Dissertations / Theses on the topic 'Metal precursor'
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Dinnage, Christopher Walker. "Molecular precursor routes to transition metal sulfides." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252054.
Full textPeters, Emily Sarah. "Precursor synthesis and chemical vapour deposition of transition metal sulfides." Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408505.
Full textMarnell, Lisa. "Adsorption of precursor molecular magnets on single crystal metal surfaces." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439490.
Full textRehermann, Carolin. "Exploring the Precursor-Process-Property Space in Metal Halide Perovskite Thin-Films." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/23095.
Full textBandgap tunability by ion substitution and the fabrication due to solution-based processes characterize metal halide perovskites. They are promising for application in various thin-film opto-electronic devices, which require the deposition of high-quality thin-films. The quality strongly depends on the crystallization behavior predetermined by the precursors in solution. This thesis aims to evaluate correlations in the vast precursor-process-property space of metal halide perovskite and rationalizes formation processes. Phase purity, morphology, and absorption properties determine the perovskite thin-film quality. The first part focuses on optimizing the perovskite fabrication to obtain high-quality films over a wide bandgap range. From high-quality films, the exciton binding energy is determined. The rationalization of formation processes proves essential to design reproducible preparation routines for high-quality films. The second part presents an optical in-situ setup to rationalize perovskite formation processes. Different formation pathways are taken, depending on the halide ratio in the MAPb(IxBr1-x)3 series. While the pure bromide forms directly and iodide-rich perovskites form via the intermediate solvate phase (MA)2(DMSO)2Pb3I8, mixed halides between 0.1 ≤ x ≤ 0.6 form via both. Such a heterogeneous formation process via two competing pathways rationalizes the compositional heterogeneity of mixed halide samples. The third part focuses on rationalizing the formation process of pure bromide perovskites and reveals a dependency of the formation kinetics on the solution concentration. Lower concentrations lead to accelerated crystallization kinetics and increase wet-film thinning. Lower colloid interaction and lower coordinated lead-bromide complexes in diluted solutions explain this trend. The strong correlation in the precursor-process-property space raises the preparation of perovskites via spin-coating to a non-trivial process from a chemical point of view.
Gao, Xiang. "Carboxylate Precursor Effects on MOD Derived Metal Oxide (Ni/NiO) Thin Films." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1331300391.
Full textDill, Kathryn Ann. "Process Optimization for the Synthesis of Gold Nanoparticles from a Mixed Metal Precursor Solution." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5326.
Full textGlatz, Christoph Johannes Germund. "From aminopyridinato complexes via metal containing SiCN precursor ceramics to heterogeneous recyclable oxidation catalysts." kostenfrei, 2009. http://opus.ub.uni-bayreuth.de/volltexte/2009/599/.
Full textRehermann, Carolin [Verfasser]. "Exploring the Precursor-Process-Property Space in Metal Halide Perovskite Thin-Films / Carolin Rehermann." Berlin : Humboldt-Universität zu Berlin, 2021. http://d-nb.info/1238073964/34.
Full textChoujaa, Hamid. "Synthesis of novel single-source precursors for CVD of mixed-metal tungsten oxide." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.478944.
Full textYu, Zexin. "Development and characterization of metal oxide semiconductor films deposited by solution precursor thermal spray process." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCA036.
