Surface plasmon assisted toxic chemical NO<sub>2</sub> gas sensor by Au ∕ ZnO functional thin films

Abstract

Abstract. In this short communication, we propose a surface plasmon resonance (SPR) sensor based on a ZnO / Au hybrid thin-film material structure and experimentally investigate its sensitivity improvement. The Kretschmann-based SPR sensor utilizes ZnO thin films and nanostructures for performance enhancement. The advancement in SPR technology relies on a low-cost, high-sensitivity, and high-selectivity sensor. Metal oxide (MO) has been incorporated into the SPR sensor to be used for detection of biological and chemical compounds. ZnO as one of the metal oxides is an attractive material due to its unique physical and optical properties. Numerous techniques for fabrication and characterization of ZnO on SPR gold substrate have been studied. The mechanism for gas and biomolecule detection depends on their interaction with the ZnO surface, which is mainly attributed to the high isoelectric point of ZnO. There are several types of ZnO nanostructures which have been employed for SPR application based on the Kretschmann configuration. In the future, the thin film and nanostructures of ZnO could be a potential application for miniature design, robust, high sensitivity, and a low-cost portable type of SPR biosensor to be used for on-site testing in a real-time and label-free manner. The present work includes the application of a developed SPR setup for gas sensing at room temperature using a specially designed gas cell. The change in the optical properties of dielectric layers (ZnO) with adsorption of gases (NO2) in order to develop an optical sensor has been presented. The obtained results emphasize the applications of an SPR setup for the study of interaction of adsorbed gas molecules, with dielectrics and gas sensing.

Ultrananocrystalline diamond‐like carbon (UN‐DLC) assembled on epitaxial ZnO film by PLD technique and SIMS Raman Rutherford spectroscopic fingerprint investigation

“…These kinds of UNDLC and ZnO thin films could be very useful to hybrid electronic sensors and energy system. [ 35 ]…”

Heterojunctions of rGO/Metal Oxide Nanocomposites as Promising Gas-Sensing Materials—A Review

“…[128,129] Optical Fluorescence, chemiluminescence, bioluminescence, surface plasmon scattering, evanescent waves interferometry Quantify various properties of light, such as absorbance, photoluminescence, fluorescence, refractive index, optothermal effect frequency, wavelength, and polarization. These sensors rely on light detectors that convert light into electrical signals [130,131] The measurand is converted to a voltage induced in the conductor via a change in the magnetic flux and in the absence of excitation. The electromagnetic transducer self-generating active transducers by the motion between a piece of magnet and an electromagnet is responsible for the change in flux [134][135][136] Piezoresistive Capacitive pressure sensor, piezoelectric pressure sensor, Microelectromechanical Systems (MEMS) pressure sensor, optical pressure sensors The basic principle of the piezoresistive pressure sensor is based on the use of a strain gauge made from a conductive material that changes its electrical resistance when it is stretched.…”

Development of electrochemical sensors based on silver nanoparticles electrodeposited on gold screen-printed electrodes: application to nitrate trace analysis in water

“…FIA offers interesting advantages such as versatility, accuracy, low cost, speed and automation, among others. Modification of the surfaces of such electrochemical sensors with nanomaterials can enhance these advantages due to their high surface area, high electrical conductivity, high catalytic activity and strong adsorption capability, which have made them very valuable (Ahmad et al, 2017;Ben Messaoud et al, 2018, 2017bBen Jaballah et al, 2022Gaur et al, 2021;Paulraj et al, 2021Paulraj et al, , 2020Lokesh et al, 2016;Thanigai Arul et al, 2016;Saasa et al, 2015). Some of the nanomaterials which have been used as catalysts for the electro-reduction of nitrate are platinum (Dima et al, 2003), copper (Motaghedifard et al, 2021), carbon (Wang et al, 2018), gold (Zhao et al, 2019) and silver (Wang et al, 2021a).…”