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논문 리스트

2019
Two step lithography와 나노 실리카 코팅을 이용한 초발수 필름 제작 Fabrication of Superhydrophobic Surfaces with Uniform Structures
한국센서학회
이동원 외 1명
논문정보
Publisher
센서학회지
Issue Date
2019-07-31
Keywords
-
Citation
-
Source
-
Journal Title
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Volume
28
Number
4
Start Page
251
End Page
255
DOI
ISSN
12255475
Abstract
We propose a two-step lithography process to minimize edge-bead issues caused by thick photoresist (PR) coating. In the con- ventional PR process, the edge bead can be efficiently removed by applying an edge-bead removal (EBR) process while rotating thesilicon wafer at a high speed. However, applying conventional EBR to the production of desired PR mold with unique negative patternscannot be used because a lower rpm of spin coating and a lower temperature in the soft bake process are required. To overcome this problem, a two-step lithography process was developed in this study and applied to the fabrication of a polydimethylsiloxane (PDMS)film having super-hydrophobic characteristics. Following UV exposure with a first photomask, the exposed part of the silicon wafer wasselectively removed by applying a PR developer while rotating at a low rpm. Then, unique PR mold structures were prepared by employing an additional under-exposure process with a second mask, and the mold patterns were transferred to the PDMS. Resultsshowed that the fabricated PDMS film based on the two-step lithography process reduced the height difference from 23% to 5%. Inaddition, the water contact angle was greatly improved by spraying of hydrophobic nanosilica on the dual-scaled PDMS surface.

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이름 소속
이동원 기계공학부