Kaur Ravneet, Giordano Cristina, Gradzielski Michael, Mehta Surinder K
Department of Chemistry and Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh-160014 (India), Fax: (+91) 172-2545074; Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, Sekr. TC7, 10623 Berlin (Germany), Fax: (+49) 30-314-26602.
Chem Asian J. 2014 Jan;9(1):189-98. doi: 10.1002/asia.201300809. Epub 2013 Oct 7.
We report an aqueous-phase synthetic route to copper nanoparticles (CuNPs) using a copper-surfactant complex and tests of their catalytic efficiency for a simple nitrophenol reduction reaction under atmospheric conditions. Highly stable, water-dispersed CuNPs were obtained with the aid of polyacrylic acid (PAA), but not with other dispersants like surfactants or polymethacrylic acid (PMAA). The diameter of the CuNPs could be controlled in the range of approximately 30-85 nm by modifying the ratio of the metal precursor to PAA. The catalytic reduction of p-nitrophenol to p-aminophenol takes place at the surface of CuNPs at room temperature and was accurately monitored by UV/Vis spectroscopy. The catalytic efficiency was found to be remarkably high for these PAA-capped CuNPs, given the fact that at the same time PAA is efficiently preventing their oxidation as well. The activity was found to increase as the size of the CuNPs decreased. It can therefore be concluded that the synthesized CuNPs are catalytically highly efficient in spite of the presence of a protective PAA coating, which provides them with a long shelf life and thereby enhances the application potential of these CuNPs.
我们报道了一种使用铜 - 表面活性剂络合物制备铜纳米颗粒（CuNPs）的水相合成路线，并测试了它们在大气条件下对简单的硝基苯酚还原反应的催化效率。借助聚丙烯酸（PAA）获得了高度稳定、水分散的CuNPs，但使用表面活性剂或聚甲基丙烯酸（PMAA）等其他分散剂则无法获得。通过改变金属前驱体与PAA的比例，CuNPs的直径可控制在约30 - 85 nm范围内。对硝基苯酚在室温下于CuNPs表面催化还原为对氨基苯酚，并通过紫外/可见光谱进行精确监测。鉴于PAA同时能有效防止CuNPs氧化，发现这些PAA包覆的CuNPs的催化效率非常高。发现活性随着CuNPs尺寸的减小而增加。因此可以得出结论，尽管存在保护性的PAA涂层，合成的CuNPs仍具有高效催化性能，这赋予了它们较长的保质期，从而增强了这些CuNPs的应用潜力。
