Fabrication of Highly Uniform Gold Nanoparticles-Titanium Dioxide Nanotube Arrays for H2O2 Sensing

Abstract

This research was to prepare the titanium dioxide nanotube arrays (TiNT arrays) and deposit the Au nanoparticles on its surface using the pulse electrodeposition technique. The Au nanoparticles-TiNT arrays (AuNP-TiNT arrays) were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction, and cyclic voltammetry. The results showed that the Au nanoparticles were uniformly dispersed on the TiNT array surface. The size and loading of Au nanoparticles can be controlled by deposition time, deposition potential, and concentration of HAuCl. The AuNP-TiNT arrays were then used as a working electrode for hydrogen peroxide (HO) detection. Compared with the pure TiNT array electrode, the AuNP-TiNT array electrode had higher sensitivity for the detection of HO and thus provided a simple, promising, and cost-effective sensing platform for the development of enzyme-based biosensors.

A QCM immunosensor employing signal amplification strategies by enlarging the size of nanoparticles using gold or silver staining

“…TiO 2 nanoparticles can be applied as photocatalyst for signal amplification by silver staining in immunosensors. [31][32][33][34][35][36] As a semiconductor photocatalyst, TiO 2 nanoparticles cause charge separation into positive holes and electrons on the particle surface when the surface is exposed to ultraviolet light, and the electrons can reduce surrounding molecules, such as silver ions, in the medium. 31 Piezoelectric immunosensors capable of detecting mass changes are the best applications of nanoparticles and subsequent signal amplification strategies.…”

Colorimetric Sensor for Thiocyanate Based on Anti-aggregation of Gold Nanoparticles in the Presence of 2-Aminopyridine

“…In recent years, colorimetric sensors have received more and more attention due to their simplicity, low cost and high sensitivity [13][14][15] . The gold nanoparticles (AuNPs) sensors are an important colorimetric analysis method, which can be visually observed and stabilized due to changes in its color [16][17][18][19][20] . The AuNPs in the dispersed state are wine red, but blue in the aggregate state.…”