Detection of Nitrogen Dioxide via Graphene-Enhanced Raman Scattering

Author

Spencer HazeslipFollow

Date of Graduation

5-2023

Document Type

Thesis

Degree Name

Bachelor of Science in Chemistry

Degree Level

Undergraduate

Department

Chemistry & Biochemistry

Advisor/Mentor

He, Maggie

Committee Member/Reader

Heyes, Colin

Committee Member/Second Reader

Nakamura, Hiro

Committee Member/Third Reader

Wheeler, Jill

Abstract

This paper presents the development of a nitrogen dioxide (NO₂) sensor that utilizes the phenomenon of graphene-enhanced Raman scattering (GERS). The sensor consists of monolayer graphene on a silicon wafer, functionalized noncovalently with Copper(II) 2,9,16,23-tetra-tert-butyl-29H,31H-phthalocyanine (CuTTPc) via the solution soaking method. A custom sensing chamber was constructed to enable Raman spectra to be collected during NO₂ exposure. The response of the sensor was found to be linear between 10 and 100 ppm NO₂, indicating that it could be used for both detection and quantification. Furthermore, the sensor was shown to be reusable after exposure to 10 ppm NO₂. These results demonstrate the potential of GERS-based NO₂ sensors for practical applications in environmental monitoring and safety management.

Keywords

graphene-enhanced Raman scattering, nitrogen dioxide sensor, Copper(II)tetra-tert-butyl-phthalocyanine, copper phthalocyanine, graphene, Raman spectroscopy

Citation

Hazeslip, S. (2023). Detection of Nitrogen Dioxide via Graphene-Enhanced Raman Scattering. Chemistry & Biochemistry Undergraduate Honors Theses Retrieved from https://scholarworks.uark.edu/chbcuht/45