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Open AccessArticle

Al2O3 and Pt Atomic Layer Deposition for Surface Modification of NiTi Shape Memory Films

1
Institute of Physics of the ASCR, Na Slovance 2, 18221 Prague, Czech Republic
2
Department of Biomedical Engineering, Chung Yuan Christian University, 200 Chung Pei Road, Chung Li District, Taoyuan City 32023, Taiwan
3
Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu 30076, Taiwan
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(8), 746; https://doi.org/10.3390/coatings10080746
Received: 7 July 2020 / Revised: 27 July 2020 / Accepted: 28 July 2020 / Published: 30 July 2020
(This article belongs to the Section Surface Characterization, Deposition and Modification)
Pt coatings on NiTi film micro-actuators and/or sensors can add some useful properties, e.g., they may improve the NiTi anticorrosion and thermomechanical characteristics or activate surface properties beneficial for a specific application (e.g., functionalized surfaces for biomedical applications). Pt coatings prepared via atomic layer deposition (ALD) may help reduce cost due to the nanometric thickness. However, no authors have reported preparation of Pt ALD coatings on NiTi films, perhaps due to the challenge of the concurrent NiTi film oxidation during the Pt ALD process. In the present study, Al2O3 and Pt ALD coatings were applied to NiTi thin films. The ALD coating properties were studied using electron and atomic force microscopies and X-ray photoelectron spectroscopy (XPS). Potential structural changes of NiTi due to the ALD process were evaluated using electron microscopy and X-ray diffraction. The presented ALD process resulted in well-controllable preparation of Pt nanoparticles on ultrathin Al2O3 seed layer and a change of the transformation temperatures of the NiTi films. View Full-Text
Keywords: NiTi alloy; atomic layer deposition; thin film; Pt nanoparticles NiTi alloy; atomic layer deposition; thin film; Pt nanoparticles
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MDPI and ACS Style

Vokoun, D.; Klimša, L.; Vetushka, A.; Duchoň, J.; Racek, J.; Drahokoupil, J.; Kopeček, J.; Yu, Y.-S.; Koothan, N.; Kei, C.-C. Al2O3 and Pt Atomic Layer Deposition for Surface Modification of NiTi Shape Memory Films. Coatings 2020, 10, 746.

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