tailieunhanh - Báo cáo hóa học: " Synthesis and optical property of onedimensional spinel ZnMn2O4 nanorods"

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 .