共沉淀法制备六方相ITO纳米粉体及其光电性能
Hexagonal-Type ITO Nanopowders: Coprecipitation Synthesis and Photoelectric Property
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张怡青 北京化工大学化工资源有效利用国家重点实验室, 材料电化学过程与技术北京市重点实验室, 北京 100029  
刘家祥 北京化工大学化工资源有效利用国家重点实验室, 材料电化学过程与技术北京市重点实验室, 北京 100029 ljxpost@263.net 
摘要: 以金属In、SnCl45H2O为原料、尿素为沉淀剂,采用共沉淀法加入(NH42SO4,制备出六方相ITO纳米粉体。通过XRD、TEM、四探针电阻仪、荧光光谱仪以及XPS,研究了ITO粉体的晶型、颗粒形貌、电性能以及光性能。结果表明:加入(NH42SO4后,ITO粉体形貌由类菱面体和类球形混合体转变为类球形;不加(NH42SO4时晶型为立方相结构,当(NH42SO4与铟的物质的量之比为1:3.45和1:1.73时粉体晶型转变为六方相结构,继续添加(NH42SO4晶型又转变为立方相结构。立方相ITO粉体的电阻率较低为0.64 Ωcm,六方相ITO粉体在相同激发波长下,发射光强度相对较高。
关键词: 六方氧化铟锡  (NH4)2SO4  共沉淀法  纳米粉体  光电性能
基金项目: 北京市自然科学基金(No.2142025)资助项目。
Abstract: Hexagonal-type ITO powders were prepared by coprecipitation method, In and SnCl4·5H2O as raw materials, urea as precipitant and added (NH4)2SO4 for dispersing. The powders' crystal shape, particle morphology, electronic and optical properties were characterized by XRD, TEM, four point probe resistance meter, optical spectral luminous apparatus and XPS. The experimental results show that with the increase amount of (NH4)2SO4, powders' morphology and phase structure are changed, the morphology changes from octahedral with spherical ball to spherical ball; Without adding (NH4)2SO4, ITO crystal type is cubic phase. When the molar ratios of (NH4)2SO4 to In are 1:3.45 and 1:1.73, the ITO crystal type turns into hexagonal phase.Continue to add (NH4)2SO4, the crystal type transforms into cubic phase structure. Cubic phase ITO shows a better electrical performance with low resistivity of 0.64 Ω·cm. Under the same excitation wavelength, hexagonal phase ITO emission light intensity is higher.
Keywords: h-ITO  (NH4)2SO4  coprecipitation method  nanopowders  photoelectric property
投稿时间:2016-07-11 修订日期:2016-11-26
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