Singh Dinesh Pratap, Srivastava Onkar Nath
Department of Physics, Banaras Hindu University, Varanasi 221005, India.
J Nanosci Nanotechnol. 2009 Sep;9(9):5345-50. doi: 10.1166/jnn.2009.1159.
We report the Synthesis of different CuO (ellipsoid, ribbon and sheet like) nanostructures in a solution phase with high yield at low cost bysimple reduction of aqueous solution of copper nitrate with alkaline solution of sodium hydroxide (NaOH). The morphology of the synthesized nanostructures is significantly influenced by the feedingconcentration of alkaline NaOH solution. Cu(OH)2 nanomaterials can be readily obtained by the reduction of Cu(NO3)2 solution with NaOH solution and these synthesized materials obtained atdifferent molar concentration of NaOH solution get transformed into different nanostructures ofCuO by subsequent heat treatment at 80 degrees C for half an hour. Nanoellipsoid, nanoribbon and nanosheet like structures were obtained after heating the copper nitrate solution reduced with 0.25 M, 0.50 M, 0.75 M and 1 M concentrated NaOH solution respectively. Optical absorption spectra and corresponding band gap calculation showed that these nanomaterials have higher band gap than their bulk materials.
我们报道了通过用氢氧化钠（NaOH）碱性溶液简单还原硝酸铜水溶液，在溶液相中以低成本高产率合成不同的CuO（椭球形、带状和片状）纳米结构。合成的纳米结构的形态受到碱性NaOH溶液进料浓度的显著影响。通过用NaOH溶液还原Cu(NO3)2溶液可以很容易地获得Cu(OH)2纳米材料，并且在不同摩尔浓度的NaOH溶液中获得的这些合成材料通过随后在80℃下热处理半小时转化为不同纳米结构的CuO。分别用0.25 M、0.50 M、0.75 M和1 M浓NaOH溶液还原硝酸铜溶液后加热，得到了纳米椭球体、纳米带和纳米片状结构。光吸收光谱和相应的带隙计算表明，这些纳米材料的带隙比其块状材料更高。
