Electrochemical performance of TiO ₂ /Au/carbon nanotubes composite interface for hydroquinone detection

Abstract

A novel nanocomposite was prepared by direct mixing of titania nanoparticles (nano-TiO 2) and gold nanoparticles (nano-Au)-modified carbon nanotubes (CNTs) in a solution of chitosan. The electrochemical performance of a TiO 2 /Au/CNT nanocomposite-modified electrode for hydroquinone detection was investigated. When measured at a scan rate of 50 mV s − 1 , the detected amount of hydroquinone at the TiO 2 / Au/CNT electrode varied linearly with hydroquinone concentration, for concentrations from 1 × 10 − 6 to 1 × 10 − 8 M; the sensitivity was 997 617 μA(mol l − 1) − 1 , and the detection limit was 1 × 10 − 10 M (S/N = 3). In all experiments, TiO 2 /Au/CNT nanocomposites exhibited better electrochemical performance than TiO 2 /CNT composites or CNTs. Enhanced current response can be attributed to the synergic effect of nano-TiO 2 , nano-Au and CNTs.

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Three-Component EC-SPR Biosensor Based on Graphene Oxide, SiO2and Gold Nanoparticles in NADH Determination

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Simultaneous Determination of Small Biomolecules and Nitrite Using an Au/TiO2/Carbon Nanotube Composite-Modified Electrode

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