Investigations of electrochemical luminescence characteristics of ZnO/TiO2 nanotubes electrode and silica-based gel type solvents

• Published in: Surface & coatings technology 2016-05, Vol.294, p.220-224
• Main Authors: Chansri, Pakpoom, Sung, Youl-Moon
• Format: Article
• Language: English
• Subjects: Electrochemical luminescence cell; Electrodes; Nanotubes; Ru(bpy)32; Scanning electron microscopy; Silica gel; Silica gel type solvents; Solvents; TiO2 nanotubes; Titanium dioxide; TNT; Zinc oxide; Zinc oxides
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2016.03.039

In this work, we suggest a simple preparation process for advanced electrochemical luminescence (ECL) cell-based on silica gel type solvents using ZnO/TiO2 nanotubes (ZnO/TNT) electrode. The ionic liquid gel solvent was prepared by adding silica nanopowder in liquid Ru(II) complex. The ZnO/TNT nanotubes were fabricated by anodic oxidation method. The ECL cell-based silica gel type on ZnO/TNT electrode is composed as F-doped SnO2 (FTO) glass/Ru(II) complex [Ru(bpy)32+] mixed silica gel type/ZnO/TNT electrode film/FTO glass. The morphological and structural properties of ZnO/TNT electrode film were confirmed to be successful by a scanning electron microscope (SEM), X-ray diffraction and a spectral brightness analyzer. The threshold voltage at light emission start was 2.0V for ZnO/TNT that was lower than 2.24V for zinc oxide (ZnO), 2.25V for TiO2 nanotube (TNT) and 2.75V for bare FTO. The luminance and electrical properties of the ECL cell-based silica gel type with ZnO/TNT electrode were 253cd/m2 for light intensity, 64mA for output current, and 0.55lm/W for ECL efficiency at 4Vac 60Hz. The peak intensity of the ECL cell-based silica gel type with ZnO/TNT electrode at wavelength was 622nm which responded to dark orange color and had no effect on electrode layers. The ZnO/TNT electrode for ECL cell can increase an ECL efficiency and long lifetime stability. •ECL cell using ZnO/TiO2 nanotubes (ZnO/TNT) and silica gel type solvents is simple product process.•The luminance material of ECL cell was Ru(II) complex mixed silica gel type solvents for increases long life-time stable.•The ECL efficiency of the ECL cell-based silica gel type with ZnO/TNT electrode was more than TNT and ZnO electrode.•The luminance decay of ECL cell-based silica gel type with ZnO/TNT electrode was 28 h more than TNT and ZnO electrode.