Photocatalytic soot oxidation on TiO2 microstructured substrate
Photocatalytic soot oxidation on TiO2 microstructured substrate
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DOI：
10.1016/j.cej.2017.06.094
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发表时间：
2017-11-01
影响因子：
15.1
通讯作者：
Kaviany, Massoud
中科院分区：
文献类型：
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作者：
Kameya, Yuki;Torii, Kenjiro;Kaviany, Massoud
研究了TiO 2微结构基片对煤烟的光催化氧化作用。使用软光刻工艺制备了烧结的TiO 2纳米颗粒的普通和微柱衬底。光子吸收分析显示，在当前基底厚度范围内（< 2.5 μ m），普通基底的光子传输量很大。通过电子显微镜和烧结引起的尺寸变化证实了基材的多孔结构，允许气体物种和自由基扩散穿过微米厚的基材。结果发现，烟灰氧化速率增加与厚度的平原二氧化钛基板，这是有关的增加与增加光子吸收相关的电子-空穴对生成。烟尘氧化率进一步增加与使用的二氧化钛微柱，通过多次散射增强光子吸收。这些多尺度现象在光催化氧化烟尘上的TiO 2微结构基板进行了分析。(C)2017爱思唯尔B. V.保留所有权利。
Photocatalytic soot oxidation was investigated using TiO2 microstructured substrates. Plain and micropillar substrates of sintered TiO2 nanoparticles were prepared using a soft lithography process. Photon absorption analysis revealed substantial photon transmission for plain substrate within the current substrate thickness range (< 2.5 mu m). The porous structure of substrate was confirmed by electron microscopy and by dimensional changes due to sintering, allowing gaseous species and radicals to diffuse across micrometer-thick substrates. It was found that the soot oxidation rate increased with the thickness of the plain TiO2 substrate; this was related to the increase in electron-hole pair generation associated with increased photon absorption. The soot oxidation rate increased further with the use of TiO2 micropillars, enhancing photon absorption through multiple scattering. These multiscale phenomena in the photocatalytic soot oxidation on TiO2 microstructured substrates were analyzed. (C) 2017 Elsevier B.V. All rights reserved.