论文部分内容阅读
湿敏材料的开发与研究是传感器研究的重要领域.从材料的角度而言,湿敏材料主要包括电解质型、高分子型和陶瓷型3大类.氯化锂湿敏材料是典型的电解质型,早在70年代初期就已经实用化.其制作方法是将氯化锂溶液与聚乙烯醇溶液按一定比例混合,再利用混合溶液制备出湿敏薄膜.调节氯化锂与聚乙烯醇的比例,制出不同性质的膜,它们分别在不同的湿度范围内敏感.所以,要获得全湿范围内的敏感元件,必须将上述不同性质的膜以单元的形式组合.因此,使得传感器的成本很高,只限于在军事方面使用,民用化比较困难.众所周知,多孔二氧化硅具有很好的物理、化学稳定性,而且还可通过改变制备条件控制其显微结构.采用溶胶-凝胶技术可获得所需结构特性的多孔二氧化硅材料.本文偿试将氯化锂与多孔二氧化硅复合,获得了在全湿范围内具有敏感特性的湿敏薄膜材料.元件的响应、恢复特性很好,采用提拉法制备薄膜,方法简单,效果良好.
Moisture-sensitive materials development and research is an important area of sensor research.From the material point of view, the moisture-sensitive materials mainly include electrolyte type, polymer type and ceramic type 3. Lithium chloride moisture-sensitive material is a typical electrolyte type , As early as the early 1970s has been practical.Its production method is to lithium chloride solution and polyvinyl alcohol solution by a certain percentage of mixing and then use the mixed solution to prepare a moisture sensitive film.Adjust the ratio of lithium chloride and polyvinyl alcohol , To produce different nature of the film, they were sensitive to different humidity range.So, in order to obtain the whole wet range of sensitive components, the above-mentioned different nature of the film must be combined in the form of unit.Therefore, making the sensor cost is very High, limited to military use, civilized more difficult.It is well known that porous silica has good physical and chemical stability, but also by changing the preparation conditions to control the microstructure of the use of sol-gel technology can To obtain the desired structural properties of porous silica materials.This paper attempts to lithium chloride and porous silica composite obtained in the wet range of sensitive properties of the moisture sensitive film Response element, a very good recovery characteristics, were prepared by pulling the film, a simple method with good results.