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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Robust Chemiresistive Behavior in Conductive Polymer/MOF Composites.

Heejung Roh^1,2, Dong-Ha Kim², Yeongsu Cho^2,3

¹Massachusetts Institute of Technology, Department of Materials Science & Engineering, 77 Massachusetts Ave, Cambridge, MA, 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)

|April 18, 2024

Summary

Hybridizing conductive metal-organic frameworks (MOFs) with conductive polymers (cPs) enhances gas sensor recovery and stability. This strategy improves sensor performance at room temperature, enabling long-term response retention for electronic applications.

Keywords:

chemiresistors composites conjugated polymers metal‐organic frameworks

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Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Conductive metal-organic frameworks (cMOFs) show promise for gas sensing.
Current MOF-based sensors often suffer from limited reusability and slow recovery.
Hybridization offers a potential solution to overcome these limitations.

Purpose of the Study:

To develop high-performing, reusable gas sensors using a hybrid approach.
To investigate the synergistic effects of combining cMOFs and conductive polymers (cPs).
To elucidate the mechanism behind improved sensor performance.

Main Methods:

Fabrication of chemiresistor devices using hybridized cMOF/cP materials.
Systematic study of cMOFs with HHTP and HITP ligands and various metal nodes (Co, Cu, Ni).
Analysis of sensor recovery kinetics, cycling stability, and dynamic range at room temperature.
Mechanistic investigation using energy band alignment, sensing thermodynamics, and density functional theory (DFT) calculations.

Main Results:

Hybridization significantly improves sensor recovery kinetics, cycling stability, and dynamic range at room temperature.
Hole enrichment in the cMOF component enhances desorption kinetics, leading to better recovery and long-term response retention.
DFT calculations support the proposed mechanism of enhanced sorbate-analyte interactions.
Facile thin-film co-processing and device integration are achieved through alloying cPs and cMOFs.

Conclusions:

Hybridizing cMOFs with cPs creates effective mixed ionic-electronic conductors for advanced gas sensors.
The developed materials exhibit superior performance, including rapid recovery and stability at room temperature.
This hybridization strategy offers a pathway for utilizing MOF-based materials in diverse electronic applications.