Postsynthetic-Modified PANI/MOF Composites with Tunable Thermoelectric and Photoelectric Properties

Wenjuan Xu; Yujie Zhao; Huarui Wang; Hongfei Wang; Fangfang Pan; Ruixue Xu; Hongwei Hou

doi:10.1002/chem.202005474

Postsynthetic-Modified PANI/MOF Composites with Tunable Thermoelectric and Photoelectric Properties

Chemistry. 2021 Mar 12;27(15):5011-5018. doi: 10.1002/chem.202005474. Epub 2021 Feb 19.

Authors

Wenjuan Xu¹, Yujie Zhao¹, Huarui Wang², Hongfei Wang¹, Fangfang Pan³, Ruixue Xu¹, Hongwei Hou¹

Affiliations

¹ The College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.
² The College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, 471022, China.
³ College of Chemistry, Central China Normal University, Wuhan, 430079, China.

PMID: 33438786
DOI: 10.1002/chem.202005474

Abstract

A 3D Co-based metal-organic framework (Co-MOF) with two kinds of large pores filled by free Co²⁺ ions and ligands was synthesized and characterized. To expand the MOF structure and conductivity, the free Co²⁺ ions and ligands were exchanged by conductive ionic liquid EtpyBr and photosensitive AgNO₃ through single crystal-to-single crystal transformation, which produced structure-changed 3D MOFs Co-MOF-Br and Co-Ag-MOF, which were characterized by single-crystal X-ray diffraction. Incorporating small quantities of doped polyaniline (PANI) with redox activity into the pores could further tune the stability and conductivity of the three MOFs. The PANI/MOFs all show outstanding electrical conductivity (≈10^-2 S cm^-1 ), and PANI/Co-MOF-Br has the largest p-type Seebeck coefficient of 66.6 μV K^-1 . PANI/Co-MOF-Br and PANI/Co-Ag-MOF have 4 and 15 times higher photocurrent density compared with PANI/Co-MOF, respectively. This work sheds light on the design of advanced electrically conductive 3D MOFs.

Keywords: cobalt; conducting materials; metal-organic frameworks; organic-inorganic hybrid composites; postsynthetic modification.

Abstract

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