Navigation Links
Microfabrication breakthrough could set piezoelectric material applications in motion
Date:11/17/2011

MADISON Integrating a complex, single-crystal material with "giant" piezoelectric properties onto silicon, University of Wisconsin-Madison engineers and physicists can fabricate low-voltage, near-nanoscale electromechanical devices that could lead to improvements in high-resolution 3-D imaging, signal processing, communications, energy harvesting, sensing, and actuators for nanopositioning devices, among others.

Led by Chang-Beom Eom, a UW-Madison professor of materials science and engineering and physics, the multi-institutional team published its results in the Nov. 18, issue of the journal Science. (Eom and his students also are co-authors on another paper, "Domain dynamics during ferroelectric switching," published in the same issue.)

Piezoelectric materials use mechanical motion to generate an electrical signal, such as the light that flashes in some children's shoe heels when they stomp their feet. Conversely, piezoelectrics also can use an electrical signal to generate mechanical motionfor example, piezoelectric materials are used to generate high-frequency acoustic waves for ultrasound imaging.

Eom studies the advanced piezoelectric material lead magnesium niobate-lead titanate, or PMN-PT. Such materials exhibit a "giant" piezoelectric response that can deliver much greater mechanical displacement with the same amount of electric field as traditional piezoelectric materials. They also can act as both actuators and sensors. For example, they use electricity to deliver an ultrasound wave that penetrates deeply into the body and returns data capable of displaying a high-quality 3-D image.

Currently, a major limitation of these advanced materials is that to incorporate them into very small-scale devices, researchers start with a bulk material and grind, cut and polish it to the size they desire. It's an imprecise, error-prone process that's intrinsically ill-suited for nanoelectromechanical systems (NEMS) or microelectromechanical systems (MEMS).

Until now, the complexity of PMN-PT has thwarted researchers' efforts to develop simple, reproducable microscale fabrication techniques.

Applying microscale fabrication techniques such as those used in computer electronics, Eom's team has overcome that barrier. He and his colleagues worked from the ground up to integrate PMN-PT seamlessly onto silicon. Because of potential chemical reactions among the components, they layered materials and carefully planned the locations of individual atoms. "You have to lay down the right element first," says Eom.

Onto a silicon "platform," his team adds a very thin layer of strontium titanate, which acts as a template and mimics the structure of silicon. Next comes a layer of strontium ruthenate, an electrode Eom developed some years ago, and finally, the single-crystal piezoelectric material PMN-PT.

The researchers have characterized the material's piezoelectric response, which correlates with theoretical predictions. "The properties of the single crystal we integrated on silicon are as good as the bulk single crystal," says Eom.

His team calls devices fabricated from this giant piezoelectric material "hyper-active MEMS" for their potential to offer researchers a high level of active control. Using the material, his team also developed a process for fabricating piezoelectric MEMS. Applied in signal processing, communications, medical imaging and nanopositioning actuators, hyper-active MEMS devices could reduce power consumption and increase actuator speed and sensor sensitivity. Additionally, through a process called energy harvesting, hyper-active MEMS devices could convert energy from sources such as mechanical vibrations into electricity that powers other small devicesfor example, for wireless communication.

The National Science Foundation is funding the research via a four-year, $1.35 million NIRT grant. At UW-Madison, team members include Lynn H. Matthias Professor in Electrical and Computer Engineering Professor Robert Blick and Physics Professor Mark Rzchowski. Other collaborators include people at the National Institute of Standards and Technology, Pennsylvania State University, the University of Michigan, Argonne National Laboratory, the University of California at Berkeley, and Cornell University.


'/>"/>

Contact: Chang-Beom Eom
eom@engr.wisc.edu
608-263-6305
University of Wisconsin-Madison
Source:Eurekalert

Related biology technology :

1. Natures Bioceuticals Enters Chronic Obstructive Pulmonary Disease Market After Acquiring Breakthrough Breathing Formula
2. Breakthrough in Preventing Food-borne Illnesses Wins $20,000 Grand Prize in Global Design Contest
3. The Human Brain is Sensitive to Light, Breakthrough Findings From Valkee and the University of Oulu
4. U.Va.s Pfister accomplishes breakthrough toward quantum computing
5. Sandias cooler technology offers fundamental breakthrough in heat transfer
6. Light propagation controlled in photonic chips -- major breakthrough in telecommunications field
7. USC and Coulter Foundation Partner to Invest $5M in Breakthrough Innovation in Biomedical Engineering
8. Sanford-Burnham Turns Big Data Into Scientific Breakthroughs With EMC Isilon
9. IBM and The Institute of Bioengineering and Nanotechnology Find Breakthrough for MRSA Treatment
10. Princeton engineers make breakthrough in ultra-sensitive sensor technology
11. Thermal Gradient Announces Breakthrough in Fast PCR Device Technology
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/9/2017)... ... October 09, 2017 , ... ... October 5, 2017, in the medical journal, Epilepsia, Brain Sentinel’s SPEAC® System ... standard, video EEG, in detecting generalized tonic-clonic seizures (GTCS) using surface electromyography ...
(Date:10/7/2017)... ... October 06, 2017 , ... ... genomic technologies, launched its ProxiMeta™ Hi-C metagenome deconvolution product, featuring the first ... accompanying cloud-based bioinformatics software to perform Hi-C metagenome deconvolution using their own ...
(Date:10/6/2017)... Boston, Mass. (PRWEB) , ... October 06, 2017 ... ... spotlight female entrepreneurship within the healthcare and technology sector at their fourth annual ... six panels featuring 30 inspiring speakers and the ELEVATE pitch competition showcasing early ...
(Date:10/5/2017)... ... October 05, 2017 , ... LabRoots , the leading provider of educational ... is giving back to cancer research with a month-long promotion supporting the advancement of ... 31, shoppers can use promo code PinkRibbon to get 10 percent off their purchase ...
Breaking Biology Technology:
(Date:6/30/2017)... , June 30, 2017 Today, ... developer and supplier of face and eye tracking ... Featured Product provider program. "Artificial ... innovative way to monitor a driver,s attentiveness levels ... from being able to detect fatigue and prevent ...
(Date:5/16/2017)... May 16, 2017  Veratad Technologies, LLC ( www.veratad.com ... age and identity verification solutions, announced today they will ... 2017, May 15 thru May 17, 2017, in ... International Trade Center. Identity impacts the ... in today,s quickly evolving digital world, defining identity is ...
(Date:4/19/2017)... , April 19, 2017 ... its vendor landscape is marked by the presence of ... is however held by five major players - 3M ... these companies accounted for nearly 61% of the global ... leading companies in the global military biometrics market boast ...
Breaking Biology News(10 mins):