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Ammonia-Gas-Sensing Characteristics of WO3/Carbon Nanotubes Nanocomposites: Effect of Nanotube Content and Sensing Mechanism

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Gas sensors based on the nanocomposite of nanostructured tungsten oxide (WO3) and carbon nanotubes (CNTs) were fabricated for ammonia (NH3) detection. The nanostructured WO3 material was fabricated using a hydrothermal method, whereas the nanocomposites were prepared by mixing WO3 powders with CNTs. Morphology and quality of the synthesized materials were characterized by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy analyses. Effects of CNT content on the NH3 sensing characteristics of nanocomposites were systematically investigated. Results demonstrated that the fabricated gas sensors enabled NH3 monitoring with fast response and recovery times of few seconds, which are suitable for actual application in environmental monitoring. A gas-sensing mechanism of the WO3/CNT composites was proposed based on the formation of a Schottky heterojunction between CNT and WO3.
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Document Type: Research Article

Publication date: March 1, 2016

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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