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  Fabrication of freestanding Pt nanowires for use as thermal anemometry probes in turbulence measurements

Le-The, H., Küchler, C., van den Berg, A., Bodenschatz, E., Lohse, D., & Krug, D. (2021). Fabrication of freestanding Pt nanowires for use as thermal anemometry probes in turbulence measurements. Microsystems & Nanoengineering, 7: 28. doi:10.1038/s41378-021-00255-0.

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 Creators:
Le-The, Hai, Author
Küchler, Christian1, Author              
van den Berg, Albert, Author
Bodenschatz, Eberhard1, Author              
Lohse, Detlef, Author              
Krug, Dominik, Author
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1Laboratory for Fluid Physics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063287              

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 Abstract: We report a robust fabrication method for patterning freestanding Pt nanowires for use as thermal anemometry probes for small-scale turbulence measurements. Using e-beam lithography, high aspect ratio Pt nanowires (~300 nm width, ~70 µm length, ~100 nm thickness) were patterned on the surface of oxidized silicon (Si) wafers. Combining wet etching processes with dry etching processes, these Pt nanowires were successfully released, rendering them freestanding between two silicon dioxide (SiO2) beams supported on Si cantilevers. Moreover, the unique design of the bridge holding the device allowed gentle release of the device without damaging the Pt nanowires. The total fabrication time was minimized by restricting the use of e-beam lithography to the patterning of the Pt nanowires, while standard photolithography was employed for other parts of the devices. We demonstrate that the fabricated sensors are suitable for turbulence measurements when operated in constant-current mode. A robust calibration between the output voltage and the fluid velocity was established over the velocity range from 0.5 to 5 m s−1 in a SF6 atmosphere at a pressure of 2 bar and a temperature of 21 °C. The sensing signal from the nanowires showed negligible drift over a period of several hours. Moreover, we confirmed that the nanowires can withstand high dynamic pressures by testing them in air at room temperature for velocities up to 55 m s−1.

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Language(s): eng - English
 Dates: 2021-04-022021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41378-021-00255-0
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Title: Microsystems & Nanoengineering
Source Genre: Journal
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Pages: - Volume / Issue: 7 Sequence Number: 28 Start / End Page: - Identifier: ISSN: 2055-7434