Mechanical properties of nanomaterials can be altered due to the application of voltage, University of Wyoming researchers have discovered.
The researchers, led by TeYu Chien, a UW assistant professor in the Department of Physics and Astronomy, determined that the electric field is responsible for altering the fracture toughness of nanomaterials, which are used in state-of-the-art electronic devices. It is the first observed evidence that the electric field changes the fracture toughness at a nanometer scale.
This finding opens the way for further investigation of nanomaterials regarding electric field-mechanical property interactions, which is extremely important for applications and fundamental research.
Chien is the lead author of a paper, titled “Built-in Electric Field Induced Mechanical Property Change at the Lanthanum Nickelate/Nb-doped Strontium Titanate Interfaces,” that was recently published in Scientific Reports. Scientific Reports is an online, open-access journal from the publishers of Nature. The journal publishes scientifically valid primary research from all areas of the natural and clinical sciences.
Other researchers who contributed to the paper are from the University of Arkansas, University of Tennessee and Argonne National Laboratory in Argonne, Ill.
Chien and his research team studied the surfaces of the fractured interfaces of ceramic materials, including lanthanum nickelate and strontium titanate with a small amount of niobium. The researchers revealed that strontium titanate, within a few nanometers of the interfaces, fractured differently from the strontium titanate away from the interfaces.
The two ceramic materials were chosen because one is a metallic oxide while the other is a semiconductor. When the two types of materials come into contact with each other, an intrinsic electric field will automatically be formed in a region, known as the Schottky barrier, near the interface, Chien explains. The Schottky barrier refers to the region where an intrinsic electric field is formed at metal/semiconductor interfaces.
The intrinsic electric field at interfaces is an inevitable phenomenon whenever one material is in contact with another. The electric field effects on the mechanical properties of materials are rarely studied, especially for nanomaterials. Understanding electric field effects is extremely important for applications of nanoelectromechanical system (NEMS), which are devices, such as actuators, integrating electrical and mechanical functionalities on the nanoscale.
For NEMS materials made in nanoscale, understanding the mechanical properties affected by electric fields is crucial for full control of device performance. The observations in this study pave the way to better understand the mechanical properties of nanomaterials.
“The electric field changes the inter-atomic bond length in the crystal by pushing positively and negatively charged ions in opposite directions,” Chien says. “Altering bond length changes bond strength. Hence, the mechanical properties, such as fracture toughness.”
“The whole picture is this: The intrinsic electric field in the Schottky barrier was created at the interfaces. This then polarized the materials near the interfaces by changing the atomic positions in the crystal. The changed atomic positions altered the inter-atomic bond length inside the materials to change the mechanical properties near the interfaces,” Chien summarizes.
The Latest on: Mechanical properties of nanomaterials
via Google News
The Latest on: Mechanical properties of nanomaterials
- Technique for Recycling Nanowires in Electronicson August 5, 2021 at 3:38 am
Researchers have demonstrated a low-cost technique for retrieving nanowires from electronic devices that have reached the end of their utility and then using those nanowires in new devices. The work ...
- Nanowire recycling: Goal of more sustainable electronics receives a boost from NCSUon July 27, 2021 at 3:37 am
“We’ve demonstrated an approach that allows us to recycle nanowires, and that we think could be extended to other nanomaterials ... