Wen Qian

Publications (3)17.66 Total impact

• Source

  Available from: Rui Hao

  Article: Solvothermal-assisted exfoliation process to produce graphene with high yield and high quality

  Wen Qian, Rui Hao, Yanglong Hou, Yuan Tian, Chengmin Shen, Hongjun Gao, Xuelei Liang
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  ABSTRACT: Monolayer and bilayer graphene sheets have been produced by a solvothermal-assisted exfoliation process in a highly polar organic solvent, acetonitrile, using expanded graphite (EG) as the starting material. It is proposed that the dipole-induced dipole interactions between graphene and acetonitrile facilitate the exfoliation and dispersion of graphene. The facile and effective solvothermal-assisted exfoliation process raises the low yield of graphene reported in previous syntheses to 10 wt%–12 wt%. By means of centrifugation at 2000 rpm for 90 min, monolayer and bilayer graphene were separated effectively without the need to add a stabilizer or modifier. Electron diffraction and Raman spectroscopy indicate that the resulting graphene sheets are high quality products without any significant structural defects.
  Nano Research 04/2012; 2(9):706-712. · 6.97 Impact Factor
• Article: Facile preparation of nitrogen-doped few-layer graphene via supercritical reaction.

  Wen Qian, Xu Cui, Rui Hao, Yanglong Hou, Zhiyong Zhang
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  ABSTRACT: To achieve the applications of graphene, the modulation of its electrical properties is of great significance. The element doping might give a promising approach to produce fascinating properties of graphene. Herein we report a facile chemical doping method to obtain nitrogen-doped (N-doped) few-layer graphene sheets through supercritical (SC) reaction in acetonitrile at temperature as low as 310 °C, using expanded graphite as starting material. X-ray photoelectron spectroscopy analysis revealed that the level of nitrogen-doping (N-doping) increased from 1.57 to 4.56 at % when the reaction time was tuned from 2 to 24 h. Raman spectrum confirmed that the resulting N-doped few-layer graphene by SC reaction maintain high quality without any significant structural defects. Electrical measurements indicated that N-doped few-layer graphene sheets exhibit a typical n-type field-dependent behavior, suggesting the N-doping into the lattice of graphene. This work provides a convenient chemical route to the scalable production of N-doped graphene for potential applications in nanoelectronic devices.
  ACS Applied Materials & Interfaces 06/2011; 3(7):2259-64. · 4.53 Impact Factor
• Source

  Available from: Rui Hao

  Article: Aqueous dispersions of TCNQ-anion-stabilized graphene sheets.

  Rui Hao, Wen Qian, Luhui Zhang, Yanglong Hou
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  ABSTRACT: Aqueous dispersed graphene was successfully prepared via using 7,7,8,8-tetracyanoquinodimethane (TCNQ) anion as a stabilizer and expanded graphite as a starting material, which could provide a facile route to produce high quality water-soluble and organic solvent-soluble graphene sheets for various applications.
  Chemical Communications 01/2009; · 6.17 Impact Factor