Research Article


2018, 11(7): 3529–3536


Charge transfer in graphene/polymer interfaces for CO2 detection

Kihyeun Kim1,§, Myungwoo Son1,§, Yusin Pak1, Sang-Soo Chee1, Francis Malar Auxilia1, Byung-Kee Lee2, Sungeun Lee2, Sun Kil Kang2, Chaedeok Lee2, Jeong Soo Lee2, Ki Kang Kim3, Yun Hee Jang4, Byoung Hun Lee1, Gun-Young Jung1 (*), and Moon-Ho Ham1 (*)

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1 School of Materials Science and Engineering, Research Institute for Solar and Sustainable Energies, Gwangju Institute of Science & Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
2 Materials & Devices Advanced Research Institute, LG Electronics, Woomyeon R&D Campus, 38 Baumoe-ro, Seocho-gu, Seoul 06763, Republic of Korea
3 Department of Energy and Materials Engineering, Dongguk University, Seoul 04620, Republic of Korea
4 Energy Systems Engineering, Daegu Gyeongbuk Institute of Science & Technology, 333, Techno jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu 42988, Republic of Korea
§ Kihyeun Kim and Myungwoo Son contributed equally to this work.

Keywords: graphene, polyethyleneimine (PEI), polyethylene glycol, carbon dioxide, charge transfer
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ABSTRACT Understanding charge transfer processes between graphene and functional materials is crucial from the perspectives of fundamental sciences and potential applications, including electronic devices, photonic devices, and sensors. In this study, we present the charge transfer behavior of graphene and amine-rich polyethyleneimine (PEI) upon CO2 exposure, which was significantly improved after introduction of hygroscopic polyethylene glycol (PEG) in humid air. By blending PEI and PEG, the number of protonated amine groups in PEI was remarkably increased in the presence of water molecules, leading to a strong electron doping effect on graphene. The presence of CO2 gas resulted in a large change in the resistance of PEI/PEG-co-functionalized graphene because of the dramatic reduction of said doping effect, reaching a maximum sensitivity of 32% at 5,000 ppm CO2 and an applied bias of 0.1 V in air with 60% relative humidity at room temperature. This charge transfer correlation will facilitate the development of portable graphene-based sensors for real-time gas detection and the extension of the applications of graphene-based electronic and photonic devices.
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Charge transfer in graphene/polymer interfaces for CO2 detection. Nano Res. 2018, 11(7): 3529–3536

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