Please use this identifier to cite or link to this item: http://cris.utm.md/handle/5014/762
Title: Tailoring the selectivity of ultralow-power heterojunction gas sensors by noble metal nanoparticle functionalization
Authors: LUPAN, Oleg 
ABABII, Nicolai 
SANTOS-CARBALLAL, David 
TERASA, Maik-Ivo 
MAGARIU, Nicolae 
ZAPPA, Dario 
COMINI, Elisabetta 
PAUPORTÉ, Thierry 
SIEBERT, Leonard 
FAUPEL, Franz 
VAHL, Alexander 
HANSEN, Sandra 
DE LEEUW, Nora 
ADELUNG, Rainer 
Keywords: Nanolayered materials;Heterojunctions;Semiconductor oxides;Gas sensing;Low-energy;Ultralow power
Issue Date: 2021
Source: Oleg Lupan, Nicolai Ababii, David Santos-Carballal, Maik-Ivo Terasa, Nicolae Magariu, Dario Zappa, Elisabetta Comini, Thierry Pauporté, Leonard Siebert, Franz Faupel, Alexander Vahl, Sandra Hansen, Nora H. de Leeuw, Rainer Adelung, Tailoring the selectivity of ultralow-power heterojunction gas sensors by noble metal nanoparticle functionalization, Nano Energy, Volume 88, 2021, 106241, ISSN 2211-2855, https://doi.org/10.1016/j.nanoen.2021.106241.
Journal: Nano Energy 
Abstract: 
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.
URI: http://cris.utm.md/handle/5014/762
ISSN: 2211-2855
DOI: 10.1016/j.nanoen.2021.106241
Appears in Collections:Journal Articles

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