Vapor Phase Synthesis of II-IV Semiconductor Nanoparticles in a Counterflow Jet Reactor

2000 ◽  
Vol 616 ◽  
Author(s):  
D. Sarigiannis ◽  
J.D. Peck ◽  
T.J. Mountziaris ◽  
G. Kioseoglou ◽  
A. Petrou
Keyword(s):  
Vapor Phase ◽  
Room Temperature ◽  
Steady State Mode ◽  
Znse Nanoparticles ◽  
Phase Synthesis ◽  
The Past ◽  
Transmission Electron ◽  
Vapor Phase Synthesis ◽  
Znse Thin Films ◽  
Counterflow Jet Reactor

AbstractThe vapor-phase synthesis of polycrystalline ZnSe nanoparticles is reported. The particles were grown at room temperature and at a pressure of 125 torr in a counterflow jet reactor and were collected by impact on a Si watler. The precursors used in this study were vapors of (CH3)2Zn:[N(C2H5)3)]2 and H2Se gas diluted in hydrogen. These precursors have been used in the past for Metalorganic Vapor Phase Epitaxy (MOVPE) of ZnSe thin films. The particles were characterized by Transmission Electron Microscopy (TEM). electron diffraction. and Raman spectroscopy. The reactor was operated in a continuous, steady-state mode using a gas delivery system that is typical flor MOVPII systems.

Vapor phase synthesis of Al-doped titania powders

1994 ◽  
Vol 9 (5) ◽  
pp. 1241-1249 ◽  
Author(s):  
Kamal M. Akhtar ◽  
Sotiris E. Pratsinis ◽  
Sebastian V.R. Mastrangelo
Keyword(s):  
Vapor Phase ◽  
Flow Reactor ◽  
Particle Surface ◽  
Particle Morphology ◽  
High Concentration ◽  
Phase Synthesis ◽  
Transmission Electron ◽  
Significant Enrichment ◽  
Vapor Phase Synthesis ◽  
Doped Titania

The role of aluminum as dopant in gas phase synthesis of titania powders was experimentally investigated in an aerosol flow reactor between 1300 and 1700 K. Titania was produced by vapor phase oxidation of titanium tetrachloride in the presence of dopant aluminum trichloride vapor. The presence of aluminum altered the particle morphology from polyhedral to irregular crystals. Energy dispersive analysis and transmission electron microscopy indicated that the powders were mixtures of crystalline titania and amorphous alumina. Analysis by XPS indicated significant enrichment of aluminum on the particle surface. Some aluminum titanate (up to 17% by volume) was formed at 1700 K when a high concentration of AlCl3 was used (AlCl3/TiCl4 ≥ 0.07). Measurements of lattice parameters by x-ray diffraction indicated that aluminum formed a solid solution in titania. While titania synthesized in the absence of aluminum was about 90% anatase, the introduction of aluminum resulted in pure rutile at AlCl3/TiCl4 = 0.07. The effects of aluminum on titania phase composition and morphology are explained by the creation of oxygen vacancies in the titania crystallites and by the enhancement of the sintring rate of titania grains.

Vapor-phase synthesis and characterization of ZnSe nanoparticles

2002 ◽  
Vol 12 (4) ◽  
pp. 99-105
Author(s):  
D. Sarigiannis ◽  
R. P. Pawlowski ◽  
J. D. Peck ◽  
T. J. Mountziaris ◽  
G. Kioseoglou ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Synthesis And Characterization ◽  
Znse Nanoparticles ◽  
Phase Synthesis ◽  
Vapor Phase Synthesis

scholarly journals Vapor Phase Synthesis of Organometal Halide Perovskite Nanowires for Tunable Room-Temperature Nanolasers

Nano Letters ◽  
2015 ◽  
Vol 15 (7) ◽  
pp. 4571-4577 ◽  
Author(s):  
Jun Xing ◽  
Xin Feng Liu ◽  
Qing Zhang ◽  
Son Tung Ha ◽  
Yan Wen Yuan ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Room Temperature ◽  
Phase Synthesis ◽  
Organometal Halide Perovskite ◽  
Halide Perovskite ◽  
Vapor Phase Synthesis

Vapor-phase synthesis of metallic and intermetallic nanoparticles and nanowires: Magnetic and catalytic properties

2006 ◽  
Vol 78 (9) ◽  
pp. 1667-1689 ◽  
Author(s):  
Garry Glaspell ◽  
Victor Abdelsayed ◽  
Khaled M. Saoud ◽  
M. Samy El-Shall
Keyword(s):  
Cobalt Oxide ◽  
Vapor Phase ◽  
Room Temperature ◽  
Catalytic Properties ◽  
Blocking Temperature ◽  
Laser Vaporization ◽  
Metal Catalyst ◽  
Phase Synthesis ◽  
Oxide Support ◽  
Vapor Phase Synthesis

