金属镍基质上六边形Ni(OH)2纳米片的生长与表征

Growth and characterization of erect Ni(OH)_2 hexagonal nanodisks on the surfaces of nickel substrates

通过金属镍片与草酸钠的碱性溶液（pH值为12）140℃水热反应24 h,在金属镍片表面原位生长出大面积直立的六边形Ni（OH）2纳米片.采用X射线衍射仪、扫描电镜和透射电子显微镜对产物进行了表征.结果表明,六边形Ni（OH）2纳米片为六方相单晶结构,厚200～500 nm,对角线长度1.6～3.6μm.Ni（OH）2纳米片的产量和尺寸随着反应体系中乙醇与水体积比的增加而降低,研究了草酸钠在六边形Ni（OH）2纳米片形成过程中的作用.

Erect Ni （OH）2 hexagonal nanodisks were grown directly on the surfaces of Nickel substrates on a large scale through a simple hydrothermal reaction of Ni with Na2C2O4 in NaOH solution （12pH） at 140℃ for 24 h. The as-synthesized products were characterized by means of powder X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the Ni（OH）2 nanodisks are single crystalline phase with the hexagonal structure, and have perfect hexagonal shape with typical diagonals of 1.6 to 3.6 μm and thickness of 200 to 500 nm. The yield and size of Ni （OH）2 hexagonal nanodisks are decreased by increasing the C2H5OH/H2O volume ratio in the hydrothermal system. The role of Na2C2O4 in the formation of Ni （OH）2 hexagonal nanodisks was investigated, and a possible mechanism was also to account for the growth.