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제113회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Strongly-Coupled 2D Nanohybrids of Titanate?Graphene with Novel Functions as Photocatalysts and Antibacterial Matrices

2014년 2월 13일 16시 43분 37초
MAT.O-9 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 12시 : 40분
재료화학 - Current Trends in Materials Chemistry
저자 및
김인영, 이장미1, 황성주*
이화여자대학교 화학·나노과학과, Korea
1이화여자대학교 화학나노과학부, Korea
Strongly-coupled two-dimensional (2D) nanohybrids of titanate-reduced graphene oxide (rG-O) nanosheets are synthesized in the form of powdery composite and freestanding film. A reassembling reaction between TiO2 nanoparticles and rG-O nanosheets yields the powdery nanohybrid of layered titanate-rG-O through a phase transformation of anatase TiO2 to layered titanate. The hybridization with rG-O nanosheets is effective not only in promoting the phase transition of anatase TiO2 to layered titanate but also in improving the thermal stability of layered titanate, indicating the role of rG-O nanosheet as an agent for directing and stabilizing layered structure. Of prime interest is that the hybridization with rG-O nanosheets suppresses an absorption edge of semiconducting titanate component, strongly suggesting a modification of the electronic structure of titanate component upon the hybridization with rG-O. A strong electronic coupling between two components is evidenced by the visible light-induced generation of photocurrents after the hybridization with rG-O. Another form of titanate-rG-O freestanding film can be fabricated by a vacuum-assisted filtration of the mixed colloidal suspension of titanate and rG-O nanosheets. The stability of the freestanding film for the microwave and ultrasonic stresses becomes remarkably enhanced upon the incorporation of layered titanate nanosheets, a result of strong coupling between interstratified rG-O and layered titanate nanosheets. Also, the incorporation of layered titanate nanosheets into the rG-O paper remarkably enhances the antibacterial properties and hydrophilicity of the graphene paper, which is attributable to the increase of surface roughness. The present findings clearly demonstrate that the hybridization of 2D titanate and rG-O nanosheets is fairly powerful in optimizing the photocatalytic and antibacterial functionalities of metal oxide-based nanohybrids.