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Freestanding 3D mesoporous Co₃O₄@carbon foam nanostructures for ethanol gas sensing.

Metal oxide materials have been widely used as gas-sensing platforms, and their sensing performances are largely dependent on the morphology and surface structure. Here, freestanding flower-like Co3O4 nanostructures supported on three-dimensional (3D) carbon foam (Co3O4@CF) were successfully synthes... Full description

Journal Title: Analytical chemistry August 5, 2014, Vol.86(15), pp.7996-8002
Main Author: Li, Lei
Other Authors: Liu, Minmin , He, Shuijian , Chen, Wei
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1520-6882 ; DOI: 1520-6882 ; DOI: 10.1021/ac5021613
Link: http://search.proquest.com/docview/1551612357/?pq-origsite=primo
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title: Freestanding 3D mesoporous Co₃O₄@carbon foam nanostructures for ethanol gas sensing.
format: Article
creator:
  • Li, Lei
  • Liu, Minmin
  • He, Shuijian
  • Chen, Wei
subjects:
  • Carbon–Chemistry
  • Cobalt–Chemistry
  • Ethanol–Analysis
  • Gases–Chemistry
  • Microscopy, Electron, Scanning–Chemistry
  • Nanostructures–Chemistry
  • Oxides–Chemistry
  • Porosity–Chemistry
  • Gases
  • Oxides
  • Cobalt
  • Ethanol
  • Carbon
  • Cobalt Oxide
ispartof: Analytical chemistry, August 5, 2014, Vol.86(15), pp.7996-8002
description: Metal oxide materials have been widely used as gas-sensing platforms, and their sensing performances are largely dependent on the morphology and surface structure. Here, freestanding flower-like Co3O4 nanostructures supported on three-dimensional (3D) carbon foam (Co3O4@CF) were successfully synthesized by a facile and low-cost hydrothermal route and annealing procedure. The morphology and structure of the nanocomposites were studied by X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive spectroscopy, and scanning electron microscopy (SEM). The SEM characterizations showed that the skeleton of the porous carbon foam was fully covered by flower-like Co3O4 nanostructures. Moreover, each Co3O4 nanoflower is composed of densely packed nanoneedles with a length of ~10 μm, which can largely enhance the surface area (about 286.117 m(2)/g) for ethanol sensing. Gas sensor based on the as-synthesized 3D Co3O4@CF nanostructures was fabricated to study the sensing performance for ethanol at a temperature range from 180 to 360 °C. Due to the 3D porous structure and the improvement in sensing surface/interface, the Co3O4@CF nanostructure exhibited enhanced sensing performance for ethanol detection with low resistance, fast response and recovery time, high sensitivity, and limit of detection as low as 15 ppm at 320 °C. The present study shows that such novel 3D metal oxide/carbon hybrid nanostructures are promising platforms for gas sensing.
language: eng
source:
identifier: E-ISSN: 1520-6882 ; DOI: 1520-6882 ; DOI: 10.1021/ac5021613
fulltext: no_fulltext
issn:
  • 15206882
  • 1520-6882
url: Link


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titleFreestanding 3D mesoporous Co₃O₄@carbon foam nanostructures for ethanol gas sensing.
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subjectCarbon–Chemistry ; Cobalt–Chemistry ; Ethanol–Analysis ; Gases–Chemistry ; Microscopy, Electron, Scanning–Chemistry ; Nanostructures–Chemistry ; Oxides–Chemistry ; Porosity–Chemistry ; Gases ; Oxides ; Cobalt ; Ethanol ; Carbon ; Cobalt Oxide
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descriptionMetal oxide materials have been widely used as gas-sensing platforms, and their sensing performances are largely dependent on the morphology and surface structure. Here, freestanding flower-like Co3O4 nanostructures supported on three-dimensional (3D) carbon foam (Co3O4@CF) were successfully synthesized by a facile and low-cost hydrothermal route and annealing procedure. The morphology and structure of the nanocomposites were studied by X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive spectroscopy, and scanning electron microscopy (SEM). The SEM characterizations showed that the skeleton of the porous carbon foam was fully covered by flower-like Co3O4 nanostructures. Moreover, each Co3O4 nanoflower is composed of densely packed nanoneedles with a length of ~10 μm, which can largely enhance the surface area (about 286.117 m(2)/g) for ethanol sensing. Gas sensor based on the as-synthesized 3D Co3O4@CF nanostructures was fabricated to study the sensing performance for ethanol at a temperature range from 180 to 360 °C. Due to the 3D porous structure and the improvement in sensing surface/interface, the Co3O4@CF nanostructure exhibited enhanced sensing performance for ethanol detection with low resistance, fast response and recovery time, high sensitivity, and limit of detection as low as 15 ppm at 320 °C. The present study shows that such novel 3D metal oxide/carbon hybrid nanostructures are promising platforms for gas sensing.
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