Effect of noble metal functionalization and film thickness on sensing properties of sprayed TiO 2 ultra-thin films
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ABABII, Nicolai; HOPPE, Mathias; SHREE, Sindu; VAHL, Alexander; ULFA, Maria; PAUPORTE, Thierry; VIANA, Bruno; CREŢU, Vasile; MAGARIU, Nicolae; POSTICA, Vasilie; ŞONTEA, Victor; TERASA, Maik-Ivo; POLONSKYI, Oleksandr; FAUPEL, Franz; ADELUNG, Rainer; LUPAN, Oleg. Effect of noble metal functionalization and film thickness on sensing properties of sprayed TiO 2 ultra-thin films. In: Sensors and Actuators, A: Physical. 2019, nr. 293, pp. 242-258. ISSN 0924-4247.
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Sensors and Actuators, A: Physical
Numărul 293 / 2019 / ISSN 0924-4247

Effect of noble metal functionalization and film thickness on sensing properties of sprayed TiO 2 ultra-thin films


DOI: 10.1016/j.sna.2019.04.017
Pag. 242-258

Ababii Nicolai1, Hoppe Mathias2, Shree Sindu2, Vahl Alexander2, Ulfa Maria3, Pauporte Thierry3, Viana Bruno3, Creţu Vasile1, Magariu Nicolae1, Postica Vasilie1, Şontea Victor1, Terasa Maik-Ivo2, Polonskyi Oleksandr2, Faupel Franz2, Adelung Rainer2, Lupan Oleg123
 
1 Technical University of Moldova,
2 Institute for Material Science, Christian-Albrechts- University of Kiel,
3 PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris
 
Disponibil în IBN: 27 mai 2019


Rezumat

In this paper, the effect of the thickness of nano-structured TiO 2 thin films (12–40 nm) and successive deposition of different noble metal nanoparticles on the performances of propanol vapor and H 2 gas sensors was investigated. The obtained titania thin films were integrated into a device for UV, gas, and gas/vapor sensing studies at different operating temperatures. Qualitative analysis revealed that the sensor selectivity and its response could be altered by film thickness and type of noble metal nanoparticles. The results indicate that the sensor with 40 nm TiO 2 film has the highest response to H 2 gas (˜ 650%). The fastest response time and the most rapid recovery however were achieved by the sensors made of 12 nm sprayed TiO 2 ultra-thin films, which also offered the highest selectivity to H 2 gas. The best UV detection performances were demonstrated by films functionalized with Au nanoparticles (the I UV /I dark ≈ 80). The structural, chemical, electrical, UV, and gas sensing properties of such films were investigated using SEM, AFM, Raman spectroscopy, electrical characterization, and sensing experiments. It has been clearly demonstrated that films are nanostructured and have mixed phases that contain mostly anatase (annealed at 450 °C) and small amounts of rutile after thermal annealing at higher temperatures (more than 600 °C), as improved materials for sensor applications. Our combined study analyzes the relationship between thickness, electrical properties and the gas/vapor sensing performance of such thin film based TiO 2 gas sensors as well as the effect of different types of noble metal nanoparticles (Au, Ag, Ag-Au and Ag-Pt) deposited on the surface. The enhanced response was attributed to the involvement of noble nanoalloy or nanoparticle interface to titania forming nano-junctions in the gas sensing mechanism. Highly selective and sensitive sensors towards specific gas or vapor molecules are essential for environmental monitoring, and for health and safety issues.

Cuvinte-cheie
Ag-Pt nanoparticle, Functionalization, H 2, Propanol sensor, Spray, TiO2