Partially Oxidized Graphene/Metallic Single‐Walled Carbon Nanotubes Film‐Coated Electrode for Nanomolar Detection of Dopamine | Zendy

Sundramoorthy Ashok K. | Zendy; Gunasekaran Sundaram | Zendy

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Partially Oxidized Graphene/Metallic Single‐Walled Carbon Nanotubes Film‐Coated Electrode for Nanomolar Detection of Dopamine

Author(s) -

Sundramoorthy Ashok K.,

Gunasekaran Sundaram

Publication year - 2015

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.201500047

Subject(s) - graphene , carbon nanotube , detection limit , nanomaterials , materials science , electrode , biosensor , aqueous solution , metal , glassy carbon , nuclear chemistry , nanotechnology , chemical engineering , inorganic chemistry , electrochemistry , chemistry , cyclic voltammetry , chromatography , organic chemistry , engineering , metallurgy

Enriched metallic single‐walled carbon nanotubes (mSWCNTs) were dispersed in aqueous solution of partially oxidized graphene (po‐Gr). As‐prepared po‐Gr/mSWCNTs suspension was used to modify glassy carbon electrode (GCE) surface, which showed high electrocatalytic activity for dopamine (DA) oxidation in pH 7.0 phosphate buffered saline (PBS) solution. Using po‐Gr/mSWCNTs/GCE we could detect DA from 350 to 3600 nM, with a detection limit down to 25 nM in physiological condition (in pH 7.0 PBS); whereas, po‐Gr/GCE (without mSWCNTs) and bare GCE produced measurable signals only at or above 200 nM DA. Thus, the po‐Gr/mSWCNTs film we fabricated is a promising nanomaterial for fabrication of biosensors for nanomolar detection of DA.

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