AuPd bimetallic nanoparticles decorated on graphene nanosheets: their green synthesis, growth mechanism and high catalytic ability in 4-nitrophenol reduction
AuPd bimetallic nanoparticles decorated on graphene nanosheets: their green synthesis, growth mechanism and high catalytic ability in 4-nitrophenol reduction
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石墨烯纳米片上修饰的AuPd双金属纳米粒子：其绿色合成、生长机制和4-硝基苯酚还原的高催化能力
DOI：
10.1039/c3ta15141g
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发表时间：
2014-01-01
影响因子：
11.9
通讯作者：
Oyama, Munetaka
中科院分区：
文献类型：
--
作者：
Chen, Xiaomei;Cai, Zhixiong;Oyama, Munetaka
报道了用一锅绿法合成单分散在石墨烯纳米片上的超细AuPd纳米颗粒的方法。由于GNs具有还原能力，沉积位点数量适中，表面积大，因此在该合成中被用作还原剂、稳定剂和载体等三功能剂。采用透射电子显微镜（TEM）、高分辨率透射电子显微镜（TEM）、能量色散x射线能谱和x射线光电子能谱对制备的AuPdNPs/GNs的形貌、结构和组成进行了表征。由于是无表面活性剂的形成过程，所制备的AuPdNPs/GNs非常干净，并且对4-硝基苯酚具有很高的还原活性。此外，AuPdNPs/GNs复合材料的光学性质和催化活性可以在合成过程中通过控制Au与Pd的原子比来调节。双金属AuPdNPs/GNs复合材料的催化活性比单金属AuNPs/GNs和PdNPs/GNs复合材料明显增强。这种简单的方法对于在石墨烯基材料上沉积具有高催化性能的双金属NPs具有重要意义。
A one-pot green method to synthesize ultrafine AuPd nanoparticles (NPs) monodispersed on graphene nanosheets (GNs) is reported. Due to the reducing capability, moderate number of deposition sites and large surface area, GNs are used as a three-functional agent such as reductant, stabilizer and support in this synthesis. The morphology, structure and composition of thus-prepared AuPdNPs/GNs were characterized by transmission electron microscopy (TEM), high resolution TEM, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. As it is a surfactant-free formation process, the as-prepared AuPdNPs/GNs are very clean and can exhibit a high activity towards the reduction of 4-nitrophenol. Moreover, the optical properties and catalytic activities of the AuPdNPs/GNs composite are tunable via controlling the Au versus Pd atomic ratio during their synthesis. The catalytic activity of bimetallic AuPdNPs/GNs composites is highly enhanced over the monometallic AuNPs/GNs and PdNPs/GNs composites. This straightforward method is of significance for deposition of bimetallic NPs with high catalytic performance on graphene-based materials.