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  • 09월 10일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Enhanced gas sensing properties of nitrogen doped mesoporous graphene at room temperature

2019년 8월 29일 16시 49분 38초
MAT.P-388 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Material Chemistry
저자 및
Rosalynn Nankya, David Odhiambo Opar1, Hyun Jung*
Department of Chemistry, Dongguk University, Korea
1Chemistry, Dongguk University, Korea
Nitrogen doped mesoporous graphene (NMG) has been synthesized via a hydrothermal method using soft-template, tri-block co-polymer P123 and ammonia as the nitrogen source. During this process, nitrogen doping is achieved simultaneously with reduction of graphene oxide. The obtained NMG has a unique meso-structure, high surface area (1138 m2 g-1) and a high nitrogen concentration (7.9 at %). These structural features enable the NMG gas sensor to exhibit a high response and better selectivity for NO2 due to the more active sites on the NMG surface which leads to high interactions between gas molecules and the graphene matrix, and a limit of detection of 0.07 ppm. However the electron-donating gases (NH3, H2), demonstrated repulsion between the lone pair of electrons on the NMG surface and the electrons donated from these gases leading to a weak response. The sensing mechanism towards these gases is attributed to the charge transfer between the gas molecules and the NMG sensing material, which shifts the Fermi-level up or down, resulting in an increase and decrease on the electrical resistance respectively. Therefore, electrophilic gases have a strong interaction with the NMG surface compared to the electrophobic gases. Thus, the excellent sensing performance of NMG is attributed to incorporation of N atoms into graphene matrix hence providing a promising platform for electrophilic gas sensing.