Nitrogen-Doped Carbon Fiber Ultramicroelectrodes as Electrochemical Sensors for Detection of Hydrogen Peroxide

Author

Eric Wornyo, East Tennessee State UniversityFollow

Degree Name

MS (Master of Science)

Program

Chemistry

Date of Award

8-2021

Committee Chair or Co-Chairs

Gregory W. Bishop

Committee Members

Dane W. Scott, Marina Roginskaya

Abstract

Carbon fiber ultramicroelectrodes (CF-UMEs) are commonly used as electrochemical probes and sensors due to their small size, fast response, and high signal-to-noise ratio. Surface modification strategies are often employed on CF-UMEs to improve their selectivity and sensitivity for desired applications. However, many modification methods are cumbersome and require expensive equipment. In this study, a simple approach known as soft nitriding is used to prepare nitrogen-doped CF-UMEs (N-CF-UMEs). Nitrogen groups introduced via soft nitriding act as electrocatalytic sites for the breakage of O-O bonds during the reduction of peroxides like H₂O₂, a common target of biosensing strategies. Voltammetric studies confirm that, compared to CF-UMEs, N-CF-UMEs possess enhanced electrocatalytic activity towards H₂O₂ reduction as evidenced by an increase in current and positive shift in onset potential for the reaction. N-CF-UMEs also proved capable for amperometric detection of H₂O₂, exhibiting good linear response from 0.1 to 5.6 mM at -0.4 V vs. Ag/AgCl.

Document Type

Thesis - embargo

Recommended Citation

Wornyo, Eric, "Nitrogen-Doped Carbon Fiber Ultramicroelectrodes as Electrochemical Sensors for Detection of Hydrogen Peroxide" (2021). Electronic Theses and Dissertations. Paper 3960. https://dc.etsu.edu/etd/3960

Copyright

Copyright by the authors.