Transition of gas sensing behavior in non-reduced graphene oxides with thermal annealing

• Published in: Materials letters Vol. 136; pp. 164 - 167
• Main Authors: Park, Hyejin, Ahn, Hosang, Chung, Yoonsung, Baek Cho, Sung, Soo Yoon, Young, Kim, Dong-Joo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2014
• Subjects: Combinatorial analysis; Electrodes; Ethyl alcohol; Gas sensing behavior; Gas sensors; Graphene; Non-reduced graphene oxide; Oxides; Reduced graphene oxide; Sensor arrays; Spin coating; Structure change; Thermal reduction; Reduced graphene oxide; Thermal reduction; Structure change; Gas sensing behavior; Non-reduced graphene oxide
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2014.07.184

Graphene oxide (GO) films were deposited via spin coating on SiO2/Si wafers patterned with interdigitated Pt electrodes. Gas sensing behaviors of GO films and their heat treated films at 200°C in argon atmosphere were characterized. Apparently, non-reduced graphene oxide exhibits n-type and reduced graphene oxide films show p-type behavior on ethanol gas. The change of oxygen functional groups and bond structure are suggested to explain the transition. The combinatorial use of GO and reduced GO (r-GO) in a gas sensor array will provide practical solutions to measure various gases with high selectivity and sensitivity. •Non-reduced graphene oxide films fabricated by a simple spin coating method were demonstrated to measure ethanol gas with high sensitivity.•Transition from n- to p-type gas sensing behavior was observed by heat treatment of non-reduced graphene oxide.•The transition from non-reduced to reduced graphene oxide was confirmed using XPS and FTIR.