Optical Characterization of Surface Profiles of Various Si1-xGex/Si Wafers Before and After Annealing Step

2019 ◽  
Vol 28 (1) ◽  
pp. 261-268
Author(s):  
Woo Sik Yoo ◽  
Takeshi Ueda ◽  
Toshikazu Ishigaki ◽  
Kitaek Kang
Keyword(s):  
Optical Characterization ◽  
Annealing Step ◽  
Before And After ◽  
Surface Profiles

Optical characterization of polycrystalline silicon before and after thermal oxidation

1985 ◽  
Vol 125 (3-4) ◽  
pp. 235-241 ◽  
Author(s):  
P. Montaudon ◽  
M.H. Debroux ◽  
F. Ferrieu ◽  
A. Vareille
Keyword(s):  
Thermal Oxidation ◽  
Polycrystalline Silicon ◽  
Optical Characterization ◽  
Before And After

An Electron Microscope Study of Interdiffusion and Compound Formation in Ta-Au Thin Films

1973 ◽  
Vol 31 ◽  
pp. 32-33 ◽  
Author(s):  
T. C. Tisone ◽  
S. Lau
Keyword(s):  
Electron Microscope ◽  
Electron Microscope Study ◽  
Thermally Grown Oxide ◽  
Ion Milling ◽  
Compound Formation ◽  
Technology Application ◽  
Transmission Electron ◽  
Before And After ◽  
Au Thin Films

In a study of the properties of a Ta-Au metallization system for thin film technology application, the interdiffusion between Ta(bcc)-Au, βTa-Au and Ta2M-Au films was studied. Considered here is a discussion of the use of the transmission electron microscope(TEM) in the identification of phases formed and characterization of the film microstructures before and after annealing.The films were deposited by sputtering onto silicon wafers with 5000 Å of thermally grown oxide. The film thicknesses were 2000 Å of Ta and 2000 Å of Au. Samples for TEM observation were prepared by ultrasonically cutting 3mm disks from the wafers. The disks were first chemically etched from the silicon side using a HNO3 :HF(19:5) solution followed by ion milling to perforation of the Au side.

Crystal Growth and Electro-optical Characterization of In2Se2.7Sb0.3 Compound

2020 ◽  
Vol 12 (4) ◽  
pp. 04022-1-04022-4
Author(s):  
Piyush Patel ◽  
◽  
S. M. Vyas ◽  
Vimal Patel ◽  
Himanshu Pavagadhi ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Optical Characterization

Optical Characterization of Monodispersed Aaqueous Cu2+-Doped CdS Nanoparticles Prepared Under Microwave Irradiation Conditions

2014 ◽  
Vol 01 (999) ◽  
pp. 1-1
Author(s):  
Wei Zhu ◽  
Qihui Shen ◽  
Xinjian Bao ◽  
Xiao Bai ◽  
Tingting Li ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Optical Characterization ◽  
Cds Nanoparticles

Application of Kubelka-Munk model on the optical characterization of translucent dental zirconia

2021 ◽  
Vol 258 ◽  
pp. 123994
Author(s):  
Luciana M. Schabbach ◽  
Bruno C. dos Santos ◽  
Letícia S. De Bortoli ◽  
Márcio Celso Fredel ◽  
Bruno Henriques
Keyword(s):  
Optical Characterization

scholarly journals Adsorption Studies on Magnetic Nanoparticles Functionalized with Silver to Remove Nitrates from Waters

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1757
Author(s):  
Yesica Vicente-Martínez ◽  
Manuel Caravaca ◽  
Antonio Soto-Meca ◽  
Miguel Ángel Martín-Pereira ◽  
María del Carmen García-Onsurbe
Keyword(s):  
Magnetic Nanoparticles ◽  
Nitrate Content ◽  
Adsorption Efficiency ◽  
Experimental Conditions ◽  
Dependent Behavior ◽  
Before And After ◽  
Naoh Solution ◽  
High Concentrations ◽  
Interference Studies

This paper presents a novel procedure for the treatment of contaminated water with high concentrations of nitrates, which are considered as one of the main causes of the eutrophication phenomena. For this purpose, magnetic nanoparticles functionalized with silver (Fe3O4@AgNPs) were synthesized and used as an adsorbent of nitrates. Experimental conditions, including the pH, adsorbent and adsorbate dose, temperature and contact time, were analyzed to obtain the highest adsorption efficiency for different concentration of nitrates in water. A maximum removal efficiency of 100% was reached for 2, 5, 10 and 50 mg/L of nitrate at pH = 5, room temperature, and 50, 100, 250 and 500 µL of Fe3O4@AgNPs, respectively. The characterization of the adsorbent, before and after adsorption, was performed by energy dispersive X-ray spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller analysis and Fourier-transform infrared spectroscopy. Nitrates can be desorbed, and the adsorbent can be reused using 500 µL of NaOH solution 0.01 M, remaining unchanged for the first three cycles, and exhibiting 90% adsorption efficiency after three regenerations. A deep study on equilibrium isotherms reveals a pH-dependent behavior, characterized by Langmuir and Freundlich models at pH = 5 and pH = 1, respectively. Thermodynamic studies were consistent with physicochemical adsorption for all experiments but showed a change from endothermic to exothermic behavior as the temperature increases. Interference studies of other ions commonly present in water were carried out, enabling this procedure as very selective for nitrate ions. In addition, the method was applied to real samples of seawater, showing its ability to eliminate the total nitrate content in eutrophized waters.

Sign in / Sign up

Export Citation Format

Share Document