电纺SnO2纳米纤维及其异质结构有序阵列材料的制备与气敏性能研究

项目名称： 电纺SnO2纳米纤维及其异质结构有序阵列材料的制备与气敏性能研究

项目编号： No.61201107

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 李兴华

作者单位： 东北师范大学

项目金额： 25万元

中文摘要： 灵敏度、选择性和稳定性是SnO2气敏材料研究中的核心问题。晶粒尺寸和晶界势垒不均匀所导致的渗漏电流是进一步提高灵敏度的重要障碍。本项目拟从材料的结构设计入手，采用静电纺丝技术结合物理/化学方法制备SnO2纳米纤维及其异质结构SnO2/MOx(MOx=ZnO,In2O3,TiO2,等)有序阵列材料；利用晶粒可控性和一维有序性，既实现晶界势垒区载流子浓度的有效调控，又有效减小渗漏电流，提高其灵敏度；通过异质结修饰，调控和改善气体的选择性，降低工作温度，提高稳定性。研究材料制备的各种因素以及材料的微结构对其气敏性能的影响规律，获得具有高灵敏度、较好的气体选择性以及长期工作稳定性能的SnO2纳米纤维及其异质结构有序阵列材料，探索其在构筑新型气敏器件领域的应用。本项目有望深入探讨敏感机制和特殊的纳米结构之间的关系，为获得高性能气敏器件提供新的设计思路和奠定实验基础。

中文关键词： 二氧化锡；纳米纤维；异质结；电荷转移；静电纺丝

英文摘要： The sensitivity, selectivity, and stability are the key issues in the study of SnO2 gas sensing materials. The leak currents due to the crystal size variation and the nonuniform of the barriers degrade the sensitivity of the materials. Thus, through a structure modification, the project intends to construct well aligned electrospun SnO2 nanofibers and its heterostructures SnO2/MOx (MOx=ZnO, In2O3, TiO2, etc.) arrays by combining the electrospinning technology and physical/chemical methods. The carrier concentrations in the crystal barriers can be controlled effectively by the crystal size and the leak currents can be avoided due to one dimensional confinement of the work currents which come from the well aligned one dimensional nanostructure arrays. The above two factors benefit the improvement of the gas sensitivity. The heterostructures formed by the modification of some other metal oxide materials might improve the gas sensing selectivity, decrease the working temperature, and improve the long term working stability. In our project, the gas sensing properties will be carefully studied and controlled by tuning the preparation process and the microstructure of the sensing materials. Well aligned electrospun SnO2 nanofibers and its heterostructures (SnO2/MOx) arrays with high sensitivity, good selectivity, and

英文关键词： SnO2；nanofiber；heterojunction；charge transfer；electrospinning