Phonon Energy Transfer
in Graphene–Photoacid
Hybrids
- Publication date
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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