期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 13, 页码 8849-8858出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01951
关键词
microlens; polymer phase separation; supercritical carbon dioxide; variable focal length; microlens array
资金
- National Natural Science Foundation of China [51373197, 21422407, 20876169]
Microlenses are highly sought as reliable means for high resolution optical imaging at low illumination intensities. Plano-convex configuration with tunable dimension and curvature is an essential feature in the microlens fabrication. In this study, we present a facile and green route for preparing well-defined microlenses based on polymer phase separation in the presence of supercritical carbon dioxide (scCO(2)). The behaviors of linear polymethylmethacrylate protruded from cross-linked silicone network in scCO(2) environment are investigated from the perspectives of thermodynamics and kinetics. Microlenses with dimensions from 2 to 15 mu m and contact angles from 55 degrees to 112 degrees are successfully obtained through the adjustment of the kinetic conditions and outgassing rate. With the tunable focal length, they exhibit intrinsic function of discerning submicroscale patterns that are unable to be observed directly under optical microscope. Moreover, size confinement on the substrate results in the generation of well-ordered microlens arrays, affording great promise for applications in bioimaging, photolithography, light harvesting, and optical nanosensing.
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