Directed synthesis, growth process and optical properties of monodispersed CaWO4 microspheres via a sonochemical route

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 19893-19899 ◽  
Author(s):  
Jira Janbua ◽  
Jitkasem Mayamae ◽  
Supamas Wirunchit ◽  
Rattanai Baitahe ◽  
Naratip Vittayakorn
Keyword(s):  
Optical Properties ◽  
Growth Process ◽  
Calcium Tungstate ◽  
Directed Synthesis

Monodispersed calcium tungstate (CaWO4) microspheres were synthesized successfully via a sonochemical process.

Physical Properties of Thin Films of GaAs and AlxGa1-xAs Grown by Solid-Arsenic-Based MOCVD

2014 ◽  
Vol 976 ◽  
pp. 25-29
Author(s):  
Roberto Castillo-Ojeda ◽  
Joel Diaz-Reyes ◽  
Miguel Galván-Arellano ◽  
Ramon Peña-Sierra
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Low Temperature ◽  
Growth Process ◽  
Carbon Incorporation ◽  
Infrared Measurements ◽  
Hall Effect Measurements ◽  
Low Temperature Photoluminescence

We have studied the optical properties of GaAs and AlxGa1-xAs thin films using low-temperature photoluminescence and Fourier transform infrared spectroscopy. The GaAs and its alloys were grown by MOCVD using solid arsenic instead of arsine, as the arsenic precursor. The gallium and aluminium precursors were trimethylgallium (TMGa) and trimethylaluminium (TMAl), respectively. Some difficulties for growing AlxGa1-xAs by solid-arsenic-based MOCVD system are the composition homogeneity of the layers and the oxygen and carbon incorporation during the growth process. The composition homogeneity of the films was evaluated by low-temperature photoluminescence. Infrared measurements on the samples allowed the identification of the residual impurities, which are carbon-substitutional, Ga2O3, molecular oxygen, humidity and two unidentified impurities. Samples grown at temperatures lower than 750°C were highly resistive, independently of the ratio V/III used; the samples grown at higher temperatures were n-type, as it was proved by Hall effect measurements.

Substrate-directed synthesis of MoS2 nanocrystals with tunable dimensionality and optical properties

2019 ◽  
Vol 15 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Tomojit Chowdhury ◽  
Jungkil Kim ◽  
Erick C. Sadler ◽  
Chenyang Li ◽  
Seong Won Lee ◽  
...  
Keyword(s):  
Optical Properties ◽  
Directed Synthesis

scholarly journals Deposition of Al Thin Film on Steel Substrate: The Role of Thickness on Crystallization and Grain Growth

Metals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 12 ◽  
Author(s):  
Hayk Khachatryan ◽  
Sung-Nam Lee ◽  
Kyoung-Bo Kim ◽  
Moojin Kim
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Film Thickness ◽  
Grain Growth ◽  
Growth Process ◽  
Film Growth ◽  
Specular Reflection ◽  
Steel Substrate ◽  
Al Thin Film

In this study, we deposited aluminum (Al) films of different thicknesses on steel substrate and examined their phase, microstructure, and film growth process. We estimated that films of up to 30 nm thickness were mainly amorphous in nature. When the film thickness exceeded 30 nm, crystallization was observed. The further increase in film thickness triggered grain growth, and the formation of grains up to 40 nm occurred. In such cases, the Al film had a cross-grained structure with well-developed primary grains networks that were filled with small secondary grains. We demonstrated that the microstructure played a key role in optical properties. The films below 30 nm showed higher specular reflection, whereas thicker films showed higher diffuse reflections.

scholarly journals OPAA template-directed synthesis and optical properties of metal nanocrystals

2013 ◽  
Vol 8 (1) ◽  
Author(s):  
Xiu-chun Yang ◽  
Jun-wei Hou ◽  
Yan Liu ◽  
Miao-miao Cui ◽  
Wei Lu
Keyword(s):  
Optical Properties ◽  
Metal Nanocrystals ◽  
Directed Synthesis

Effect of Different Solvent Ratios (Water/Ethylene Glycol) on the Growth Process of CaMoO4Crystals and Their Optical Properties

2010 ◽  
Vol 10 (11) ◽  
pp. 4752-4768 ◽  
Author(s):  
V. S. Marques ◽  
L. S. Cavalcante ◽  
J. C. Sczancoski ◽  
A. F. P. Alcântara ◽  
M. O. Orlandi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ethylene Glycol ◽  
Growth Process

Optical properties of organic–inorganic hybrid films prepared by the two-step growth process

2009 ◽  
Vol 129 (9) ◽  
pp. 1036-1041 ◽  
Author(s):  
Nobuaki Kitazawa ◽  
Dhebbajaji Yaemponga ◽  
Masami Aono ◽  
Yoshihisa Watanabe
Keyword(s):  
Optical Properties ◽  
Growth Process ◽  
Hybrid Films ◽  
Inorganic Hybrid ◽  
Step Growth

scholarly journals Effect of different strontium precursors on the growth process and optical properties of SrWO4 microcrystals

2015 ◽  
Vol 50 (24) ◽  
pp. 8089-8103 ◽  
Author(s):  
J. C. Sczancoski ◽  
W. Avansi ◽  
M. G. S. Costa ◽  
M. Siu Li ◽  
V. R. Mastelaro ◽  
...  
Keyword(s):  
Optical Properties ◽  
Growth Process

Analysis of the Sublimation Growth Process of Silicon Carbide Bulk Crystals

1996 ◽  
Vol 423 ◽  
Author(s):  
R. Eckstein ◽  
D. Hofmann ◽  
Y. Makarov ◽  
St. G. Müller ◽  
G. Pensl ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Silicon Carbide ◽  
Optical Properties ◽  
Growth Process ◽  
Numerical Models ◽  
Chemical Processes ◽  
Bulk Crystals ◽  
Electrical And Optical Properties ◽  
Bulk Growth ◽  
Sublimation Growth

AbstractExperimental and numerical analysis have been performed on the sublimation growth process of SiC bulk crystals. Crystallographic, electrical and optical properties of the grown silicon carbide (SIC) crystals have been evaluated by various characterization techniques. Numerical models for the global simulation of SiC bulk growth including heat and mass transfer and chemical processes are applied and experimentally verified.

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