Improved NO^sub 2^ sensing performance of electrospun WO^sub 3^ nanofibers with silver doping

This work reports the enhancement of NO2 gas sensing response which owing to the incorporation of Ag nanoparticles into WO3 nanofiber matrices. Ag-doped WO3 nanofibers were fabricated by electrospinning. The Ag dopant levels ranged from 1 to 10 mol%. The microstructures and chemical compositions wer...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-02, Vol.255, p.1831
Main Authors: Jaroenapibal, Papot, Boonma, Pundaree, Saksilaporn, Nattha, Horprathum, Mati, Amornkitbamrung, Vittaya, Triroj, Napat
Format: Article
Language:English
Subjects:
Ammonia
Catalysis
Chemical composition
Detection
Dopants
Gas sensors
Hydrogen sulfide
Mats
Microstructure
Nanofibers
Nanoparticles
Nitrogen
Nitrogen dioxide
Organic chemistry
Recovery time
Scanning electron microscopy
Sensors
Silver
Studies
Tungsten oxides
X ray photoelectron spectroscopy
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Summary:This work reports the enhancement of NO2 gas sensing response which owing to the incorporation of Ag nanoparticles into WO3 nanofiber matrices. Ag-doped WO3 nanofibers were fabricated by electrospinning. The Ag dopant levels ranged from 1 to 10 mol%. The microstructures and chemical compositions were examined using a series of material characterization methods including TEM, SEM, XRD, and XPS. Porous mats of nanofibers comprising monoclinic WO3 nanoparticles (28–39 nm) incorporated with small Ag particles were observed. The NO2 gas sensing performance was investigated at various gas concentrations (0.5–5 ppm) and operating temperatures (200–275 °C). For 5 ppm NO2 gas detection measured at 225 °C, the 3 mol% Ag-doped WO3 nanofiber gas sensor exhibited the highest gas response (Rg/Ra) of 90.3. This was approximately 9 times higher than that of the undoped sample. The response and recovery time were found to be in the range of 6–18 min. The response analysis obtained from CH4, NH3, SO2, H2S, and NO2 gas measurements suggests that the sensor has excellent selectivity toward NO2 gas. The improved gas response of Ag-doped WO3 nanofibers was attributed to both electronic and chemical sensitization mechanisms provided by Ag nanoparticles. Significant decreases in gas responses were observed in the samples with higher Ag dopant levels (5 and 10 mol%), where the crystallite size of Ag nanoparticles became too large and hindered their catalytic effects.
ISSN:0925-4005
1873-3077