Hybrid PdAg alloy-Au nanorods： Controlled growth, optical properties and electrochemical catalysis  

作　　者：Qiao Zhang Xia Guo Zhenxing Liang Jianhuang Zeng Jian Yang Shijun Liao 

机构地区：[1]School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou S 10640, China [2]Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou 510640, China [3]Department of Chemistry, Shandong University, Jinan 250100, China

出　　处：《Nano Research》2013年第8期571-580,共10页纳米研究（英文版）

基　　金：This work was supported by the Natural Science Foundation of China （Nos. 20801019, 21071055, 21172076）, New Century Excellent Talents in University （No. NCET-10-0369）, Shandong Provincial Natural Science Foundation for Distinguished Young Scholar （No. JQ201205）, Independent Innovation Foundations of Shandong University （No. 2012 ZD007）, new-faculty start-up funding in Shandong University and Key Laboratory of Fuel Cell Technology of Guangdong Province.

摘　　要：Controllable growth of high-quality hybrid nanostructures is highly desirable for the fabrication of hierarchical, complex and multifunctional devices. Here, PdAg alloys have been controllably grown at different locations on gold nanorods, producing dumbbell-like nanostructures with PdAg at the ends of the gold nanorods or branched nanostructures with PdAg grown almost perpendicular to the gold nanorods. The nucleation sites of PdAg alloys on the gold nanorods can be effectively tuned by varying the concentrations of H2PdC14, AgNO3 and cetyltrimethylammonium bromide （CTAB）. The dumbbell-like and branched nanostructures were characterized by transmission electron microscopy （TEM）, high-resolution TEM （HRTEM）, line-scanning energy-dispersive X-ray spectros-copy （EDS）, X-ray photoelectron spectroscopy （XPS） and UV-Vis absorption spectroscopy. Their electrocatalytic performance was evaluated using ethanol oxidation as a probe reaction. The dumbbelMike nanostructures show a better anti-poisoning performance, but a worse electrochemical activity than the branched ones. The results provide guidelines for the controlled growth of complicated nanostructures for either fundamental studies or potential applications.高质量的混合 nanostructures 的可控制的生长为层次、复杂、多功能的设备的制造是高度合乎需要的。这里， PdAg 合金在金 nanorods 上的不同地点是 controllably 成年的，生产有在金牌的结束的 PdAg 的像哑铃的 nanostructures 有种的 PdAg 的 nanorods 或分叉的 nanostructures 对金 nanorods 几乎垂直。金 nanorods 上的 PdAg 合金的成核地点能被改变 H2PdCl4， AgNO3 和 cetyltrimethylammonium 溴化物(CTAB ) 的集中有效地调节。像哑铃、分叉的 nanostructures 被传播描绘电子显微镜学(TEM ) ，高分辨率的 TEM (HRTEM ) ，扫描线的精力散的 X 光检查光谱学(版本) ， X 光检查光电子光谱学(XPS ) 和紫外力的吸收光谱学。他们的 electrocatalytic 表演作为探查反应用乙醇氧化被评估。像哑铃的 nanostructures 比分叉的显示出更好毒害反的表演，而是一项更坏的电气化学的活动。结果为基本研究或潜在的应用为复杂 nanostructures 的控制生长提供指南。

关 键 词：NANOSTRUCTURES hybrid materials METALS controlled growth electrochemical catalysis optical properties 

分 类 号：TQ051.72[化学工程] TB383[一般工业技术—材料科学与工程]