Selective multimodal gas sensing in epitaxial graphene by fourier transform infrared spectroscopy

Author

Shetu, Shamaita S. ; Daas, B. ; Daniels, K.M. ; Sudarshan, Tangali S. ; Koley, Goutam ; Chandrashekhar, M.V.S.

Author_Institution

Dept. of Electr. Eng., Univ. of South Carolina, Columbia, SC, USA

fYear

2013

fDate

3-6 Nov. 2013

Firstpage

1

Lastpage

3

Abstract

We report the sensing behavior of epitaxial graphene (EG) grown on C-face SiC substrates by infrared reflectance spectroscopy through molecular adsorption of NO₂, NH₃ and N₂ gases. Fourier Transform Infrared Reflection (FTIR) measurements were performed on EG under gas exposure and it clearly exhibits an EG thickness dependence. By comparing the change in E_f under gas adsorption with the adsorbed impurity concentration as a function of EG thickness, the 3 gases were clearly distinguished, enabling a new paradigm for multi-modal gas sensing using optical interrogation of EG surfaces towards EG electronic or optical noses.

Keywords

Fourier transform spectroscopy; adsorption; ammonia; epitaxial layers; gas sensors; graphene; infrared spectroscopy; nitrogen; nitrogen compounds; C; C-face SiC substrates; Fourier transform infrared spectroscopy; N₂; N₂ gas; NH₃; NH₃ gas; NO₂; NO₂ gas; SiC; electronic noses; epitaxial graphene; gas adsorption; gas exposure; impurity concentration; infrared reflectance spectroscopy; molecular adsorption; optical noses; selective multimodal gas sensing; Adsorption; Epitaxial growth; Gases; Graphene; Impurities; Sensors; Silicon carbide;

fLanguage

English

Publisher

ieee

Conference_Titel

SENSORS, 2013 IEEE

Conference_Location

Baltimore, MD

ISSN

1930-0395

Type

conf

DOI

10.1109/ICSENS.2013.6688517

Filename

6688517