These engineered films have great potential for energy harvesting applications, as well as in micro-electro-mechanical-systems (MEMS), micro actuators, and sensors for a variety of miniaturized systems, such as ultrasound imaging, microfluidics, and mechanical sensing.
Piezoelectric materials can transform electrical energy into mechanical energy and vice versa. Most MEMS utilize silicon, the standard material for semiconductor electronics, as the substrate. Integrating piezoelectric thin films onto silicon-based MEMS devices with dimensions from micrometers to a few millimeters in size will add an active component that can take advantage of motion, such as a footstep or a vibrating motor, to generate electric current, or use a small applied voltage to create micron level motion, such as in focusing a digital camera.
Previously, the best piezoelectric MEMS devices were made with layers of silicon and lead zirconium titanate (PZT) films. Recently, a team led by Chang-Beom Eom of University of Wisconsin-Madison synthesized a lead magnesium niobate-lead titanate (PMN-PT) thin film integrated on a silicon substrate.
The Penn State team, led by Susan Trolier-McKinstry, professor of ceramic science and engineering, and including research associate Srowthi Bharadwaja, PhD, measured the electrical and piezoelectric performance of the thin films and compared the PMN-PT films against the reported values of other micromachined actuator materials to show the potential of PMN-PT for actuator and energy harvesting applications.
In a recent article in Science, the team reported the highest values of piezoelectric properties for any piezoelectric thin film to-date, and a two-fold higher figure of merit than the best reported PZT films for energy harvesting applications. This increase in the effective piezoelectric activity in a thin film will result in a dramatic improvement in performance. For example, energy harvesting using such thin films will provide local power sources for wireless sensor nodes for bridges, aircraft, and potentially for human-body sensors.
Along with the researchers from Penn State and UW-Madison, the participating institutions included the National Institute of Standards and Technology (NIST), University of Michigan, University of California, Berkeley, Cornell University, and Argonne National Laboratory. The paper, titled “Giant Piezoelectricity on Si for Hyperactive MEMS,” appeared in the Nov. 18 issue of Science. Work at Penn State was supported by a National Security Science and Engineering Faculty Fellowship. Other support was provided by the National Science Foundation, the Department of Energy, the Air Force Office for Scientific Research, and a David Lucile Packard Fellowship.
For more information, contact Susan Trolier-McKinstry at 814 863-8348 or firstname.lastname@example.org. Visit the Materials Research Institute and its new home in the Millennium Science Complex at www.mri.psu.edu.
Susan Trolier-McKinstry | Newswise Science News
From foam to bone: Plant cellulose can pave the way for healthy bone implants
19.03.2019 | University of British Columbia
Additive printing processes for flexible touchscreens: increased materials and cost efficiency
19.03.2019 | INM - Leibniz-Institut für Neue Materialien gGmbH
The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona released its first image of the surface magnetic field of another star. In a paper in the European journal Astronomy & Astrophysics, the PEPSI team presents a Zeeman- Doppler-Image of the surface of the magnetically active star II Pegasi.
A special technique allows astronomers to resolve the surfaces of faraway stars. Those are otherwise only seen as point sources, even in the largest telescopes...
Researchers at Chalmers University of Technology and the University of Gothenburg, Sweden, have proposed a way to create a completely new source of radiation. Ultra-intense light pulses consist of the motion of a single wave and can be described as a tsunami of light. The strong wave can be used to study interactions between matter and light in a unique way. Their research is now published in the scientific journal Physical Review Letters.
"This source of radiation lets us look at reality through a new angle - it is like twisting a mirror and discovering something completely different," says...
New research group at the University of Jena combines theory and experiment to demonstrate for the first time certain physical processes in a quantum vacuum
For most people, a vacuum is an empty space. Quantum physics, on the other hand, assumes that even in this lowest-energy state, particles and antiparticles...
Physicists in the EPic Lab at University of Sussex make crucial development in global race to develop a portable atomic clock
Scientists in the Emergent Photonics Lab (EPic Lab) at the University of Sussex have made a breakthrough to a crucial element of an atomic clock - devices...
Every year earthquakes worldwide claim hundreds or even thousands of lives. Forewarning allows people to head for safety and a matter of seconds could spell...
11.03.2019 | Event News
01.03.2019 | Event News
28.02.2019 | Event News
19.03.2019 | Physics and Astronomy
19.03.2019 | Life Sciences
19.03.2019 | Physics and Astronomy