Publication date: 8th July 2026
Nanoclusters are reaction intermediates between molecular precursors and colloidal quantum dots (CQDs). Unlike well-defined organic synthesis intermediates, their structures and properties remain elusive, leaving CQD synthesis largely empirical. Here, we investigate the structural and thermal properties of indium arsenide (InAs) nanoclusters and elucidate their role as precursors in CQD formation. X-ray scattering and absorption spectroscopy reveal differences in structural ordering and coordination among InAs nanoclusters. These nanoclusters also exhibit differences in thermal stability, which affect their monomer supply rates during CQD formation. [1] Furthermore, we employ a machine-learning–derived UV spectral mapping strategy to understand complex reaction pathways in InAs CQDs. It visualizes how reaction pathways of nanoclusters diverge and convert into CQDs depending on chemical additives. Additionally, we discovered that these early-stage reaction pathways affect the concentration and size of InAs CQDs. [2] This work provides mechanistic insights into CQD formation pathways and unveils the structural/chemical characteristics of nanoclusters.
RS-2026-25501632, RS-2022-NF000854, RS-2024-00461815, RS-2022-NR070449, RS-2022-NR068167
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