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介绍了一种简单有效的制备银核金壳核壳纳米粒子(Ag@Au NPs)和银/金中空纳米笼(Ag/Au NCs)的合成方法.该方法分为两步:首先合成银纳米粒子(Ag NPs),然后以该银纳米粒子为种子,通过调整溶液的p H,实现上述两种纳米材料的可控合成.之后基于自组装的方法制备得到了银金核壳纳米粒子-氧化石墨烯纳米复合物(Ag@Au NPs-GO)及银/金中空纳米笼-氧化石墨烯纳米复合物(Ag/Au NCs-GO).研究发现,利用静电自组装的方法,Ag/Au NCs比Ag@Au NPs更容易组装到氧化石墨烯上.利用TEM,tAFM,tζ-电位,HAADF-STEM,TGA及XRD等方法对所制备的杂化材料进行了表征.另外,研究了Ag@Au NPs,tAg/Au NCst和Ag/Au NCs-GOt3种纳米材料在催化4-,3-或2-硝基苯酚还原为4-,3-或2-硝基苯胺方面所表现出的催化性质,对比研究发现其催化活性具有如下趋势:Ag/Au NCs-GOt>tAg/Au NCst>tAg@Au NPs.实验结果表明,纳米杂化材料的组分和其提供的有效表面积都对其优异的催化活性起了重要作用.
A simple and effective method for the synthesis of Ag @ Au NPs and Ag / Au NCs was presented.The method was divided into two steps: Firstly, silver nanoparticles (Ag NPs), and then control the synthesis of the two nanomaterials by adjusting the p H of the solution with the silver nanoparticle as seed, and then prepared the silver-gold core-shell nanoparticles by oxidation (Ag @ Au NPs-GO) and silver / gold hollow nanocage / graphene oxide nanostructures (Ag / Au NCs-GO). The results show that Ag / Au NCs- The prepared hybrid materials were characterized by TEM, tAFM, tz-potential, HAADF-STEM, TGA and XRD etc. In addition, Ag The three kinds of nanomaterials @Au NPs, tAg / Au NCs and Ag / Au NCs-GO t are useful in the reduction of 4-, 3- or 2-nitrophenol to 4-, 3- or 2-nitroaniline The results show that the catalytic activity has the following tendency: Ag / Au NCs-GO tAg / Au NCs tAg @ Au NPs. The experimental results show that the nano- Points and their mention The effective surface area of all of their excellent catalytic activity played an important role.