Full textThe fields of research dealing with photodegradation, photocatalytic conversion of CO2 and supercapacitors are important to address environmental problems and respond to the energy crisis. Metal oxides are promising materials in these three domains. However, the conventional routes (i.e. hydrothermal, sol-gel) suffer from major deficiencies, namely their multi-step natures, their long preparation duration and small-scaled yields. Moreover, the usage of nanopowders implies a post-filtration operation at the end of the photodegradation processes and requires an additional binder in supercapacitor electrodes. In this thesis, “Solution Precursor Plasma Spray” (SPPS) and “Solution Precursor Flame Spray” (SPFS) technologies have been introduced to develop metal oxide films in view of the three aforementioned applications, benefiting from the facility and rapidity advantages of this one-step process.Firstly, to our best knowledge, it is the first time that films composed by ZnO nanostructures (e.g. nanorods, nanowires) are directly synthesized via a SPPS process. These hierarchical ZnO nanostructured films not only exhibit preferential orientation growth along the (002) crystal plane, but also feature in-situ oxygen vacancies. As a result, a possible growth mechanism of ZnO nanostructures via SPPS route was proposed.Secondly, various metal oxides composite films containing ZnO and a second metal oxide were also prepared by SPPS in an effort to narrow the energy bandgaps. In this work, not only the effect of the molar CuO/ZnO and MnO/ZnO ratio was investigated, but also laminated CuO/ZnO and CeO2/ZnO films and CuO, Co3O4 and Fe2O3 decorated ZnO nanorods films were pioneeringly deposited via this novel route.Thirdly, films involving spinel-type materials (including ZnFe2O4, NiCo2O4, ZnCo2O4 and Co3O4) were also synthesized and deposited by the SPPS and SPFS technologies, owing to their high-interest in the aforementioned applications. We found that the phase compositions are more sensitive to the Fe/Zn and Ni/Co ratios and that the surface morphologies are more dependent on the patterns of the solution injection. In addition, the power of the torch plays a more critical role on the in-situ synthesis of binary spinel phase. Besides, the SPPS route promotes the formation of flake-like particles both in the NiCo2O4 and Co3O4 films, while sphere-like particles were observed in the SPFS-prepared samples.Finally, some as-prepared films were selected to evaluate their performances within the three applications. On the one hand, Orange II was successfully (100%) degraded within 2h under UV irradiation and about 85% was removed within 6h under visible light irradiation. On the other hand, Co3O4 samples exhibited specific capacitances up to 1190 F g−1 with a retention capacity of 136% after 2500 cycles at a 20 mV/s scanning rate in 2 M KOH electrolyte. Finally, when using ZnCo2O4 as photocatalyst, CO2 was converted into CO by visible light irradiation with a maximum turnover number as high as 61.38 and a selectivity as high as 90.5 %.Overall, this work not only improves the performances of the three studied processes thanks to the use of novel, fast preparation methods, but also suggests that “Solution Precursor Thermal Spray” should be a highly promising technology for further, alternative functional applications that involve finely structured metal oxides film
Kondo, Hiroki, Shinnya Sakurai, Mitsuo Sakashita, Akira Sakai, Masaki Ogawa, and Shigeaki Zaima. "Metal-organic chemical vapor deposition of high-dielectric-constant praseodymium oxide films using a cyclopentadienyl precursor." American Institute of Physics, 2010. http://hdl.handle.net/2237/14181.
Full textSoussi, Khaled. "Precursor chemistry of novel metal triazenides : Solution and vapor phase elaborations of Fe and Al13Fe4 nanomaterials." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1006/document.
