In:
International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 24, No. 15n16 ( 2010-06-30), p. 2291-2296
Abstract:
Nanosheets of cobalt and nickel hydroxides nanosheets were prepared by delamination of layered compounds, Co II ( OH ) 1.73 ( DBS ) 0.27 ·0.87 H 2 O ( Co - DBS , DBS = dodecylbenzene sulfonate) and Ni II ( OH ) 1.63 ( DBS ) 0.37 ·1.24 H 2 O ( Ni - DBS ), respectively. Powder X-ray diffraction analyses of the layered compounds revealed lattice parameters of a 0 = 3.07 Å and c 0 = 30 Å ( Co - DBS ) and a 0 = 3.09 Å and c 0 = 30 Å ( Ni - DBS ) in the hexagonal system. Dispersions of Co - DBS and Ni - DBS in 1-butanol produced colloidal solutions of nanosheets, [ Co - DBS ] delam and [ Ni - DBS ] delam , respectively. Poly(vinylpyrrolidone) ( PVP ) was dissolved in [ Co - DBS ] delam and [ Ni - DBS ] delam and the mixtures were dried to yield Co - PVP and Ni - PVP , respectively. These nanosheets measured 150-500 nm for [ Co - DBS ] delam and 135-400 nm for [ Ni - DBS ] delam by means of dynamic light scattering. Atomic force microscopy images showed lateral dimensions of 100-500 nm for [ Co - DBS ] delam and 50-100 nm for [ Ni - DBS ] delam . In the former image, the cobalt hydroxide nanosheets had a fairly flat terrace structure with thickness of 3.1-3.6 nm and with aspect ratios of 30-150, whereas in the latter image dome-like nanosheets of nickel hydroxide with height of 2.2-2.3 nm were confirmed. These nanosheets were regarded as monolayer. Magnetization experiments at 1.8 K showed hysteresis loops for Co - DBS , Co - PVP , Ni - DBS , and Ni - PVP .
Type of Medium:
Online Resource
ISSN:
0217-9792
,
1793-6578
DOI:
10.1142/S0217979210064812
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
2010
Permalink