Premium
Facile Synthesis of Graphene/Cobalt Oxide Nanohexagons for the Selective Detection of Dopamine
Author(s) -
Velmurugan Murugan,
Devasenathipathy Rajkumar,
Chen ShenMing,
Kohila rani Karuppasamy,
Wang SeaFue
Publication year - 2017
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201600632
Subject(s) - graphene , materials science , detection limit , cobalt , oxide , cobalt oxide , reproducibility , electrochemical gas sensor , analytical chemistry (journal) , transmission electron microscopy , electrochemistry , electrode , nuclear chemistry , nanotechnology , chemistry , chromatography , metallurgy
This work presents a simple green approach for the chemical synthesis of cobalt oxide nano hexagons (Co 3 O 4 NHs) with an average size of 160±40 nm incorporated graphene nanosheets (GR). The techniques used to confirm the formation of GR−Co 3 O 4 NHs are transmission electron microscopy (TEM), energy‐dispersive X‐ray spectroscopy (EDX), and X‐ray diffraction spectroscopy (XRD). The dopamine (DA) sensor was fabricated by drop casting GR−Co 3 O 4 NHs on the pre‐cleaned glassy carbon electrode (GCE). GR−Co 3 O 4 modified GCE displayed a sensitive and selective electrochemical determination of DA compared to only GR and Co 3 O 4 NHs modified GCE. Our fabricated sensor showed a wide linear range from 0.2 to 3443 μM with low limit of detection (84 nM) towards the determination of DA. The sensitivity of our fabricated sensor was calculated to be 108 μA mM −1 cm −2 . As well, a significant storage stability, repeatability and reproducibility were attained by GR−Co 3 O 4 NHs modified GCE. Human urine samples were targeted for the demonstration of practicality of our sensor.