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M. V. Kovalenko, O. V. Bovgyra, V. Ye. Dzikovskyi, R. V. Bovhyra
«Electronic Structure of Nanoporous Zinc Oxide»
PACS numbers: 61.43.Bn, 61.48.-c, 62.23.St, 71.15.Dx, 71.15.Mb, 71.20.Nr, 82.75.Fq
Nanoporous phases or polymorphs are different inorganic solid structures of the same composition with corresponding bulk crystal usually have vary properties and applications. Thereby, synthesizing or predicting new classes of nanophases for an individual compound are of extensive significance and have been attaining appreciable interest. A few assembled nanoporous phases (SOD, LTA and FAU) based on fullerene-like nanoclusters of ZnO with novel structures and properties have been predicted using a ‘bottom–up’ approach within the density functional theory with Hubbard corrections for Coulomb interaction (GGA + U method). Among these structures, three phases are reported for the first time (CAN, LOS and FRA), which could considerably extend the family of nanoporous phases of ZnO. We also show that all these nanoporous phases can be classified analogically to the aluminosilicate-zeolites’ inorganic open-framework compounds. The structural and electronic properties of these nanoporous ZnO phases have been investigated. The hollow cage structures of the appropriate building block are well saved in all of them that leads to their high elasticity and flexibility as well as low-density nanoporosity. Furthermore, the electronic properties of the separate components are also preserved. The band analysis detects that these new nanophases are semi-conductive with large value of band gap comparing to a bulk crystal of ZnO. We suggest that nanoporous character of such structures could be applied as a band-gap engineering method for morphologically and electronically oriented functional materials. Furthermore, due to nanoporosity of these phases, it could be used for gas separation, heterogeneous catalysis, water purification, batteries, etc. In addition, such researches provide a basis for further successful building of other nanoporous phases of semiconducting II–VI compounds, where different nanophases might be also observed.
Keywords: ZnO, nanoporous phase, electronic properties, DFT, Hubbard corrections, band gap
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