Light-Active, Reversibly Shape-Shifting Block Copolymer Particles using Photo-Switchable Au Nanoparticle Surfactants

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Dynamic particles with switchable shapes in response to light have attracted great interest to develop programmable smart materials with superior spatial and temporal resolution. Herein, a facile strategy for light-responsive, shape-changing block copolymer (BCP) particles is developed. Key to this strategy is the design of azobenzene-grafted Au nanoparticles (Au@ Azo NPs) as photoswitchable surfactants through photoisomerization of Azo ligands. Under visible light, onion-like polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) BCP particles with PS outer layer form due to the nonpolar nature of trans-Azo ligands, whereas the isomerization to polar cis-Azo surfactants with UV irradiation transforms these spheres into ellipsoids with both PS and P2VP exposed on their surfaces. This light-driven shape change is robust and reversible over multiple irradiation cycles. The reversible shape evolution between spherical and ellipsoidal BCP particles induced by photoactive Au@Azo NP surfactants is elucidated using a cryogenic electron microscope. Furthermore, light-dependent fluorescence and shape of the BCP particles are successfully demonstrated, enabling the visualization of particle shape into an optical signal.
Publisher
AMER CHEMICAL SOC
Issue Date
2021-12
Language
English
Article Type
Article
Citation

CHEMISTRY OF MATERIALS, v.33, no.24, pp.9769 - 9779

ISSN
0897-4756
DOI
10.1021/acs.chemmater.1c03684
URI
http://hdl.handle.net/10203/291797
Appears in Collection
CBE-Journal Papers(저널논문)
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