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Effect of Tungsten Oxide Nanostructures on Sensitivity and Selectivity of Pollution Gases

by 1,2,*,†, 3,† and 2,*,†
1
School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005, China
2
Department of Physics, University of Puerto Rico, San Juan, PR 00936, USA
3
Department of Physics, Indiana University of Pennsylvania, Indiana, PA 15705, USA
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2020, 20(17), 4801; https://doi.org/10.3390/s20174801
Received: 18 July 2020 / Revised: 14 August 2020 / Accepted: 17 August 2020 / Published: 26 August 2020
(This article belongs to the Special Issue Advanced Micro and Nano Technologies for Gas Sensing)
We report on the different surface structures of tungsten oxides which have been synthesized using a simple post-annealing-free hot-filament CVD technique, including 0D nanoparticles (NPs), 1D nanorods (NRs), and 2D nanosheet assemblies of 3D hierarchical nanoflowers (NFs). The surface morphologies, crystalline structures, and material compositions have been characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Raman spectroscopy, respectively. The sensor performances based on the synthesized samples of various surface morphologies have been investigated, as well as the influences of operating temperature and applied bias. The sensing property depends closely on the surface morphology, and the 3D hierarchical nanoflowers-based gas sensor offers the best sensitivity and fastest response time to NH3 and CH3 gases when operated at room temperature. View Full-Text
Keywords: tungsten trioxide; surface morphology; gas sensor; hot-filament CVD tungsten trioxide; surface morphology; gas sensor; hot-filament CVD
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MDPI and ACS Style

An, F.; Zhou, A.F.; Feng, P.X. Effect of Tungsten Oxide Nanostructures on Sensitivity and Selectivity of Pollution Gases. Sensors 2020, 20, 4801. https://doi.org/10.3390/s20174801

AMA Style

An F, Zhou AF, Feng PX. Effect of Tungsten Oxide Nanostructures on Sensitivity and Selectivity of Pollution Gases. Sensors. 2020; 20(17):4801. https://doi.org/10.3390/s20174801

Chicago/Turabian Style

An, Fenghui; Zhou, Andrew F.; Feng, Peter X. 2020. "Effect of Tungsten Oxide Nanostructures on Sensitivity and Selectivity of Pollution Gases" Sensors 20, no. 17: 4801. https://doi.org/10.3390/s20174801

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