In this paper, we present several examples of the vapor-phase synthesis of intermetallic and alloy nanoparticles and nanowires, and investigate their magnetic and catalytic properties. In the first example, we report the vapor-phase synthesis of intermetallic aluminide nanoparticles. Specifically, FeAl and NiAl nanoparticles were synthesized via laser vaporization controlled condensation (LVCC) from their bulk powders. The NiAl nanoparticles were found to be paramagnetic at room temperature, with a blocking temperature of approximately 15 K. The FeAl nanoparticles displayed room-temperature ferromagnetism. In the second example, we report the vapor-phase synthesis of cobalt oxide nanoparticle catalysts for low-temperature CO oxidation. The incorporation of Au and Pd nanoparticles into the cobalt oxide support leads to significantly improved catalytic activity and stability of the binary catalyst systems. Finally, we report the synthesis of nanowires of Ge, Mg, Pd, and Pt using the vapor-liquid-solid (VLS) method where the vapor-phase growth of the wire is catalyzed using a proper metal catalyst present in the liquid phase.

Novel two-step vapor-phase synthesis of UV–Vis light active Fe2O3/WO3 nanocomposites for phenol degradation

2016 ◽  
Vol 23 (20) ◽  
pp. 20350-20359 ◽  
Author(s):  
Davide Barreca ◽  
Giorgio Carraro ◽  
Alberto Gasparotto ◽  
Chiara Maccato ◽  
Cinzia Sada ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Phenol Degradation ◽  
Phase Synthesis ◽  
Vapor Phase Synthesis

Vapor-Phase Synthesis and Surface Passivation of ZnSe Nanocrystals

2006 ◽  
Vol 8 (3-4) ◽  
pp. 533-542 ◽  
Author(s):  
Christos Sarigiannidis ◽  
Maria Koutsona ◽  
Athos Petrou ◽  
T.J. Mountziaris
Keyword(s):  
Vapor Phase ◽  
Surface Passivation ◽  
Phase Synthesis ◽  
Vapor Phase Synthesis ◽  
Znse Nanocrystals

Elemental vapor-phase synthesis of nanostructured zinc oxide

2009 ◽  
Vol 45 (11) ◽  
pp. 1246-1251 ◽  
Author(s):  
A. N. Red’kin ◽  
Z. I. Makovei ◽  
A. N. Gruzintsev ◽  
E. E. Yakimov ◽  
O. V. Kononenko ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Vapor Phase ◽  
Phase Synthesis ◽  
Nanostructured Zinc Oxide ◽  
Vapor Phase Synthesis

scholarly journals Vapor phase synthesis of glycerol carbonate over honeycomb monolith coated with zirconia based base catalysts

2018 ◽  
Vol 53 (1) ◽  
pp. 21-28
Author(s):  
VT Vasantha ◽  
SZ Mohamed Shamshuddin ◽  
M Shyamsundar ◽  
Reena Saritha Serrao ◽  
Joyce Queeny D’Souza
Keyword(s):  
Catalytic Activity ◽  
Vapor Phase ◽  
Glycerol Carbonate ◽  
Phase Synthesis ◽  
Base Catalysts ◽  
Catalytic Materials ◽  
Bed Temperature ◽  
Surface Basicity ◽  
Catalytic Material ◽  
Vapor Phase Synthesis

In this article the synthesis, characterization and catalytic activity studies of zirconia based base catalysts such as Mg(II)/ZrO2, Ca(II)/ZrO2 and Ba(II)/ZrO2 coated on honeycomb monoliths is reported. Honeycomb monoliths were coated with Mg(II)/ZrO2, Ca(II)/ZrO2, Ba(II)/ZrO2 and characterized for their physico-chemical properties such as surface basicity, crystallinity and morphology by using relevant techniques. The catalytic activity of these catalytic materials was evaluated in vapor phase synthesis of glycerol carbonate. The reaction conditions were optimized by varying reaction parameters such as nature of catalytic material, molar ratio of the reactants, catalyst bed temperature, feed-rate of the reactants and time-on-stream to obtain highest possible yield of glycerol carbonate with greater selectivity. The catalytic materials were found to be highly efficient in the synthesis of glycerol carbonate with a possible highest yield up to ~98%. These catalytic materials can be easily reactivated and reused in this reaction.Bangladesh J. Sci. Ind. Res.53(1), 21-28, 2018

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