Mechanical and Optical Properties of Nanocluster-Silica Metamaterials.
basic_science · Level V
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- Record sourced from PubMed, PMID 41580939.
- Also identified by DOI 10.1002/adma.202521526.
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Abstract
Nanostructured metamaterials with complex 3D geometries can be fabricated using two-photon lithography but are typically limited to specific materials by the available photoresists. Here, we develop a two-photon lithography photoresist for fabricating mechanically robust and optically active metamaterials. This photoresist consists of silver nanocluster photointiators in a polyhedral oligomeric silsequioxane (POSS) polymer matrix. Printed nanocomposites show a 216% increase in elastic modulus and 166% increase in energy absorption compared to structures made of POSS, while retaining 96% elastic recovery. Nanocomposite gyroid nanolattices reach 80% strain at failure. The nanolattice energy absorption is among the highest for lightweight nanoporous materials. Thermal annealing is used to convert the printed nanocomposites to nanoparticle-embedded glass with 54% higher energy absorption than fused silica. The annealed gyroid nanolattices contain silver nanoparticles and exhibit plasmonic activity. Right and left-handed chiral nanolattices result in different transmission spectra under linearly polarized light.