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Chirality-Induced Spin Selectivity in Supramolecular Chirally Functionalized Graphene.
Seyedamin Firouzeh1, Sara Illescas-Lopez2, Md Anik Hossain1
1Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
ACS Nano
|September 5, 2023
Summary
Researchers explored chirality induced spin selectivity (CISS) in graphene. Functionalizing reduced graphene oxide with chiral fibers created CISS effects, demonstrating a new method for chiral conductive materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Organic Chemistry
Background:
- Chiral graphene hybrid materials are vital for applications like catalysis and sensing.
- Chirality-induced spin selectivity (CISS) is a spin-filtering phenomenon observed in chiral materials.
- CISS properties of graphene-based materials remain largely unexplored due to graphene's weak spin-orbit interaction.
Purpose of the Study:
- To investigate the CISS effect in functionalized graphene materials.
- To determine if graphene can exhibit CISS properties.
- To develop a simple method for inducing chirality and CISS in conductive materials.
Main Methods:
- Noncovalent functionalization of reduced graphene oxide (rGO) with chiral Fmoc-FF supramolecular fibers.
- Characterization of the resulting chiral graphene sheets.
- Measurement of the CISS effect in the functionalized graphene.
Main Results:
- Demonstrated the CISS effect in graphene sheets functionalized with chiral Fmoc-FF fibers.
- Observed that the CISS signal correlates with the supramolecular chirality of the functionalizing agent.
- Found that the graphene thickness influences the CISS signal.
- Established that conformational chirality is induced in graphene post-functionalization.
Conclusions:
- Chiral functionalization can successfully induce CISS properties in graphene-based materials.
- Noncovalent supramolecular functionalization offers a versatile approach to impart chirality and CISS to various conductive materials.
- This work opens avenues for novel chiral electronic devices based on graphene.
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