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Dissertations / Theses on the topic 'Heterostructured photocatalyst'

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Published: 19 October 2024

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1

Kashiwaya, Shun. "Science de surface et propriétés chimiques d'hétérostructures NiO/TiO2 monocristallin." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0241/document.

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Les photocatalyseurs à base de TiO2 ont été l’objet d’une grande attention comme une méthode durable de purification de l’air ou de l’eau, et de production d’hydrogène par décomposition de l’eau. Une stratégie avantageuse consiste à développer des héterostructures par couplage avec un autre oxyde métallique former une jonction de type Schottky ou avec un autre oxyde métallique pour créer une jonction p-n à l’interface de manière à prévenir les recombinaisons via une séparation de charge « vectorielle » à ces jonctions. De plus, les facettes cristallines jouent un rôle crucial dans le piégeage

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2

Uddin, Md Tamez. "Metal oxide heterostructures for efficient photocatalysts." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00879226.

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Photocatalytic processes over semiconducting oxide surfaces have attracted worldwide attention aspotentially efficient, environmentally friendly and low cost methods for water/air purification as well as forrenewable hydrogen production. However, some limitations to achieve high photocatalytic efficiencies havebeen found due to the fast recombination of the charge carriers. Development of heterostucture photocatalystsby depositing metals on the surface of semiconductors or by coupling two semiconductors with suitable bandedge position can reduce recombination phenomena by vectorial transfer of

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3

Xing, Congcong. "TiO2-based heterostructure photocatalysts for enhanced hydrogen production." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672368.

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The photocatalytic production of hydrogen from water and biomass derivatives such as ethanol, glycerol and sugars is a highly attractive strategy to generate environmentally benign hydrogen. Ethanol is more easily oxidized than water by holes in the valence band (VB) of photoexcited semiconductors, which also helps to suppress the recombination of electron-hole pairs, thus increasing the usage of electrons in the conduction band (CB) of photoexcited semiconductors to yield hydrogen. Titanium dioxide (TiO2) has been widely investigated in the field of photocatalysis due to its photosensitivit

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4

Khon, Elena. "Synthesis and Applications of Heterostructured Semiconductor Nanocrystals." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1374512926.

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5

Qiao, Yu. "Preparation, Characterization, and Evaluation of Photocatalytic Properties of a Novel NaNbO3/Bi2WO6 Heterostructure Photocatalyst for Water Treatment." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38080.

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Semiconductor-based heterogeneous photocatalysis, as one of the advanced oxidation processes that makes use of semiconductors and inexhaustible solar light, has recently been extensively studied and applied to water decontamination. However, due to low light absorption efficiencies and severe electron-hole recombination, modifications on semiconductor structures are required in order to enhance their photocatalytic performance. Heterogeneous photocatalyst composites, taking advantage of the improved light absorption efficiency as well as the facilitated electron-hole separation at the interfac

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6

Uddin, Md Tamez [Verfasser], Catherine [Akademischer Betreuer] Louis, and Sophie [Akademischer Betreuer] Cassaignon. "Metal oxide heterostructures for efficient photocatalysts / Md. Tamez Uddin. Betreuer: Catherine Louis ; Sophie Cassaignon." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2014. http://d-nb.info/111090326X/34.

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7

Rogé, Vincent. "Etude, fabrication et caractérisation de nanostructures catalytiques de type ZnO/SnO2 intégrées à des membranes modèles pour la dépollution de l'eau." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAF046/document.

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La dépollution de l'eau est un des enjeux majeurs du XXIème siècle. Si différentes techniques de retraitement existent déjà, nous investiguons une nouvelle méthode associant les propriétés des membranes filtrantes à celles des matériaux photocatalytiques. Ainsi, nous avons étudié la croissance et l'activité photocatalytique de structures de type noyau/coquille de ZnO/SnO2 intégrées dans des membranes méso-poreuses (alumine poreuse) et macro-poreuses (fibres de verre). L'activité photocatalytique de ces matériaux a été évaluée sur des polluants modèles tels que le bleu de méthylène ou l'acide s

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8

Lavergne, Marie-Anne. "Synthèse et caractérisation d'oxydes mixtes de bismuth pour la photocatalyse dans le visible." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066236/document.

