Potentiometric detection of chemical species by spin-assisted assembly of vanadium pentoxide nanorods

Abstract: Vanadium pentoxide nanorods (V2O5-nanorods) and poly(allylamine hydrochloride) (PAH) were assembled onto gold-coated substrates via spin-assisted assembly technique and used as a chemically sensitive electrodes. PAH/V2O5-nanorods detected H+ ions (pH) with sensitivity between 52-61 mV/pH (close to Nernstian theoretical value). As a proof-of-concept, a urea biosensor has been developed, upon immobilization of urease enzyme on PAH/V2O5-nanorods electrodes. The biosensor could detect urea in a 0.05-5 mM dynamic range. The spin-assisted assembly technique enables the combination of different materials in a simple way and offers advantages for the construction of functional electrodes. (c) 2016 Elsevier B.V. All rights reserved.

Author(s): Vieira, NCS; Avansi, W; Figueiredo, A; Mastelaro, VR & Zucolotto, V.

SENSORS AND ACTUATORS B-CHEMICAL

DOI: 10.1016/j.snb.2016.02.010