Journal Article

IMPULSE-2025-00050

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Shape-tailored semiconductor dot-in-rods: optimizing CdS-shell growth for enhanced chiroptical properties via the rationalization of the role of temperature and time

Hao, J. ; Liu, P. ; Zhou, Z. ; Liu, H. ; Chen, W. ; Müller-Buschbaum, P.MLZ* ; Cheng, J. ; Wang, K. ; Sun, X. W. ; Delville, J.-P. (Corresponding author) ; Delville, M.-H. (Corresponding author)

2025
Royal Society of Chemistry Cambridge

Please use a persistent id in citations: doi:10.1039/D4NA01003E

Abstract: Colloidal chemistry provides an assortment of synthetic tools for tuning the shape of semiconductor nanocrystals. To fully exploit the shape- and structure-dependent properties of semiconductor nanorods, high-precision control on growth and design is essential. However, achieving this precision is highly challenging due to the high temperatures (>350 °C) and short reaction times (<8 minutes) often required for these reactions. In this study, we performed the first investigation on the impact of temperature and time on the CdS-shell growth of CdSe/CdS quantum rods. Our findings demonstrate that temperature plays a pivotal role in achieving ultra-thin shell dot-in-rods, which are crucial for enhancing chiroptical properties. The two-step process proposed here explains the shell growth of CdSe/CdS dot-in-rods (DRs). It involves finely-tuned isotropic shell growth in the first stage, followed by anisotropic length growth along the [0001] rod axis in the second step. This approach has two advantages: a systematic control of the shell thickness for different aspect ratios (ARs) and batch monodispersity. These DRs, with an ultra-thin CdS shell and a high AR, after modification with L/D cysteine molecules, exhibit significant enhancement of their ligand-induced chirality, with circular dichroism (CD) g-factor values as high as 10−3.

Keyword(s): Information and Communication (1st) ; Chemistry (2nd) ; Materials Science (2nd)

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Contributing Institute(s):

1. Heinz Maier-Leibnitz Zentrum (MLZ)
2. E13 (E13)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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