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L'objectif de ce travail est d'améliorer les performances photocatalytiques de deux oxydes mixtes de bismuth, Bi2WO6 et BiOBr, présentant une activité sous lumière visible. Leurs activités photocatalytiques sont en effet majoritairement limitées par un taux de recombinaison des charges photoinduites élevé. Deux stratégies différentes ont été respectivement appliquées pour chaque matériau. La première consiste à former une hétérostructure entre Bi2WO6 et un métal noble, le platine, pour assurer une séparation efficace des charges. La seconde consiste à réduire la taille des particules de BiOBr

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9

Ibn, Mahrsi Mouna. "Nanohybrides ZnO/Ag ou ZnO/oxyde de cuivre pour applications photocatalytiques." Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0044.

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La croissance rapide de la population ainsi que l'industrialisation ont suscité des inquiétudes majeures quant à la disponibilité de l'énergie et à la pollution de l'environnement. La résolution de ces problèmes est au cœur de nombreuses recherches à l'échelle mondiale. L'énergie solaire, en tant que source d'énergie propre et pratiquement inépuisable, devrait être efficacement exploitée, notamment via des processus photocatalytiques, pour améliorer la dépollution environnementale. Les nanomatériaux hybrides, tels que ZnO/métal noble et ZnO/oxydes métalliques, se positionnent comme des candida

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10

Migas, Jeremiah. "A PHOTOCATALYTIC INVESTIGATION OF CORE-SHELL AND HIERARCHICAL Zn-Ti-O/ZnO HETEROSTRUCTURES PRODUCED BY HYBRID HYDROTHERMAL GROWTH AND SPUTTERING TECHNIQUES." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/824.

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With an increasing demand for alternative clean energy solutions, much effort is being invested in the progression of nanoscale semiconductor materials in hopes of better harnessing solar energy. ZnO and TiO2 remain the most prominent photocatalytically active materials. This thesis reports on a comparison between nanoscale core-shell and hierarchical Zn-Ti-O/ZnO heterostructures. After a seed layer thickness optimization, hydrothermally grown ZnO nanorods were coated with mixed concentrations of Ti and Zn within an oxygen rich sputtering environment at two distinct temperature zones. Core-she

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11

Lavergne, Marie-Anne. "Synthèse et caractérisation d'oxydes mixtes de bismuth pour la photocatalyse dans le visible." Electronic Thesis or Diss., Paris 6, 2014. http://www.theses.fr/2014PA066236.

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L'objectif de ce travail est d'améliorer les performances photocatalytiques de deux oxydes mixtes de bismuth, Bi2WO6 et BiOBr, présentant une activité sous lumière visible. Leurs activités photocatalytiques sont en effet majoritairement limitées par un taux de recombinaison des charges photoinduites élevé. Deux stratégies différentes ont été respectivement appliquées pour chaque matériau. La première consiste à former une hétérostructure entre Bi2WO6 et un métal noble, le platine, pour assurer une séparation efficace des charges. La seconde consiste à réduire la taille des particules de BiOBr

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12

Ehamparam, Ramanan. "Band Edge Energetics and Charge Transfer Processes in Semiconductor-Metal Heterostructured Nanorods as Photocatalysts and Metal Oxide Electrode-Organic Semiconductor Interfaces in Organic Photovoltaics." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/566213.

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Energetics, charge selectivity and interfacial charge transfer kinetics affect the efficiency of solar electric energy conversion and solar photochemical formation of fuels. The research described herein focuses on understanding and controlling the energetics, charge selectivity, and interfacial charge transfer processes in organic photovoltaics, as well as new generation semiconductor-semiconductor and metal-semiconductor heterostructured nanorods (NRs) as photocatalysts. Waveguide and transmission based spectroelectrochemistries, photoemission spectroscopies, and impedance spectroscopy were

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13

FERNANDES, JÚNIOR Antonio de Jesus dos Santos. "ESTUDO DE MATERIAIS HETEROESTRUTURADOS FUNCIONAIS À BASE DE HIDRÓXIDOS DUPLOS LAMELARES SUPORTADOS EM SILICATO LAMELAR." Universidade Federal do Maranhão, 2017. https://tedebc.ufma.br/jspui/handle/tede/tede/1992.

