Simultaneous electrochemical detection of ascorbic acid and dopamine on Cu2O/CuO/electrochemically reduced graphene oxide (CuxO/ERGO)-nanocomposite-modified electrode

• Published in: Microchemical journal 2019-11, Vol.150, p.104157, Article 104157
• Main Authors: Öztürk Doğan, Hülya, Kurt Urhan, Bingül, Çepni, Emir, Eryiğit, Mesut
• Format: Article
• Language: English
• Subjects: Biosensor; Copper oxide; Dopamine; Electrochemically reduced graphene oxide
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2019.104157

This study proposes a new approach for the electrochemical growth of Cu2O/CuO/electrochemically reduced graphene oxide (CuxO/ERGO) nanostructures based on simultaneous co-reduction of both copper ions, i.e. Cu (I) and Cu (II), and graphene oxide from an aqueous suspension on gold electrode. X-ray diffraction (XRD) spectra of the as-prepared CuxO/ERGO electrode show that CuO, Cu2O and graphene structures are composite nanostructures. Scanning electron microscopy (SEM) images show that CuxO/ERGO forms in different shapes (nanoflowers and nanocubes). Experimental results show that structures of CuxO/ERGO nanocomposite films can be easily controlled by application potential and experimental media. The resulting CuxO/ERGO nanocomposite electrodes exhibit good electrocatalytic activity towards dopamine sensing in the presence of ascorbic acid and could be used for biosensor applications [with low working potential (at approximately +0.2 V), high sensitivity (122.4 μA cm−2 mM−1) and low detection limit (12 × 10−9 mol·L−1)]. [Display omitted] •CuxO/ERGO composites were fabricated by a one-step electrochemical co-deposition technique on Au electrode surface.•The hybrid nanocomposite for dopamine biosensor was studied.•The as-prepared nanocomposite exhibited good electrocatalytic activity for DA sensing in the presence of AA.