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      Phonon energy transfer in graphene–photoacid hybrids

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      Author
      Pan, Xiaoyong
      Li, Hao
      Nguyen, Kim Truc
      Grüner, George
      Zhao, Yanli
      Date of Issue
      2012
      School
      School of Materials Science and Engineering
      School of Physical and Mathematical Sciences
      Abstract
      Three water-soluble pyrene derivatives, i.e., 1-pyrenesulfonic acid sodium salt (PAS), 8-hydroxy-1,3,6-pyrenetrisulfonic acid trisodium salt (HPTS), and 6,8-dihydroxy-1,3-pyrenedisulfonic acid disodium salt (DHPDS), were employed in noncovalent functionalization of graphene. The phonon coupling interaction between the HPTS and DHPDS photoacids and graphene was demonstrated by UV–vis and photoluminescence spectroscopies, and the proposed mechanism of the phonon transfer was verified by temperature-dependent absorption spectroscopy. Graphene plays the role as a modulator in these graphene/photoacid hybrid systems, which switches the equilibrium between different species of the photoacids. Current work presents the pioneering investigation of phonon coupling (phonon energy transfer) in the graphene–photoacid systems.
      Subject
      DRNTU::Science::Chemistry::Physical chemistry
      Type
      Journal Article
      Series/Journal Title
      The journal of physical chemistry C
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      • MSE Journal Articles
      http://dx.doi.org/10.1021/jp2109016
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