Full textPolyethylene production from the polymerization of ethylene is an industrial process of great importance. Ethylene stream for the polymerization of polyethylene is produced by the steam cracking of a wide range of hydrocarbon feedstock and usually contains acetylene impurities (1%) which poison the polymerization catalyst. The ethylene steam has to be purified by the selective semi-hydrogenation of acetylene which requires a catalyst with high selectivity to hydrogenate acetylene to ethylene. The intermetallic compound Al13Fe4 was introduced in 2012 by Armbuster et al. as an active and selective catalyst for the semi-hydrogenation of acetylene for polyethylene production. It has a crystal structure with high average inter-atomic distances Fe-Fe and a low coordination number of iron atoms, which falls under the concept of "site isolation principle". This compound is also attractive because of its low cost (without any noble metals compared to Pd/Al2O3 industrial catalysts) and low toxicity. However, it has been produced in the form of unsupported powder by the Czochralski method which limits its use in catalytic engineering. In this context, supporting the catalyst presents many advantages as the ease of separation of the heterogeneous catalyst from the reaction mixture. In contrast to homogeneous catalysts in which separation is often costly and difficult, separating the supported heterogeneous catalyst can be achieved by a variety of methods such as filtration for example. Another advantage of supported catalysts is the higher surface area of the catalyst. Since catalysis is a surface reaction, consequently, maximizing the surface area of a catalyst by distributing it over the support will enhance/optimize the catalytic activity.Chemical synthetic routes such as Metal Organic Chemical Vapor Deposition (MOCVD) and Metal Organic Deposition (MOD) referred as “Chimie douce” process are reputed to be flexible and economically competitive methods to prepare nanoparticles or thin films. Our work is thus aimed at developing Al13Fe4 as supported films or nanoparticles by MOCVD and/or MOD. The first step to meet our objective is the development of compatible molecular precursors of metallic aluminum and iron followed by MOCVD or MOD of those precursors to form the intermetallic compound in the good stoichiometry. Among the numerous aluminum MOCVD precursors used in the literature, dimethyl ethylamine alane (DMEAA, [AlH3(NMe2Et)]) is used due to its properties such as high vapor pressure and low deposition temperatures. Moreover, the absence of Al-O and Al-C bonds leads to the production of carbon and oxygen free films. However, iron molecular precursors for the MOCVD of pure iron films are scarce and less developed. Apart from iron pentacarbonyl that produces pure iron films, amidinates and guanidinates are used as iron precursors. However, oxygen and carbides impurities are present in high percentages. Thus the main objective of this Ph-D work is to design and synthesize novel and original iron molecular complexes that serve as precursors for the low temperature MOCVD of iron films. In this Ph-D work, nanoparticles of the intermetallic complex were prepared via solution reduction of novel Fe triazenide precursors and Al metal. Supported films were also prepared via sequential MOCVD by using DMEAA and Fe(CO)5 as molecular precursors. Its catalytic properties have been explored and showed that it is very little active in the hydrogenation reaction of acetylene. Regeneration under hydrogen or oxygen was not very successful and only some activity restored. The catalytic tests have been further extended to Al13Fe4 powder prepared by solution reduction as well as to commercial Al13Fe4 and found that Al13Fe4 was inactive catalytically in all forms (in our conditions of reactions)
Parala, Harish. "Precursor routes to selected metal and semiconductor nanomaterials crystals, composites, colloids of Au, GaN, InN, CdSe and TiO₂ /." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=96870901X.
Full textParala, Harish. "Precursor routes to selected metal and semiconductor nanomaterials crystals, composites, colloids of Au, GaN, InN, CdSe and TiO2 /." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=96870901X.
Full textSen, Selda. "Activity Of Carbon Supported Platinum Nanoparticles Catalysts Toward Methanol Oxidation Reaction: Role Of Metal Precursor And A New Surfactant." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609273/index.pdf.
Full text#61566
342 A/gPt at 0.612 V) towards methanol oxidation reaction while Catalyst IIIb (H2PtCl6 and 1-hexanethiol were used to prepare this catalyst) has the minimum activity (&
#61566
91A/gPt at 0.580V). XRD, TEM and XPS results indicated that the optimum catalyst for methanol oxidation reaction contains about 3 nm of platinum nanoparticles, adsorbed hydroxide and water on the surface of catalyst, but sulphur. These results are in agreement with the proposed mechanism.
Zhou, Cong [Verfasser], Ralf [Akademischer Betreuer] Riedel, and Zhaoju [Akademischer Betreuer] Yu. "Ternary Si-Metal-N Ceramics: Single-Source-Precursor Synthesis, Nanostructure and Properties Characterization / Cong Zhou ; Ralf Riedel, Zhaoju Yu." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1130323242/34.
Full textKim, Jiyeon [Verfasser], Roland A. [Gutachter] Fischer, and Anjana [Gutachter] Devi. "Organometallic chemistry of transition metal-group 13 complexes and metal-organic precursor synthesis for ALD cobalt oxide thin films / Jiyeon Kim ; Gutachter: Roland A. Fischer, Anjana Devi." Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1144613949/34.
