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Tyramine Functionalized Graphene: Metal‐Free Electrochemical Non‐Enzymatic Biosensing of Hydrogen Peroxide
Author(s) -
Sapner Vijay S.,
Chavan Parag P.,
Digraskar Renuka V.,
Narwade Shankar S.,
Mulik Balaji B.,
Mali Shivsharan M.,
Sathe Bhaskar R.
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801083
Subject(s) - graphene , electrocatalyst , amperometry , biosensor , electrochemistry , surface modification , tyramine , hydrogen peroxide , raman spectroscopy , x ray photoelectron spectroscopy , materials science , scanning electron microscope , inorganic chemistry , chemistry , nuclear chemistry , chemical engineering , nanotechnology , electrode , organic chemistry , biochemistry , physics , engineering , composite material , optics
Abstract We report here non‐enzymatic electrochemical biosensing of H 2 O 2 using a highly stable, metal‐free, tyramine functionalized graphene (T‐GO) based electrocatalytic system. The surface functionalization of tyramine on graphene was carried out chemically. The obtained sheets were characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD) as well as X‐ray photoelectron (XP), Raman, FT‐IR and UV‐visible spectroscopy. More significantly, the combined results from morphological and structural studies show the formation of a few layers of graphene with effective large‐scale functionalization by tyramine. As a metal‐free electrocatalyst, the as‐synthesized T‐GO shown good electrocatalytic activity towards reduction of H 2 O 2 with a sensitivity of 0.105 mM/cm 2 confirmed by combined results from cyclic voltammetric (CV) and linear sweep voltammetric (LSV), and amperometric (i–t) measurements. The lower onset potential (−0.23 mV vs SCE), lower detection limit, wider concentration range (10 mM to 60 mM) with higher electrochemical current and potential stability demonstrated the potential of our non‐enzymatic and cost‐effective T‐GO based electrocatalytic system towards reduction of hydrogen peroxide.