期刊
SOLID STATE COMMUNICATIONS
卷 148, 期 1-2, 页码 32-37出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2008.07.020
关键词
nanostructures; chemical synthesis; crystal structure; electron paramagnetic resonance
In this work we describe and discuss the synthesis, (micro)structure (XRD, SEM) and EPR of Co3O4 (normal spinet structure with a = 0.808 nm) nanoparticles synthesized by urea-based cornbustion method using cobalt nitrate precursor. Fuel-to-oxidizer ratio (Psi) is used as a control parameter to investigate how lattice parameter, particle size and EPR susceptibility vary with Psi = 0.25-2 in steps of 0.25. The average crystalline size Of CO3O4 was estimated from the X-ray diffraction peaks of powders using Scherrer's formula and Williamson-Hall equation. The average crystalline size varies from 7(+/- 0.1) nm to 18(+/- 0.28) nm. The surface areas were measured using BET method and size of the particles thus deduced agree with XRD based values. The FT-IR confirms formation of Co3O4. We also calculated average micro strain of the Co3O4 nanoparticles with varying Psi. The SEM micrographs give evidence for increased porosity upon increasing P. EPR spectra has yielded the paramagnetic susceptibility of the Co3O4 nanoparticles. Band gap of Co3O4 nanoparticles was determined by UV-visible absorption edge. (C) 2008 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据