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Posted: Apr 19, 2012

Microscopy yields first proof of ferroelectricity in simplest amino acid

(Nanowerk News) The boundary between electronics and biology is blurring with the first detection by researchers at Department of Energy's Oak Ridge National Laboratory of ferroelectric properties in an amino acid called glycine.
A multi-institutional research team led by Andrei Kholkin of the University of Aveiro, Portugal, used a combination of experiments and modeling to identify and explain the presence of ferroelectricity, a property where materials switch their polarization when an electric field is applied, in the simplest known amino acid—glycine see paper in Advanced Functional Materials: ("Nanoscale Ferroelectricity in Crystalline γ-Glycine").
ferroelectric domains (seen as red stripes) in the simplest known amino acid - glycine
ORNL researchers detected for the first time ferroelectric domains (seen as red stripes) in the simplest known amino acid - glycine.
"The discovery of ferroelectricity opens new pathways to novel classes of bioelectronic logic and memory devices, where polarization switching is used to record and retrieve information in the form of ferroelectric domains," said coauthor and senior scientist at ORNL's Center for Nanophase Materials Sciences (CNMS) Sergei Kalinin.
Although certain biological molecules like glycine are known to be piezoelectric, a phenomenon in which materials respond to pressure by producing electricity, ferroelectricity is relatively rare in the realm of biology. Thus, scientists are still unclear about the potential applications of ferroelectric biomaterials.
"This research helps paves the way toward building memory devices made of molecules that already exist in our bodies," Kholkin said.
For example, making use of the ability to switch polarization through tiny electric fields may help build nanorobots that can swim through human blood. Kalinin cautions that such nanotechnology is still a long way in the future.
"Clearly there is a very long road from studying electromechanical coupling on the molecular level to making a nanomotor that can flow through blood," Kalinin said. "But unless you have a way to make this motor and study it, there will be no second and third steps. Our method can offer an option for quantitative and reproducible study of this electromechanical conversion."
The study builds on previous research at ORNL's CNMS, where Kalinin and others are developing new tools such as the piezoresponse force microscopy used in the experimental study of glycine.
"It turns out that piezoresponse force microsopy is perfectly suited to observe the fine details in biological systems at the nanoscale," Kalinin said. "With this type of microscopy, you gain the capability to study electromechanical motion on the level of a single molecule or small number of molecular assemblies. This scale is exactly where interesting things can happen."
Kholkin's lab grew the crystalline samples of glycine that were studied by his team and by the ORNL microscopy group. In addition to the experimental measurements, the team's theorists verified the ferroelectricity with molecular dynamics simulations that explained the mechanisms behind the observed behavior.
Research team members are ORNL's Nina Balke, Stephen Jesse, Alexander Tselev, Pratul Agarwal and Bobby Sumpter; the University of Aveiro's Alejandro Heredia, Igor Bdikin and José Gracio; and Vincent Meunier of Rensselaer Polytechnic Institute.
Source: Oak Ridge National Laboratory
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