Stiff Shape Memory Polymers for High-Resolution Reconfigurable Nanophotonics.
Nano Lett
; 22(22): 8917-8924, 2022 11 23.
Article
em En
| MEDLINE
| ID: mdl-36354246
ABSTRACT
Reconfigurable metamaterials require constituent nanostructures to demonstrate switching of shapes with external stimuli. Yet, a longstanding challenge is in overcoming stiction caused by van der Waals forces in the deformed configuration, which impedes shape recovery. Here, we introduce stiff shape memory polymers. This designer material has a storage modulus of â¼5.2 GPa at room temperature and â¼90 MPa in the rubbery state at 150 °C, 1 order of magnitude higher than those in previous reports. Nanopillars with diameters of â¼400 nm and an aspect ratio as high as â¼10 were printed by two-photon lithography. Experimentally, we observe shape recovery as collapsed and touching structures overcome stiction to stand back up. We develop a theoretical model to explain the recoverability of these sub-micrometer structures. Reconfigurable structural color prints with a resolution of 21150 dots per inch and holograms are demonstrated, indicating potential applications of the stiff shape memory polymers in high-resolution reconfigurable nanophotonics.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nanoestruturas
/
Materiais Inteligentes
Idioma:
En
Revista:
Nano Lett
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Singapura