High-aspect ratio microfabrication of crosslinked polytetra-fluoroethylene using synchrotron radiation direct photo-etching

Takanori Katoh*, Yasunori Sato, Daichi Yamaguchi, Shigetoshi Ikeda, Yasushi Aoki, Akihiro Oshima, Masakazu Washio, Yoneho Tabata

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


High-aspect ratio micro-fabrication of crosslinked polytetrafluoroethylene (PTFE) has been carried out using synchrotron radiation (SR) direct photo-etching. The etching rates of crosslinked PFTE samples with various crosslinked densities were studied by changing photon fluence of SR at different sample temperatures. The maximum etching rate of 150 micron/min was achieved at SR beam current of 600 mA. The etching rate of the sample with higher crosslinking density resulted in a higher etching rate. This rate was about two times higher than that of non-crosslinked PTFE. The effects of molecular motion and fragmentation of the molecules on etching process were discussed from temperature dependence on etching rate. Furthermore, we have found that surface modification of non-crosslinked PTFE had been proceeding during irradiation of SR to the surfaces at 140 °C. The modified surfaces were examined on behavior of crystallites by differential scanning calorimetry, and on chemical structure by FTIR spectroscopy and solid-state 19F NMR spectroscopy. The results showed that properties of modified layers have dependence on depth. Crosslinking reaction would be induced by SR irradiation even in its solid state within about 50 μm from the surface.

Original languageEnglish
Pages (from-to)493-500
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
EventMicromachining and Microfarication Process Technology VIII - San Jose, CA, United States
Duration: 2003 Jan 272003 Jan 29


  • Crosslinking
  • Direct etching
  • High-aspect ratio
  • MEMS
  • Microfabrication
  • PTFE
  • Synchrotron radiation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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