摘要
以正硅酸乙酯(TEOS)为前驱体,硝酸银为掺杂剂,采用酸碱两步催化sol-gel方法,获得掺杂纳米Ag微晶的SiO2气凝胶,其中银的掺入量在1%-30%wt范围内可控。用红外光谱(IR)、透射电子显微镜(TEM)、X射线荧光(XRF)、X射线衍射(XRD)和比表面积仪(BET)技术分析了气凝胶的结构组成和掺杂物质的存在形式。测量显示,Ag-SiO2气凝胶平均孔径在15nm左右,比表面积在500m2/g以上;掺杂物以单质银微晶形式存在,微晶大小在50nm左右。
Ag-doped silica aerogels were prepared with silver nitrate, TEOS as raw material via sol-gel method, and the doping concentration of Ag can be controlled in the range of 1%-30% wt. The samples were charactered by means of IR, TEM, XRF, XRD and BET. The structures and chemical properties of aerogels were analyzed. The results indicate that the average pore sizes of aerogels were about 15nm, BET surface areas more than 500m^2/g, the sizes of doped Ag nano-meter particles were about 50nm.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2008年第5期735-738,共4页
Journal of Materials Science and Engineering
基金
国家高技术863计划项目(2007AA804137)
教育部国防基础科研培育项目计划项目(A1420060199)
上海科技启明星计划项目(05QMX1454)
上海市科委纳米技术专项项目(0652nm044)
上海市科委科技攻关计划项目(052211010)
关键词
SIO2气凝胶
掺杂
高比表面积
纳米银
SiO2 aerogel
Ag-doped
high specific surface area
Ag nano-meter particles
