Fabrication of ZnO/Au/prism-based surface plasmon resonance device for gas detection

Abstract

Surface plasmon resonance (SPR) sensing devices have attracted interest both from a fundamental physics perspective and as higly sensitive devices for detecting small chemical and biological objects. In this work, we design SPR device using a modified Kretschmann configuration for gas detection. After gold coating on the flat surface of BK-7 semicylindrical prism, ZnO microstructures which work as sensitive layer, are formed on the gold film surface. The light reflectance is measured for various angles in order to observe the SPR spectra. Next, we measure the shift of SPR angle due to response of ZnO sensitive layer to CO 2 gas. It is found that the absorption of gas molecules on the sensitive layer produces the shift of SPR spectra to the higher incident angle. The change of the light reflectance due to the gas response on the time-dependent characteristics is also studied.

Surface Plasmon Resonance Sensor of CO2 for Indoors and Outdoors

“…Our sensor is smaller than the UV Strip Resistive Thick GEM (S-RETGEM) [8] and measures concentrations of carbon dioxide instead of measuring presence of this gas [9,19] and is able to measure with any value of the humidity unlike the sensor of Vijayan et al [10].…”

“…In 2015, Nuryadi et al manufactured a gas sensor with the Kretschmann configuration, modifying the hemiprism, and after the layer of Au, they used a ZnO layer in a cylindrical way where the CO 2 circulates. This is a sensor of presence; it is not able to measure quantities [19].…”