Full textDenmeade, Joshua J. "Investigation of Novel Precursor Routes for Incorporation of Oxynitride Spinel Phases into Ceramic-Metallic Composites Formed via the TCON Process." Youngstown State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1391684337.
Full textAbdelhady, Ahmed Mohammed Said lutfi. "Developing novel processes in chemistry for several types of nanoparticles." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/developing-novel-processes-in-chemistry-for-several-types-of-nanoparticles(0712d3c6-e2d5-415a-b787-c9ce457e1355).html.
Full textRamunno, Monica V. "Preparation and Characterization of Spinel-based Interpenetrating Phase Composites via Transformation of 3-D Printed Precursor Shapes." Youngstown State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1472555655.
Full textDumbrell, Kathy. "Athlone in the early twentieth century - a precursor to working class housing on the Cape Flats, 1900-1930." Bachelor's thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/5607.
Full textThe initial work for this project was a photographic survey of the existing wood and iron buildings in Athlone. I was at the time a volunteer in the Urban Conservation Unit of the Cape Town City Council (hereafter UCU). My task was to docment the existing wood-and-iron buidlings in order to aid later development control decision-making. to a large extent, it was the results of the fieldwork, which both uncovered a need for further research and directed later archival and textual research.
Brazda, Petr. "Preparation of Fe2O3/SiO2 nanocomposites from molecular precursor by the sol-gel method and the doping of iron (III) by trivalent metal cations." Strasbourg, 2009. http://www.theses.fr/2009STRA6289.
Full textPresented work is focused on preparation of nanocomposite of epsilon-Fe2O3 crystallites embedded in amorphous SiO2 matrix using new sol-gel technique. Another aim of our study was to prepare epsilon iron(III) oxide with part of iron atoms substituted by diamagnetic aluminium or gallium atoms. From this reason nanocomposites of compositions of Al0. 25Fe1. 75O3/SiO2, Al0. 50Fe1. 50O3/SiO2, Al0. 75Fe1. 25O3/SiO2, Ga0. 25Fe1. 75O3/SiO2, Ga0. 50Fe1. 50O3/SiO2 and Ga0. 75Fe1. 25O3/SiO2 were prepared. Thanks to the optimal conditions, the non-substituted samples prepared were very pure. The majority of substituted samples did not contain other than epsilon phase. The anisotropy of hyperfine fields at 4. 2 K observed by NMR spectroscopy led to an alternative assignment of the subspectra in Mössbauer spectrum of epsilon phase. Fine structure of Mössbauer spectra induced by the substitution permitted a deeper understanding of the relationship between structure and magnetic properties of epsilon-Fe2O3
Myers, Kyle M. "Investigation of Novel Precursor Routes for Incorporation of Titanium Alloys and Nano-Sized Features into Ceramic-Metallic Composites Formed via the TCON Process." Youngstown State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1365507702.
Full textDu, Guodong. "Group 4 Metalloporphyrin diolato Complexes and Catalytic Application of Metalloporphyrins and Related Transition Metal Complexes." Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/835301-irsXCw/webviewable/.
Full textErbe, Manuela, Jens Hänisch, Thomas Freudenberg, Anke Kirchner, Stefan Kaskel, Ingolf Mönch, Ludwig Schultz, and Bernhard Holzapfel. "Improved REBa₂Cu₃O₇₋ₓ (RE ═ Y, Gd) structure and superconducting properties by addition of acetylacetone in TFA-MOD precursor solutions." Royal Society of Chemistry, 2014. https://tud.qucosa.de/id/qucosa%3A36162.
Full textYoung, Kay. "Mixed metal alkoxides as catalyst precursors." Thesis, Durham University, 1989. http://etheses.dur.ac.uk/6528/.
Full textMcAtamney, Karen Marie. "Transition metal aryloxides as ferrite precursors." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326372.
Full textCatherall, Amanda Louise. "(Thio)amidate precursors to metal chalcogenides." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760913.
