Dissertations / Theses on the topic 'Single precursor synthesis'
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Choujaa, 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.
Bera, A. "Scalable Synthesis of dispersible semiconducting metal chalcogenides nanocrystals and their application." Thesis(Ph.D.), CSIR-NCL, 2021. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/6030.
The work incorporated in this thesis is mainly focused on various single source metal precursors like metal thiolates and metal dithiocarbamate complexes. Herein, several simple and general methods have been developed for the synthesis of various such single source metal precursors, which comprising the main two constituents of metal chalcogenide nanocrystals (NCs), namely, the tiny inorganic metal chalcogenide complex as core and an organic molecule as shell. Specially, both binary metal thiolates and bimetallic (ternary) thiolates have been prepared and both of them turned out to be excellent precursors for the synthesis of metal sulfide/selenide NCs. The methods used to prepare metal chalcogenide NCs included a direct-heating (solvo-thermal decomposition) method or solid state grinding method. First, the large scale synthesis of various 2D molecular precursors like metal thiolates and metal dithiocarbamate complexes (M-C8DTCA) have been developed and studied their thermal decomposition to metal sulfide NCs via solution based methods. We observed that some of the metal thiolates like Pb-thiolate requires very high temperature to decompose into PbS resulting in particles bigger than their Bohr exciton radius and hence displayed poor optical properties. In the next, to reduce the decomposition temperature an active sulfur precursor called octyl ammonium octyldithiocarbamate (C8DTCA) has been utilized for the synthesis of various metal sulfide NCs (including most challenging PbS NCs, with tunable optical properties) by solution based method (hot injection) or solid state grinding method. We also show that the size of the nanocrystals could be controlled by changing the reaction temperature or metal: chalcogenide precursor ratio. Interestingly, we have also been successful in establishing that these newly developed solid state grinding methods are scalable without compromising their structural and optical properties. The binary or ternary materials synthesized by these solid state routes could be re-dispersed as desired in non-polar organic solvents allowing them to be solution processible. The optical properties of the metal chalcogenide nanocrystals could further be improved by post synthetic surface passivation.
CSIR-NCL
AcSIR
Abdelhady, 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.
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.
Kaur, Sarabjeet [Verfasser], Ralf [Akademischer Betreuer] Riedel, and Sanjay [Akademischer Betreuer] Mathur. "Single-Source-Precursor Synthesis of SiC-Based Ceramic Nanocomposites for Energy-Related Applications / Sarabjeet Kaur. Betreuer: Ralf Riedel ; Sanjay Mathur." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2016. http://d-nb.info/1112269851/34.
Wen, Qingbo [Verfasser], Ralf [Akademischer Betreuer] Riedel, and Zhaoju [Akademischer Betreuer] Yu. "Single-Source-Precursor Synthesis and Properties of SiMC(N) Ceramic Nanocomposites (M = Hf, Ta, HfTa) / Qingbo Wen ; Ralf Riedel, Zhaoju Yu." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1130323250/34.
Yuan, Jia [Verfasser], Ralf [Akademischer Betreuer] Riedel, and Zhaoju [Akademischer Betreuer] Yu. "SiHf(B)CN-based ultra-high temperature ceramic nanocomposites: Single-source precursor synthesis and behavior in hostile environments / Jia Yuan. Betreuer: Ralf Riedel ; Zhaoju Yu." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/111191138X/34.
Liu, Xingmin [Verfasser], Ralf [Akademischer Betreuer] Riedel, and Nahum [Akademischer Betreuer] Travitzky. "Single-Source-Precursor Synthesis and Electromagnetic Properties of SiCN-Based Ceramic Nanocomposites Modified with Carbon Nanofillers from 1D CNTs to 3D RGO/CNTs / Xingmin Liu ; Ralf Riedel, Nahum Travitzky." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/116930530X/34.
Trindade, 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.
Pearce, 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.
Mileham, John David. "Synthesis and charaterisation of single-source precursors to metal chalcogenides and pnictides." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398838.
Cosham, Samuel. "Synthesis and characterisation of single-source CVD precursors for M-N-Si composites." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518287.
Akhtar, Masood. "Synthesis of iron chalcogenide nanocrystals and deposition of thin films from single source precursors." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/synthesis-of-iron-chalcogenide-nanocrystals-and-deposition-of-thin-films-from-single-source-precursors(1f2ca1fd-da28-4da8-95a4-7bba81c8b1c6).html.
