Multifunctional Materials: A Case Study of the Effects of Metal Doping on ZnO Tetrapods with Bismuth and Tin Oxides.

Postica, V., Gröttrup, J., Adelung, Rainer, Lupan, O., Mishra, A. K., de Leeuw, N. H., Ababii, N., Carreira, J. F. C., Rodrigues, J., Sedrine, N. B., Correia, M. R., Monteiro, T., Sontea, V. and Mishra, Y. K. (2016) Multifunctional Materials: A Case Study of the Effects of Metal Doping on ZnO Tetrapods with Bismuth and Tin Oxides. Advanced Functional Materials, 27 (6). p. 1604676. DOI 10.1002/adfm.201604676.

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Abstract

Hybrid metal oxide nano‐ and microstructures exhibit novel properties, which make them promising candidates for a wide range of applications, including gas sensing. In this work, the characteristics of the hybrid ZnO‐Bi2O3 and ZnO‐Zn2SnO4 tetrapod (T) networks are investigated in detail. The gas sensing studies reveal improved performance of the hybrid networks compared to pure ZnO‐T networks. For the ZnO‐T‐Bi2O3 networks, an enhancement in H2 gas response is obtained, although the observed p‐type sensing behavior is attributed to the formed junctions between the arms of ZnO‐T covered with Bi2O3 and the modulation of the regions where holes accumulate under exposure to H2 gas. In ZnO‐T‐Zn2SnO4 networks, a change in selectivity to CO gas with high response is noted. The devices based on individual ZnO‐T‐Bi2O3 and ZnO‐T‐Zn2SnO4 structures showed an enhanced H2 gas response, which is explained on the basis of interactions (electronic sensitization) between the ZnO‐T arm and Bi2O3 shell layer and single Schottky contact structure, respectively. Density functional theory‐based calculations provide mechanistic insights into the interaction of H2 and CO gas molecules with Bi‐ and Sn‐doped ZnO(0001) surfaces, revealing changes in the Fermi energies, as well as charge transfer between the molecules and surface species, which facilitate gas sensing.

Document Type: Article
Keywords: CO gas sensors hybrid 3D networks nanosensors p‐type ZnO tetrapods
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1002/adfm.201604676
ISSN: 1616-301X
Date Deposited: 14 Dec 2017 12:33
Last Modified: 03 Jun 2019 16:12
URI: http://oceanrep.geomar.de/id/eprint/40636

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