Papers by Keyword: Low-Temperature Preparation

Abstract: This paper describes the photoactive and antibacterial properties of TiO2, Fe3+/TiO2 and N/TiO2 thin films on 304 stainless steel substrate that prepared by a sol-gel and dip coating methods. Anatase phase crystalline together with an amorphous phase was formed after refluxed at 100W for 2h using a domestic microwave oven followed by oven heating in low temperature range 100-250°C for 1 h. The adhesion between thin film and stainless steel substrate is strong and films thickness observed by SEM were about 700~1000 nm. FT-IR spectra of as-prepared TiO2 powders reveal hydroxyl radical on TiO2 surfaces, leading to promotion of photocatalytic reaction of the films. Photocatalytic activity was determined by means of degradation of methylene blue solution under UV irradiation and antibacterial efficiency was evaluated by inactivation of E.coli. The photocatalytic reaction rate can be expressed as an exponential equation. TiO2 and TiO2 composite thin films exhibited high photoactive and antibacterial properties under UV irradiation comparing to control. E.coli was killed about 80% and 95% during treatment with UV for 1 and 3 h, respectively.

Abstract: 2D-C/SiC composites with high performance were prepared at temperatures as low as 900 °C. The flexural strength of the composites reached 329.61MPa, the same level as the composites prepared at 1200°C, and shear strength and fracture toughness were 32.14MPa and 14.65MPa·m1/2, respectively. The microstructure and mechanical properties of the composites after heat-treatment at 1600°C were also investigated to determine the potential applications at high temperature.

Abstract: Pb(Zr, Ti)O3 thin films were successfully prepared on (111)Pt/IrO2/SiO2/(100)Si substrates using SrTiO3 seeds at 290 oC by RF inductive heating type and 350 oC by resistive heating type metalorganic chemical vapor deposition method (MOCVD), respectively. The SrTiO3 was chosen as seed layers and prepared by pulsed laser deposition method. The crystal structures and orientations of SrTiO3 seeds were changed by deposition temperature. In the case of preparation with RF inductive heating MOCVD, the remanent polarization (2Pr) and coercive field (2Ec) were 42 μC/cm2 and 256 kV/cm, respectively.