Induction of Chirality in Atomically Thin ZnSe and CdSe Nanoplatelets: Strengthening of Circular Dichroism via Different Coordination of Cysteine-Based Ligands on an Ultimate Thin Semiconductor Core
Daria A. Kurtina,
Valeria P. Grafova,
Irina S. Vasil’eva,
Sergey V. Maksimov,
Vladimir B. Zaytsev,
Roman B. Vasiliev
Affiliations
Daria A. Kurtina
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Valeria P. Grafova
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Irina S. Vasil’eva
A. N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave. 33, Bld. 2, 119071 Moscow, Russia
Sergey V. Maksimov
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Vladimir B. Zaytsev
Department of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia
Roman B. Vasiliev
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Chiral nanostructures exhibiting different absorption of right- and left-handed circularly polarized light are of rapidly growing interest due to their potential applications in various fields. Here, we have studied the induction of chirality in atomically thin (0.6–1.2 nm thick) ZnSe and CdSe nanoplatelets grown by a colloidal method and coated with L-cysteine and N-acetyl-L-cysteine ligands. We conducted an analysis of the optical and chiroptical properties of atomically thin ZnSe and CdSe nanoplatelets, which was supplemented by a detailed analysis of the composition and coordination of ligands. Different signs of circular dichroism were shown for L-cysteine and N-acetyl-L-cysteine ligands, confirmed by different coordination of these ligands on the basal planes of nanoplatelets. A maximum value of the dissymmetry factor of (2–3) × 10−3 was found for N-acetyl-L-cysteine ligand in the case of the thinnest nanoplatelets.