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Submitted by Maria Aparecida (cidazen@gmail.com) on 2017-11-16T12:37:19Z No. of bitstreams: 1 ANTONIO DE JESUS DOS SANTOS FERNANDES JÚNIOR.pdf: 2676930 bytes, checksum: 6ea43214cce79a1ebadd7cae50663205 (MD5)<br>Made available in DSpace on 2017-11-16T12:37:19Z (GMT). No. of bitstreams: 1 ANTONIO DE JESUS DOS SANTOS FERNANDES JÚNIOR.pdf: 2676930 bytes, checksum: 6ea43214cce79a1ebadd7cae50663205 (MD5) Previous issue date: 2017-09-05<br>In this work,a nevel material heterostructured based on the assembly of double layered double hydroxide (LDH) suported in magadiite, was synthesized. For this p

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14

Kashiwaya, Shun [Verfasser], Wolfram [Akademischer Betreuer] Jaegermann, Andreas [Akademischer Betreuer] Klein, et al. "Surface science and chemical studies of NiO/single crystal TiO2 heterostructure photocatalysts / Shun Kashiwaya ; Wolfram Jaegermann, Andreas Klein, Thierry Toupance, Christina Trautmann, Martin Muhler, Valerie Keller." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1207075469/34.

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15

Kashiwaya, Shun [Verfasser], Wolfram [Akademischer Betreuer] Jaegermann, Andreas [Akademischer Betreuer] Klein, et al. "Surface science and chemical studies of NiO/single crystal TiO2 heterostructure photocatalysts / Shun Kashiwaya ; Wolfram Jaegermann, Andreas Klein, Thierry Toupance, Christina Trautmann, Martin Muhler, Valerie Keller." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1207075469/34.

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16

Cadan, Fellipe Magioli. "Otimização da síntese de nitreto de carbono grafítico e a formação de heteroestruturas com trióxido de tungstênio." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-29092017-172815/.

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Este estudo propôs uma avaliação do papel dos três principais parâmetros clássicos da síntese do nitreto de carbono grafítico: temperatura final, tempo de permanência na temperatura final e taxa de aquecimento. Realizou-se a otimização da síntese, via metodologia de superfície de resposta, usando-se como variável-resposta a degradação fotocatalítica de um poluente-modelo (tartrazina). A significância estatística dos fatores foi confirmada, com 95% de confiança. Em seguida, um modelo de segunda ordem foi ajustado às melhores respostas e, no ponto de máxima degradação, as condições foram: 6

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17

Coleto, Ubirajara Junior. "Fotoatividade de heterojunções de SrTiO3, TiO2 e CaO /." Araraquara, 2019. http://hdl.handle.net/11449/191192.

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Orientador: Leinig Antônio Perazolli<br>Resumo: O presente trabalho buscou desenvolver fotocatalisadores cerâmicos por meio da produção de heterojunções inovadoras à base de SrTiO3, TiO2 e CaO, que tiveram suas fotoatividades avaliadas pela descoloração do corante Rodamina B (RhB) e pela obtenção de biodiesel, utilizando luz ultravioleta. As amostras TiO2, CaO e SrTiO3 foram obtidas pelo método de precursores poliméricos, método Pechini, e as heterojunções TiO2/SrTiO3, CaO/SrTiO3 e CaO/CaTiO3 foram preparados por rota sol-gel. Após síntese e tratamento térmico, as amostras foram caracterizadas

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18

Lopes, Osmando Ferreira. "Heterostructure formation of BiVO4 with different Bi compounds : role of the heterojunction on photocatalytic properties." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8691.

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Submitted by Aelson Maciera (aelsoncm@terra.com.br) on 2017-04-25T17:57:49Z No. of bitstreams: 1 TeseOFL.pdf: 5276658 bytes, checksum: fa1530974731a8e33b62043b4c524afb (MD5)<br>Approved for entry into archive by Ronildo Prado (ronisp@ufscar.br) on 2017-05-02T12:15:10Z (GMT) No. of bitstreams: 1 TeseOFL.pdf: 5276658 bytes, checksum: fa1530974731a8e33b62043b4c524afb (MD5)<br>Approved for entry into archive by Ronildo Prado (ronisp@ufscar.br) on 2017-05-02T12:15:19Z (GMT) No. of bitstreams: 1 TeseOFL.pdf: 5276658 bytes, checksum: fa1530974731a8e33b62043b4c524afb (MD5)<br>Made available in DSp

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19

Ballentine, Michael Drake. "Imidazolium Ionic Liquids as Multifunctional Solvents, Ligands, and Reducing Agents for Noble Metal Deposition onto Well-Defined Heterostructures and the Effect of Synthetic History on Catalytic Performance." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/2101.

