Journal
CHEMISTRY OF MATERIALS
Volume 32, Issue 16, Pages 7036-7043Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c02459
Keywords
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Funding
- National Research Foundation (NRF) Grant - Korean Government [NRF-2017M3D1A1039553, NRF 2020M3H4A1A01086888]
- Research Projects of the KAISTKUSTAR
- TJ Park Science Fellowship of the POSCO TJ Park Foundation
- National Research Foundation of Korea [2020M3H4A1A01086888] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Hybrid organic/inorganic systems with modulated nanostructures and well-defined morphologies are of great importance to develop novel nanomaterials with tailored functionalities. Herein, we report the tunable assemblies of polystyrene-grafted Au nanoparticles (Au@PS NPs) within onion-like particles of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP), controlled by the molecular weight (M-n) of PS ligands. Coassembly of Au@PS and PS-b-P4VP through solvent-evaporative emulsions exhibits dramatic morphological changes in the NP assemblies depending on the M-n of PS ligands: (1) addition of low M-n (1.8 kg mol(-1)) Au@PS creates crusted onion-like hybrid particles with well-ordered hexagonal NP superlattices covering their surface; (2) in contrast, high M-n (6.4 kg mol(-1)) Au@PS segregate at PS domains of the block copolymer particles. Interestingly, these NPs form a hexagonal packing structure at the center of the PS domains, producing concentric lamellar particles with hierarchically stacked Au@PS in an alternate-layered onion-like structure. Finally, cryogenic electron microscopy analysis is conducted to probe the entropy-driven mechanism of the formation of these hybrid particles. These initial demonstrations of multicomponent hybrid particles with targeted spatial alignments offer new strategies to design complex nanomaterials with tailorable properties for potential technological applications.
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