Three-dimensional piezoelectric polymer microsystems for vibrational energy harvesting, robotic interfaces and biomedical implants
- Northwestern Univ., Evanston, IL (United States)
- Northwestern Univ., Evanston, IL (United States); Tianjin Univ. (China)
- Univ. of Missouri, Columbia, MO (United States)
- Northwestern Univ., Evanston, IL (United States); Shanghai Jiaotong Univ. (China)
- Northwestern Univ., Evanston, IL (United States); Northwestern Univ. Feinberg School of Medicine, Chicago, IL (United States)
- Tsinghua Univ., Beijing (China)
Piezoelectric microsystems are of use in areas such as mechanical sensing, energy conversion and robotics. The systems typically have a planar structure, but transforming them into complex three-dimensional (3D) frameworks could enhance and extend their various modes of operation. Here, we report a controlled, nonlinear buckling process to convert lithographically defined two-dimensional patterns of electrodes and thin films of piezoelectric polymers into sophisticated 3D piezoelectric microsystems. To illustrate the engineering versatility of the approach, we create more than twenty different 3D geometries. With these structures, we then demonstrate applications in energy harvesting with tailored mechanical properties and root-mean-square voltages ranging from 2 mV to 790 mV, in multifunctional sensors for robotic prosthetic interfaces with improved responsivity (for example, anisotropic responses and sensitivity of 60 mV N-1 for normal force), and in bio-integrated devices with in vivo operational capabilities. We note the 3D geometries, especially those with ultralow stiffnesses or asymmetric layouts, yield unique mechanical attributes and levels of functionality that would be difficult or impossible to achieve with conventional two-dimensional designs.
- Research Organization:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); Ryan Fellowship; Northwestern University International Institute for Nanotechnology
- Grant/Contract Number:
- FG02-07ER46471
- OSTI ID:
- 1607431
- Journal Information:
- Nature Electronics, Vol. 2, Issue 1; ISSN 2520-1131
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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