• 文献标题:   Efficient fluorescence quenching in electrochemically exfoliated graphene decorated with gold nanoparticles
  • 文献类型:   Article
  • 作  者:   HURTADOMORALES M, ORTIZ M, ACUNA C, NERL HC, NICOLOSI V, HERNANDEZ Y
  • 作者关键词:   graphene, electrochemical exfoliation, noncovalent functionalization, fluorescence quenching
  • 出版物名称:   NANOTECHNOLOGY
  • ISSN:   0957-4484 EI 1361-6528
  • 通讯作者地址:   Univ Los Andes
  • 被引频次:   4
  • DOI:   10.1088/0957-4484/27/27/275702
  • 出版年:   2016

▎ 摘  要

High surface area graphene sheets were obtained by electrochemical exfoliation of graphite in an acid medium under constant potential conditions. Filtration and centrifugation processes played an important role in order to obtain stable dispersions in water. Scanning electron microscopy and transmission electron microscopy imaging revealed highly exfoliated crystalline samples of similar to 5 mu m. Raman, Fourier transform infrared and x-ray photoelectron spectroscopy further confirmed the high quality of the exfoliated material. The electrochemically exfoliated graphene (EEG) was decorated with gold nanoparticles (AuNPs) using sodium cholate as a buffer layer. This approach allowed for a non-covalent functionalization without altering the desirable electronic properties of the EEG. The AuNP-EEG samples were characterized with various techniques including absorbance and fluorescence spectroscopy. These samples displayed a fluorescence signal using an excitation wavelength of 290 nm. The calculated quantum yield (F) for these samples was 40.04%, a high efficiency compared to previous studies using solution processable graphene.