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Plastic bending in a semiconducting coordination polymer crystal enabled by delamination.
Lian-Cai An1, Xiang Li2, Zhi-Gang Li1
1School of Materials Science and Engineering, Nankai University, 300350, Tianjin, China.
Nature Communications
|November 5, 2022
Summary
Researchers engineered plastic bending in semiconducting coordination polymers (CPs). This breakthrough stems from crystal delamination, enabled by unique bonding, paving the way for flexible electronics.
Area of Science:
- Materials Science
- Crystallography
- Mechanical Engineering
Background:
- Coordination polymers (CPs) are typically brittle due to strong directional bonding.
- This brittleness limits their application in flexible electronics and wearable devices.
- Engineering plasticity into CPs is crucial for advanced material applications.
Purpose of the Study:
- To investigate the mechanism of mechanical flexibility in coordination polymers.
- To demonstrate plastic bending in a semiconducting CP crystal.
- To provide insights for designing plastic CPs.
Main Methods:
- Synthesis and characterization of the semiconducting CP crystal, Cu-Trz (Trz = 1,2,3-triazolate).
- Mechanical testing to induce and analyze plastic bending.
- Spatially resolved analysis of short-range molecular forces.
Main Results:
- Demonstrated plastic bending in a Cu-Trz crystal.
- Identified crystal delamination along specific crystallographic directions as the bending mechanism.
- Revealed that the interplay of strong coordination bonds and weak supramolecular interactions (C-H···π, Cu···Cu) facilitates delamination.
Conclusions:
- The unique structural features, including molecular packing and diverse bonding interactions, enable mechanical flexibility and anisotropic responses in CPs.
- The delamination mechanism offers a versatile strategy for designing plasticity in CPs and other molecular crystals.
- This work opens new avenues for developing robust and flexible coordination polymer-based devices.
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