Enhanced Electrochemiluminescence Performance of Ru(bpy)₃²⁺/CuO/TiO₂ Nanotube Array Sensor for Detection of Amines

Abstract

Tripropylamine (TPA) is a highly toxic and carcinogenic compound, therefore, TPA concentration in water must be monitored to protect health and the environment. In this paper, an electrochemiluminescent (ECL) sensor was fabricated by immobilising Ru(bpy)32+‐modified CuO nanoparticles (NPs) on a TiO2 nanotube array (TN) electrode. Compared to an ECL sensor fabricated by immobilising Ru(bpy)32+ on a TN only electrode, the as‐prepared sensor displays a 30 % enhanced ECL signal and a detection limit of 9.6×10−10 M at a signal‐to‐noise ratio=3 with the concentration of TPA in a range 1×10−9 to 1×10−5 M. The results from this study indicated a new approach for the enhancement of performance of ECL sensor in detecting TPA in water.

Electrochemical plasmonic optical fiber probe for real-time insight into coreactant electrochemiluminescence

“…The SPR signals exhibit a wider linear response than that of (1.8 -50.0 μmol L -1 ) on indium tin oxide (ITO) electrodes modified with vertically aligned silica mesochannels [56] and that of (up to 10 μmol L -1 ) on TiO 2 electrodes modified with Ru(bpy) 3 2+ /CuO nanoparticles. [57] Furthermore, the ESPR peak shift (λ maxλ min ) is depicted over the concentration of TPrA (see Figure 6c). The linear detection range is surprisingly extended up to 20 mmol L -1 with an R-squared value of 0.…”

Broadband Microwave Signal Dissipation in Nanostructured Copper Oxide at Air‐film Interface**

“…By adsorption of the ECL-active molecule on the surface of the electrode, significant increases in sensitivity should be possible [39]. An ECL sensor fabricated by immobilizing Ru(bpy) 3 2 + -modified CuO nanoparticles (NPs) on a TiO 2 nanotube array (TN) electrode has displayed a 30 % enhanced ECL signal, and a detection limit of 9.6 × 10 À 10 M of tripropylamine (TPA [40]). The addition of the CuO to the n-type TiO 2 nanotubes results in the formation of p-n junctions on TiO 2 À CuO contact, which creates a flux of electrons from TiO 2 to CuO, and flux of holes in the opposite direction.…”