posted 28 Jul 2015, 04:01 by info admin
Halder and Qijin Chi*
Group, Department of Chemistry, Technical University of Denmark, Kongens Lyngby
2800, Denmark. *E-mail: firstname.lastname@example.org
Graphene has emerged as a wonder material in
many fields ranging from physics and chemistry to biology in the past decade. 
Wet-chemical synthesis methods offer low-cost production and facile
functionalization of single-layered and solution suspended biocompatible
graphene.  We here used a biologically active molecule “Dopamine” (DA) for
the biofunctionalization. The unique properties of dopamine (DA) allow to be
used simultaneously as a reducing agent for GO reduction and as a capping
ligand to stabilize and decorate the resulting reduced GO (RGO) surface for
further functionalization. Moreover, as the dopamine moiety contains a redox
couple group, the hybrid material can be highly applicable to electrochemical
sensing. The catechol group of dopamine was selectively protected to prevent
from self-polymerization and undesirable side chain reactions.  After the
coupling reaction with graphene oxide, deprotection reaction was carried out to
recover free catechol groups in the RGO-DA nanocomposite. The HQ/Q- redox
couple in DA moiety can be highly applicable to electrochemical sensing. Here
we used this functionalized material for the electrochemical sensing of
melamine with ultra-high sensitivity.
- D. R. Dreyer, S. Park, C. W. Bielawski and R. S.
Ruoff, Chemical Society Reviews 2010, 39, 228-240.
- N. Zhu, S. Han, S. Gan,
J. Ulstrup and Q. Chi, Advanced
Functional Materials 2013, 23, 5297-5306.
- A. Halder, M. Zhang, G. Olsen and Q. Chi, Manuscript
under preparation, 2015
Halder is currently a PhD student of Nanochemistry group at the Department of
Chemistry, Technical University of Denmark. His research focuses on the biocompatible
engineering functionalization of Graphene nanomaterials and their application
in chemosensors and biosensors.