Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX13QR, UK.
Nat Chem. 2011 Jun;3(6):478-83. doi: 10.1038/nchem.1030. Epub 2011 Apr 24.
Core@shell structured bimetallic nanoparticles are currently of immense interest due to their unique electronic, optical and catalytic properties. However, their synthesis is non-trivial. We report a new supramolecular route for the synthesis of core@shell nanoparticles, based on an anion coordination protocol--the first to function by binding the shell metal to the surface of the pre-formed primary metal core before reduction. The resultant gold/palladium and platinum/palladium core@shell nanoparticles have been characterized by aberration-corrected scanning transmission electron microscopy (as well as other techniques), giving striking atomic-resolution images of the core@shell architecture, and the unique catalytic properties of the structured nanoparticles have been demonstrated in a remarkable improvement of the selective production of industrially valuable chloroaniline from chloronitrobenzene.
由于具有独特的电子、光学和催化性能，核壳结构的双金属纳米粒子目前引起了极大的关注。然而，它们的合成并不简单。我们报道了一种基于阴离子配位的新的超分子方法来合成核壳纳米粒子，这是第一个通过在还原之前将壳金属结合到预先形成的主金属核的表面上来起作用的方法。用像差校正扫描电子显微镜（以及其他技术）对得到的金/钯和铂/钯核壳纳米粒子进行了表征，得到了核壳结构的惊人的原子分辨率图像，并且在显著提高从氯代硝基苯选择性生产工业上有价值的氯代苯胺方面，展示了结构化纳米粒子的独特催化性能。