Nqombolo, Azile. "Synthesis and structural studies of NiS and PdS nanoparticles/nanocomposites from dithiocarbamates single source precursors." Thesis, University of Fort Hare, 2016. http://hdl.handle.net/10353/d1021326.
Stanley, Joanne Elizabeth. "The synthesis of novel single source precursors for the CVD of fluorine-doped tin oxide." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362263.
Singh, Sanjay. "Monomeric organo-aluminum and gallium monohydroxides as precursor for homo- and heterobimetallic oxides synthetic, reactivity and structural investigations including gold(I) N-heterocyclic carbene complexes /." [S.l.] : [s.n.], 2006. http://webdoc.sub.gwdg.de/diss/2006/singh.
Galiyeva, Perizat. "Doped Ag-In-Zn-S and Ag-In-Ga-Zn-S QDs : synthesis and potential as dual-modality probes for magnetic resonance and fluorescence imaging of cells." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0118.
Since fluorescence imaging (FI) and magnetic resonance imaging (MRI) are among the most effective diagnostic tools, QDs with fluorescent and magnetic properties are of great interest as dual-modal probes. In this work, undoped and doped Ag-In-Zn-S (AIZS) and Ag-In-Ga-Zn-S (AIGZS) QDs were synthesized and investigated as bimodal probes for FI and MRI. Highly fluorescent AIZS QDs were prepared in organic media using DDT and OAm as capping ligands. Mn:AIZS QDs showed paramagnetic and superparamagnetic properties. AIZS and Mn:AIZS QDs were also transferred into aqueous phase using the amphiphilic PMAO polymer. Further, Mn, Gd or Fe-doped AIZS QDs were prepared in aqueous media, showed low cytotoxicity toward KB cells, and demonstrated potential as fluorescent probes for FI. Finally, AIGZS and Mn:AIGZS QDs, synthesized via a novel single precursor thermal decomposition method, showed high fluorescence and paramagnetic/superparamagnetic properties. Mn-doped aqueous transferred AIGZS QDs increased contrast in both T1-weighted and T2-weighted images with increasing in Mn loading
Mensinger, Zachary Lee 1982. "Synthesis and characterization of tridecameric Group 13 hydroxide clusters." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/11300.
In the research area of Group 13 hydroxide clusters, progress is often hampered by difficult and inefficient synthetic procedures. This has greatly limited the numerous potential applications of Group 13 hydroxide compounds, many of which require large amounts of material. Most relevant to this dissertation is their application as precursors for high quality amorphous metal oxide thin films. Addressing this issue, this dissertation presents a series of Group 13 containing hydroxide compounds of general formula [M 13 (μ 3 -OH) 6 (μ-OH) 18 (H 2 O) 24 ](NO 3 ) 15 which are generated through an efficient, scalable synthetic procedure. Throughout this dissertation, the compounds are generally referred to by their metal content, i.e. [Ga 13 (μ 3 -OH) 6 (μ-OH) 18 (H 2 O) 24 ](NO 3 ) 15 is designated as Ga 13 . Chapter I reviews the literature of inorganic and ligand-supported Group 13 hydroxide compounds with the aim of identifying common structural trends in metal composition and coordinating ligands. This summary is limited to clusters of aluminum, gallium, and indium. Chapter II describes in detail the synthesis and characterization of one such cluster, Al 13 . Following this in Chapter III is the description of the first heterometallic Group 13 hydroxide compound, Ga 7 In 6 , which along with Ga 13 was used as a precursor material for metal oxide thin films in collaboration with Professor Doug Keszler at Oregon State University. Chapter IV describes a series of six Ga/In compounds, as well as two Al/In compounds. Included in this chapter is an analysis of the heat-induced decomposition properties of the Ga/In clusters. Understanding such thermal decomposition is particularly relevant for the use of these compounds as precursor materials, as an annealing step is used to condense the films. Chapter V addresses the potential for post-synthetic modification of the compounds through metal and ligand exchange reactions, an area that also addresses the issue of solution stability of the structures Chapter VI describes the synthesis and characterization of related Group 13 compounds, including two infinite chain structures and additional heterometallic compounds. Lastly, Chapter VII concludes this dissertation and discusses potential areas of future research. This dissertation includes co-authored material and previously published results.
