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一、前言 纳米固体是由纳米量级的小颗粒压制而成,颗粒之间的分界面占很大的比例。由于小尺寸效应和界面效应使纳米固体比同样成分的传统宏观固体性能优越,纳米SnO_2固体的气敏特性具有灵敏度高、响应速度快的特点,并随颗粒尺寸减小这种特性愈来愈明显。为了探索纳米SnO_2固体的气敏特性与界面的相关性,研究纳米固体的界面结构和弛豫行为显得十分重要。
First, the introduction of nano-solid by the nano-scale small particles from the suppression, the interface between particles accounted for a large proportion. Due to its small size effect and interface effect, the nano-solid is better than the traditional macro-solid with the same composition. The gas-sensing properties of the nano-sized SnO_2 solid have the characteristics of high sensitivity and fast response, and become more and more obvious as the particle size decreases . In order to explore the correlation between the gas sensing properties of nano-SnO_2 solid and the interface, it is very important to study the interface structure and relaxation behavior of nano-solid.