Abstract
3-Aminopropyltrimethoxysilane (3-APTMS) and 3-glycidoxypropyltrimethoxy-silane (3-GPTMS) mediated synthesis of gold nanoparticles (AuNPs) of two different sizes [AuNP1 (10 nm) and AuNP2 (20 nm)] were made and used for nano-composite formation with TiO2 nanoparticle suspension. The resulting TiO2-AuNP1 and TiO2-AuNP2 nanocomposites were used for making chemically modified electrodes to understand the role of nanogeometry in chemical sensing. TiO2-AuNP1 and TiO2-AuNP2 nanocomposites were characterized by transmission electron microscopy and UV-VIS spectroscopy. The analytical results revealed the average size of the nanocomposite in the range of 20-25nm. The nanocomposites were employed for modification of graphite paste electrodes and applied in electrochemical sensing of hydrazine. The results demonstrated that TiO2-AuNP1 exhibit better electrocatalytic activity as compared to that of TiO2-AuNP2 and only TiO2 towards oxidation of hydrazine. Amperometric analysis of hydrazine on these electrodes at the applied potential of 0.4 V vs Ag/AgCl was made to quantify the sensing ability of modified electrodes. The sensitivity and lowest detection limit was found as 25, 57.2 and 145.7 μAmM-1cm-2 and 50, 100, 20 nM for TiO2, TiO2-AuNP2 and TiO2-AuNP1 respectively.
Highlights
In recent years, the chemical modification of electrode surfaces with nanocomposite has emerged as a vibrant area of research especially for electroanalysis because of the unusual property combinations and because of unique design possibilities
Metal oxide composites with other metal nanoparticle’s such as Au, Ag, Pd, Pt and Ru etc. provide good catalytic properties in addition to excellent selectivity towards particular analyte which allow a facile fabrication of electrochemical sensors [11,12,13,14]
We have reported the controlled synthesis of gold nanoparticles (AuNPs) having variable nanogeometry using active role of 3-APTMS and 3-Glycidoxypropyltrimethoxysilane (3-GPTMS) [19]
Summary
The chemical modification of electrode surfaces with nanocomposite has emerged as a vibrant area of research especially for electroanalysis because of the unusual property combinations and because of unique design possibilities. The concert of electrochemical sensor mainly depends on the morphology, size and surface area of MNPs on the modified electrodes. It was planned to make nanocomposite of titanium oxide suspension and different variable size of AuNPs, as such materials have shown promising practical applications in electrocatalysis because TiO2 nanoparticles having high surface area to volume ratio, ion-changeable ability, optical transparency, biocompatible and photocatalytic ability, environmental safety [12,21].
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