硼酸镍纳米棒溶胶-凝胶法合成及表征

Sol-gel Synthesis,Characterization of Nickel Borate Nanorods

以硝酸镍、硼酸和柠檬酸为原料,采用溶胶凝胶法于150℃形成咖啡色干凝胶,再于750℃焙烧得到硼酸镍纳米棒。采用XRD、SEM、TEM和FTIR对产物结构和形貌进行表征。结果表明产物为分布均匀的Ni3(BO3)2纳米棒,纳米棒的长度受硝酸镍和硼酸的物质的量之比影响,硼酸用量越大,长度越大。当nNi(NO3)2∶nH3BO3=1∶3时,纳米棒直径为200～300 nm,长度为2～3μm。对硼酸镍纳米棒的生长机理进行了探讨,结果表明,柠檬酸与镍离子反应产生网状结构的配合物,促使镍源均匀地分散在网格间,为硼酸镍纳米棒的生成提供有利的反应空间。

Nickel borate（Ni3（BO3）2） nanorods were synthesized by the sol-gel method using nickel nitrate and boric acid as reactants,citric acid as the foaming agent.The structure and morphologies of the synthesized samples were investigated by XRD,FTIR,SEM and TEM techniques.The length and diameter of the nanorods were controlled by adjusting the molar ratio of Ni（NO3）2/H3BO3.The diameters of the nanorods were in the range of 200～300 nm and the lengths were in the range of 2～3 μm with nNi（NO3）2：nH3BO3=1∶3.The role of the citric acid in the growth of nanorods was also discussed,and the results show that the reaction of citric acid and nickel ions will form coordination compound in mesh structure,thus prompting even dispersion of nickel between the grid and providing favorable response space for the formation of nickel borate nanorod.