Abstract：
:In the present work, we applied density functional theory and temperature-dependent Gibbs free energy calculations to wurtzoid structures to explain the sensitivity of ZnO nanocrystals towards chlorine molecules. In agreement with experimental findings, our results revealed that chlorine sensing under ambient conditions is feasible. Higher temperatures increased the sensitivity of ZnO nanocrystals towards chlorine gas molecules. Peak calculated sensitivities were in the temperature ranges (167-220 °C), (447-578 °C) and (952-1159 °C), which is in good agreement with experimentally determined temperatures. According to the calculated Gibbs free energy, these three ranges correspond to the van der Waals attachment of Cl2 molecules on Zn-polar sites, van der Waals attachment of Cl2 molecules on O sites, and dissociation of Cl2 molecules on ZnO nanocrystal surfaces, respectively. The removal of chlorine atoms from the surface of ZnO nanocrystals is difficult at low temperatures because of the high electron affinity of chlorine gas atoms, which results in a long recovery time and accumulation of chlorine atoms and molecules on the ZnO surface. Atomic charges and charge transfer are depicted using natural bond orbital analysis to explain the present mechanisms.
journal_name
J Mol Modeljournal_title
Journal of molecular modelingauthors
Abdulsattar MAdoi
10.1007/s00894-017-3309-9subject
Has Abstractpub_date
2017-04-01 00:00:00pages
125issue
4eissn
1610-2940issn
0948-5023pii
10.1007/s00894-017-3309-9journal_volume
23pub_type
杂志文章abstract：:The structures of the 4,4',4″-tris(N,N-phenyl-3-methylphenylamino)triphenylamine (m-MTDATA) molecule and its dimer in their neutral and positively charged forms were studied by performing quantum-chemical calculations at the Hartree-Fock (HF) and density functional theory (DFT) levels of theory using several exchange-...
journal_title：Journal of molecular modeling
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更新日期：2015-05-01 00:00:00
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更新日期：2012-05-01 00:00:00
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journal_title：Journal of molecular modeling
pub_type： 杂志文章
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更新日期：2013-01-01 00:00:00
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更新日期：2020-06-25 00:00:00
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journal_title：Journal of molecular modeling
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更新日期：2019-05-04 00:00:00
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journal_title：Journal of molecular modeling
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journal_title：Journal of molecular modeling
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更新日期：2012-01-01 00:00:00
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journal_title：Journal of molecular modeling
pub_type： 杂志文章
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更新日期：2015-02-01 00:00:00
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pub_type： 杂志文章
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journal_title：Journal of molecular modeling
pub_type： 杂志文章
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更新日期：2014-11-01 00:00:00
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journal_title：Journal of molecular modeling
pub_type： 杂志文章
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更新日期：2012-01-01 00:00:00
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journal_title：Journal of molecular modeling
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更新日期：2017-06-01 00:00:00
