Fabrication of CuO pricky microspheres with tunable size by a simple solution route.
Fabrication of CuO pricky microspheres with tunable size by a simple solution route.
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DOI：
10.1021/jp051577b
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发表时间：
2005-06
期刊：
影响因子：
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通讯作者：
Yanyan Xu;Dairong Chen;X. Jiao
中科院分区：
文献类型：
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作者：
Yanyan Xu;Dairong Chen;X. Jiao
以CuCl2 x2H2O、Na2(2)(C(4)H4O(6))x3H2O和NaOH为原料，采用简单的水溶液法制备CuO针状微球。CPM由尖端尺寸小于10 nm的具有锥形特征的压缩纳米球组成，其尺寸可在100-200 nm到4-6微米之间调节。考察了酒石酸阴离子与NaOH与Cu2+的摩尔比、试剂浓度和反应温度对产物的影响，结果表明，酒石酸与Cu2+的摩尔比决定了CPMS的形貌，而前驱体溶液中的试剂浓度和NaOH与Cu2+的摩尔比对产物的大小有很大的影响。纳米氧化铜的制备经历了氢氧化铜的快速成核、氢氧化铜的聚集和原位脱水、定向聚集生长和氧化铜纳米颗粒的正常生长。通过Cu(2+)、OH(-)和C(4)H(4)O(6)(2-)阴离子的可逆反应，成功地控制了Cu2+和OH(-)离子的释放，成功地分离了成核和晶体生长。
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.