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Geometry-Tunable Stretchability and Piezoresistive Response in Growth-Programmable In-Plane Silicon Nanowire Springs
Haotian Wu1, Binfu Liu1, Shuyi Wang2
1Microelectronics Industry Research Institute, School of Physical Science and Technology (Integrated Circuit Science and Engineering), Yangzhou University, Yangzhou, 225009, P. R. China.
The Journal of Physical Chemistry Letters
|July 21, 2026
Summary
Researchers developed spring-shaped silicon nanowires (SiNWs) for stretchable strain sensors. Geometry programming precisely controls the trade-off between stretchability and sensitivity in these piezoresistive devices.
Area of Science:
- Materials Science
- Nanotechnology
- Mechanical Engineering
Background:
- Silicon nanowires (SiNWs) are excellent piezoresistive materials for strain sensing.
- Their intrinsic brittleness limits stretchability, creating a trade-off between deformability and sensitivity.
Purpose of the Study:
- To engineer stretchable SiNWs with controlled electromechanical properties.
- To overcome the inherent trade-off between stretchability and piezoresistive sensitivity in SiNWs.
Main Methods:
- Developed a growth-level geometry programming strategy to create spring-shaped SiNWs.
- Modulated spring amplitude to precisely define SiNW architecture.
- Performed mechanical and electrical analyses to evaluate performance.
Main Results:
- Achieved geometry-dependent tensile stretchability and piezoresistive response.
- Demonstrated that spring geometry controls stress transfer and deformation distribution.
- Small-amplitude springs: 20% strain, gauge factor of 5.1; Large-amplitude springs: 50% strain, gauge factor of 2.1.
Conclusions:
- Geometry programming at the growth level is a viable strategy for tailoring stretchable SiNWs.
- This approach enables precise control over the stretchability-sensitivity trade-off.
- Engineered spring-shaped SiNWs show significant potential for advanced strain sensing applications.
