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Tin oxide (SnO2) thin films were deposited onto glass substrates using DC magnetron sputtering system as a CO gas sensor. The dependence of the deposition time on structural, morphological and CO gas sensing properties of SnO2 thin films were investigated. The synthesised SnO2 thin films were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and surface profiler. Also the CO gas sensing properties of SnO2-deposited thin films were performed against a wide range of concentration of CO gas. XRD analysis demonstrated that the degree of crystallinity of the deposited SnO2 thin films strongly depended on the deposition time. Also, SEM and AFM analyses revealed that the size of nanoparticles/agglomerates, and both average and rms surface roughness were enhance with increasing the deposition time. Gas sensors based on these SnO2 nanolayers showed an acceptable response to CO at various concentrations. Also it has been demonstrated that SnO2 sensors are highly suitable for sensing CO gas at comparatively lower operating temperatures.

The aim of this paper is to study degradation of a bromophenol blue molecule (C19H10Br4O5S) using direct irradiation of cold atmospheric argon plasma jet. The pH of the bromophenol blue solution has been measured as well as its absorbance spectra and conductivity before and after the irradiation of non-thermal plasma jet in various time durations. The results indicated that the lengths of conjugated systems in the molecular structure of bromophenol blue decreased, and that the bromophenol blue solution was decolorized as a result of the decomposition of bromophenol blue. This result shows that non-thermal plasma jet irradiation is capable of decomposing, and can also be used for water purification.

This research study aims to decompose bromocresol green (C21H14Br4O5S) using direct irradiation of a nonthermal atmospheric pressure plasma jet. The absorbance spectra of the bromocresol green solution were measured, as was its electrical conductivity and its pH before and after different durations of irradiation. The results showed that the lengths of conjugated systems in the molecular structure of bromocresol green decreased, and the bromocresol green solution was decolorized as a result of the decomposition of bromocresol green. This result indicates that cold atmospheric pressure plasma jet irradiation is capable of decomposing and can also be used for water purification.