Growth of Tin Dioxide Nanostructures on Chemically Synthesized Graphene Nanosheets

화학적으로 합성된 그래핀 나노시트 위에서의 이산화주석 나노구조물의 성장

  • Kim, Jong-IL (Department of Advanced Chemical Engineering, Mokwon University) ;
  • Kim, Ki-Chul (Department of Advanced Chemical Engineering, Mokwon University)
  • 김종일 (목원대학교 신소재화학공학과) ;
  • 김기출 (목원대학교 신소재화학공학과)
  • Received : 2019.02.04
  • Accepted : 2019.05.03
  • Published : 2019.05.31


Metal oxide/graphene composites have been known as promising functional materials for advanced applications such as high sensitivity gas sensor, and high capacitive secondary battery. In this study, tin dioxide ($SnO_2$) nanostructures were grown on chemically synthesized graphene nanosheets using a two-zone horizontal furnace system. The large area graphene nanosheets were synthesized on Cu foil by thermal chemical vapor deposition system with the methane and hydrogen gas. Chemically synthesized graphene nanosheets were transferred on cleaned $SiO_2$(300 nm)/Si substrate using the PMMA. The $SnO_2$ nanostuctures were grown on graphene nanosheets at $424^{\circ}C$ under 3.1 Torr for 3 hours. Raman spectroscopy was used to estimate the quality of as-synthesized graphene nanosheets and to confirm the phase of as-grown $SnO_2$ nanostructures. The surface morphology of as-grown $SnO_2$ nanostructures on graphene nanosheets was characterized by field-emission scanning electron microscopy (FE-SEM). As the results, the synthesized graphene nanosheets are bi-layers graphene nanosheets, and as-grown tin oxide nanostructures exhibit tin dioxide phase. The morphology of $SnO_2$ nanostructures on graphene nanosheets exhibits complex nanostructures, whereas the surface morphology of $SnO_2$ nanostructures on $SiO_2$(300 nm)/Si substrate exhibits simply nano-dots. The complex nanostructures of $SnO_2$ on graphene nanosheets are attributed to functional groups on graphene surface.

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Fig. 1. Schematic diagram of (a) synthesis of graphene nanosheets by thermal CVD system, (b) growth of tin dioxide nanostructures on graphene nanosheets by two-zone thermal CVD system, and (c) procedure of direct growth of SnO2 nanostructures on graphene nanosheets.

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Fig. 4. FE-SEM images of as-grown SnO2 nanostructures on (a) ~ (c) chemically synthesized graphene nanosheets and (d) SiO2(300 nm)/Si substrate. The magnification is (a) 10,000x, (b) & (d) 100,000x and (c) 300,000x, respectively.

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Fig. 2. (a) Raman spectrum, (b) and (c) Raman mapping images of as-synthesized graphene nanosheets before SnO2 growth. (b) Raman mapping image of I2D/IG peak and (c) Raman mapping image of ID peak.

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Fig. 3. (a) Raman spectrum, (b) and (c) Raman mapping image of as-grown SnO2 nanostructures on graphene. (b) Raman mapping image of I2D/IG peak and (c) Raman mapping image of ID peak.


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