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Polycrystalline tungsten oxide nanofibers for gas-sensing applications

Title
Polycrystalline tungsten oxide nanofibers for gas-sensing applications
Author
성기훈
Keywords
Tungsten oxide; Nanofiber; Electrospinning; Gas sensor
Issue Date
2011-12
Publisher
Elsevier Science B.V
Citation
Sensors & Actuators B. Chemical, 2011, 160(1), P.549-554
Abstract
Tungsten oxide nanofibers were successfully prepared via thermal treatment of electrospun composite nanofibers consisting of polyvinylpyrrolidone (PVP) and tungstic acid at 500 degrees C in air. The morphology, crystal structure, and chemical composition of the nanofibers were characterized by SEM, EDX, TEM, XRD, and FT-IR before and after the thermal treatment. It was confirmed that the calcination process was responsible for the removal of PVP component and the growth of crystalline WO(3). The resulting tungsten oxide nanofibers, which had a rough surface morphology and an average diameter of around 40 nm, were found to be formed by the axial agglomeration of prolate spheroid-like WO(3) nanoparticles with monoclinic crystalline phases. Gas-sensing measurements of the polycrystalline WO(3) nanofiber mats were performed upon exposure to ammonia gas. They demonstrated n-type sensing response and sensitive NH(3) detection up to 10 ppm with a well-defined relationship between the concentration and detection response at an operating temperature of 300 degrees C. These results were interpreted by applying the space-charge layer model used in the semiconducting metal-oxide sensor systems.
URI
https://www.sciencedirect.com/science/article/pii/S0925400511007519http://hdl.handle.net/20.500.11754/65862
ISSN
0925-4005
DOI
10.1016/j.snb.2011.08.028
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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