Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, 106 Jiwei Road, Jinan 250022, People's Republic of China.
Phys Chem Chem Phys. 2011 Feb 21;13(7):2809-14. doi: 10.1039/c0cp01353f. Epub 2010 Dec 14.
A novel route for a preparation of eccentric Au-titania core-shell nanoparticles using gold nanoparticles (AuNPs) with block copolymer shells as a template is reported. AuNPs with poly(2-vinyl pyridine)-block-poly(ethylene oxide) (PVP-b-PEO) block copolymer shells are first prepared by UV irradiation of the solution of PVP-b-PEO/HAuCl(4) complexes. Then the sol-gel reaction of titanium tetra-isopropoxide (TTIP) selectively on the surfaces of AuNPs leads to Au-titania core-shell composite nanoparticles. The eccentric Au-titania core-shell nanoparticles are obtained from the Au-titania core-shell composite nanoparticles by removal of organic interlayer by UV treatment. Photocatalytic activities of the resulting eccentric core-shell nanoparticles are investigated in terms of the degradation of methylene blue (MB). The results show that the eccentric core-shell structures endow the catalyst with greatly enhanced photocatalytic activity.
本文报道了一种新颖的方法，通过使用具有嵌段共聚物壳的金纳米粒子（AuNPs）作为模板，制备偏心 Au-二氧化钛核壳纳米粒子。首先，通过紫外光辐照 PVP-b-PEO/HAuCl(4) 配合物的溶液制备具有聚（2-乙烯基吡啶）-嵌段-聚（氧化乙烯）（PVP-b-PEO）嵌段共聚物壳的 AuNPs。然后，钛四异丙醇酯（TTIP）的溶胶-凝胶反应选择性地在 AuNPs 表面上进行，导致 Au-二氧化钛核壳复合纳米粒子的形成。通过紫外处理去除有机夹层，从 Au-二氧化钛核壳复合纳米粒子中得到偏心 Au-二氧化钛核壳纳米粒子。通过亚甲基蓝（MB）的降解考察了所得偏心核壳纳米粒子的光催化活性。结果表明，偏心核壳结构赋予催化剂极大增强的光催化活性。
