Tuning the Reactivity of Ultralow Power Heterojunction Sensors toward H2 and VOCs through Noble Metal Nanoparticle Functionalization - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Nano Energy Année : 2021

Tuning the Reactivity of Ultralow Power Heterojunction Sensors toward H2 and VOCs through Noble Metal Nanoparticle Functionalization

Résumé

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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hal-03367679 , version 1 (06-10-2021)

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Oleg Lupan, Nicolai Ababii, David Santos-Carballal, Maik-Ivo Terasa, Nicolae Magariu, et al.. Tuning the Reactivity of Ultralow Power Heterojunction Sensors toward H2 and VOCs through Noble Metal Nanoparticle Functionalization. Nano Energy, 2021, 88, pp.106241. ⟨10.1016/j.nanoen.2021.106241⟩. ⟨hal-03367679⟩
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