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Band-gap engineering of Cd<sub>1-x</sub>Zn<sub>x</sub>Te films deposited by pulsed laser deposition
Yoo, S.,Avendano, J.,Delmar, L.,Nam, S.,Quevedo-Lopez, M.,Choi, H. Elsevier Sequoia 2016 THIN SOLID FILMS - Vol.612 No.-
We demonstrate enhanced band-gap tunability in Cd<SUB>1-x</SUB>Zn<SUB>x</SUB>Te thin films (x=0, 0.03, 0.06, 0.1, 0.2, or 1) fabricated directly from Cd<SUB>1-x</SUB>Zn<SUB>x</SUB>Te targets using pulsed laser deposition (PLD). All the Cd<SUB>1-x</SUB>Zn<SUB>x</SUB>Te films have uniform thicknesses of ~200nm, crystalline sizes of ~20nm, and are highly oriented in the [111] direction. The annealed Cd<SUB>1-x</SUB>Zn<SUB>x</SUB>Te targets allow better compositional control of the Cd<SUB>1-x</SUB>Zn<SUB>x</SUB>Te films than non-annealed targets. This new process using a single target with high compositional uniformity provides better tunability of the Cd<SUB>1-x</SUB>Zn<SUB>x</SUB>Te film lattice parameter (6.49 to 6.09A) and band gap (1.48 to 2.22eV) by increasing the Zn concentration (x) from 0 to 1.
Marissa A. Paglicawan,김병선,Blessie A. Basilia,Carlo S. Emolaga,Delmar D. Marasigan,Paul Eric C. Maglalang 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.1 No.3
To improve the adhesion and wetting between the abaca fibers and matrix, the surface of abaca fabric was modified using plasma polymerization. Different plasma exposure times were conducted to determine the effect of plasma treatment on the properties of the composites. A combination of plasma and other surface modification processes was also investigated to determine whether double treatments could further enhance the properties of these composites. Combined treatments involve plasma polymerization of the fabric after pretreatment with one of the following surface-modification reagents: a) γ -methacrylopropyltrimethylsilane, b) triethoxyvinylsilane, and c) 2%w/w NaOH (aq).The abaca fabric/unsaturated polyester composites were fabricated using the vacuum-assisted resin transfer molding (VARTM) technique.SEM results showed that 10 to 20 seconds plasma treatment gave the right amount of surface roughness for maximum fiber and matrix adhesion leading to improved mechanical properties of the composites. Longer plasma treatment time and double treatment however resulted in composites with lower mechanical properties. Although the composite with alkali and plasma-treated fabric showed the lowest mechanical properties it exhibited the lowest water uptake in both distilled water and brine solution.