On the nature of the processes occurring in silver doped SiO2 films under heat treatment

被引：7
|
作者：
Shevchenko, Gvidona P. [2 ]
Vashchanka, Svyatlana V. [1 ]
Bokshits, Yulia V. [2 ]
Rakhmanov, Sergey K. [3 ]
机构：
[1] Inst Mol & Atom Phys NAS Belarus, Minsk 220072, BELARUS
[2] Belarusian State Univ, Res Inst Physicochem Problems, Minsk 220080, BELARUS
[3] Belarusian State Univ, Minsk 220050, BELARUS
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2008年 / 45卷 / 02期
关键词：
nanocomposites; silica; sol-gel films; silver nanoparticles; silver silicate;
D O I：
10.1007/s10971-007-1654-3
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The processes taking place on air-heating of SiO2-Ag+ films and xerogels produced from the SiO2 sols of different pH (3.7 or 9.5) were investigated. Silver nanoparticles 10-40 nm in size tolerant to oxidation at temperatures above 600 degrees C were found to be formed in the systems whatever the pH value of the starting sol. SiO2 crystallization giving the cristobalite phase in the temperature range from 500 to 800 degrees C was shown to proceed only in the films produced from the acidic sol, while in those formed from the alkali one SiO2 remained amorphous. A mechanism by which the formation of Ag nanoparticles and the cristobalite phase occurs in the films at the oxidative conditions is suggested.
引用
收藏
页码：143 / 149
页数：7
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