Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis and optical property of onedimensional spinel ZnMn2O4 nanorods | Zhang et al. Nanoscale Research Letters 2011 6 323 http content 6 1 323 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Synthesis and optical property of onedimensional spinel ZnMn2O4 nanorods Pan ZhangH Xinyong Li1 2 f Qidong Zhao1t and Shaomin I iu Abstract Spinel zinc manganese oxide ZnMn2O4 nanorods were successfully prepared using the previously synthesized a-MnO2 nanorods by a hydrothermal method as template. The nanorods were characterized by X-ray diffraction scanning electron microscopy transmission electron microscopy UV-Vis absorption X-ray photoelectron spectroscopy surface photovoltage spectroscopy and Fourier transform infrared spectroscopy. The ZnMn2O4 nanorods in well-formed crystallinity and phase purity appeared with the width in 50-100 nm and the length in pm. They exhibited strong absorption below 500 nm with the threshold edges around 700 nm. A significant photovoltage response in the region below 400 nm could be observed for the nanorods calcined at 650 and 800 C. Introduction Spinel is an important class of mixed-metal oxides which has the general chemical composition of AB2O4. In recent years mixed transition-metal oxides with spinel structure have attracted much attention owing to their various properties such as photocatalytic 1-4 electrochemical performance 5 magnetic 6 7 properties or being used as lithium ion batteries 8 . Mn-doped ZnO has also aroused lots of interest because it had been predicted to be a room-temperature diluted magnetic semiconductor 9 which was later verified by experiments. Therefore the Mn-Zn-O ternary systems belong to a class of interesting and useful materials in terms of their electrical and magnetic properties. As one of the important mixed transition-metal oxides with spinel structure ZnMn2O4 is a promising functional material and has become the focus of various researches owing to its potential applications. ZnMn2O4 could be used for the negative .