Conţinutul numărului revistei |
Articolul precedent |
Articolul urmator |
547 0 |
SM ISO690:2012 LUPAN, Oleg, ABABII, Nicolai, SANTOS-CARBALLAL, David, TERASA, Maik-Ivo, MAGARIU, Nicolae, ZAPPA, Dario, COMINI, Elisabetta, PAUPORTE, Thierry, SIEBERT, Leonard, FAUPEL, Franz, VAHL, Alexander, HANSEN, Sandra, DE LEEUW, Nora H., ADELUNG, Rainer. Tailoring the selectivity of ultralow-power heterojunction gas sensors by noble metal nanoparticle functionalization. In: Nano Energy, 2021, vol. 88, p. 0. ISSN 2211-2855. DOI: https://doi.org/10.1016/j.nanoen.2021.106241 |
EXPORT metadate: Google Scholar Crossref CERIF DataCite Dublin Core |
Nano Energy | |
Volumul 88 / 2021 / ISSN 2211-2855 | |
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DOI:https://doi.org/10.1016/j.nanoen.2021.106241 | |
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Rezumat | |
Heterojunctions are used in solar cells and optoelectronics applications owing to their excellent electrical and structural properties. Recently, these energy-efficient systems have also been employed as sensors to distinguish between individual gases within mixtures. Through a simple and versatile functionalization approach using noble metal nanoparticles, the sensing properties of heterojunctions can be controlled at the nanoscopic scale. This work reports the nanoparticle surface functionalization of TiO2/CuO/Cu2O mixed oxide heterostructures, where the gas sensing selectivity of the material is tuned to achieve versatile sensors with ultra-low power consumption. Functionalization with Ag or AgPt-nanoclusters (5–15 nm diameter), changed the selectivity from ethanol to butanol vapour, whereas Pd-nanocluster functionalization shifts the selectivity from the alcohols to hydrogen. The fabricated sensors show excellent low power consumption below 1 nW. To gain insight into the selectivity mechanism, density functional theory (DFT) calculations have been carried out to simulate the adsorption of H2, C2H5OH and n-C4H9OH at the noble metal nanoparticle decorated ternary heterostructure interface. These calculations also show a decrease in the work function by ~2.6 eV with respect to the pristine ternary heterojunctions. This work lays the foundation for the production of a highly versatile array of sensors of ultra-low power consumption with applications for the detection of individual gases in a mixture. |
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Cuvinte-cheie gas sensing, Heterojunctions, Low-energy, Nanolayered materials, Semiconductor oxides, Ultralow power |
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