Speaker
Description
The detection and monitoring of H2S gas at high and lower concentrations is very
crucial since this gas is highly toxic and can affect tissues and organs, especially in occupational environment. This work reports on the synthesis of WO3
nanostructures-based sensors for highly sensitive and selective H2S detection
at low operating temperatures. These WO3 nanostructures were synthesized
using pressurized hydrothermal process. Different acids from weak to strong
(HNO3, H2SO4, and HCl) were employed as precipitants to form supposedly
hierarchical and cube-like nanostructures of WO3. These WO3 nanostructures
were characterized by XRD, SEM, TEM, XPS and BET analysis. The fabricated WO3
sensors were exposed to different target gases (CO2, H2, CH4, NH3, LPG and H2S)
at different concentrations. They were found to be selective to H2S, and the WO3
precipitated by HCl otherwise referred to as WO3-HCl was found to be highly
sensitive, with high response of S = 1394.04 towards 150 ppm of H2S at 125°C
operating temperature. The WO3 precipitated by H2SO4 named WO3-H2SO4
showed a high response of 141.64 at 125°C operating temperature. Lastly, WO3
precipitated by HNO3 called WO3-HNO3, recorded a H2S response of 125.75 also
at 125°C operating temperature. The HCl-precipitated WO3 is a promising
candidate for selective detection of H2S, being the most sensitive in the series.
Level for award;(Hons, MSc, PhD, N/A)?
PhD
| Apply to be considered for a student ; award (Yes / No)? | Yes |
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