene dipped in the mixed acid ( nitric acid : sulfuric acid = 3 : 1 ) was treated in ultrasonic bath at 60 ℃ for 2 hours. The treated graphene was cleaned with deionized water unti

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Fiedler, Saskia. "Enhancement of the UV emission in metal nanoparticle-coated ZnO." Thesis, 2018. http://hdl.handle.net/10453/129417.

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University of Technology Sydney. Faculty of Science.<br>Large emission enhancement factors resulting from orders of magnitude increases in ultra-violet (UV) luminescence in ZnO have been reported, due to the presence of a surface coating of either Au or Al nanoparticles. Two significantly different models have been proposed to explain the observed increase in the UV light output. One involving the decay of metal nanoparticles localised surface plasmons (LSP) into hot carriers and their radiative recombination following injection into the ZnO conduction and valence bands. The other describes th

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Ghosh, Surya Prakash. "Synthesis & Characterizations of ZnO Thin Films and Nanostructures by Modified Aqueous Chemical Growth Method for Sensor Applications." Thesis, 2015. http://ethesis.nitrkl.ac.in/6909/1/Surya_Mtech(r)_612PH302.pdf.

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In recent years, there is a great demand on the development of portable, low cost, low power operated high performance sensors for medical diagnosis, defence, space, agriculture and industrial applications. Remarkable research on the fabrication of the semiconducting metal oxide (ZnO) based resistive sensors are currently being drawn considerable continuous attention for sensor fabrication because of its semiconducting nature, direct and wide bandgap (3.37 eV), ease of fabrication, low cost, non toxic nature, high temperature stability and CMOS compatibility. In order to achieve low cost por

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