3D printing colloidal crystal microstructures via sacrificial-scaffold-mediated two-photon lithography

Keliang Liu, Haibo Ding, Sen Li, Yanfang Niu, Yi Zeng, Junning Zhang, Xin Du () and Zhongze Gu ()
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Keliang Liu: Southeast University
Haibo Ding: Southeast University
Sen Li: Southeast University
Yanfang Niu: Southeast University
Yi Zeng: Southeast University
Junning Zhang: Southeast University
Xin Du: Southeast University
Zhongze Gu: Southeast University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The orderly arrangement of nanomaterials’ tiny units at the nanometer-scale accounts for a substantial part of their remarkable properties. Maintaining this orderness and meanwhile endowing the nanomaterials with highly precise and free-designed 3D micro architectures will open an exciting prospect for various novel applications. In this paper, we developed a sacrificial-scaffold-mediated two-photon lithography (TPL) strategy that enables the fabrication of complex 3D colloidal crystal microstructures with orderly-arranged nanoparticles inside. We show that, with the help of a degradable hydrogel scaffold, the disturbance effect of the femtosecond laser to the nanoparticle self-assembling could be overcome. Therefore, hydrogel-state and solid-state colloidal crystal microstructures with diverse compositions, free-designed geometries and variable structural colors could be easily fabricated. This enables the possibility to create novel colloidal crystal microsensing systems that have not been achieved before.

Date: 2022
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DOI: 10.1038/s41467-022-32317-w

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