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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
Published on: April 9, 2018
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Metallic Conductivity in a Two-Dimensional Cobalt Dithiolene Metal-Organic Framework
Andrew J Clough1, Jonathan M Skelton2, Courtney A Downes1
1Department of Chemistry, University of Southern California (USC) , Los Angeles, California 90089, United States.
Journal of the American Chemical Society
|July 14, 2017
Summary
This study reveals the first metal-organic framework (MOF) exhibiting metallic conductivity. Temperature-dependent studies show a unique transition from semiconducting to metallic behavior in 2D MOFs.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) metal-organic frameworks (MOFs) are recognized for their potential in electronic applications due to favorable charge transport properties.
- Research has focused on enhancing charge carrier mobility and reducing resistivity in 2D MOFs.
Purpose of the Study:
- To investigate the temperature-dependent charge transport properties of a specific 2D cobalt-based MOF.
- To explore the transition from semiconducting to metallic phases in this novel MOF material.
Main Methods:
- Variable temperature resistivity measurements were conducted on thin films of the 2D cobalt 2,3,6,7,10,11-triphenylenehexathiolate framework.
- Density functional theory (DFT) calculations were employed to analyze the electronic structure and understand the observed conductivity.
Main Results:
- A transition from semiconducting to metallic behavior was observed as temperature decreased, a phenomenon not previously seen in MOFs.
- This transition was found to be sensitive to film thickness and the presence of solvent molecules within the MOF pores.
- DFT calculations supported the complex metallic conductivity observed in the material.
Conclusions:
- The study reports the first experimental observation of band-like metallic conductivity in a metal-organic framework.
- This finding opens new avenues for designing MOFs with tunable electronic properties for advanced applications.
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