Surface Ligands as Permeation Barrier in the Growth and Assembly of Anisotropic Semiconductor Nanocrystals

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Because of the large surface-to-volume ratio of colloidal nanocrystals (NCs), surfactant molecules grafted at the NC surface play an important role in NC growth, interparticle interaction, processing, and application. For this reason, much progress has been made in understanding the surface chemistry of NCs along with the organic ligand shell, particularly in terms of grafted polar groups. However, most explanations of aliphatic counterparts are based on spherical NCs that usually have a dilute ligand layer. In anisotropic NCs such as nanorods and nanoplatelets, the linearly extended dimension results in a high-density aliphatic layer on the NC surface. Unlike spherical NCs, the compact organic shell could serve as a permeation membrane, effectively impeding a penetration of foreign molecules toward the NC surface. In this Perspective, we highlight the effects of ligand configuration on the properties of anisotropic NCs by exploring morphologies, assembled superstructures, and surface reaction of anisotropic NCs.
Publisher
AMER CHEMICAL SOC
Issue Date
2020-04
Language
English
Article Type
Article
Citation

JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.11, no.7, pp.2647 - 2657

ISSN
1948-7185
DOI
10.1021/acs.jpclett.9b03052
URI
http://hdl.handle.net/10203/274098
Appears in Collection
CBE-Journal Papers(저널논문)
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