Sol-gel preparation and spectroscopic study of the pyrophanite MnTiO_3 nanoparticles  

作　　者：ZHOU Guowei1, KANG Youngsoo2, LI Tianduo1 & XU Guiying3 1. School of Light Chemicals and Environmental Engineering, Shandong Institute of Light Industry, Jinan 250100, China 2. Department of Chemistry, Pukyong National University, Daeyeon-3-dong, Nam-gu, Pusan 608-737, Korea 3. Key Laboratory for Colloid and Interface of Ministry of Education of China, Shandong University, Jinan 250100, China 

出　　处：《Science China Chemistry》2005年第3期210-215,共6页中国科学（化学英文版）

基　　金：the National Natural Science Foundation of China(Grant No.29973023);the Key Project of Chinese Ministry of Education(No.205088);the Scientific Research Bonus Foundation for Young and Middle-aged Scientists of Shandong Province(No.2004BS04009); the Foundation of Key Laboratory of Colloid and Interface Chemistry(Shandong University);Ministry of Education.

摘　　要：The nanosized xerogel of titanium dioxide (TiO2) and manganese oxides (MnO2, Mn2O3, Mn3O4) was prepared by the sol-gel method using manganese chloride (MnCl2·4H2O) and titanium isopropoxide (Ti(O-iPr)4) as precursors in cetyltrimethylammonium bromide (CTAB)/ ethanol/H2O/HCl micelle solutions, following the calcinations of the produced powders at differ-ence temperatures. The nanostructure and phase composition of these nanoparticles were characterized with X-ray powder diffraction (XRD), transmission electron microscopy (TEM), en-ergy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The spectroscopic characterizations of these nanoparticles were also done with UV-Vis spectroscopy and laser Raman spectroscopy (LRS). XRD patterns show that the pyrophanite MnTiO3 phase was formed at the calcinations temperature of 900℃. The TEM images show that the nanoparti-cles are almost spherical or slight ellipose and the sizes are 50 nm on average. The UV-Vis spectra show that the nanosized MnTiO3 have significant absorption bands in the visible region. There are new absorption peaks of MnTiO3 nanoparticles in LRS compared with the pure TiO2 powder.The nanosized xerogel of titanium dioxide (TiO2) and manganese oxides (MnO2, Mn2O3, Mn3O4) was prepared by the sol-gel method using manganese chloride (MnCl2·4H2O) and titanium isopropoxide (Ti(O-iPr)4) as precursors in cetyltrimethylammonium bromide (CTAB)/ ethanol/H2O/HCl micelle solutions, following the calcinations of the produced powders at differ-ence temperatures. The nanostructure and phase composition of these nanoparticles were characterized with X-ray powder diffraction (XRD), transmission electron microscopy (TEM), en-ergy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The spectroscopic characterizations of these nanoparticles were also done with UV-Vis spectroscopy and laser Raman spectroscopy (LRS). XRD patterns show that the pyrophanite MnTiO3 phase was formed at the calcinations temperature of 900℃. The TEM images show that the nanoparti-cles are almost spherical or slight ellipose and the sizes are 50 nm on average. The UV-Vis spectra show that the nanosized MnTiO3 have significant absorption bands in the visible region. There are new absorption peaks of MnTiO3 nanoparticles in LRS compared with the pure TiO2 powder.

关 键 词：pyrophanite MnTiO3  nanoparticles  spectroscopy  CTAB micelle  sol-gel. 

分 类 号：O614[理学—无机化学]