摘要
首次报道采用溶液电火花制备Ag—TiO2纳米级复相超细粉，XRD和TEM分析表明，所得产物可是金红石相也可是锐钛矿相，粒径分布均匀，一般在5～20nm内，超细粉经超声重新分散后所得纳米粒子的TEM像指出，许多粒子是由金属Ag粒子和TiO2粒子互相粘连构成葫芦状混合复相纳米结构，显示有比涂层修饰粒子略有减弱的增强激光拉曼散射（SERS）效应和相应的光学性质。讨论了含有Ag涂层的复合TiO2粒子与纯TiO2粒子互相粘连构成混合复相纳米粒子的可能性。
It is reported firstly that Ag-TiO2 hybrid ultrafines is prepared by liquid arcdischarge combined with hydrothermal treatment. According to XRD and TEM analysis thephase of product obtained may be rutile phase or anatase phase with narrow she distribution inthe range of 5~ 30nm. TEM image of hybrid particles obtained from the complex-phaseultrafines by ultrasonic dispersion shows that some Ag and TiO2 particles closely link together toform a calabash - like nanostructure. A surface - enhanccd Raman scattering (SERS) of Ag-TiO2composite decorated by Ag particles is also observed, although the magnitude of enhancement isnot as large as that of the colloidal particles system coated by metal on the surface. We alsobriefly discuss the possibility of forming nanometer-scale structure model of (TiO2 nuclei withcoating Ag)-pure TiO2 complex phase particles.
基金
国家自然科学基金
关键词
银
二氧化钛
纳米级
复相超细粉
复合材料
Liquid arc discharge Decoration of nanoparticles Ag-TiO_2 complex-phase ultrafines SERS
