2021 Fiscal Year Research-status Report
Elucidating the effect of boundary curvature on the wrinkling of thin suspended films by theory and experiment
| Project/Area Number |
21K03782
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
JANSSENS Stoffel 沖縄科学技術大学院大学, 力学と材料科学ユニット, スタッフサイエンティスト (00817629)
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| Co-Investigator(Kenkyū-buntansha) |
フリード エリオット 沖縄科学技術大学院大学, 力学と材料科学ユニット, 教授 (70735761)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | diamond / laser / wrinkling / glass / etching |
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| Outline of Annual Research Achievements |
The following goals were achieved:
(1) Depositing a nanocrystalline diamond (NCD) film (200 nm thick) on a glass substrate with chemical vapor deposition at a temperature of approximately 500 °C and pressure of roughly 1/20 atmospheric pressure. (2) Measuring the prestrain that leads to film wrinkling induced by a thermal mismatch between the diamond and the glass with X-ray diffraction and a technique developed by Janssens. (3) Microfabrication of diamond film disks with femtosecond laser ablation. (4) Etching glass substrates with hydrofluoric acid using a polytetrafluoroethylene chemical reactor. (5) Etching on the diamond side of the glass substrate with a buffered oxide etchant in a polytetrafluoroethylene chemical reaction. The glass under the diamond disk was etched to form the annular suspended film with a boundary of negative curvature. (6) In addition to our goals, NCD film growth simulations were performed to ensure that the deposited films have a morphology that suits this work. (7) We accidentally discovered how to fabricate diamond-glass nanochannels with a height of roughly 60 nm and a width of approximately 2 micrometers. We found that we locally can delaminate NCD film from the glass substrate with the femtosecond laser. We are planning to patent this work.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
All goals were achieved, and in addition to the goals we:
- I accidentally discovered how to fabricate diamond-glass nanochannels, which we plan to patent.
- NCD film growth simulations were performed to ensure that the deposited films have a morphology that suits this work. These results were published.
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| Strategy for Future Research Activity |
A systematic set of suspended nanocrystalline diamond films, only differing in boundary curvature, will be made to verify the generality of our recently derived relation. This will be done by fabricating systematic sets of suspended nanocrystalline diamond films of similar prestrain and only differ in thickness. Finally, the preparation of manuscripts for international journals will be done. We are also preparing theoretical work that can predict our experimental findings.
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| Causes of Carryover |
A small amount of the grant was not used. This part will be used for buying stationary.
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