Nuclear chemistry

Catalysis

Platinum nanoparticles

Engineering

Nafion

Electrochemistry

Materials science

Cyclic voltammetry

Nanocomposite

Biochemistry

Chemical engineering

Biosensor

Physical chemistry

Glucose oxidase

Nanotechnology

Organic chemistry

Carbon nanotube

X-ray photoelectron spectroscopy

Amperometry

Chemistry

Electrode

Nanostructure

Platinum

Talanta

Platinum nanoparticles (Pt NPs) were deposited onto multi-walled carbon nanotubes (MWNTs) through direct chemical reduction without any other stabilizing agents. Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry were employed to characterize the morphology of the as-prepared nanocomposite (noted as Pt NPs–MWNTs) and further identify the Pt NPs on the surface of MWNTs. The nanocomposite demonstrated the ability to electrocatalyze the oxidation of hydrogen peroxide and substantially raises the response current. A sensitivity of 591.33 μA mM−1 cm−2 was obtained at Pt NPs–MWNTs modified electrode. Thus, we immobilized glucose oxidase (GOD) as a model enzyme on the nanocomposite-based electrode with a thin layer of Nafion to fabricate a glucose biosensor, which showed sensitive and fast response to glucose. The influence of the GOD loading was investigated and the biosensor with an enzyme loading concentration of 10 mg/mL shows optimal performance for glucose detection, that is, a detection limit of 3 μM and a response time of 3 s, respectively.

Nanocomposite based on depositing platinum nanostructure onto carbon nanotubes through a one-pot, facile synthesis method for amperometric sensing