Title :
Simple method for fabrication of CeO2 trigon-like structures and application for methyl-orange sensors
Author :
Zhang, D.E. ; Xie, Qian ; Zhang, X.B. ; Li, Stan Z. ; Han, G.Q. ; Ying, A.L. ; Tong, Z.W.
Author_Institution :
Dept. of Chem. Eng., Huaihai Inst. of Technol., Lianyungang, China
Abstract :
CeO2 triangular microplates were obtained via thermal treatment of triangular precursor, which were synthesised through a convenient precipitation route using Ce(NO3)3??6H2O as the cerium source and NH4NO3 as the mineralising agent. The field emission scanning electron microscopy (FESEM) images show the obtained uniform trigon-like particles with edge lengths ranging from 2 to 5 um. The optical absorption spectrum indicates that the CeO2 trigons have a direct band gap of 3.65 eV. The electrochemical characteristics of the trigon-like CeO2 structures were studied by investigation of cyclic voltammetry (CV). It was found that the CeO2 trigons can greatly improve the electron transfer ability.
Keywords :
cerium compounds; chemical sensors; energy gap; field emission electron microscopy; heat treatment; ion exchange; microsensors; precipitation (physical chemistry); scanning electron microscopy; ultraviolet spectra; visible spectra; voltammetry (chemical analysis); CeO2; CeO2 trigon-like structures; cyclic voltammetry; direct band gap; electrochemical characteristics; electron transfer; field emission scanning electron microscopy; methyl-orange sensors; mineralising agent; optical absorption spectrum; precipitation; thermal treatment; triangular microplates;
Journal_Title :
Micro & Nano Letters, IET
DOI :
10.1049/mnl.2009.0104
