Details

Autor(en) / Beteiligte

• Liu, Bingdi
• Ouyang, Xiaoqian
• Ding, Yaping
• Luo, Liqing
• Xu, Duo
• Ning, Yanqun

Titel

Electrochemical preparation of nickel and copper oxides-decorated graphene composite for simultaneous determination of dopamine, acetaminophen and tryptophan

Ist Teil von

• Talanta (Oxford), 2016-01, Vol.146, p.114-121

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2016

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• In the present work, transition metal oxides decorated graphene (GR) have been fabricated for simultaneous determination of dopamine (DA), acetaminophen (AC) and tryptophan (Trp) using square wave voltammetry. Electro-deposition is a facile preparation strategy for the synthesis of nickel oxide (NiO) and copper oxide (CuO) nanoparticles. GR can be modified by using citric acid to produce more functional groups, which is conducive to the deposition of dispersed metal particles. The morphologies and interface properties of the obtained NiO–CuO/GR nanocomposite were examined by scanning electron microscopy, energy dispersive X-ray spectroscopy and Raman spectroscopy. Moreover, the electrochemical performances of the composite film were investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The modified electrode exhibited that the linear response ranges for detecting DA, AC and Trp were 0.5–20μM, 4–400μM and 0.3–40μM, respectively, and the detection limits were 0.17μM, 1.33μM and 0.1μM (S/N=3). Under optimal conditions, the sensor displayed high sensitivity, excellent stability and satisfactory results in real samples analysis. An electrochemical sensor based on transition metal oxides nanoparticles–graphene composite film (NiO–CuO/GR) modified glassy carbon electrode for simultaneously detecting dopamine (DA), acetaminophen (AC) and tryptophan (Trp) was fabricated by using square wave voltammetry. [Display omitted] •NiO–CuO/graphene modified electrode was prepared by electro-deposition.•Graphene was modified by using citric acid to produce more functional groups, which benefits the deposition of dispersed metal particles.•The proposed sensor shows wide linear concentration range and high sensitivity for coinstantaneous determination of dopamine, acetaminophen and tryptophan.