National Center for Nanoscience and Technology, Beijing 100190, PR China.
Langmuir. 2010 Mar 16;26(6):4443-8. doi: 10.1021/la9034968.
An effective way is developed to fabricate AgPt alloy nanoislands on gold nanorods based on the galvanic replacement between Ag and PtCl(4)(2-) in the presence of cetyltrimethylammonium bromide (CTAB). The optical and catalytic properties benefit from the porous structure composed of AgPt nanoislands. A large red shift (265 nm) after etching is observed for longitudinal surface plasmon resonance (SPR) in comparison with Au@Pt0.1@Ag. Alloy compositions in bulk miscibility gap can be obtained and finely tuned from Ag(0.56)Pt(0.44) to Ag(0.38)Pt(0.62). A unique composition dependence is found for both electrocatalytic oxidation of methanol and catalytic oxidation of o-phenylenediamine (OPD) by hydrogen peroxide. In both systems, the highest catalytic activity is achieved at the alloy composition of Pt(0.62)Ag(0.38). Proper alloying with Ag not only improves the CO poisoning of Pt catalyst but also enhances the catalytic activity greatly.
一种有效的方法是在十六烷基三甲基溴化铵（CTAB）的存在下，通过 Ag 和 PtCl(4)(2-)之间的电置换反应，在金纳米棒上制造 AgPt 合金纳米岛。光学和催化性能得益于由 AgPt 纳米岛组成的多孔结构。与 Au@Pt0.1@Ag 相比，纵向表面等离激元共振（SPR）在蚀刻后出现了较大的红移（265nm）。可以获得和精细调整大块混溶性间隙中的合金组成，从 Ag(0.56)Pt(0.44)到 Ag(0.38)Pt(0.62)。在甲醇的电化学氧化和过氧化氢催化氧化邻苯二胺（OPD）这两种体系中，都发现了独特的组成依赖性。在这两种体系中，在合金组成 Pt(0.62)Ag(0.38)下，获得了最高的催化活性。适当的 Ag 合金化不仅可以提高 Pt 催化剂的 CO 中毒，而且还可以大大提高催化活性。
