Abstract
Discovering new methods and principles in the inequivalent growth of equivalent facets is of great significance for going beyond symmetrical nanocrystals and for out-of-box exploration. In this work, we demonstrate that a middle ground exists between the traditional weak ligands and the strong ligands with unusual growth modes. By modifying the seed concentration during the growth of pentagonal Au nanorods, the typical weak ligand cetyltrimethylammonium bromide (CTAB) is made strong, leading to notches of restricted growth and even the active surface growth mode. In-depth investigation in the link between growth kinetics and ligand packing reveals the principle of their interplay—that the on-off dynamics of the ligands only allows for a certain limit of materials deposition rate. Beyond this limit, the growth materials build up and are then diverted elsewhere, leading to inequivalent growth. The fact that a freshly grown surface has few ligands promotes the active surface growth, focusing the growth materials onto a few sites. We believe that the knowhow of interfering ligand packing via growth kinetics would offer a powerful tool of synthetic control, where the facet- and curvature-dependent ligand packing is expected to be useful synthetic handles.
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20 September 2022
An Erratum to this paper has been published: https://doi.org/10.1007/s11426-022-1393-1
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21703104, 21673117, 91956109), Jiangsu Provincial Foundation for Specially-Appointed Professor, Jiangsu Science and Technology Plan (BK20211258), Fellowship of China Postdoctoral Science Foundation (2019M661810), Nanjing Tech University (39837102, 39837131, 39837140), and SICAM Fellowship from Jiangsu National Synergetic Innovation Centre for Advanced Materials.
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The online version of the original article can be found at https://doi.org/10.1007/s11426-022-1393-1
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Zheng, Y., Zong, J., Xiang, T. et al. Turning weak into strong: on the CTAB-induced active surface growth. Sci. China Chem. 65, 1299–1305 (2022). https://doi.org/10.1007/s11426-022-1253-7
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DOI: https://doi.org/10.1007/s11426-022-1253-7