High responsivity of ultraviolet sensor-based rutile-phased TiO2 nanorod arrays using different bias voltage

Abstract

Highly oriented rutile titanium dioxide (TiO2) nanorod arrays were grown on fluorine-doped tin oxide (FTO) substrate using a hydrothermal method. X-ray diffraction, Raman spectra, field emission-scanning electron microscopy, and ultraviolet-visible spectroscopy were conducted to determine the structural, morphological, and optical properties of the sample. The synthesized TiO2 nanorod arrays exhibited tetragonal rutile structure. The photocurrent analysis was done by using photoelectrochemical method where different bias voltage (0 V to 0.9 V) was applied. The photocurrent value shows acceptable difference with increasing bias voltage. The TiO2 nanorod array (TNAs) UV sensors show high responsivity as indicated by the fast rise and decay time of the photocurrent of less than 1 s with every bias voltage applied.