Ultra violet sensors based on nanostructured ZnO spheres in network of nanowires: a novel approach

Abstract

The ZnO nanostructures consisting of micro spheres in a network of nano wires were synthesized by direct vapor phase method. X-ray Photoelectron Spectroscopy measurements were carried out to understand the chemical nature of the sample. ZnO nanostructures exhibited band edge luminescence at 383 nm. The nanostructure based ZnO thin films were used to fabricate UV sensors. The photoresponse measurements were carried out and the responsivity was measured to be 50 mA W−1. The rise and decay time measurements were also measured.

Ultraviolet Sensors Based on Two-Dimensional Zinc Oxide Structures

“…While a correlation between different forms of ZnO and the response time is difficult to comprehend, it is important to realise that the response time is not only determined by the quality of the ZnO films [66] but also dependent on the electrode spacing of the photodetector [76], which can be expressed as [77]:…”

ZnO Nanorod Arrays Synthesised Using Ultrasonic-Assisted Sol-Gel and Immersion Methods for Ultraviolet Photoconductive Sensor Applications

“…A reduction in size of the ZnO particle to the nanoscale level produces novel and attractive electrical, optical, mechanical, chemical, and physical properties due to quantum confinement effects. Moreover, ZnO nanostructures have a high aspect ratio, or a large surface-to-volume ratio and high porosity, which can fulfil the demand for high performance and efficiency in numerous applications (Lee et al, 2009, Galoppini et al, 2006, Park et al, 2011, Hullavarad et al, 2007.…”

“…Hullavarad et al developed UV sensors based on nanostructured ZnO spheres in a network of nanowires (Hullavarad et al, 2007). They produced the nanostructured ZnO using a direct vapour phase (DVP) technique.…”

Fabrication of ZnO Nanorods by Atmospheric-Pressure Solid-Source CVD Using Ethanol-Assisted Low-Temperature Vaporization

“…ZnO nanorods (NRs) have potential application in solar cells 1,2 , chemical 3 and ultraviolet 4 sensors and piezoelectronic devices 5 in small scales. There have been many reports regarding methods to fabricate ZnO NRs and devices using them.…”