• 文献标题:   Exfoliation and Chemical Modification Using Microwave Irradiation Affording Highly Functionalized Graphene
  • 文献类型:   Article
  • 作  者:   ECONOMOPOULOS SP, ROTAS G, MIYATA Y, SHINOHARA H, TAGMATARCHIS N
  • 作者关键词:   graphene, exfoliation, functionalization, microwave, characterization
  • 出版物名称:   ACS NANO
  • ISSN:   1936-0851 EI 1936-086X
  • 通讯作者地址:   Natl Hellen Res
  • 被引频次:   93
  • DOI:   10.1021/nn101735e
  • 出版年:   2010

▎ 摘  要

Effident exfoliation of graphite flakes by sonicating them in benzylamine was accomplished, affording stable suspensions of few-layers graphene. The latter were chemically modified following the Bingel reaction conditions, with the aid of microwave Irradiation, producing highly functionalized graphene-based hybrid materials. The resulting hybrid materials, possessing cyclopropanated malonate units covalently grafted onto the graphene skeleton, formed stable suspensions for several days in a variety of organic solvents and were characterized by diverse and complementary spectroscopic, thermal, gravimetric, and high-resolution electron microscopy techniques. When a malonate derivative, bearing the electro-active extended tetrathiafulvalene (exTTF) moiety, was synthesized and used for the functionalization of graphene, energy dispersive X-ray (EDX) analysis verified the presence of sulfur in the corresponding graphene-based hybrid material. Moreover, the redox potentials of the exTTF-graphene hybrid material were determined by electrochemistry, while the formation of a radical ion pair that includes one-electron oxidation of exTTF and one-electron reduction of graphene was suggested with the energy gap of (graphene)(center dot-)-(exTTF)(center dot+) being calculated as 1.23 eV.