Development of room temperature H2S gas sensors using flower-like ZnO nanorods
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Ghaderahmadi, Sara
issued: 2022-01-06T20:21:00Z
issued: 2021
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
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.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/80552
note: DEVELOPMENT OF ROOM TEMPERATURE H2S GAS SENSORS USING FLOWER-LIKE ZnO NANORODS by Sara Ghaderahmadi B.Sc, in Electrical Engineering, K.N.Toosi University of Technology, Iran, 2020 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Electrical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) December 2021 © Sara Ghaderahmadi, 2021 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, the thesis entitled: DEVELOPMENT OF ROOM TEMPERATURE H2S GAS SENSOR USING FLOWER-LIKE ZnO NANORODS submitted by Sara Ghaderahmadi in partial fulfillment of the requirements for the degree of Master of Applied Science Examining Committee: Dr. Mina Hoorfar, School of Engineering Supervisor Dr. Mohammad Arjmand, School of Engineering Co-supervisor Dr. Jian Liu, School of Engineering Supervisory Committee Member A Dr. Anas Chaaban, School of Engineering Supervisory Committee Member Dr. Sumi Siddiqua, School of Engineering University Examiner iii 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 met…
has type: Thesis/Dissertation
date issued: 2022-02
is shown at: 10.14288/1.0406171
language: eng
degree discipline: Electrical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Hoorfar, Mina
contributor: Arjmand, Mohammad
type: Text
identifier URI: http://hdl.handle.net/2429/80552