聚乙烯吡咯烷酮改进TiO_2薄膜的可见光增强氧敏特性
Improvement of Oxygen-Sensing Properties of Sol-Gel TiO_2 Film under Visible Light by Polyvinyl Pyrrolidone
查看参考文献15篇
文摘
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室温下工作的半导体气敏材料是一个有吸引力的研究方向。本文以钛酸四丁酯和乙醇胺为主要原料,用溶胶一凝胶法在氧化铝陶瓷片上制备了一种TiO_2气敏膜。在可见光照射下,这种气敏膜在室温附近就有明显的可见光增强氧敏性;通过不同溶胶体系的对比,溶胶中添加聚乙烯吡咯烷酮(PVP),烧结后的TiO_2膜光增强氧敏性最好,但在添加PVP的同时再添加柠檬酸,则光增强氧敏性下降;扫描电镜下观察,添加PVP的溶胶烧结后获得一种多孔结构的TiO_2膜;而不加PVP,或添加PVP的同时再添加柠檬酸的溶胶烧结后获得的是一种连续,致密和有微裂纹的的TiO_2膜。对上述PVP促进多孔结构形成的机理进行了分析,最后对半导体可见光增强气敏性的原理和气敏材料改进的方法进行了简要的讨论。 |
其他语种文摘
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Reducing the sensing temperature of semiconductor oxides to room temperature has been actively pursued recently. In present work, the TiO_2 gas sensing thin film was prepared on the alumina substrate by a sol-gel method, in which the major raw materials were the tetrabutylorthotitanate (Ti(OBu)_4) and ethanolamine (EA), while the main additive was polyvinyl pyrrolidone (PVP). The TiO_2 thin film showed a strong oxygen-response under visible light at room temperature, when only PVP was the additive in the sol-gel solution. The oxygen-response of the TiO_2 thin film was weak if both PVP and citric acid (CA) were added into sol-gel or without PVP. It was found that the TiO_2 thin film was porous when only PVP was added into the sol-gel and the thin film was continuous and compact when both PVP and CA were added or without PVP. The effects of the porous structure and light were discussed, and the future directions were suggested for further improving the gas sensing properties of TiO_2 thin films. |
来源
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传感技术学报
,2008,21(9):1481-1486 【核心库】
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关键词
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TiO_2
;
半导体气敏材料
;
光催化
;
氧探头
;
溶胶-凝胶法
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地址
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中国科学院金属研究所, 沈阳材料科学国家(联合)实验室, 辽宁, 沈阳, 110016
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1004-1699 |
学科
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自动化技术、计算机技术 |
基金
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国家973计划
;
国家973计划
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文献收藏号
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CSCD:3415902
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