Abstract
The development of a simple, low-cost sensor for the effective sensing of multiple gases in industrial or residential zones has been in high demand in recent days. In this article, we have proposed an optical sensor for the dual sensing of oxygen (O2) and ammonia (NH3) gases, which consists of oxygen and ammonia-sensitive fluorescent dyes coated individually on both sides of a glass substrate. An ethyl cellulose (EC) matrix doped with platinum (II) meso-tetrakis (pentafluorophenyl) porphyrin (PtTFPP) serves as the oxygen-sensing material, whereas the NH3-sensing material includes an eosin Y fluorescent indicator immobilized within a cellulose acetate (CA) matrix. Both the oxygen and ammonia-sensitive materials were excited by the same LED light source with a 405 nm peak wavelength, while the corresponding emissions were detected separately for the selective sensing of the gases under study. The dual gas sensor exhibits maximum sensitivities of around 60 and 20 for oxygen and ammonia gases, respectively. The high sensitivity and selectivity of the proposed optical dual sensor suggests the feasibility of the simultaneous sensing of oxygen and ammonia for practical applications.
Highlights
A large number of optical chemical sensors have been reported based on several spectroscopic methods including absorptiometry, reflectometry, fluorescence, infrared and Raman spectroscopies, interferometry, and surface plasmon resonance
The absorption spectra were captured from individual materials, while the fluorescence spectrum was captured from the dual sensor i.e., the combined fluorescence spectrum of platinum (II) meso-tetrakis (pentafluorophenyl) porphyrin (PtTFPP)
This work presents a novel optical sensor for the dual sensing of oxygen and ammonia concentrations based on sensing materials coated on a glass substrate
Summary
A large number of optical chemical sensors have been reported based on several spectroscopic methods including absorptiometry, reflectometry, fluorescence, infrared and Raman spectroscopies, interferometry, and surface plasmon resonance. The sensors using analyte-sensing fluorescence dyes usually show better sensitivity. Multiple parameters such as decay time, energy transfer, fluorescence quenching, polarization, etc. Numerous individual O2 and NH3 sensors are already reported based on the fluorescence quenching of various molecules in the presence of analyte gases [2]. An efficient dual sensor for O2 and NH3 gases based on fluorescence quenching is still lacking. An optical gas sensor can determine oxygen concentration by monitoring the reduction in the fluorescence intensity of a dye molecule via its quenching by oxygen
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