Photocatalytic Activity of ZnO Nanocrystals Synthesized by Sol-Gel Method
Abstract: Zinc oxide (ZnO) was a new versatile material which has attracted much attention for its excellent optical and electrical properties. In this paper, ZnO nanocrystals were synthesized successfully via a facile sol-gel method, in which zinc acetate was used as zinc source and diethylene glycol was used as solvent. The ZnO nanocrystals with average size of 3.5, 4.7, 5.6, 6.7, and 8.6 nm were obtained by controlling the zinc precursor concentrations, respectively. The products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), XRD pattern revealed that the ZnO nanocrystals are indexed as pure wurtzite phase with good crystallization. Furthermore, the pho-tocatalytic activity of the ZnO nanocrystals was investigated by degradation of the Rhodmine B (RhB), the results demonstrated that the photocatalytic activity of the ZnO nanocrystals was gradually enhanced with the decreasing of particle size.
文章引用: 刘瑜 , 胡勇 (2011) ZnO纳米晶的溶胶–凝胶法合成与光催化性能。 材料科学， 1， 60-64. doi: 10.12677/ms.2011.12012
 徐甲强, 王焕新, 张建荣等. 微波法水解制备纳米ZnO及其气敏特性研究[J]. 无机材料学报, 2004, 19(6): 1441-1445.
 C. L. Yang, J. N. Wang, W. K. Ge, et al. Enhanced ultraviolet emission and optical properties in polyvinyl pyrrolidone surface modified ZnO quantum dots. Journal of Applied Physics, 2001, 90(9): 4489-4493.
 X. W. Sun, J. Z. J. Huang, X. Wang, et al. ZnO nanorod inorganic/organic heterostructure light-emitting diode emitting at 342 nm. NANO Letters, 2008, 8(4): 1219-1223.
 A. Forleoa, L. Franciosoa, S. Caponea, et al. Synthesis and gas sensing properties of ZnO quantum dots. Sensors and Actuators B: Chemical, 2010, 146(1): 111-115.
 C. L. Wu, Q. L. Huang. Synthesis of Na-doped ZnO nanowires and their photocatalytic properties. Journal of Luminescence, 2010, 130(11): 2136-2141.
 Z. W. Pan, S. M. Mahurin, S. Dai, et al. Nanowire array gratings with ZnO combs. Nano Letters, 2005, 5(4): 723-727.
 B. Cheng, E. T. Samulski. Hydrothermal synthesis of one-dimensional ZnO nano-structures with different aspectratios. Chemical Communications, 2004, 40(8): 986-987.
 J. Cembrero, A. Elmanouni, B. Hartiti, et al. Nanocolumnar ZnO films for photovoltaic applications. Thin Solid Films, 2004, 451-452: 198-202.
 D. Bera, L. Qian, S. Sabui, et al. Photoluminescence of ZnO quantum dots produced by a sol-gel process. Optical Materials, 2008, 30(8): 1233-1239.
 杨俊林, 高飞雪, 付贤智. 难降解有机污染物光催化分解到新型催化剂和机理研究[J]. 中国科学基金, 2006, 20(4): 238-240.
 L. W. Zhang, H. Y. Cheng, R. L. Zong, et al. Photocorrosion suppression of ZnO nanoparticles via hybridization with graphite-like carbon and enhanced photocatalytic activity. The Journal of Physical Chemistry C, 2009, 113(6): 2368-2374.
 H. M. Cheng, H. C. Hsu, S. L. Chen, et al. Efﬁcient UV photoluminescence from monodispersed secondary ZnO colloidal spheres synthesized by sol-gel method. Journal of Crystal Growth, 2005, 277(1-4): 192-199.
 K. F. Lin, H. M. Cheng, H. C. Hsu, et al. Band gap variation of size-controlled ZnO quantum dots synthesized by sol-gel method. Chemical Physics Letters, 2005, 409(4-6): 208-211.
 T. Nann, P. Mulvaney. Single Quantum Dots in Spherical Silica Particles. Angewandte Chemie International Edition, 2004, 43(40): 5393-5396.
 T. Mahalingam, V. S. John, G. Ravi, et al. Microstructural characterization of electrosynthesized ZnTe thin films. Crystal Research and Technology, 2002, 37(4): 329-339.
 N. Wang, T. Zhou, J. Wang, et al. Sulﬁde sensor based on the room-temperature phosphorescence of ZnO/SiO2 nanocomposite. Analyst, 2010, 135(9): 2386-2393.
 S. K. Kansal, M. Singh, and D. Sud. Studies on photodegradation of two commercial dyes in aqueous phase using different photocataIysts. Journal of Hazardous Materials, 2007, 141(3): 581-590.
 潘吉浪, 尹荔松, 范海陆等. 纳米ZnO光催化降解有机物研究进展[J]. 纳米材料与应用, 2006, 3(5): 18-21.
 H. F. Lin, S. C. Liao, and S. W. Hung. The dc thermal plasma synthesis of ZnO nanoparticlcs for visible-light photocatalyst. Journal of Photochemistry Photobiology A: Chemistry, 2005, 174(1): 82-87.