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1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM]Tf2N) was investigated as a multifunctional solvent, ligand, and reducing agent for platinum deposition onto well-defined CdSe@CdS nanorods. Platinum deposition was carried out thermally and photochemically using Pt(acac)2 as the metal precursor. Thermal deposition was investigated in [BMIM]Tf2N with and without addition of a sacrificial reducing agent, and product topology was compared with the products obtained from polyol reduction using 1,2-hexadecanediol, oleic acid, and oleylamine in diphenyl ether. Photochemically indu

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20

Eley, Clive William. "The rational design of photocatalytic semiconductor nanocrystals." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:ee29c922-857c-432a-8316-a7e04c822b1d.

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This thesis reports the successful rational design of three highly active photocatalytic semiconductor nanocrystal (SNC) systems by exploiting morphology effects and the electronic properties of type II semiconductor heterojunctions. Novel architectures of colloidal SNCs are produced with the aim of suppressing exciton recombination and improving charge extraction for the successful initiation of desirable redox chemistry. Rod-shaped niobium pentoxide Nb<sub>2</sub>O<sub>5</sub> nanocrystals (NCs) are shown to exhibit significantly enhanced activity (10-fold increase in rate constant) relative

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21

O'Connor, Timothy F. III. "Synthesis and Dynamics of Photocatalytic Type-II ZnSe/CdS/Pt Metal-Semiconductor Heteronanostructures." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1340038781.

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22

Thakur, Ramansingh V. "Magnetically Separable Ag-AgBr/Fe2O3 Heterostructured Photocatalyst for the Degradation of Dye." Thesis, 2016. http://ethesis.nitrkl.ac.in/9261/1/2016_MT_RVThakur.pdf.

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The plasmonic nanoparticles provide new opportunities for developing visible light active photocatalysts because of enhanced visible light absorption efficiency. In spite of good catalytic activity of the nanocatalyst, separation of catalyst for reuse is difficult in many catalytic applications. So, apart from the catalytic activity good separability of the catalyst is also an important issue for the economy of the process. Considering these problems, we have synthesized Ag-AgBr/Fe2O3 heterostucture by a one-pot facile route. As Fe2O3 shows ferromagnetism along with semiconductor property, syn

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23

Abdullah, Hairus, and Wang Jia Quan. "Sulfide-based Nano heterostructures for Efficient Photocatalyst." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/x896u7.

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博士<br>國立臺灣科技大學<br>材料科學與工程系<br>104<br>Photocatalysis is one of the prospective techniques to overcome the energy shortage problem and global warming. It has been used widely in many applications such as elimination of gaseous and water pollutants, self-cleaning, antibacterial materials, and water splitting. However, work on enhancing the capability of photocatalysis is ongoing because photocatalysts with high activity and reactive selectivity are required for applications. Some limitations of photocatalyst to obtain high efficiency have been found due to the fast recombination rate of photo car

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24

Uddin, Md Tamez. "METAL OXIDE HETEROSTRUCTURES FOR EFFICIENT PHOTOCATALYSTS." Phd thesis, 2014. https://tuprints.ulb.tu-darmstadt.de/4199/13/UDDIN-Second%20Revised%20PhD%20Thesis.pdf.

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Photocatalytic processes over semiconducting oxide surfaces have attracted worldwide attention as potentially efficient, environmentally friendly and low cost methods for water/air purification as well as for renewable hydrogen production. However, some limitations to achieve high photocatalytic efficiencies have been found due to the fast recombination of the charge carriers. Development of heterostucture photocatalysts by depositing metals on the surface of semiconductors or by coupling two semiconductors with suitable band edge position can reduce recombination phenomena by vectorial transf

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25

Chen, Ching-Cheng, and 陳慶成. "Heterostructured Visible Light Magnetic Photocatalysts on Dye Degradation." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/42643209940758569776.

