Fabrication of palladium-copper nanoparticles with controllable size and chemical composition
Fabrication of palladium-copper nanoparticles with controllable size and chemical composition
复制标题
尺寸和化学成分可控的钯铜纳米颗粒的制备
DOI：
10.1016/j.jcis.2018.04.109
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发表时间：
2018
影响因子：
9.9
通讯作者：
Wenjie Shen
中科院分区：
文献类型：
--
作者：
Shuang Liu;Yong Li;Na Ta;Yan Zhou;Yongbin Wu;Mingrun Li;Shu Miao;Wenjie Shen
通过两步多元醇还原法制备了一系列尺寸为7-9 nm的PdxCu 100 −x（x = 20，40，60，80）颗粒，该方法区分了纳米颗粒的成核和生长步骤。在393 K下，Pd 2+被乙二醇还原形成了大量的Pd 0核，而在473 K下，Pd 2+和Cu 2+在初始形成的Pd核晶种的帮助下被完全还原.同时，释放油胺，预先与金属阳离子配位，作为封端剂分离的纳米粒子。这两个参数同时控制了纳米粒子的组装动力学，并导致均匀的尺寸和设计的化学组成。其中，Pd_（80）Cu_（20）纳米粒子在温和条件下对硝基苯的加氢反应表现出较好的催化活性和选择性。
A series of PdxCu100−x(x = 20, 40, 60, 80) particles with the sizes of 7–9 nm were fabricated by a two-step polyol reduction process, which differentiated the nucleation and growth steps of the nanoparticles. The primary reduction of Pd2+by ethylene glycol at 393 K formed appreciable amounts of Pd0nuclei, while the subsequent reduction at 473 K fully reduced the Pd2+and Cu2+species with the aid of the initially formed Pd nuclei seeds. Meanwhile, the releasing oleylamine, previously coordinated with metal cations, acted as the capping agent to segregate the nanoparticles. Both parameters simultaneously controlled the assembly kinetics of the bimetallic nanoparticles and resulted in uniform sizes and designed chemical compositions. Among them, the Pd80Cu20nanoparticles showed quite promising activity and selectivity for the hydrogenation of nitrobenzene under mild conditions.