Committee in charge: Victoria DeRose, Chairperson, Chemistry; Darren Johnson, Member, Chemistry; James Hutchison, Member, Chemistry; Michael Haley, Member, Chemistry; Raghuveer Parthasarathy, Outside Member, Physics
Bruce, Jocelyn Catherine. "Use of the N,N-dialkyl-N’-benzoyl(thio)selenoureas as single source precursors for the synthesis of semiconducting quantum dots." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1205.
The successful preparation and structural characterization of a number of N,N-dialkyl-N’-benzoyl(thio)selenourea ligands is described; where the intermolecular interactions are characterized by the presence of Resonance Assisted Hydrogen Bonding (RAHB), π- π interactions between neighbouring benzene residues only being evident amongst the longer alkyl chain derivatives. The first structural characterization of an asymmetrically substituted N,N-dialkyl- N’-benzoylselenourea ligand reveals an increased stability of the Z isomer in the solid state, this being reflected by the sulfur analogue. Attempts to synthesise N,N-dicyclohexyl-N’-benzoylselenourea led to the isolation and structural characterization of a novel 1,3,5-oxaselenazine salt and dicyclohexylaminobenzoate. The first structural characterization of a “bipodal” N,N-dialkyl-N’-benzoylselenourea ligand, 3,3,3’,3’-tetrabutyl-1,1’- isophthaloylbis(selenourea), reveals RAHB in the crystal lattice similar to that exhibited by the “monopodal” analogue, N,N-dibutyl-N’-benzoylselenourea. The successful complexation of the N,N-dialkyl-N’-benzoyl(thio)selenourea ligands to a number of different transition metal ions is reported allowing the preparation of several potential single source precursors. Coordination through the O and Se/S donor atoms to Pd(II) results in the formation of square planar metal complexes, with a cis conformation, several of which could be structurally characterized. In particular, the first structural elucidation of an asymmetrically substituted N,N-dialkyl-N’-benzoylselenourea metal complex, cis-bis(N-benzyl-N-methyl-N’- benzoylselenoureato)palladium(II) indicates the increased stability of the EZ isomer in the solid state. Structural elucidation of the novel (N,N-diphenyl-N’-benzoylselenoureato)cadmium(II) reveals a bimetallic complex in the solid state, where the expected 2:1 ligand : metal ratio is maintained, and the two Cd(II) centres are 5 and 6 coordinated, with O and Se donor atoms. Multinuclear Nuclear Magnetic Resonance (NMR) Spectroscopy has been employed in the thorough characterisation of the potential single source precursors, 77Se NMR spectroscopy indicating a decreased shielding of the 77Se nucleus as the “hardness” of the central metal ion increases i.e. Pd(II) > Zn(II) > Cd(II). Use of 113Cd NMR spectroscopy indicates the preferential binding of N,N-diethyl-N’- benzoylselenourea to Cd(II) over that of its sulfur analogue, and initial studies suggest a form of chelate metathesis taking place in solution. 31P NMR spectroscopy is used to gain insight into the formation of cis-bis(N,N-diethyl-N’- benzoylselenoureato)Pt(II). Thermolysis of (N,N-diethyl-N’-benzoylselenoureato)cadmium(II) and its sulfur analogue led to the successful synthesis of CdSe and CdS quantum dots respectively, where thermolysis over a range of temperatures allows a degree of size control over the resulting nanoparticles. The effect of precursor alkyl chain length on nanoparticle morphology was investigated for both the N,N-dialkyl-N’-benzoylthio- and –selenoureas. A correlation between the two for the (N,N-dialkyl-N’-benzoylselenoureato)Cd(II) complexes is described and possible growth mechanisms are discussed. Preliminary investigations into the use of other N,N-dialkyl-N’-benzoyl(thio)selenourea metal complexes as single source precursors reveal that both (N,N-diethyl-N’-benzoylselenoureato)Zn(II) and its sulfur analogue show potential as single source precursors for the formation of ZnO and ZnS nanoparticles respectively. Initial studies into the use of N,N-dialkyl-N’-benzoyl(thio)selenourea metal complexes as single source precursors for the synthesis of core-shell nanoparticles is briefly described. The Aerosol Assisted Chemical Vapour Deposition (AACVD) of several N,N-dialkyl-N’-benzoyl(thio)selenourea metal complexes is reported, where both (N,N-diethyl-N’-benzoylselenoureato)Cd(II) and its sulfur analogue allow the deposition of crystalline CdSe and CdS respectively. The AACVD of (N,N-diethyl-N’- benzoylselenoureato)Zn(II) leads to the deposition of crystalline ZnSe, ZnS being deposited by (N,N-diethyl-N’-benzoylthioureato)Zn(II). The deposition of heazelwoodite (Ni3S2) with varying morphologies results from the AACVD of cis-bis(N,N-diethyl-N’-benzoylthioureato)Ni(II). Thermal annealing of the amorphous material deposited by the AACVD of cis-bis(N,N-diethyl-N’-benzoylthioureato)Pd(II), allows the formation of highly crystalline palladium. The deposition of metallic platinum using cis-bis(N,N-diethyl-N’-benzoylthioureato)Pt(II) is described as well as the deposition of crystalline Pd17Se15 from cis-bis(N,N-diethyl-N’-benzoylselenoureato)Pd(II). This, to the best of our knowledge, is the first time that AACVD has been performed, using the N,N-dialkyl-N’- benzoyl(thio)selenourea metal complexes as single source precursors, in addition, we believe it to be the first time that palladium selenide has been deposited using the AACVD technique.
