Oxygen functionalised epitaxial graphene sensors for enhanced polar organic chemical vapour detection

Author

Nagareddy, Venkata Karthik ; Goss, J.P. ; Wright, N.G. ; Horsfall, A.B. ; Hernandez, S.C. ; Wheeler, V.D. ; Nyakiti, Luke O. ; Myers-Ward, Rachael L. ; Eddy, Charles R. ; Walton, S.G. ; Gaskill, D. Kurt

Author_Institution

Sch. of Electr. & Electron. Eng., Newcastle Univ., Newcastle upon Tyne, UK

fYear

2012

fDate

28-31 Oct. 2012

Firstpage

1

Lastpage

4

Abstract

Oxygen functionalised epitaxial graphene (OFEG) chemiresistor sensors were fabricated for sensing polar organic analyte vapours in the ambient atmosphere. The electrical characteristics of the sensor showed an increase in resistance to polar protic analytes, whilst the resistance decreased upon exposure to polar aprotic vapours. The OFEG sensors showed a significant increase in response time and an order of magnitude improvement in the recovery time in comparison to non-functionalised epitaxial graphene (NFEG) sensors. A strong correlation between the dipole moment of an analyte and the magnitude of the response was observed, where OFEG sensors showed a large linear increase in the magnitude of response in comparison to a small nonlinear change in resistance for NFEG sensors.

Keywords

chemical vapour deposition; gas sensors; graphene; NFEG sensors; OFEG chemiresistor sensors; enhanced polar organic chemical vapour detection; nonfunctionalised epitaxial graphene sensors; oxygen functionalised epitaxial graphene chemiresistor sensors; oxygen functionalised epitaxial graphene sensors; polar protic analytes; sensor electrical characteristics; Chemical sensors; Chemicals; Films; Graphene; Resistance; Sensor phenomena and characterization;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors, 2012 IEEE

Conference_Location

Taipei

ISSN

1930-0395

Print_ISBN

978-1-4577-1766-6

Electronic_ISBN

1930-0395

Type

conf

DOI

10.1109/ICSENS.2012.6411289

Filename

6411289