Publications
From Academia to Government and Private Industry
TiNiHf/SiO₂/Si shape Memory Film Composites for Bi-Directional Micro Actuation
The martensitic phase transformation in Ti₄₀.₄Ni₄₈Hf₁₁.₆ shape memory alloys is leveraged for bi-directional actuation with TiNiHf/SiO₂/Si composites. The shape memory properties of magnetron sputtered Ti₄₀.₄Ni₄₈Hf₁₁.₆ films annealed at 635°C – 5 min are influenced by film thickness and the underlying substrate.
Curtis, S.M., Sielenkämper, M., Arivanandhan, G., Dengiz, D., Li, Z., Jetter, J., Hanke, L., Bumke, L., Quandt, E., Wulfinghoff, S., and Kohl, M., 2022. TiNiHf/SiO₂/Si shape memory film composites for bi-directional micro actuation. International Journal of Smart and Nano Materials, 13(2), pp.293-314.
Integration of AlN Piezoelectric Thin Films on Ultralow Fatigue TiNiCu Shape Memory Alloys
Biomagnetic field sensors based on AlN/FeCoSiB magnetoelectric (ME) composites desire a resonant frequency that can be precisely tuned to match the biomagnetic signal of interest.
Curtis, S.M., Wolff, N., Dengiz, D., Lewitz, H., Jetter, J., Bumke, L., Hayes, P., Yarar, E., Thormählen, L., Kienle, L. and Meyners, D., 2020. Integration of AlN piezoelectric thin films on ultralow fatigue TiNiCu shape memory alloys. Journal of Materials Research, 35(10), pp.1298-1306.
Auxetic Superelastic TiNiCuCo Sputtered Thin-Films for Stretchable Electronics
Auxetic shape memory alloy (SMA) materials offer many opportunities for ballistics, deployable antennas, actuators, stretchable electronics, and biomedical devices. Auxetic materials are periodic structures characterized by a negative Poisson’s ratio, meaning they expand laterally when stretched longitudinally.
Curtis, S.M., Dengiz, D., Bumke, L. and Quandt, E., 2022. Auxetic Superelastic TiNiCuCo Sputtered Thin-Films For Stretchable Electronics. SMST2022, pp.11-13.
Structural Anisotropy in Stretchable Silicon
Patterned planar silicon (Si) semiconductor structures able to conform around 3D surfaces are promising candidates for wearable devices from solar cells to displays. Despite the known anisotropic material properties of crystalline semiconductors, prior evaluations have assumed isotropic stretchable mechanical behavior.
Curtis, S.M., Tompkins, R.P., Nichols, B.M., Graziano, M.B., Kierzewski, I., Smith, G., Leite, M.S. and Lazarus, N., 2019. Structural anisotropy in stretchable silicon. Advanced Electronic Materials, 5(7), p.1900003.
Temperature Homogenization of Co-Integrated Shape Memory—Silicon Bimorph Actuators
The high work density and beneficial downscaling of shape memory alloy (SMA) actuation performance provide a basis for the development of actuators and systems at microscales.
Arivanandhan, G., Li, Z., Curtis, S., Velvaluri, P., Quandt, E. and Kohl, M., 2020, November. Temperature Homogenization of Co-Integrated Shape Memory—Silicon Bimorph Actuators. In Proceedings (Vol. 64, No. 1, p. 8). MDPI.
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