CdSe/TiO₂NTs Heterojunction-Based Nonenzymatic Photoelectrochemical Sensor for Glucose Detection

Abstract

Compared with a single semiconductor, the heterojunction formed by two different semiconductors usually has higher light utilization and better photoelectric performance. By using stable TiO 2 nanotubes as the main subject, CdSe/TiO 2 NTs heterojunctions were synthesized by a hydrothermal method. XRD, TEM, SEM, PL, UV−vis, and EIS were used to characterize the fabricated CdSe/TiO 2 NTs. Under visible light irradiation, CdSe/TiO 2 NTs heterojunctions exhibited a higher absorption intensity and lower degree of photogenerated carrier recombination than TiO 2 . The electrons and holes were proven to be effectively separated in this heterojunction via theoretical calculation. Under CdSe/TiO 2 NTs' optimal conditions, the glucose concentrations (10−90 μM) had a linear relationship with the photocurrent value, and the detection limit was 3.1 μM. Moreover, the CdSe/ TiO 2 NTs sensor exhibited good selectivity and stability. Based on the experimental data and theoretical calculations, its PEC sensing mechanism was also illuminated.

Glucose Sensing Optionally in Optical and Optoelectrical Modes Based on Au-TiO2 Schottky Nanojunctions

“…To illustrate the performance of the Au NHAs/TiO 2 /Al structure for real glucose sensing, we further evaluated its selectivity, anti-interference, and stability. As shown in Figure 8(a), where we simulated the real situation in human body fluids by adding the substances coexisting with the body fluids [20], such as Urea, LA, DA, NaCl, UA, and Suc, as interfering substances to the background solution [25,26]. It can be seen that when these interfering substances are added, the corresponding photocurrents are mildly different from that in the background solution, while there is a significant increase in the photocurrent when 3 mM glucose is added.…”

Advances in electrochemical sensors for real-time glucose monitoring

“…21,23,129 This introduction explores the principles behind metal oxide-based electrochemical sensors and their applications in sweat analysis for various healthcare and performance-related purposes. Li et al 130 developed a cadmium selenide/titanium dioxide nanotube (CdSe/TiO 2 NTs) heterojunction as nonenzymatic photoelectrochemical sensor for precise glucose detection from 90 down to 10 μM (Fig. 12a).…”