Growth and characterization of erect Ni(OH)2 hexagonal nanodisks on the surfaces of nickel substrates
YANG Rui-li1,2, AN Li-juan1, ZHANG Jian-ying1, YANG He-qing1*
(1 Key Laboratory of Macromolecular Science of Shaanxi Province, College of Chemistry and Materials Science, Shaanxi Normal University, Xi′an 710062, Shaanxi, China; 2 Department of Chemistry, Xianyang Teachers College, Xianyang, 712000, Shaanxi, China)
Abstract:
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 (12 pH) 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 proposed to account for the growth.
KeyWords:
Ni(OH)2; hexagonal nanodisks; hydrothermal method
