Deng Chonghai, Hu Hanmei, Ge Xinqing, Han Chengliang, Yang Benhong
Department of Chemical and Materials Engineering, Hefei University, Hefei 230022, China.
J Nanosci Nanotechnol. 2012 Apr;12(4):3150-3. doi: 10.1166/jnn.2012.5841.
Hierarchical semiconductor CuO nanotablets with pores have been fabricated on a large scale by a facile and one-pot sonochemical process using the copper acetate and ammonia aqueous solution as precursor in the absence of surfactants or additives. The as-synthesized products were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM), selected area electron diffraction (SAED), and N2 physisorption. The results reveal that porous tablet-shaped CuO nanostructures composed of nanoribbons possess a monoclinc phase CuO with the average diameters about 200 nm and around 50 nm in thickness. The Brunnauer-Emmett-Teller (BET) specific surface area and the single point adsorption total pore volume were measured to be 26.8 m2/g and 0.083 cm3/g, respectively. The band-gap energies were estimated to be 2.52 eV from a UV-vis absorption spectrum, which showed the quantum size effects of the nanosized semiconductors. A possible mechanism for porous CuO nanotablets was discussed.
通过一种简便的一锅法超声化学工艺，以醋酸铜和氨水水溶液为前驱体，在无表面活性剂或添加剂的情况下，大规模制备了具有孔隙的分级半导体CuO纳米片。采用X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）、选区电子衍射（SAED）和N2物理吸附对合成产物进行了表征。结果表明，由纳米带组成的多孔片状CuO纳米结构具有单斜相CuO，平均直径约200 nm，厚度约50 nm。测得Brunauer-Emmett-Teller（BET）比表面积和单点吸附总孔体积分别为26.8 m2/g和0.083 cm3/g。通过紫外可见吸收光谱估计带隙能量为2.52 eV，这显示了纳米半导体的量子尺寸效应。讨论了多孔CuO纳米片的可能形成机理。
