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Application of Infrared Spectrum in Synthesis of NiFe2O4 Nanoparticles
Kong Xiaodong,Zheng Jiasheng
Author NameAffiliationE-mail
Kong Xiaodong Materials College, Huazhong University of Science and Technology, Wuhan 430074; Basic Department, Naval University of Engineering, Wuhan 43003 kxd63813@hotmail.com 
Zheng Jiasheng Materials College, Huazhong University of Science and Technology, Wuhan 430074  
Abstract:
A sol-gel method was used to synthesizeNiFe2O4nanoparticles. The sol solution was prepared through nitrates dissolved in melted citric acid for 30 min by means of an ultrasonic cleaner, maintaining the molar proportion of iron and nickel equal to 2∶1 and joining a little PEG(polyethylene glycol) 200 as the dispersing agent. The sol solution was evaporated at 70℃ for 12 h to formwetgel, then dried at 110℃ in a drying oven for 24 h. The dried gel was annealed at different temperatures. Their composition and structure were measured in the synthesizing process using the infrared absorption-transmittance spectrum. The infrared diffuse reflection spectra and X-ray diffraction (XRD) spectra were measured for the specimens annealed at different temperatures. The average grain sizes were calculated from XRD spectra using Scheer′s equation. It was discussed for the effect of the NiFe2O4 nanoparticle size on infrared diffuse reflection spectra. The results show that the infrared absorption-transmittance spectra can reflect the changes of composition and structure in various stages from sol to heat-treatment and provide basis for the optimum annealed temperature in the synthesis of NiFe2O4with the sol-gel method. The grain sizes are different for the samples annealed at different temperatures and the annealed temperature must be more than 400℃for eliminating organic compounds completely. The higher the temperature, the bigger the grain size and the smaller the Kubelka-Mnnk function (K-M) values. In a certain range of grain sizes, the relationship of grain size and the logarithm of the K-M value is linear. When the grain size is big enough, the K-M value almost doesn′t change and the effect of grain size disappears.
Key words:  Sol-gel method, NiFe2O4 nanoparticle, Infrared absorption-transmittance spectrum, Infrared diffuse reflection spectrum
FundProject:
红外光谱技术在纳米NiFe2O4制备过程中的应用
孔小东*,郑家燊
摘要:
采用溶胶-凝胶法制备NiFe2O4纳米粉末,并经不同温度热处理.测定了制备过程中各阶段的红外吸收光谱和不同温度处理样品的红外漫反射光谱.结果表明,红外吸收光谱较好地反映了溶胶-凝胶法制备NiFe2O4纳米粉末过程中结构的变化,为确定热处理温度提供了实验依据,彻底消除有机物,热处理需在400℃以上;红外漫反射谱可以较好地反映粉末的尺寸效应和形态效应,粉末粒径越小,漫反射函数(K-M)值越大;当粒径达到一定尺寸时,红外漫反射的尺寸效应消失.
关键词:  溶胶-凝胶法  NiFe2O4纳米粉末  红外吸收光谱  红外漫反射谱
DOI:10.1088/1674-0068/16/3/219-222
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