Improved Long-Term Stability and Reduced Humidity Effect in Gas Sensing: SiO2 Ultra-Thin Layered ZnO Columnar Films
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POSTICA, Vasile, LUPAN, Oleg, GAPEEVA, Anna, HANSEN, Luka, KHALEDIALIDUSTI, Rasoul, MISHRA, Abhishek Kumar, DREWES, Jonas, KERSTEN, Holger, FAUPEL, Franz, ADELUNG, Rainer, HANSEN, Sandra. Improved Long-Term Stability and Reduced Humidity Effect in Gas Sensing: SiO2 Ultra-Thin Layered ZnO Columnar Films. In: Advanced Materials Technologies, 2021, nr. 5(6), pp. 1-15. ISSN -. DOI: https://doi.org/10.1002/admt.202001137
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Advanced Materials Technologies
Numărul 5(6) / 2021 / ISSN - /ISSNe 2365-709X

Improved Long-Term Stability and Reduced Humidity Effect in Gas Sensing: SiO2 Ultra-Thin Layered ZnO Columnar Films
DOI:https://doi.org/10.1002/admt.202001137

Pag. 1-15

Postica Vasile1, Lupan Oleg12, Gapeeva Anna2, Hansen Luka2, Khaledialidusti Rasoul3, Mishra Abhishek Kumar4, Drewes Jonas5, Kersten Holger2, Faupel Franz5, Adelung Rainer2, Hansen Sandra2
 
1 Technical University of Moldova,
2 University of Kiel,
3 Norwegian University of Science and Technology, Trondheim,
4 University of Petroleum and Energy Studies (UPES), Bidholi, Dehradun,
5 Institute for Material Science, Christian-Albrechts-University of Kiel
 
 
Disponibil în IBN: 18 mai 2021
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The undoped and metal-doped zinc oxide columnar films (ZnO:Sn, ZnO:Fe, ZnO:Ag, and ZnO:Cu) are covered with an ultra-thin layer of SiO2 (10–20 nm). The electrical, UV, and volatile organic compounds (VOCs) sensing properties are evaluated under different ambient conditions for ≈7 months to investigate the impact of the top SiO2-layer on the long-term stability of samples. The obtained results show a high immunity of sensing properties of SiO2-coated samples to humidity. Furthermore, gas sensing measurements show that the loss in response after 203 days is significantly lower for coated samples indicating higher stability of sensing performance. For ZnO:Fe the gas response is reduced by about 90% after 203 days, but for SiO2-coated ZnO:Fe columnar films the gas response is slightly reduced by only 38%. The density functional theory (DFT) calculations show that water species bind strongly with the surface SiO2 layer atoms with a −0.129 e− charge transfer, which is, much higher compared to the interaction with ethanol and acetone. Calculations show strong binding of water species on the SiO2 layer indicating preferential absorption of water molecules on SiO2. The obtained results demonstrate an important role of the top SiO2 ultra-thin layer in order to produce humidity-tolerant sensitive devices. 
Cuvinte-cheie
gas sensors, long-term stability, nano-crystalline materials, UV photodetectors, ZnO columnar films

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