Full textRamasamy, Karthik. "New molecular precursors for metal sulfides." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/new-molecular-precursors-for-metal-sulfides(49bcd8c0-4a37-4eb1-892e-7a7973f8f3cd).html.
Full textFan, Haibo. "HfC structural foams synthesized from polymer precursors." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Dissertation/FAN_HAIBO_30.pdf.
Full textVeitch, Charles D. "The preparation of polycrystalline mixed-metal oxide phases from metal-organic precursors." Thesis, Glasgow Caledonian University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335019.
Full textMarsh, Patrica Ann. "Metal complexes as precursors for film deposition processes." Thesis, Open University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262973.
Full textLinney, Rachel E. "The laser powered pyrolysis of metal deposition precursors." Thesis, University of Leicester, 1993. http://hdl.handle.net/2381/33788.
Full textHayward, James. "Supported metal catalysts for the production of chemical precursors." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/53589/.
Full textKamada, Rui. "Copper(indium,gallium)selenide film formation from selenization of mixed metal/metal-selenide precursors." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 226 p, 2009. http://proquest.umi.com/pqdweb?did=1654501631&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textTrindade, Tito Da Silva. "The synthesis of metal chalcogenide nanocrystallites using single molecule precursors." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363125.
Full textHermans, S. "Mixed-metal clusters as precursors for bimetallic supported nanoparticle catalysts." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603977.
Full textTobin, Neil Lawrence. "Improved precursors for the chemical vapour deposition of metal oxides." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417972.
Full textOgrodnik, Virginie. "Silver complexes having potential as precursors for metal film deposition." Thesis, University of Bath, 1998. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284402.
Full textRichards, Stephen Paul. "Imidazolium salts as convenient precursors to novel metal-carbene complexes." Thesis, University of Bath, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413916.
Full textEnderle, Bryan Anthony. "Bridging the gaps in catalysis : novel metal complexes as zeolite probes and metal cluster precursors /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.
Full textBarstow, Sean J. "Use of photosensitive metal-organic precursors to deposit metal-oxides for thin-film capacitor applications." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04082004-180015/unrestricted/barstow%5Fsean%5Fj%5F200312%5Fphd.pdf.
Full textEzenwa, Emmanuel. "N,N-diethyl-N'-naphthoylacylchalcogourea to metal (II)complexes as precursors for ternary metal chalcogenide thin films via AACVD." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/nndiethylnnaphthoylacylchalcogoureatometal-iicomplexes-as-precursors-for-ternary-metal-chalcogenide-thin-films-via-aacvd(85420a4c-89d4-4465-9734-ca40a75ba924).html.
Full textRedshaw, Carl. "Oxo and organoimido precursors for non-aqueous polytungstate synthesis." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328135.
Full textPearce, Amber Marie. "Synthesis and characterisation of metal chalcogenide thin films." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/synthesis-and-characterisation-of-metal-chalcogenide-thin-films(7a22c662-639c-4aaf-a4cc-f2ae655115c0).html.
Full textVenable, Margaret Hamm. "Syntheses, structures and support interactions of potential metal oxide catalyst precursors." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/26940.
Full textKeeble, Andrew David. "Studies on metal alkoxides and carboxylates for use as catalyst precursors." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6181/.
Full textRubiano, Rodrigo R. (Rubiano Ray). "Low temperature deposition of metal carbide films from single source precursors." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/34692.
Full textIncludes bibliographical references (leaves 71-73).
by Rodrigo R. Rubiano.
B.S.
M.S.
Ashworth, Andrew Paul. "FTIR study of the thermolysis of some MOCVD precursors." Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315078.
Full textMendoza-Espinosa, Daniel. "Synthesis and characterization of metallocalixarenes as precursors for the SOHIO model catalyst." [Fort Worth, Tex.] : Texas Christian University, 2009. http://etd.tcu.edu/etdfiles/available/etd-10162009-104543/unrestricted/Mendoza-Espinosa.pdf.
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