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Title: Microwave hydrothermal synthesis of nanoporous cobalt oxides and their gas sensing properties

Abstract

Graphical abstract: Photographs taken at the field emission scanning electron microscope of (a) nanosheet-like Co{sub 3}O{sub 4}, (b) nanochain-like Co{sub 3}O{sub 4} and (c) nanoring-like Co{sub 3}O{sub 4}. Highlights: {yields} CO{sub 3}{sup 2-} acts as an inhibitor that affects the growth rates of precursors in different crystal directions. {yields} Nanosheet-like Co{sub 3}O{sub 4}, nanochain-like Co{sub 3}O{sub 4}, and nanoring-like Co{sub 3}O{sub 4} were obtained by microwave hydrothermal process under different precipitants and synthetic conditions. {yields} Specific surface area of nano Co{sub 3}O{sub 4} with various morphologies plays an important role in gas sensitivity to alcohol. -- Abstract: In this paper, the precursors were synthesized by microwave hydrothermal method using Co(NO{sub 3}){sub 2}.6H{sub 2}O as raw material, CO(NH{sub 2}){sub 2} and KOH as precipitants, respectively. The precursors and calcined products were characterized by XRD, FESEM, and BET-BJH. The results show that both constituent and synthetic condition can determine the products morphology. When using KOH as precipitant, hollow Co{sub 3}O{sub 4} nanorings were obtained whose precursor was synthesized at 140 {sup o}C for 3 h and calcined at 500 {sup o}C in air for 2 h. While using CO(NH){sub 2}, Co{sub 3}O{sub 4} like-nanochains were obtained whose precursor was synthesized at 110more » {sup o}C for 1 h and calcined at 420 {sup o}C in air for 2 h, and Co{sub 3}O{sub 4} nanosheets were obtained while their precursor was synthesized at 140 {sup o}C for 3 h and calcined at 500 {sup o}C in air for 2 h. The sensitivity test of Co{sub 3}O{sub 4} to alcohol reveals that the hollow Co{sub 3}O{sub 4} nanorings show the best sensitivity, porous Co{sub 3}O{sub 4} like-nanochains are superior to that of the porous nanosheets.« less

Authors:
; ; ;  [1];  [1]
  1. School of Materials Science and Engineering, University of Jinan, Jinan Shandong 250022 (China)
Publication Date:
OSTI Identifier:
22212187
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 46; Journal Issue: 7; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALCOHOLS; CARBON MONOXIDE; COBALT OXIDES; CRYSTALS; FIELD EMISSION; HYDROTHERMAL SYNTHESIS; NANOSTRUCTURES; POROUS MATERIALS; PRECURSOR; RAW MATERIALS; SCANNING ELECTRON MICROSCOPY; SENSITIVITY; SURFACE PROPERTIES; X-RAY DIFFRACTION

Citation Formats

Man, Liying, Niu, Ben, Xu, Hongyan, Cao, Bingqiang, and Wang, Jieqiang, E-mail: mse_wangjq@ujn.edu.cn. Microwave hydrothermal synthesis of nanoporous cobalt oxides and their gas sensing properties. United States: N. p., 2011. Web. doi:10.1016/J.MATERRESBULL.2011.02.045.
Man, Liying, Niu, Ben, Xu, Hongyan, Cao, Bingqiang, & Wang, Jieqiang, E-mail: mse_wangjq@ujn.edu.cn. Microwave hydrothermal synthesis of nanoporous cobalt oxides and their gas sensing properties. United States. doi:10.1016/J.MATERRESBULL.2011.02.045.
Man, Liying, Niu, Ben, Xu, Hongyan, Cao, Bingqiang, and Wang, Jieqiang, E-mail: mse_wangjq@ujn.edu.cn. Fri . "Microwave hydrothermal synthesis of nanoporous cobalt oxides and their gas sensing properties". United States. doi:10.1016/J.MATERRESBULL.2011.02.045.
@article{osti_22212187,
title = {Microwave hydrothermal synthesis of nanoporous cobalt oxides and their gas sensing properties},
author = {Man, Liying and Niu, Ben and Xu, Hongyan and Cao, Bingqiang and Wang, Jieqiang, E-mail: mse_wangjq@ujn.edu.cn},
abstractNote = {Graphical abstract: Photographs taken at the field emission scanning electron microscope of (a) nanosheet-like Co{sub 3}O{sub 4}, (b) nanochain-like Co{sub 3}O{sub 4} and (c) nanoring-like Co{sub 3}O{sub 4}. Highlights: {yields} CO{sub 3}{sup 2-} acts as an inhibitor that affects the growth rates of precursors in different crystal directions. {yields} Nanosheet-like Co{sub 3}O{sub 4}, nanochain-like Co{sub 3}O{sub 4}, and nanoring-like Co{sub 3}O{sub 4} were obtained by microwave hydrothermal process under different precipitants and synthetic conditions. {yields} Specific surface area of nano Co{sub 3}O{sub 4} with various morphologies plays an important role in gas sensitivity to alcohol. -- Abstract: In this paper, the precursors were synthesized by microwave hydrothermal method using Co(NO{sub 3}){sub 2}.6H{sub 2}O as raw material, CO(NH{sub 2}){sub 2} and KOH as precipitants, respectively. The precursors and calcined products were characterized by XRD, FESEM, and BET-BJH. The results show that both constituent and synthetic condition can determine the products morphology. When using KOH as precipitant, hollow Co{sub 3}O{sub 4} nanorings were obtained whose precursor was synthesized at 140 {sup o}C for 3 h and calcined at 500 {sup o}C in air for 2 h. While using CO(NH){sub 2}, Co{sub 3}O{sub 4} like-nanochains were obtained whose precursor was synthesized at 110 {sup o}C for 1 h and calcined at 420 {sup o}C in air for 2 h, and Co{sub 3}O{sub 4} nanosheets were obtained while their precursor was synthesized at 140 {sup o}C for 3 h and calcined at 500 {sup o}C in air for 2 h. The sensitivity test of Co{sub 3}O{sub 4} to alcohol reveals that the hollow Co{sub 3}O{sub 4} nanorings show the best sensitivity, porous Co{sub 3}O{sub 4} like-nanochains are superior to that of the porous nanosheets.},
doi = {10.1016/J.MATERRESBULL.2011.02.045},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 7,
volume = 46,
place = {United States},
year = {2011},
month = {7}
}