Chirality in Atomically Thin CdSe Nanoplatelets Capped with Thiol-Free Amino Acid Ligands: Circular Dichroism Vs. Carboxylate Group Coordination

Overview

Journal Materials (Basel)

Publisher MDPI

Date 2024 Jan 11

PMID 38204090

Authors

Daria A Kurtina

Vladimir B Zaytsev

Roman B Vasiliev

Affiliations

Soon will be listed here.

Abstract

Chiral semiconductor nanostructures and nanoparticles are promising materials for applications in biological sensing, enantioselective separation, photonics, and spin-polarized devices. Here, we studied the induction of chirality in atomically thin only two-monolayer-thick CdSe nanoplatelets (NPLs) grown using a colloidal method and exchanged with L-alanine and L-phenylalanine as model thiol-free chiral ligands. We have developed a novel two-step approach to completely exchange the native oleic acid ligands for chiral amino acids at the basal planes of NPLs. We performed an analysis of the optical and chiroptical properties of the chiral CdSe nanoplatelets with amino acids, which was supplemented by an analysis of the composition and coordination of ligands. After the exchange, the nanoplatelets retained heavy-hole, light-hole, and spin-orbit split-off exciton absorbance and bright heavy-hole exciton luminescence. Capping with thiol-free enantiomer amino acid ligands induced the pronounced chirality of excitons in the nanoplatelets, as proven by circular dichroism spectroscopy, with a high dissymmetry g-factor of up to 3.4 × 10 achieved for heavy-hole excitons in the case of L-phenylalanine.

Citing Articles

Menthol-Induced Chirality in Semiconductor Nanostructures: Chiroptical Properties of Atomically Thin 2D CdSe Nanoplatelets Capped with Enantiomeric L-(-)/D-(+)-Menthyl Thioglycolates.

Skrypnik M, Kurtina D, Karamysheva S, Stepanidenko E, Vasileva I, Chang S Nanomaterials (Basel). 2024; 14(23).

PMID: 39683309 PMC: 11643598. DOI: 10.3390/nano14231921.

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