锡酸盐
材料科学
光催化
退火(玻璃)
纳米复合材料
光致发光
尖晶石
锌
荧光粉
发光
化学工程
异质结
色度
光电子学
纳米技术
冶金
光学
化学
催化作用
生物化学
物理
工程类
作者
Mu‐Tsun Tsai,Yee‐Shin Chang,You‐Cheng Liu
标识
DOI:10.1016/j.ceramint.2017.05.251
摘要
In the present study, ZnO/SnO2 nanocomposites and Zn2SnO4 powder phosphors were synthesized via a sol–gel method through the control of annealing process. The coupled oxides ZnO/SnO2 nanopowders formed after annealing at 400–600 °C, and the spinel zinc stannate phase appeared at 700 °C. On annealing in the temperature range of 1000–1200 °C, Zn2SnO4 is the dominant phase with small traces of ZnO and SnO2. The photocatalysis evaluation indicated that the photocatalytic activity of ZnO/SnO2 nanocomposites for the degradation of azo dye Acid Orange 7 (AO7) was much higher than those of pure ZnO and SnO2 under near UV light irradiation. The higher photocatalytic activity is related to the formation of nano-heterostructures, which provided an effective way to suppress the charge recombination and enhanced the degradation efficiency consequently. Under excitation at 327 nm, photoluminescence (PL) spectra revealed the Zn2SnO4 powder phosphors having a weak n-UV emission and a broad visible emission around 400–700 nm with peaking at 548 nm. Chromaticity diagram exhibited the Zn2SnO4 powders having the characteristics of near white light emission. The results show that ZnO/SnO2 nanocomposites and Zn2SnO4 powders have potential applications for the nanophotocatalysts, display, and solid-state lighting devices, respectively.
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