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http://repository.kln.ac.lk/handle/123456789/27975
Title: | Nb2O5 Microcolumns for Ethanol Sensing |
Authors: | Kumarage, Gayan W. C. Panamaldeniya, Shasika A. Maraloiu, Valentin A. Dassanayake, Buddhika S. Gunawardhana, Nanda Comini, Elisabetta |
Keywords: | Nb2O5; microcolums: MOX; gas sensors; ethanol sensor |
Issue Date: | 2024 |
Citation: | Kumarage, G.W.C.; Panamaldeniya, S.A.; Maraloiu, V.A.; Dassanayake, B.S.; Gunawardhana, N.; Comini, E. Nb2O5 Microcolumns for Ethanol Sensing. Sensors 2024, 24,1851. https://doi.org/10.3390/s24061851 |
Abstract: | Pseudohexagonal Nb2O5 microcolumns spanning a size range of 50 to 610 nm were synthesized utilizing a cost-effective hydrothermal process (maintained at 180 ◦C for 30 min), followed by a subsequent calcination step at 500 ◦C for 3 h. Raman spectroscopy analysis unveiled three distinct reflection peaks at 220.04 cm−1, 602.01 cm−1, and 735.3 cm−1, indicative of the pseudohexagonal crystal lattice of Nb2O5. The HRTEM characterization confirmed the inter-lattice distance of 1.8 Å for the 110 plain and 3.17 Å for the 100 plain. The conductometry sensors were fabricated by drop-casting a dispersion of Nb2O5 microcolumns, in ethanol, on Pt electrodes. The fabricated sensors exhibited excellent selectivity in detecting C2H5OH (ΔG/G = 2.51 for 10 ppm C2H5OH) when compared to a variety of tested gases, including CO, CO2, NO2, H2, H2S, and C3H6O. The optimal operating temperature for this selective detection was determined to be 500 ◦C in a dry air environment. Moreover, the sensors demonstrated exceptional repeatability over the course of three testing cycles and displayed strong humidity resistance, even when exposed to 90% relative humidity. This excellent humidity resistance gas sensing property can be attributed to their nanoporous nature and elevated operating temperature. |
URI: | http://repository.kln.ac.lk/handle/123456789/27975 |
Appears in Collections: | Physics |
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