氨基功能化有序介孔SiO_2薄膜组装Au纳米粒子复合材料的可调色散性质  

Adjustable Dispersive Property of the Nanocomposite of Gold Nanoparticles in Amino-functionalized Mesoporous Silica Thin Films

作　　者：方靖岳[1] 秦石乔[1] 张学骜[1] 李新华[1] 王飞[1] 常胜利[1] 

机构地区：[1]国防科学技术大学理学院,长沙410073

出　　处：《高等学校化学学报》2011年第7期1460-1465,共6页Chemical Journal of Chinese Universities

基　　金：中国科学技术大学校预研基金(批准号:JC08-02-08)资助

摘　　要：以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷(P123)为模板剂,采用共溶胶的蒸发诱导自组装方法制备了氨基功能化介孔SiO2薄膜,然后利用氯金酸(HAuCl4)与介孔SiO2薄膜孔道内壁的氨基之间的中和反应组装Au纳米粒子,制备得到Au/SiO2纳米复合材料.用TEM,XRD和UV-Vis光谱对材料进行了测试.结果表明,无水乙醇萃取获得的氨基功能化介孔SiO2薄膜具有高度有序的介孔结构;利用中和反应及氢气氛围煅烧还原的方法将Au纳米粒子组装在介孔SiO2薄膜的孔道中,Au纳米颗粒分散均匀且晶化良好,表现出(111)晶面的择优取向生长;随着中和反应时间的延长,Au纳米颗粒的粒径呈增长趋势,Au/SiO2纳米复合材料的吸收光谱发生红移,表明存在Au量子点的量子尺寸效应,即说明通过改变浸渍时间可以调控Au/SiO2纳米复合材料的色散性质.Highly ordered amino-functionalized mesoporous silica thin films（MTFs） were directly synthesized by co-condensation of tetraethoxysilane（TEOS） and 3-aminopropyltriethoxysilane（APTES） in the presence of P123（EO20PO70EO20）.According to the neutralization-reaction mechanism followed by a reduction procedure of hydrogen-ambience calcinations,gold nanoparticles were introduced into the pore channels of amino-functionalized MTFs,and the Au/SiO2 nanocomposite was obtained.The nanomaterials were characterized by XRD,TEM,and UV-Vis.It was found that removing the surfactant by ethanol extraction,but not by calcination,could get well-ordered mesoporous structures;gold nanoparticles grew in a preferred orientation of（111） plane of the face-centered-cubic structure in the pore channels and crystallized nicely;the absorption spectrum of Au/SiO2 nanocomposite underwent a red-shift as the reaction time increase,which proves a quantum size effect of gold nanoparticles exists,and dipping time could regulate the dispersive property of Au/SiO2 nanocomposite.

关 键 词：有序介孔SiO2薄膜 氨基功能化 AU纳米粒子 吸收光谱 色散性质 

分 类 号：O614.123[理学—无机化学] O613.72[理学—化学]