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Nano Research

Article Title

Charge transfer in graphene/polymer interfaces for CO2 detection

Authors

Kihyeun Kim, 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
Myungwoo Son, 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
Yusin Pak, 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
Sang-Soo Chee, 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
Francis Malar Auxilia, 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
Byung-Kee Lee, Materials & Devices Advanced Research Institute, LG Electronics, Woomyeon R&D Campus, 38 Baumoe-ro, Seocho-gu, Seoul 06763, Republic of Korea
Sungeun Lee, Materials & Devices Advanced Research Institute, LG Electronics, Woomyeon R&D Campus, 38 Baumoe-ro, Seocho-gu, Seoul 06763, Republic of Korea
Sun Kil Kang, Materials & Devices Advanced Research Institute, LG Electronics, Woomyeon R&D Campus, 38 Baumoe-ro, Seocho-gu, Seoul 06763, Republic of Korea
Chaedeok Lee, Materials & Devices Advanced Research Institute, LG Electronics, Woomyeon R&D Campus, 38 Baumoe-ro, Seocho-gu, Seoul 06763, Republic of Korea
Jeong Soo Lee, Materials & Devices Advanced Research Institute, LG Electronics, Woomyeon R&D Campus, 38 Baumoe-ro, Seocho-gu, Seoul 06763, Republic of Korea
Ki Kang Kim, Department of Energy and Materials Engineering, Dongguk University, Seoul 04620, Republic of Korea
Yun Hee Jang, Energy Systems Engineering, Daegu Gyeongbuk Institute of Science & Technology, 333, Techno jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu 42988, Republic of Korea
Byoung Hun Lee, 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
Gun-Young Jung, 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
Moon-Ho Ham, 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

Keywords

graphene, polyethyleneimine (PEI), polyethylene glycol, carbon dioxide, charge transfer

Abstract

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.

Graphical Abstract

Publisher

Tsinghua University Press

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