Gold Nanoparticle-Loaded Silica Nanospheres for Sensitive and Selective Electrochemical Detection of Bisphenol A

Abstract

In this work, silica nanospheres were used as support for gold nanoparticles and applied for bisphenol A electrochemical detection. The development of new silicasupported materials has attracted increasing attention in the scientific world. One approach of interest is using silica nanospheres as support for gold nanoparticles. These materials have a variety of applications in several areas, such as electrochemical sensors. The obtained materials were characterized by solid-state UV−vis spectroscopy, electron microscopy, X-ray diffraction, and electrochemical techniques. The electrode modified with AuSiO 2 700/CHI/Pt was applied as an electrochemical sensor for BPA, presenting an oxidation potential of 0.842 V and a higher peak current among the tested materials. The AuSiO 2 700/CHI/Pt electrode showed a logarithmic response for the detection of BPA in the range of 1−1000 nmol L −1 , with a calculated detection limit of 7.75 nmol L −1 and a quantification limit of 25.8 nmol L −1 . Thus, the electrode AuSiO 2 700/CHI/Pt was presented as a promising alternative to an electrochemical sensor in the detection of BPA.