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Development of room temperature H2S gas sensors using flower-like ZnO nanorods Ghaderahmadi, Sara
Abstract
Detection of toxic gases such as hydrogen sulfide (H₂S) at low temperatures is of high importance as it reduces power consumption, increases long-term stability, and lowers the danger of explosion in the presence of flammable gases. Among different gas sensors, chemiresistive metal oxide semi conductor sensors are the most popular type due to their low cost, high sensitivity, compact size, ease of use, and high thermal and mechanical stability. However, these sensors generally require a high operating temperature (>100℃), attributed to their insufficient surface area. Hence, their pristine bulk structures cannot meet the requirements of low-temperature gas sensing. To overcome these limitations, the bulk structure of metal oxide sensors can be modified geometrically for an increased surface area. Herein, we fabricated flower-like ZnO nanorods using a modified hydrothermal method in two different grain sizes of 19 and 23nm. The sample was tested toward H₂S and a range of volatile organic compounds. The sample with smaller grain size provided 7.4 as response value as well as fast response and recovery time of 293 and 186s, respectively, toward 100ppm H₂S at room temperature. The results indicate the potential of the sensing layer for real-time monitoring and detection of hazardous gases detection at room temperature.
Item Metadata
Title |
Development of room temperature H2S gas sensors using flower-like ZnO nanorods
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Creator | |
Supervisor | |
Publisher |
University of British Columbia
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Date Issued |
2021
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Description |
Detection of toxic gases such as hydrogen sulfide (H₂S) at low temperatures is of high importance
as it reduces power consumption, increases long-term stability, and lowers the danger of explosion
in the presence of flammable gases. Among different gas sensors, chemiresistive metal oxide semi conductor sensors are the most popular type due to their low cost, high sensitivity, compact size,
ease of use, and high thermal and mechanical stability. However, these sensors generally require
a high operating temperature (>100℃), attributed to their insufficient surface area. Hence, their
pristine bulk structures cannot meet the requirements of low-temperature gas sensing. To
overcome these limitations, the bulk structure of metal oxide sensors can be modified
geometrically for an increased surface area. Herein, we fabricated flower-like ZnO nanorods using
a modified hydrothermal method in two different grain sizes of 19 and 23nm. The sample was
tested toward H₂S and a range of volatile organic compounds. The sample with smaller grain size
provided 7.4 as response value as well as fast response and recovery time of 293 and 186s,
respectively, toward 100ppm H₂S at room temperature. The results indicate the potential of the
sensing layer for real-time monitoring and detection of hazardous gases detection at room
temperature.
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Genre | |
Type | |
Language |
eng
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Date Available |
2022-01-06
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0406171
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2022-02
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Campus | |
Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Rights
Attribution-NonCommercial-NoDerivatives 4.0 International