期刊
SMALL
卷 17, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202101337
关键词
3D‐ printing; donor– acceptor Stenhouse adducts; photochromism; thiol– ene reaction; two‐ photon polymerization
类别
资金
- Swiss National Science Foundation (SNSF) [200021_172609, PP00P2_172927]
- Marie-Curie postdoctoral fellowship [COFUND 267161]
- SNSF Spark grant [190345]
- ETH Zurich Career Seed grant [SEED21 18-2]
- Shenzhen Institute of Artificial Intelligence and Robotics for Society [2020-ICP002]
- Swiss National Science Foundation (SNF) [200021_172609] Funding Source: Swiss National Science Foundation (SNF)
This study presents the first photoresist for direct laser writing of photochromic 3D micro-objects via two-photon polymerization, enabling rapid processing of complex microstructures with excellent photoresponsiveness and reversible color-changing. The work provides a new approach for custom microfabrication of 3D photochromic objects with molecularly engineered color and responsiveness.
Molecular photoswitches that can reversibly change color upon irradiation are promising materials for applications in molecular actuation and photoresponsive materials. However, the fabrication of photochromic devices is limited to conventional approaches such as mold casting and spin-coating, which cannot fabricate complex structures. Reported here is the first photoresist for direct laser writing of photochromic 3D micro-objects via two-photon polymerization. The integration of photochromism into thiol-ene photo-clickable resins enables rapid two-photon laser processing of highly complex microstructures and facile postmodification using a series of donor-acceptor Stenhouse adduct (DASA) photoswitches with different excitation wavelengths. The versatility of thiol-ene photo-click reactions allows fine-tuning of the network structure and physical properties as well as the type and concentration of DASA. When exposed to visible light, these microstructures exhibit excellent photoresponsiveness and undergo reversible color-changing via photoisomerization. It is demonstrated that the fluorescence variations of DASAs can be used as a reporter of photoswitching and thermal recovery, allowing the reading of DASA-containing sub-micrometric structures in 3D. This work delivers a new approach for custom microfabrication of 3D photochromic objects with molecularly engineered color and responsiveness.
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