圆二色性
印记(心理学)
材料科学
纳米颗粒
手性(物理)
化学物理
纳米技术
结晶学
化学
手征对称破缺
对称性破坏
物理
量子力学
Nambu–Jona Lasinio模型
生物化学
基因
作者
Nazifa Tabassum,Zheni N. Georgieva,Gouranga H. Debnath,David H. Waldeck
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2022-12-29
卷期号:15 (5): 2143-2151
被引量:8
摘要
Chiral metal halide perovskites have garnered substantial interest because of their promising properties for application in optoelectronics and spintronics. Understanding the mechanism of chiral imprinting is paramount for optimizing their utility. To elucidate the nature of the underlying chiral imprinting mechanism, we investigated how the circular dichroism (CD) intensity varies with nanoparticle size for quantum confined sizes of colloidal CsPbBr3 perovskite nanoparticles (NPs) capped by chiral β-methylphenethylammonium bromide ligands. We find that the CD intensity decreases strongly with increasing NP size, which, along with the shape of the CD spectra, points to electronic interactions between ligand and NP as the dominant mechanism of chiral imprinting in smaller NPs. We observe that as the NP size increases and crosses the quantum confinement threshold, the dominant mechanism of chirality transfer switches and is dominated by surfaces effects, e.g., structural distortions. These findings provide a benchmark for quantitative models of chiral imprinting.
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