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Your search keyword '"Cánovas, Enrique"' showing total 2 results
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2 results on '"Cánovas, Enrique"'

1. Near IR bandgap semiconductive 2D conjugated metal-organic framework with rhombic lattice and high mobility

Author

Sporrer, Lukas, Zhou, Guojun, Wang, Mingchao, Balos, Vasileios, Revuelta, Sergio, Jastrzembski, Kamil, Loeffler, Markus, Petkov, Petko, Heine, Thomas, Kuc, Angieszka, Canovas, Enrique, Huang, Zhehao, Feng, Xinliang, and Dong, Renhao

Subjects
Condensed Matter - Materials Science
Abstract

Two-dimensional conjugated metal-organic frameworks (2D c-MOFs) are emerging as a unique class of 2D electronic materials. However, intrinsically semiconducting 2D c-MOFs with gaps in the Vis-NIR and high charge carrier mobility have been rare. Most of the reported semiconducting 2D c-MOFs are metallic (i.e. gapless), which limits their use in applications where larger band gaps are needed for logic devices. Herein, we design a new D2h-geometric ligand, 2,3,6,7,11,12,15,16-octahydroxyphenanthro(9,10b)triphenylene (OHPTP), and synthesize the first example of a 2D c-MOF single crystal (OHPTP-Cu) with a rhombohedral pore geometry after coordination with copper. The continuous rotation electron diffraction (cRED) analysis unveils the orthorhombic crystal structure at the atomic level with a unique AB layer stacking. The resultant Cu2(OHPTP) is a p-type semiconductor with an indirect band gap of about 0.50 eV and exhibits high electrical conductivity of 0.10 S cm-1 and high charge carrier mobility of 10.0 cm2V-1s-1. Density-functional theory calculations underline the predominant role of the out-of-plane charge transport in this semiquinone-based 2D c-MOFs., Comment: 11 pages 5 figures

Published
2024
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2. Benzenehexol‐Based 2D Conjugated Metal–Organic Frameworks with Kagome Lattice Exhibiting a Metallic State.

Author

Wang, Zhiyong, St. Petkov, Petko, Zhang, Jianjun, Liang, Baokun, Revuelta, Sergio, Xiao, Ke, Tiwari, Kajal, Guo, Quanquan, Li, Zichao, Zhang, Jichao, Qi, Haoyuan, Zhou, Shengqiang, Kaiser, Ute, Heine, Thomas, Cánovas, Enrique, Parkin, Stuart S. P., Feng, Xinliang, and Dong, Renhao

Abstract

2D conjugated metal–organic frameworks (2D c‐MOFs) are emerging as unique electroactive materials for electronics and spintronics. The structural design and discovery of Kagome‐type 2D c‐MOFs exhibiting a metallic state are of paramount significance, yet remain rarely explored. Here, the solution synthesis of benzenehexol‐based 2D c‐MOFs based is presented on the tetrahydroxy‐1,4‐quinone (THQ) ligand. This study shows that controlling the pH of the reaction system to ≈7.5 yields an energetically favorable nonporous Cu3(C6O6) with a Kagome lattice, while at a pH of ≈10, the known porous Cu3(C6O6)2 with a honeycomb lattice is obtained. The crystal structures of both Cu3(C6O6)2 and Cu3(C6O6) are resolved with near‐atomic precision (resolution, 1.8 Å) using an imaging technique. Unlike the p‐type semiconducting behavior of Cu3(C6O6)2, theoretical studies identify Cu3(C6O6) as a metal due to its unique structural topology. The metallic state of Cu3(C6O6) is experimentally validated by terahertz time‐domain spectroscopy (THz‐TDS), which shows an increase in conductivity upon cooling. Scattering‐type scanning near‐field optical microscopy (s‐SNOM) measurements further support these findings by revealing an increase in normalized reflectivity with decreasing temperature. This work provides a new avenue for tailoring the structural topology of 2D c‐MOFs to attain the Kagome lattice and metallic state. [ABSTRACT FROM AUTHOR]

Published
2024
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