Naslov
Development of microelectrode modified by TiO2 nanoparticles

Autori
Zrinski, Ivana ; Gvozdanović, Tena ; Martinez, Sanja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Sensing in electroanalysis 2017

Mjesto i datum
Pardubice, Češka Republika, 14.11.2017. - 17.11.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Microelectrode ; TiO2 ; Nanoparticles
(microelectrode ; TiO2 ; nanoparticles)

Sažetak
In this study, the electrocatalytic influence of TiO2 nanoparticles on uric acid oxidation on graphite microelectrode has been studied. The measurement was performed at a nanoparticle-free electrode and at an electrode with 10% TiO2 nanoparticle content. On both electrodes, the influence of uric acid concentration as a water- soluble antioxidant standard and the influence of polarization rate on voltammetric response of the system has been studied. The results obtained show that nanoparticles have a significant electrocatalytic effect that is reflected in the occurrence of low potential current waves in the range of 190 to 450 mV and in the appearance of quasireversibility. The effect is visible in a 200 μm uric acid solution at all polarization rates. At polarizaton rates of 1000 mV/s and 5000 mV/s oxidation peaks are the most separated on graphite microelectrode with 10% nanoparticle content and the current response is increasing by adding TiO2. The results indicate the possibility of further testing of TiO2 nanoparticle - graphite paste microelectrodes as electrochemical microsensor for the determination of antioxidant substances in various media in situ. Electrochemical microsensor has low price, good quality and increased sensitivity for use in real systems such as food and beverages. Carbon paste can be easily modified for getting new sensors with desirable, often predefined properties. Popularity of carbon paste is the result of optimal physical chemical and electrochemical properties of the carbon substrate.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Temeljne tehničke znanosti

POVEZANOST RADA