Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 44, Pages 50033-50038Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c13482
Keywords
silk fibroin; direct laser printing; microprinting; femtosecond laser; LIFT; luminescence; rare earth; lanthanides beta-diketonate complex
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao de Amparo a Ciencia e Tecnologia do Estado de Sao Paulo (FAPESP) [2018/11283-7]
- FAPESP [2016/11591-8]
- Fundacao de Amparo a`Pesquisa do Estado do Rio de Janeiro (FAPERJ) [E-26/202.821/2019]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [18/11283-7] Funding Source: FAPESP
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Fabrication of functional silk fibroin microstructures has extensive applications in biotechnology and photonics. Considerable progress has been made based on lithographic methods and self-assembly approaches. However, most methods require chemical modification of silk fibroin, which restricts the functionalities of the designed materials. At the same time, femtosecond laser-induced forward transfer (fs-LIFT) has been explored as a simple and attractive processing tool for microprinting of high-resolution structures. In this paper, we propose the use of LIFT with fs-pulses for creating high-resolution structures of regenerated silk fibroin (SF). Furthermore, upon adding Eu3+/Tb3+ complexes to SF, we have been able to demonstrate the printing by LIFT of luminescent SF structures with a resolution on the order of 2 mu m and without material degradation. This approach provides a facile method for printing well-defined two-dimensional (2D) micropatterns of pure and functionalized SF, which can be used in a wide range of optical and biomedical applications.
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