Tsaroucha, Marianna [Verfasser], and Matthias [Akademischer Betreuer] Driess. "Beiträge zur Synthese von Sn/Zn-Alkoxiden als Single Source Precursoren zur Herstellung von dünnen transparenten und halbleitenden Oxidschichten / Marianna Tsaroucha. Betreuer: Matthias Driess." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2013. http://d-nb.info/1034420976/34.
Meyer, Daniela [Verfasser], and Manfred [Akademischer Betreuer] Scheer. "Investigations on the synthesis of silicon-arsenic double bonds and the preparation of MxEy nanoparticles from single-source-precursors (M = Ga, Ge, Sn; E = P, As) / Daniela Meyer ; Betreuer: Manfred Scheer." Regensburg : Universitätsbibliothek Regensburg, 2020. http://d-nb.info/1210728907/34.
Kaur, Sarabjeet. "Single-Source-Precursor Synthesis of SiC-Based Ceramic Nanocomposites for Energy-Related Applications." Phd thesis, 2016. https://tuprints.ulb.tu-darmstadt.de/5601/1/Sarabjeet%20Kaur-Dissertation.pdf.
Zhou, Cong. "Ternary Si-Metal-N Ceramics: Single-Source-Precursor Synthesis, Nanostructure and Properties Characterization." Phd thesis, 2017. https://tuprints.ulb.tu-darmstadt.de/6145/1/ZHOU%20Cong%E2%80%98s%20Ph.D.%20thesis%20final.pdf.
Wen, Qingbo. "Single-Source-Precursor Synthesis and Properties of SiMC(N) Ceramic Nanocomposites (M = Hf, Ta, HfTa)." Phd thesis, 2017. https://tuprints.ulb.tu-darmstadt.de/6146/1/PhD-2017-04-11-Qingbo%20Wen.pdf.
Schmitt, Andrew Lee. "Synthesis and characterization of silicide nanowire materials using chemical vapor deposition of single source precursor molecules /." 2009. http://www.library.wisc.edu/databases/connect/dissertations.html.
Yuan, Jia. "SiHf(B)CN-based ultra-high temperature ceramic nanocomposites: Single-source precursor synthesis and behavior in hostile environments." Phd thesis, 2015. https://tuprints.ulb.tu-darmstadt.de/5007/1/Thesis-J%20Yuan-DF%20TU%20Darmstadt-2015.pdf.
Liu, Xingmin. "Single-Source-Precursor Synthesis and Electromagnetic Properties of SiCN-Based Ceramic Nanocomposites Modified with Carbon Nanofillers from 1D CNTs to 3D RGO/CNTs." Phd thesis, 2018. https://tuprints.ulb.tu-darmstadt.de/8098/1/PhD%20dissertation%20of%20Xingmin%20Liu-After%20defense-Final.pdf.
"Synthesis, characterization, and functionalization of transition metal phosphide nanomaterials from single source molecular precursors." Thesis, 2010. http://hdl.handle.net/1911/62022.
Chen, Yu-Hsin, and 陳昱先. "Synthesis of ZnS and CdS Nanowires with Single-Source-Precursors via Solution-Solid-Solid Mechanism." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/81352252247296397824.
Sibokoza, Simon Bonginkosi. "Synthesis and characterization of cobalt and copper sulfide nanoparticles with reproducible stoichiometry using sulfur containing single-source precursors." Thesis, 2012. http://hdl.handle.net/10352/267.
