Professor
Supervisor of Doctorate Candidates
Supervisor of Master's Candidates
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Affiliation of Author(s):电气与电子工程学院
Teaching and Research Group:测控技术与仪器系
Journal:Analytical chemistry
Funded by:省、市、自治区科技项目
Abstract:Metal oxide materials have been widely used as gassensing 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 m2/g) for ethanol sensing. Gas sensor based on the assynthesized 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.
First Author:lilei
Indexed by:Journal paper
Volume:86
Issue:15
Page Number:1
ISSN No.:1520-6882
Translation or Not:no
Date of Publication:2014-08-22
