表面异质结构对二氧化钛纳米带光电与气敏性能的调控机理及应用探索

项目名称： 表面异质结构对二氧化钛纳米带光电与气敏性能的调控机理及应用探索

项目编号： No.50872070

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 轻工业、手工业

项目作者： 刘宏

作者单位： 山东大学

项目金额： 35万元

中文摘要： 二氧化钛纳米带具有一维半导体纳米材料所具有的特殊的结构特征和独特的物理、化学性质，但是其光催化、气敏和光电领域的应用仍然存在一定的局限。本研究以二氧化钛纳米带作为基质材料，在二氧化钛纳米带表面制备半导体氧化物、金属纳米颗粒或导电聚合物，对纳米带的性能进行调控，制备了高催化性能、高气敏特性和具有良好光电性能的二氧化钛纳米器件。利用分子模拟预测异质结构的性能，并进行结构设计和材料制备。采用具有自主知识产权的光催化还原技术制备了贵金属纳米颗粒/二氧化钛纳米带表面异质结构；采用化学液相沉积分解法制备了具有p-n表面异质结构的二氧化钛纳米带；采用边聚合-边复合的方法制备了导电聚合物/二氧化钛纳米带表面异质结构。成功的利用p-n结、肖特基势垒和表面等离基元共振效应有效的减少了光生载流子的复合，显著提高了二氧化钛纳米带的性能。本研究还将具有表面异质结构的二氧化钛纳米带制备成"纳米纸"，利用具有自主知识产权的连续光催化装置，对甲基橙实现了连续光催化降解。同时将"纳米纸张"制成的纳米器件成功的应用在光电、气敏和生物传感器等领域，并表现出优良的性能。

中文关键词： 纳米带表面异质结构；二氧化钛；光电性能；气敏特性；调控

英文摘要： Titanium dioxide nanobelts have special structural features and unique physical and chemical properties of one-dimensional semiconductor nanomaterials, but there are still some limitations in photocatalytic, gas sensing and photovoltaic field of application. In this study, titanium dioxide nanobelts are matrix materials, and we prepare semiconductor oxide, metal nanoparticles or conductive polymers in their surface, and regulate the performance of the nanobelts to prepare high catalytic performance, high gas sensing properties and good photoelectric the performance of titanium dioxide nano-devices. We use molecular modeling to predict the performance of the heterogeneous structure, structural design and materials preparation. We use the photocatalytic reduction technology with independent intellectual property rights to prepare noble metal nanoparticles/titania nanobelt surface heterostructure; We use the chemical liquid deposition decomposition to prepare the surface heterogeneous structure of the p-n titanium dioxide nanobelts; By means of edge aggregation-edge composite, we prepare the conductive polymer/titania nanobelt surface heterostructure. We successfully use the p-n junction, schottky barrier and surface resonance effect to effectively reduce photogenerated carrier compound, and significantly improve the performance of titanium dioxide nanobelts. This study also uses surface heterogeneous structure of titanium dioxide nanobelts to prepare nano-paper, and use the continuous photocatalytic devices with independent intellectual property rights to achieve the continuous photocatalytic degradation of methyl orange. The nano-devices, made by the nano-paper, are successful applied in the field of optoelectronics, gas and biological sensors, and show excellent performance.

英文关键词： Nanobelt surface heterostructure; Titanium dioxide; Photoelectric performance; Gas sensor properties; Regulation