Xu Yanyan, Chen Dairong, Jiao Xiuling
Department of Chemistry, Shandong University, Jinan 250100, People's Republic of China.
J Phys Chem B. 2005 Jul 21;109(28):13561-6. doi: 10.1021/jp051577b.
A simple aqueous solution route was introduced for the fabrication of CuO pricky microspheres (CPMs) using CuCl(2) x 2H(2)O, Na(2)(C(4)H(4)O(6)) x 3H(2)O and NaOH as starting materials. The CPMs were composed of compressed nanothorns exhibiting tapering feature with tip size of less than 10 nm, and the size of CPMs could be tuned from 100-200 nm to 4-6 microm. The effects of the molar ratios of tartrate anions and NaOH to Cu(2+) cations, reagent concentration, and reaction temperature on the products were investigated, showing that the morphology of CPMs was determined by the molar ratio of tartrate to Cu(2+) cations and the size was greatly affected by reagent concentration and the molar ratio of NaOH to Cu(2+) cations in the precursor solution. The fabrication of CPMs went through rapid nucleation of Cu(OH)(2), aggregation and in situ dehydration of Cu(OH)(2), oriented-aggregation-based growth, and normal crystal growth of CuO nanothorns. The nucleation and crystal growth were successfully separated by controlled releasing of Cu(2+) and OH(-) ions through the reversible reaction of Cu(2+) cations, OH(-), and C(4)H(4)O(6)(2-) anions.
介绍了一种简单的水溶液法，以CuCl₂·2H₂O、Na₂(C₄H₄O₆)·3H₂O和NaOH为原料制备氧化铜刺状微球（CPMs）。CPMs由压缩的纳米刺组成，这些纳米刺呈现出逐渐变细的特征，尖端尺寸小于10nm，CPMs的尺寸可从100 - 200nm调节到4 - 6μm。研究了酒石酸根阴离子和NaOH与Cu²⁺阳离子的摩尔比、试剂浓度以及反应温度对产物的影响，结果表明CPMs的形貌由酒石酸与Cu²⁺阳离子的摩尔比决定，尺寸受试剂浓度和前驱体溶液中NaOH与Cu²⁺阳离子的摩尔比影响很大。CPMs的制备过程经历了Cu(OH)₂的快速成核、Cu(OH)₂的聚集和原位脱水、基于定向聚集的生长以及CuO纳米刺的正常晶体生长。通过Cu²⁺阳离子、OH⁻和C₄H₄O₆²⁻阴离子的可逆反应控制Cu²⁺和OH⁻离子的释放，成功实现了成核和晶体生长的分离。
