Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.320
Publication date: 18th July 2019
Nanoscale semiconductor materials shaped as urchins and flowers (termed, nanourchins and nanoflowers, respectively) stimulated extensive attention in recent years owing to their branched 3D structure with a large surface-to-volume ratio, thus demonstrating practical applications in catalysis, chemical sensors and various optoelectronic devices. Nanourchins and nanoflowers based on In2S3 semiconductors are of a special interest, due to their low toxicity, activity in the UV-Vis spectral regime, high carrier mobility and unique morphologies. In this study, we explore colloidal growth of β-In2S3 nanourchins and nanoflowers occurring from single-nanodots which over the growth period are self-assembled into branched 3D structures, where shape control is dictated by the synthesis conditions. The current work is an innovative study that describes in detail the growth mechanism that leads to specific structures and surface properties. Advanced electron microscopy methods revealed an elemental distribution across a nanourchin and displayed a dense core with In2S3 composition, surrounded by a shell consisting of In-rich spikes protruding from the core surface. The nanourchins undergo transformation into nanoflowers after altering reaction conditions, involving re-organization of the atoms' positions and formation of a hollow core/shell structure with In2S3/InS composition. Eventually, the nanoflowers decompose into nanoplatelet shapes. The use of specific organic ligands was observed to dictate the formation of the 3D clusters. The proposed formation mechanisms for each nanostructure were corroborated by thermodynamic considerations.
The authors acknowledge the financial support from the Israel Council for Higher–Focal Area Technology (No. 872967), the Volkswagen Stiftung (No.88116), the Israel Science Foundation (No.914/15), the Israel Science Foundation Bikura Program (No.1508/14) and the Neubauer Family Foundation.
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