摘要
采用在高温管式炉中通入氨氩混合气对SiO_2／TiO_2复合粉体进行掺氮的方法制得新型纳米级复合粒子SiO_2／TiO_(2-x)N_x,其中SiO_2,TiO_2复合粉体是通过钛酸四正丁酯水解法在预先分散于纯水中的纳米SiO_2粒子表面包覆TiO_2所制得。采用多种手段对样品的结构、形貌及光吸收特性进行了表征。结果表明,在450℃下掺氮反应3h后,样品中氮元素摩尔百分含量为1.43％,即复合粒子分子式为SiO_2／TiO_(1.901)N_(0.099),粒径小于20nm,粒子为包覆型结构,外层为锐钛矿相TiO_2,内层为无定型SiO_2,其光吸收阀值由387nm红移至500nm左右。
A novel composite material--SiO2/TiO2- x Nx particle was synthesized by nitrogen doped SiO2/TiO2 powders in pipe-still heater, the SiO2/TiO2 powders prepared by hydrolyzing tetra-n-butyl titanate in dispersed solution of silicon dioxide previously. XRF, TG-DTA, XRD, XPS, TEM and UV-VIS facilities were employed to characterize the composite＇ s morphosis and properties of optical absorption. The results showd that the sample （nitrogen doping for three hours at 450℃ ） appears light yellow, the chemical formula is SiO2/TiO1.901 N0.099, its shell is anatase titania and the core is amorphous silica, the average particle size is less than 20nm, the nitrogen content is about 1.43 % and the optical absorption edge shift from 387nm to 500nm significantly.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2006年第1期14-18,共5页
Acta Energiae Solaris Sinica
基金
上海市科委纳米专项(0215mm049)
关键词
纳米材料
复合
掺氮
氧化钛
氧化硅
nano-material
composite
nitridation
titania
silica
