論文

2019年2月

Facile 1D graphene fiber synthesis from an agricultural by-product: A silicon-mediated graphenization route

Carbon
  • Kazunori Fujisawa
  • ,
  • Yu Lei
  • ,
  • Carla de Tomas
  • ,
  • Irene Suarez-Martinez
  • ,
  • Chanjing Zhou
  • ,
  • Yu Chuan Lin
  • ,
  • Shruti Subramanian
  • ,
  • Ana Laura Elías
  • ,
  • Masatsugu Fujishige
  • ,
  • Kenji Takeuchi
  • ,
  • Joshua A. Robinson
  • ,
  • Nigel Anthony Marks
  • ,
  • Morinobu Endo
  • ,
  • Mauricio Terrones

142
開始ページ
78
終了ページ
88
DOI
10.1016/j.carbon.2018.10.032

© 2018 Elsevier Ltd A one-dimensional (1D) graphene fiber with a novel structure has been prepared by a heat treatment of rice husk, a natural by-product that contains high amounts of silica. A step-by-step heat treatment of rice husk revealed that (i) carbonization yields porous carbon and silica, (ii) 1D β-SiC nanowires are formed by the carbothermic reduction of silica, (iii) finally 1D graphene fibers are created by silicon sublimation from 1D β-SiC nanowires. Raman spectroscopy and electron microscopy studies revealed that the graphene fiber is composed of a turbostratic multilayer structure. The SiC-derived material exhibits a large crystalline size and turbostratic stacking making each layer as quasi-free-standing graphene, which is confirmed by the 3.9 times higher Raman G′-band intensity over the G-band intensity. Molecular dynamics simulations revealed a high diffusion rate of Si atoms and a volume reduction of the SiC structure at the sublimation temperature. Since the silicon sublimation occurred from multiple points of the SiC nanowire, this led to radially-collapsed fibers and faceted structures with thick-graphitic-layer that are inter-connected (deflated-balloons and inter-connected balloon-like fibers). This facile synthesis route opens up a new avenue to the cost-effective and etching-free production of self-standing graphene for its bulk usage.

リンク情報
DOI
https://doi.org/10.1016/j.carbon.2018.10.032
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85055104692&origin=inward

エクスポート
BibTeX RIS