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

Typical response of PAH/V2O5-nanorods as a biosensor against different additions of urea to the solution measured. Measurement conditions: 10mM phosphate buffer, pH 7.5. [Display omitted] •Spin-assisted assembly technique enables the combination of different materials in a simple way for biosensors...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2016-06, Vol.229, p.461-465
Main Authors: Vieira, Nirton C.S., Avansi, Waldir, Figueiredo, Alessandra, Mastelaro, Valmor R., Zucolotto, Valtencir
Format: Article
Language:English
Subjects:
Assembly
Biosensors
Electrodes
Nanorods
pH sensor
Polyallylamine hydrochloride
Spin-assisted
Urea biosensor
Ureas
Vanadium pentoxide
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Summary:Typical response of PAH/V2O5-nanorods as a biosensor against different additions of urea to the solution measured. Measurement conditions: 10mM phosphate buffer, pH 7.5. [Display omitted] •Spin-assisted assembly technique enables the combination of different materials in a simple way for biosensors fabrication.•Vanadium pentoxide nanorods (V2O5-nanorods) and poly(allylamine hydrochloride) (PAH) were assembled onto gold-coated substrates.•PAH/V2O5-nanorods detection can detect pH and urea with high sensitivity via potentiometric measurements 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 52–61mV/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 0.05–5mM 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.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.02.010