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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Soft Chemical Route to Single Molecular Layered g-carbon nitride

2018년 8월 30일 17시 38분 09초
MAT.O-14 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 10시 : 31분
Material Chemisty - Oral Presentation of Young Material Chemists
저자 및
Huiyan Piao, Goeun Choi, Jin-ho Choy*
Department of Chemistry and Nano Science, Ewha Womans University, Korea
Graphitic carbon nitride (g-C3N4) has received a great attention not only due to its high chemical and thermal stability, but also its various applications like visible light harvesting photocatalyst, metal-free catalyst and reactive template in nitridation reaction. In addition, its single sheet has attracted great research attention, due to the fact that its single layered molecular structure is very similar to the graphene except tri-angular hole, giving rise to a remarkable enhancement of specific surface area. It is, however, a challenging task to prepare chemically well-defined single sheet of g-C3N4. In the present study, single layered g-C3N4 could be obtained from the bottom-up process based on the polycondensation reaction of cyanamide as a g-C3N4 precursor, in the interlayer space of 2D aluminosilicate as a 2D nanoreactor (Mica). The single layered g-C3N4 can finally be separated from thus prepared g-C3N4-Mica nanohybrid, since the aluminosilicate matrix can be dissolvable under an acidic condition. Each reaction step to single layered g-C3N4 from cyanamide confined in 2D nanoreactor was monitored by X-ray diffraction, FT-IR, UV-Vis, XPS and EELS analyses. According to the AFM analysis, the average topographic height of as-prepared single layered sheet was determined to be around 0.5 nm, which is almost equal to the thickness of a single layer g-C3N4. Finally, the crystal structure of single layered g-C3N4 in an atomic level was further confirmed by low dose Cs-corrected high-resolution transmission electron microscopy (Cs-HRTEM). The single layered sheet exhibited an ordered structure of well-defined hexagonal symmetry with cavity formed by in-plane encirclement of three adjacent heptazine units. It is, therefore, concluded that the present soft chemical route to g-C3N4 single sheet can give rise to atomically well-defined phase consistent made of tri-s-triazine building blocks.