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Multifunctional materials: A case study of the effects of metal doping on ZnO Tetrapods with bismuth and tin oxides

Postica, Vasile, Gröttrup, Jorit, Adelung, Rainer, Lupan, Oleg, Mishra, Abhishek Kumar, De Leeuw, Nora, Ababii, Nicolai, Carreira, José F. C., Rodrigues, Joana, Sedrine, Nebiha Ben, Correia, Maria Rosário, Monteiro, Teresa, Sontea, Victor and Mishra, Yogendra Kumar 2017. Multifunctional materials: A case study of the effects of metal doping on ZnO Tetrapods with bismuth and tin oxides. Advanced Functional Materials 27 (6) , 1604676. 10.1002/adfm.201604676

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: CO; gas sensors; hybrid 3D networks; nanosensors; p-type; ZnO tetrapods
Publisher: Wiley
ISSN: 1616-301x
Funders: EPSRC
Date of First Compliant Deposit: 6 February 2017
Date of Acceptance: 30 December 2016
Last Modified: 07 Sep 2017 07:52

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