State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, China.
ACS Nano. 2014 Jun 24;8(6):5953-8. doi: 10.1021/nn501086k. Epub 2014 Jun 11.
Convex hexoctahedral nanocrystals have been synthesized through fast growth kinetics and the use of cetylpyridinium chloride as a capping agent. Monodisperse convex hexoctahedral Pd@Au core-shell nanocrystals with {431} high-index facets are obtained at high reaction rates by using high concentrations of ascorbic acid in the presence of cetylpyridinium chloride. In contrast, octahedral nanocrystals with {111} low-index facets and their {100}-truncated counterparts are formed at low ascorbic acid concentrations. The substitute of cetylpyridinium chloride with cetyltrimethylammonium chloride leads to the generation of concave trisoctahedral Pd@Au core-shell nanocrystals with {331} high-index facets, indicating that cetylpyridinium plays an important role in the formation of convex hexoctahedral nanocrystals. The as-prepared convex hexoctahedral Pd@Au core-shell nanocrystals exhibit remarkable catalytic performances toward electrochemiluminescence compared with truncated octahedral and concave trisoctahedral Pd@Au core-shell nanocrystals.
通过快速生长动力学和使用十六烷基吡啶氯作为封端剂，合成了凸八面体纳米晶体。在十六烷基吡啶氯存在下，使用高浓度抗坏血酸，在高反应速率下获得具有{431}高指数面的单分散凸八面体 Pd@Au 核壳纳米晶体。相比之下，在低抗坏血酸浓度下形成具有{111}低指数面的八面体纳米晶体及其{100}截断的对应物。用十六烷基三甲基氯化铵代替十六烷基吡啶氯会导致具有{331}高指数面的凹三角八面体 Pd@Au 核壳纳米晶体的生成，表明十六烷基吡啶在凸八面体纳米晶体的形成中起着重要作用。与截角八面体和凹三角八面体 Pd@Au 核壳纳米晶体相比，所制备的凸八面体 Pd@Au 核壳纳米晶体在电化学发光方面表现出显著的催化性能。
