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Optical CO2 gas sensing based on TiO2 thin films with different thickness modified by silver nanoparticles

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Document pages: 12 pages

Abstract: This paper reports the preparation, characterization and CO2 gas detection performance of optical gas sensors based on single component and heterogeneous nanostructures. One component structures include (I) TiO2 films with different film thicknesses (37.45   nm, 51.92   nm and 99.55 nm   (II) silver nanoparticles (AGNPS) were deposited on glass substrates by wet chemical method. Heterogeneous nanostructures were achieved by modifying AgNPs on pre deposited TiO2 films. X-ray diffraction (XRD) and scanning electron microscopy (SEM) And ellipsometry were used to study the structure, morphology and optical properties of the prepared samples. The XRD analysis of AgNPs confirmed the crystallline nature of prepared particles with average crystallite size of 21 nm, however, in the case of TiO2 films XRD results suggested amorphous structure of all as-deposited films. size 21 nm. The SEM micrographs confirmed the deposition of AgNPs on the TiO2 thin films. With increasing sputtering time, TiO2 films were found to be denser and more compact, indicating a reduced porosity and higher film thickness. CO2 gas-sensing properties were investigated by measuring the optical transmission spectra in alone air and in CO2 gaseous atmosphere at room temperature. It was observed that neither TiO2 thin films even with higher thickness nor alone AgNPs could demonstrate any substantial gas-sensing activity. Nevertheless, TiO2 AgNP hetero-nanostructured substrates exhibited excellent CO2 gas-sensing performance as indicated by a huge change in the transmission spectra. The enhanced sensing efficiency of TiO2 AgNP nanostructures owing to synergistic effects suggests a promising role of our manufactured sensors in practical applications.

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