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Fabrication of DLC-Based Micro-Gear Patterns by Room-Temperature Curing Nanoimprint Lithography Using Glass-Like Carbon Molds

Published online by Cambridge University Press:  15 January 2013

Shuji Kiyohara
Affiliation:
Electric and Control System Engineering Course, Faculty of Advanced Engineering, Maizuru National College of Technology, 234 Aza Shiroya, Maizuru, Kyoto 625-8511, Japan
Tomu Ikegaki
Affiliation:
Electric and Control System Engineering Course, Faculty of Advanced Engineering, Maizuru National College of Technology, 234 Aza Shiroya, Maizuru, Kyoto 625-8511, Japan
Chigaya Ito
Affiliation:
Electric and Control System Engineering Course, Faculty of Advanced Engineering, Maizuru National College of Technology, 234 Aza Shiroya, Maizuru, Kyoto 625-8511, Japan
Ippei Ishikawa
Affiliation:
Electric and Control System Engineering Course, Faculty of Advanced Engineering, Maizuru National College of Technology, 234 Aza Shiroya, Maizuru, Kyoto 625-8511, Japan
Hideto Tanoue
Affiliation:
Department of Electrical and Electronic Information Engineering, Toyohashi University of, Technology, 1-1 Hibarigaoka Tenpaku, Toyohashi, Aichi 441-8580, Japan
Hirofumi Takikawa
Affiliation:
Department of Electrical and Electronic Information Engineering, Toyohashi University of, Technology, 1-1 Hibarigaoka Tenpaku, Toyohashi, Aichi 441-8580, Japan
Yoshio Taguchi
Affiliation:
Application and Technical Section, ELIONIX INC., 3-7-6 Motoyokoyama, Hachioji, Tokyo, 192-0063, Japan
Yoshinari Sugiyama
Affiliation:
Application and Technical Section, ELIONIX INC., 3-7-6 Motoyokoyama, Hachioji, Tokyo, 192-0063, Japan
Yukiko Omata
Affiliation:
Application and Technical Section, ELIONIX INC., 3-7-6 Motoyokoyama, Hachioji, Tokyo, 192-0063, Japan
Yuichi Kurashima
Affiliation:
Research Center for Ubiquitous MEMS and Micro Engineering, AIST, 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan
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Abstract

The fabrication of diamond-like carbon (DLC) micro-gear by room temperature curing nanoimprint lithography (RTC-NIL) using glass-like carbon (GC) molds as applications to the DLC-based medical MEMS (Micro Electronic Mechanical Systems) was investigated. The DLC film which has excellent properties similar to chemical vapor deposited (CVD) diamond films was used as the patterning material. We propose GC as mold material because GC has higher etching selectivity than a diamond film. The etching selectivity of polysiloxane film against a GC substrate is about 5 times as high as that of a diamond film. Therefore we fabricated the GC molds that have micro-gear patterns with 30 µm-tip diameter and 500 nm-tooth thickness. We carried out the RTC-NIL process using the GC micro-gear molds under the following optimum conditions. 1 min-time from spin-coating to imprint: t 1 , 0.5 MPa-imprinting pressure: P and 5 min-holding time: t 2 , and then the imprinted polysiloxane pattern on DLC film was processed with an electron cyclotron resonance (ECR) oxygen ion shower. However, we were not able to fabricate micro-gear patterns in high accuracy because of a remaining residual layer on the DLC film. Therefore we propose the removing process for the residual layer with trifluoromethane (CHF3) ion shower under the optimum conditions of 300 eV-ion energy and 4 min-etching time. As a result, we succeeded to fabricate concave DLC-based micro-gear patterns in high accuracy which has 30 µm-tip diameter and 1 µm-depth.

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Articles
Copyright
Copyright © Materials Research Society 2013

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References

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Fabrication of DLC-Based Micro-Gear Patterns by Room-Temperature Curing Nanoimprint Lithography Using Glass-Like Carbon Molds
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