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  • 05월 20일 18시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제125회 대한화학회 학술발표회 및 총회 Two Charge Transfer Routes for Graphene in Acidic Solutions

등록일
2020년 2월 5일 10시 00분 21초
접수번호
0325
발표코드
PHYS.P-227 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
온라인 PDF 제출
발표형식
포스터
발표분야
Physical Chemistry
저자 및
공동저자
Sunmin Ryu*, Kwanghee Park
Department of Chemistry, Pohang University of Science and Technology, Korea
Many two-dimensional materials including graphene and transition metal dichalcogenide undergo charge transfer (CT) and become hole-doped in various acids. Nonetheless, their detailed mechanisms have been controversial. In this work, we propose and verify two distinctive mechanisms driven by O2/H2O redox couples and adsorption of conjugate bases, respectively. Acid-induced changes in the charge density of graphene samples in HCl and H2SO4 solutions were quantified using Raman spectroscopy. At concentrations lower than 1 M, the former mechanism was operative for both acids as the CT reactions required dissolved O2. Above 1 M, however, the degree of CT was even higher for H2SO4 and the dependence of CT on O2 was insignificant, which was attributed to the latter CT mechanism by bisulfate ions adsorbed on graphene. The proposed mechanisms will be discussed using the Marcus-Gerischer theory developed for CT at liquid-solid interfaces.

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