Title: Size-controlled synthesis of β-Co(OH)₂ hexagonal nanoplates and their conversion into CoO octahedrons using cobalt naphthenate under solvothermal conditions

Authors: Qiang Dong; Shu Yin; Chongshen Guo; HuiHui Li; Yunfang Huang; Nobuhiro Kumada; Takahiro Takei; Yoshinori Yonesaki; Tsugio Sato

Addresses: Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan; Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Miyamae cho-7, Kofu 400-8511, Japan. ' Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan. ' Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan. ' Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan. ' Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan. ' Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Miyamae cho-7, Kofu 400-8511, Japan. ' Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Miyamae cho-7, Kofu 400-8511, Japan. ' Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Miyamae cho-7, Kofu 400-8511, Japan. ' Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan

Abstract: β-Co(OH)₂ hexagonal nanoplates with a size range from 300 nm to 3 μm have been synthesised successfully by a template and surfactant-free solvothermal route in a very simple system composed only of water, LiOH and cobalt naphthenate in xylene solution. This method is high-yield, simple and environmentally benign. The as-obtained Co(OH)₂ hexagonal nanoplates can be easily converted into CoO octahedrons with the size of 15 μm by increasing reaction temperature.

Keywords: beta-Co(OH)2; nanoplates; cobalt naphthenate; solvothermal; CoO octahedrons; nanotechnology; synthesis; cobalt hydroxide; cobalt(II) oxide; cobalt monoxide.

DOI: 10.1504/IJNT.2013.050883

International Journal of Nanotechnology, 2013 Vol.10 No.1/2, pp.71 - 79

Published online: 07 Dec 2012 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article