Complexes of alkyldithiocarbamate and thiuram have been extensively explored for various applications in the medical field. Thiuram and dithiocarbamate ligands were used to prepared complexes of cobalt and copper. The high abundance of sulfur in these ligands has resulted to be the preferred complexes for the synthesis of metal sulfide nanoparticles. All the prepared complexes were characterized using techniques such as IR and 1HNMR spectroscopy, elemental analysis, and thermogravimetric analysis. All the spectra data obtained were consistent with the coordination of the ligands through sulfur atom to the metal ion. The thermogravimetric analysis of all complexes decomposed to form metal sulfide, which really confirmed that all the complexes could be used to metal sulfide nanoparticles. All the prepared complexes were used to synthesize MxSy nanoparticles. The metal sulfide nanoparticles were successful prepared by thermal decomposition of the single-source precursor in hexadecylamine solution. The reaction parameter such as the concentration (1.0, 0.5, 0.25 and 0.125 g), reaction temperature (80, 130, 200, 250 °C) and the time (5, 10, 15, 20, 25 and 30) of the reactionwere varied to see their effect on the preparation of the nanoparticles. The prepared metal sulfide nanoparticles were characterized using techniques such as UV spectroscopy, photoluminescence spectroscopy, X-ray diffraction analysis and transmission electron microscopy. The concentration was found to have a profound effect in size and shape of the prepared nanoparticles. The nanoparticles prepared at various concentrations were dominated by sphere with an average size of 2-30 nm. The XRD pattern confirmed that the composition is not affected by the temperature. Thetemperature has a dramatic effect in size, shape and the stoichiometry of the reaction. This was confirmed by an increase in size as the temperature was increased, with the exception of cobalt sulfide nanoparticles that decrease in size while temperature was increase. The XRD pattern showed different composition as the temperature was varied. Time of the reaction was found to affect the particles size of the nanoparticle. The sizes of the nanoparticles were increase as the time of the reaction was prolonged.
"Synthesis and characterization of anisotropic cadmium and lead sulfide nanostructures from single source molecular precursors and an insight to their growth mechanisms." Thesis, 2010. http://hdl.handle.net/1911/62042.
Liu, Shu-Hao, and 劉書豪. "1. Syntheses and Characterizations of Copper(I) Complexes R3SnCu(PR’3)n. ; 2. CVD of Fe/Sn Alloy Films from Single-Source Precursor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/99233851842645110917.
國立中正大學
化學研究所
88
There are two parts in this thesis. 1. The syntheses of various copper(I) complexes are best illustrated by following examples. The compounds R3SnCu(PR’3)n, where R = Ph, Me; R’ = Me, Et, Ph and n = 3, have been synthesized by the reaction of R3SnNa with CuCl and three equivalent of the PR’3, or by the reaction of R3SnNa with CuCl(PPh3)3. All of these products were characterized by 1H NMR, 13C NMR and 31P NMR spectroscopies. There are three phosphine molecules bonding with the Cu atom. The series of Ph3Sn- complexes are thermal stable at ambient temperature, but the series of Me3Sn- complexes decompose at room temperature. All of these products are not suitable for chemical vapor deposition, because they can not be sublimated. 2. cis-Fe(CO)4(SnMe3)2 has been examined as single-source precursor for low-pressure chemical vapor deposition in cold-wall reactor. Fe/Sn alloy thin films were obtained at 240~420℃. XRD indicated only FeSn pattern at 240℃, FeSn2 pattern appeared above 270℃, FeSn pattern disappeared at 300℃ and FeSn pattern appeared gradually above 330℃. These films have been characterized and analyzed by SEM, EDS, EPMA, ESCA, AES and AA. The results indicated that these are Fe/Sn alloy thin films. The deposition rate and grain size increase with increasing temperature. The deposition rates are 40~330 Å/min. The grain sizes are 0.2~2.0 m.
Erk, Christoph [Verfasser]. "Anwendungen von Single-Source-Precursoren und porösem anodischem Aluminiumoxid in der Synthese anorganischer Nanostrukturen / vorgelegt von Christoph Erk." 2010. http://d-nb.info/1007856386/34.
Bender, Michael [Verfasser]. "Synthese neuartiger Single-Source-Precursoren für die Abscheidung piezoelektrischer Bleizirkonattitanat(PZT)-Schichten mittels chemischer Gasphasenabscheidung (CVD) / von Michael Bender." 2010. http://d-nb.info/1004161565/34.