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博士<br>國立東華大學<br>材料科學與工程學系<br>104<br>The work focuses on the two kinds of research direction of the dye degradation. First, we synthesized iron-doped TiO2 photocatalysts. The aim of the work is to study the effects of oxygen vacancy and surface hydroxyl group density on the photocatalytic activity of Fe3+-doped TiO2, and to investigate how the titanium dioxide doped with different concentration of the Fe3+ influenced their physical and chemical characterizations. The photocatalysts were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), electron spin resonance (ESR), X-

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26

Kashiwaya, Shun. "Surface science and chemical studies of NiO/single crystal TiO2 heterostructure photocatalysts." Phd thesis, 2020. https://tuprints.ulb.tu-darmstadt.de/11449/1/Dissertation_final_version_1stFeb2019.pdf.

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Photocatalysis on semiconductor metal oxide surfaces has attracted considerable attention as a sustainable environmentally friendly method for water/air purification and hydrogen production by water splitting. Among semiconducting metal oxides TiO2 has been intensively investigated as a promising photocatalyst candidate. However, despite many efforts, its photocatalytic activity is far from a practical level mainly due to inefficient charge carrier separation and resulting charge carrier recombination. An advantageous strategy to address this issue is the development of heterostructures b

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27

"The study of semiconductor heterostructures for photocatalysis and photoelectrochemical water splitting." 2015. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1292094.

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Li, Qian = 半導體异质结构在光催化和光電催化中的研究 / 李乾.<br>Thesis Ph.D. Chinese University of Hong Kong 2015.<br>Includes bibliographical references (leaves 145-162).<br>Abstracts also in Chinese.<br>Title from PDF title page (viewed on 30, December, 2016).<br>Li, Qian = Ban dao ti yi zhi jie gou zai guang cui hua he guang dian cui hua zhong de yan jiu / Li Qian.

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28

Liou, Huei Ping, and 劉慧萍. "Multiwalled carbon nanotube/graphene oxide nanoribbon heterostructures as novel photocatalysts for CO2 conversion." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/99522084464530429186.

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Liu, Wei-Ting, and 劉韋廷. "Enhanced Hydrogen Production by Controlling Oxygen Vacancies in the SnO2-x/In2O3-y Heterostructure as Photocatalyst." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2g7enw.

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博士<br>國立清華大學<br>材料科學工程學系<br>106<br>Photocatalyic water splitting with metal oxide heterostructure as photocatalysts has been a valuable and efficient hydrogen production method in recent years. Previous studies have shown that oxygen vacancies formed in photoelectrochemical reactions play an important part in the efficiency enhancement. However, the relation between the oxygen vacancy formation and the vacuum level of synthesis system has not been investigated. In this work, SnO2-x/In2O3-y heterostructures, as water splitting photocatalysts, were prepared in the synthesis systems with differen

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Chang, Cheng-Wei, and 張正偉. "Synthesis and characterization of ZnO nanowires/Ag microplates heterostructures and their enhanced photocatalysis performance." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/54012138217187266747.

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碩士<br>國立清華大學<br>材料科學工程學系<br>100<br>Ag/ZnO heterostructures are versatile materials capable of transferring interfacial charge transfer and suppressing electron-hole pairs recombination. Recently, great efforts have been made to prepare Ag/ZnO heterostructures with various morphologies such as clusters (particles-to-particles) and dendrites (wires-to-wires). We herein report a novel heterostructure of ZnO nanowire arrays growing on single crystalline polygonal Ag microplates which provides the merits of the antireflection layer for ZnO nanowire arrays and the 2D electrons transportation layer f

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Tsai, Liang-Feng, and 蔡亮峰. "Photodetector, Photocatalyst, Li Ion Battery of Sn-Se Nanomaterials, and Photocatalytic Property of SnO2/SnS2 Heterostructure Nanoflakes." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/77p8py.

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碩士<br>國立臺灣科技大學<br>材料科學與工程系<br>107<br>In this thesis, three different kinds of materials were being investigated, SnO2/SnS2 heterostructure nanoflakes, SnxSe(1-x) nanowires and SnSe2/SnSe heterostructure nanoflakes. For the first part, SnO2/SnS2 heterostructure nanoflakes was fabricated with CVD method and the composition can be controlled by adjusting the cooling time during the process. Here, four kinds of nanoflakes were being synthesized, SnO2, SnS2, SnO2/SnS2 (SnO2 rich) and SnO2/SnS2 (SnS2 rich), respectively. Afterwards, these nanoflakes were then used to photodegrade methyl blue solutio

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