Issue 9, 2023

Chiral amplification induced by self-assembly of different aggregation states in liquid crystal block copolymer films with chiral response

Abstract

Chiral films with a high optical asymmetry show substantial potential in organic optoelectronics and other chiroptical fields. However, the fabrication of chiral films with high circular dichroism and chiral response remains challenging. Herein, hierarchical nanostructures with controllable optical asymmetry and chiral response were formed in a liquid crystalline block copolymer film (LC-BCP) induced by the enantiomers dibenzoyl tartaric acid (DiBTA) or dibenzyl ester tartaric acid (DiBETA). A high chiral amplification was achieved with an asymmetry factor (gabs) of up to 0.079 when DiBTA was used, which was 10-fold larger than when DiBETA was used. The difference in gabs was verified by the different stacking modes between the exogenous chiral molecules and LC-BCP. Specifically, DiBTA caused a J-aggregation self-assembly, while DiBETA resulted in an H-aggregation self-assembly. Additionally, the obtained chiral films presented an excellent chiral response to photo and thermal stimuli, allowing the chiral switch rapidly and reversibly. This study provides a pathway to the design of chiral film materials with high optical activity and stimuli response for potential applications in diverse fields such as chiral recognition, storage, metamaterials, and so on.

Graphical abstract: Chiral amplification induced by self-assembly of different aggregation states in liquid crystal block copolymer films with chiral response

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
03 Marts 2023
Accepted
13 Apr. 2023
First published
14 Apr. 2023
This article is Open Access
Creative Commons BY license

Mater. Adv., 2023,4, 2185-2191

Chiral amplification induced by self-assembly of different aggregation states in liquid crystal block copolymer films with chiral response

J. Yuan, X. Lu, X. He, F. Zheng and Q. Lu, Mater. Adv., 2023, 4, 2185 DOI: 10.1039/D3MA00103B

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