Development of impedance-transduced chemiresistors for highly selective electrochemical detection in aqueous media
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Yavarinasab, Adel
issued: 2020-09-08T15:09:24Z
issued: 2020
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: In this research, the application of electrochemical impedance spectroscopy (EIS) for electrochemical detection of different components in aqueous media (water, KCl solution, and standard electrolyte solutions) is scrutinized. One of the main advantages of electrochemical sensors compared to other electrical- or optical-based sensing methods is the real-time determination for in situ monitoring of various compounds in a medium. In this regard, 3 chemiresistors with different functional layers (i.e., graphene/poly (methyl methacrylate), polypyrrole, and polyaniline) have been developed in this research. These sensing layers have been exposed to several analytes of interest (e.g., volatile organic compounds, hydrogen sulfide, ammonia, metal ions, etc.). The experiments and measurements were conducted in a broad range of concentrations (part per billion (ppb) to part per thousand (ppt)). In all experiments, the variation in impedance provides several vital characteristics enabling the detection of the analyte of interest with much more selectively as compared to other conventional resistance-based sensors. For this purpose, the faradaic and non-faradaic responses to each analyte at different concentrations are correlated with an equivalent circuit. One of the novelties of this research is the incorporation of the individual equivalent circuit elements as features in 2D and 3D clustered plots to represent the selectivity of the sensors. Another novelty of this work relates to the use of potentiodynamic electrochemical impedance spectroscopy (PDEIS) for a selective in situ recognition of biological trace elements. PDEIS provides a combination of the information that conventional cyclic voltammetry (CV) and EIS represent for analyzing the sensing platform and the electrochemical reactions occurring at the surface of the electrode and electrolyte. Similar to the tests conducted with single analytes, mixtures of different analytes (hydrogen sulfide and ammonia at ppm- and p…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/75903
note: i DEVELOPMENT OF IMPEDANCE-TRANSDUCED CHEMIRESISTORS FOR HIGHLY SELECTIVE ELECTROCHEMICAL DETECTION IN AQUOUES MEDIA By Adel Yavarinasab B.Sc., Iran University of Science and Technology, Iran, 2016 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) August 2020 © Adel Yavarinasab, 2020 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: DEVELOPMENT OF IMPEDANCE-TRANSDUCED CHEMIRESISTORS FOR HIGHLY SELECTIVE AND SENSITIVE ELECTROCHEMICAL DETECTION IN AQUOUES MEDIA Submitted by Adel Yavarinasab in partial fulfillment of the requirements of the degree of Master of Applied Science . Dr. Mina Hoorfar, School of Engineering Supervisor Dr. Homayoun Najjaran, School of Engineering Supervisory Committee Member Dr. Chen Feng, School of Engineering Supervisory Committee Member Dr. Shahria Alam, School of Engineering University Examiner iii Abstract In this research, the application of electrochemical impedance spectroscopy (EIS) for electrochemical detection of different components in aqueous media (water, KCl solution, and standard electrolyte solutions) is scrutinized. One of the main advantages of electrochemical sensors compared to other electrical- or optical-based sensing methods is the real-time determination for in situ monitoring of various compounds in a medium. In this regard, 3 chemiresistors with different functional layers (i.e., graphene/poly (methyl methacrylate), polypyrrole, and polyaniline) have been developed in this research. These sensing layers have been exposed to several analytes of interest (e.g., volatile organic compounds, hydrogen sulfide, ammonia, metal ions, etc.). The experiments and measurements were conducted in a broad range of concentrations (part per billion (ppb) to part per thousa…
has type: Thesis/Dissertation
date issued: 2018-09
is shown at: 10.14288/1.0394256
language: eng
degree discipline: Mechanical 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
type: Text
identifier URI: http://hdl.handle.net/2429/75903