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Monolithic digital patterning of polyimide by laser-induced pyrolytic jetting

Title
Monolithic digital patterning of polyimide by laser-induced pyrolytic jetting
Author
홍석준
Keywords
Laser-induced pyrolysis; Polyimide film; LIG; Micropatterning of polyimide; Polyimide microchannel
Issue Date
2021-06
Publisher
Elsevier B.V.
Citation
CHEMICAL ENGINEERING JOURNAL, v. 428, Article no. 131050, 8pp
Abstract
Based on its outstanding mechanical, thermal, and chemical properties, a Polyimide (PI) is useful in a wide range of applications. Its usage in biomedicine is drawing great attention owing to the recent confirmation of the biocompatibility of various PIs. However, the conventional patterning of a PI, based on photolithographic methods, which is expensive and time-consuming, hampers the rapid advancement of research-oriented fields that require frequent design changes. To resolve this problem, we introduce the method of the monolithic digital patterning of PI up to the quasi-three-dimensional (3D) structures at the microscale resolution by laser-induced jetting of highly porous Laser-induced graphene (LIG) from the PI matrix. Pyrolytic jetting of the LIG is dependent not only on the laser-induced temperature but also on its temporal and spatial gradients. However, the surfaces of the remaining PI can be exceptionally smooth at the optimum laser condition, comparable to the pristine surface at the microscopic level, as confirmed by Raman spectroscopy and Atomic force microscopy (AFM) measurements. On-demand microfluidic channels and multilevel imprinting molds are created in a single step using the proposed method as a proof-of-concept, substantiating its potential application in relevant research.
URI
https://www.sciencedirect.com/science/article/pii/S1385894721026322https://repository.hanyang.ac.kr/handle/20.500.11754/166561
ISSN
1385-8947
DOI
10.1016/j.cej.2021.131050
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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