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DFT calculation on p-xylene sensing mechanism of (C4H9NH3)2PbI4 single crystal based on physisorption

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Abstract

P-xylene (p-C8H10) is extremely harmful and dangerous to human health due to high toxicity and strong carcinogenicity. Exploring sensitive material to effectively detect p-xylene is of importance. In this paper, perovskite single crystal (C4H9NH3)2PbI4 has been successfully synthesized via solution method. The obtained product was analyzed by single crystal X-ray diffraction. With the space group Pbca, orthorhombic (C4H9NH3)2PbI4 layered perovskite structure consists of an extended two-dimensional network of corner-sharing PbI6 octahedron. Single layer perovskite sheets of distorted PbI6 octahedron alternated with protonated n-butylammonium cation bilayers, which offers many advantages and provides the possibility of forming a gas sensor device based on the change of resistances. Density functional theory (DFT) simulations regarding the adsorption energy revealed that this organic–inorganic hybrid perovskite compound has excellent selectivity toward p-xylene compared with other gases including C2H5OH, C6H6, CH2Cl2, HCHO, CH3COCH3 and C7H8. The calculation of electron density, density of states and electron density difference showed the sensing mechanism of p-C8H10 is mainly derived from physical adsorption–desorption in view of electron transfer.

Graphic abstract

For organic–inorganic hybrid perovskite (C4H9NH3)2PbI4, single layer perovskite sheets of distorted PbI6 octahedron alternated with protonated n-butylammonium cation bilayers (a), which offers many advantages and provides the possibility of forming a gas sensor device based on the change of resistances. Electron density difference calculation shows that adsorption of p-xylene molecule has an obvious effect on the electron distribution of (C4H9NH3)2PbI4, results in electrically polarization as a local manner (b).

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Acknowledgements

This study was financially supported by the Natural Science Foundation of Hebei (Nos. F2020202027 and F2020202067), the Major National Science and Technology Special Projects (No. 2016ZX02301003-004-007), the National Natural Science Foundation of China (No. 21271139) and the Natural Science Foundation of Tianjin (No.17JCTPJC54500).

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Correspondence to Guo-Feng Pan or Li-Jian Bie.

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Zhu, MY., He, P., Yang, XL. et al. DFT calculation on p-xylene sensing mechanism of (C4H9NH3)2PbI4 single crystal based on physisorption. Rare Met. 40, 1571–1577 (2021). https://doi.org/10.1007/s12598-020-01606-y

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