Title :
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
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 Ef 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;
Conference_Titel :
SENSORS, 2013 IEEE
Conference_Location :
Baltimore, MD
DOI :
10.1109/ICSENS.2013.6688517
