Journal
NANO RESEARCH
Volume 11, Issue 7, Pages 3529-3536Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1857-z
Keywords
graphene; polyethyleneimine (PEI); polyethylene glycol; carbon dioxide; charge transfer
Categories
Funding
- Future Semiconductor Device Technology Development Program - Ministry of Trade, Industry Energy (MOTIE) [10044868]
- Korea Semiconductor Research Consortium (KSRC)
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2017M3D1A1040828]
- National Research Foundation of Korea (NRF) through the government of Korea (MSIP) [2016R1A4A1012929]
- Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013M3A6B1078873]
- GIST Research Institute (GRI) - GIST in 2017
- Materials & Devices Advanced Research Institute of LG Electronics Inc. in Seoul, Korea
- Korea Evaluation Institute of Industrial Technology (KEIT) [10044868] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Science, ICT & Future Planning, Republic of Korea [GIST-14] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018R1A2B2002302, 2017M3D1A1040834] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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