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21 results on '"Gapeeva, Anna"'

7. Tetrapodal ZnO-Based Composite Stents for Minimally Invasive Glaucoma Surgery

Author

Gapeeva, Anna, primary, Qiu, Haoyi, additional, Cojocaru, Ala, additional, Arndt, Christine, additional, Riaz, Tehseen, additional, Schütt, Fabian, additional, Selhuber-Unkel, Christine, additional, Mishra, Yogendra Kumar, additional, Tura, Aysegül, additional, Sonntag, Svenja, additional, Gniesmer, Stefanie, additional, Grisanti, Salvatore, additional, Kaps, Sören, additional, and Adelung, Rainer, additional

Published
2023
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10. Zinc Oxide Tetrapods Modulate Wound Healing and Cytokine Release In Vitro—A New Antiproliferative Substance in Glaucoma Filtering Surgery

Author

Sonntag, Svenja Rebecca, primary, Gniesmer, Stefanie, additional, Gapeeva, Anna, additional, Adelung, Rainer, additional, Cojocaru, Ala, additional, Mishra, Yogendra Kumar, additional, Kaps, Sören, additional, Tura, Aysegül, additional, Grisanti, Swaantje, additional, Grisanti, Salvatore, additional, and Nassar, Khaled, additional

Published
2022
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16. Development of Polythiourethane/ZnO-Based Anti-Fouling Materials and Evaluation of the Adhesion of Staphylococcus aureus and Candida glabrata Using Single-Cell Force Spectroscopy

Author

Klemm, Sophie, primary, Baum, Martina, additional, Qiu, Haoyi, additional, Nan, Zibin, additional, Cavalheiro, Mafalda, additional, Teixeira, Miguel Cacho, additional, Tendero, Claire, additional, Gapeeva, Anna, additional, Adelung, Rainer, additional, Dague, Etienne, additional, Castelain, Mickaël, additional, and Formosa-Dague, Cécile, additional

Published
2021
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19. Improved Long‐Term Stability and Reduced Humidity Effect in Gas Sensing: SiO2 Ultra‐Thin Layered ZnO Columnar Films.

Author

Postica, Vasile, Lupan, Oleg, Gapeeva, Anna, Hansen, Luka, Khaledialidusti, Rasoul, Mishra, Abhishek Kumar, Drewes, Jonas, Kersten, Holger, Faupel, Franz, Adelung, Rainer, and Hansen, Sandra

Subjects
ZINC oxide synthesis, ZINC oxide films, HUMIDITY, DENSITY functional theory, VOLATILE organic compounds, CHARGE transfer
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2021
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