Face-to-Face Growth of Wafer-Scale 2D Semiconducting MOF Films on Dielectric Substrates

Youxing Liu; Yanan Wei; Minghui Liu; Yichao Bai; Xinyu Wang; Shengcong Shang; Changsheng Du; Wenqiang Gao; Jianyi Chen; Yunqi Liu

doi:10.1002/adma.202007741

Face-to-Face Growth of Wafer-Scale 2D Semiconducting MOF Films on Dielectric Substrates

Adv Mater. 2021 Apr;33(13):e2007741. doi: 10.1002/adma.202007741. Epub 2021 Feb 17.

Authors

Youxing Liu^{1

2}, Yanan Wei^{2

3}, Minghui Liu^{1

2}, Yichao Bai^{1

2}, Xinyu Wang^{1

2}, Shengcong Shang^{1

2}, Changsheng Du^{1

2}, Wenqiang Gao^{1

2}, Jianyi Chen^{1

2}, Yunqi Liu^{1

2}

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
² University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

PMID: 33599039
DOI: 10.1002/adma.202007741

Abstract

The preparation of large-area 2D conductive metal-organic framework (MOF) films remains highly desirable but challenging. Here, inspired by the capillary phenomenon, a face-to-face confinement growth method to grow conductive 2D Cu₂ (TCPP) (TCPP = meso-tetra(4-carboxyphenyl)porphine) MOF films on dielectric substrates is developed. Trace amounts of solutions containing low-concentration Cu²⁺ and TCPP are pumped cyclically into a micropore interface to produce this growth. The crystal structures are confirmed with various characterization techniques, which include high-resolution atomic force microscopy and cryogenic transmission electron microscopy (Cryo-TEM). The Cu₂ (TCPP) MOF film exhibit an electrical conductivity of ≈0.007 S cm^-1 , which is approximately four orders of magnitude higher than other carboxylic-acid-based MOF materials (10^-6 S cm^-1 ). Other wafer-scale conductive MOF films such as M₃ (HHTP)₂ (M = Cu, Co, and Ni; HHTP = 2,3,6,7,10,11-triphenylenehexol) can be produced utilizing this strategy and suggests this method has widescale applicability potential.

Keywords: 2D film; capillary force; face-to-face confinement growth; metal-organic frameworks; van der Waals heterojunction.

Abstract

Grants and funding