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539.23:681.586 (1) |
Properties and structure of molecular systems (224) |
Precision mechanisms and instruments (79) |
SM ISO690:2012 TSIULYANU , Dumitru, MOCREAC, Olga, AFANASIEV, Andrei, MONAICO, Eduard. Gas sensitive films based on Te-SnO2 nanocomposite on flexible substrate. In: Journal of Engineering Sciences, 2022, vol. 29, nr. 3, pp. 45-58. ISSN 2587-3474. DOI: https://doi.org/10.52326/jes.utm.2022.29(3).04 |
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Journal of Engineering Sciences | ||||||
Volumul 29, Numărul 3 / 2022 / ISSN 2587-3474 /ISSNe 2587-3482 | ||||||
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DOI:https://doi.org/10.52326/jes.utm.2022.29(3).04 | ||||||
CZU: 539.23:681.586 | ||||||
Pag. 45-58 | ||||||
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Flexible films based on novel Te-SnO2 nanocomposites were fabricated for detection of toxic gases at room temperature. The Te-SnO2 nanocomposites were obtained via solvohermal recrystallization of pure crystalline tellurium in nitric acid in the presence of tin chloride. The energy-dispersive X-ray spectroscopy (EDX) and XRD analyses have shown that the Te-SnO2 films consists of fluffy structures of tiny agglomerates of the nanodimensional irregular blocks of hexagonal Te and polycrystalline SnO2. Both current / voltage and transient characteristics of the flexible Te-SnO2 films were investigated at room temperature in ambiance comprising different toxic gases. The maximum selectivity was revealed toward NO2, for which in the dynamic range of 0.5 - 5.0 ppm of NO2, the response and recovery times are about 30 s and 150 s respectively. Analysis of the response kinetics meets the Langmuir theory of adsorption. This study revealed a simple route of fabrication of the printable Te-SnO2 nanocomposites that can be used in electronics, inclusive for development of flexible and compostable gas sensors, operating at room temperature. |
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Cuvinte-cheie nanocomposites, Te-SnO2, Conductometric sensors, NO2, nanocompozite, Te-SnO2, Senzori conductometrici, NO2 |
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