Electret properties of silicon dioxide aerogels

Author

Cao, Yang ; Xia, Zhongfu ; Li, Qing ; Chen, Linyan ; Zhou, Bing

Author_Institution

Pohl Inst. of Solid State Phys., Tongji Univ., Shanghai, China

fYear

1996

fDate

25-30 Sep 1996

Firstpage

40

Lastpage

45

Abstract

In this paper, the electret properties of a kind of new inorganic materials, the silicon dioxide aerogels, are studied. By using single- and two- step sol-gel processing and supercritical drying method, bulk and film silicon dioxide aerogels of low density which is about several hundred mg/cm³ are prepared. Samples are heat treated at 800°C for several hours to eliminate organic residuals and water and then chemical surface modified by hexamethyldisilazane treatment. Electret properties of these samples corona charged at temperatures ranging from RT to 200°C are studied with measurements of isothermal surface potential decay as well as thermally stimulated discharge. The relationship between the microstructure of these samples and their electret properties is discussed. Our results show that silicon dioxide aerogels with rather good electret properties are obtained

Keywords

electrets; porous materials; silicon compounds; sol-gel processing; surface potential; thermally stimulated currents; SiO₂; bulk; chemical surface treatment; corona charging; density; electret; film; heat treatment; hexamethyldisilazane; inorganic material; isothermal surface potential decay; microstructure; silicon dioxide aerogel; sol-gel processing; supercritical drying; thermally stimulated discharge; Corona; Electrets; Heat treatment; Inorganic materials; Organic chemicals; Semiconductor films; Silicon compounds; Surface discharges; Surface treatment; Water heating;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1996. (ISE 9), 9th International Symposium on

Conference_Location

Shanghai

Print_ISBN

0-7803-2695-4

Type

conf

DOI

10.1109/ISE.1996.578037

Filename

578037