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ACS Appl Mater Interfaces

Title:		Tuning ZnO Sensors Reactivity toward Volatile Organic Compounds via Ag Doping and Nanoparticle Functionalization
Author(s):		Postica V; Vahl A; Santos-Carballal D; Dankwort T; Kienle L; Hoppe M; Cadi-Essadek A; de Leeuw NH; Terasa MI; Adelung R; Faupel F; Lupan O;
Address:		"Center for Nanotechnology and Nanosensors, Department of Microelectronics and Biomedical Engineering , Technical University of Moldova , 168 Stefan cel Mare Av. , MD-2004 Chisinau , Republic of Moldova. School of Chemistry , Cardiff University , Main Building, Park Place, Cardiff CF10 3AT , United Kingdom. Department of Earth Sciences , Utrecht University , Princetonplein 8A , 3584 CD Utrecht , The Netherlands"
Journal Title:		ACS Appl Mater Interfaces
Year:		2019
Volume:		20190814
Issue:		34
Page Number:		31452 - 31466
DOI:		10.1021/acsami.9b07275
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Print) 1944-8244 (Linking)
Abstract:		"Nanomaterials for highly selective and sensitive sensors toward specific gas molecules of volatile organic compounds (VOCs) are most important in developing new-generation of detector devices, for example, for biomarkers of diseases as well as for continuous air quality monitoring. Here, we present an innovative preparation approach for engineering sensors, which allow for full control of the dopant concentrations and the nanoparticles functionalization of columnar material surfaces. The main outcome of this powerful design concept lies in fine-tuning the reactivity of the sensor surfaces toward the VOCs of interest. First, nanocolumnar and well-distributed Ag-doped zinc oxide (ZnO:Ag) thin films are synthesized from chemical solution, and, at a second stage, noble nanoparticles of the required size are deposited using a gas aggregation source, ensuring that no percolating paths are formed between them. Typical samples that were investigated are Ag-doped and Ag nanoparticle-functionalized ZnO:Ag nanocolumnar films. The highest responses to VOCs, in particular to (CH(3))(2)CHOH, were obtained at a low operating temperature (250 degrees C) for the samples synergistically enhanced with dopants and nanoparticles simultaneously. In addition, the response times, particularly the recovery times, are greatly reduced for the fully modified nanocolumnar thin films for a wide range of operating temperatures. The adsorption of propanol, acetone, methane, and hydrogen at various surface sites of the Ag-doped Ag(8)/ZnO(0001) surface has been examined with the density functional theory (DFT) calculations to understand the preference for organic compounds and to confirm experimental results. The response of the synergistically enhanced sensors to gas molecules containing certain functional groups is in excellent agreement with density functional theory calculations performed in this work too. This new fabrication strategy can underpin the next generation of advanced materials for gas sensing applications and prevent VOC levels that are hazardous to human health and can cause environmental damages"
Keywords:		Ag nanoparticles Dft VOC sensors columnar films surface functionalization;
Notes:		"PubMed-not-MEDLINEPostica, Vasile Vahl, Alexander Santos-Carballal, David Dankwort, Torben Kienle, Lorenz Hoppe, Mathias Cadi-Essadek, Abdelaziz de Leeuw, Nora H Terasa, Maik-Ivo Adelung, Rainer Faupel, Franz Lupan, Oleg eng 2019/07/25 ACS Appl Mater Interfaces. 2019 Aug 28; 11(34):31452-31466. doi: 10.1021/acsami.9b07275. Epub 2019 Aug 14"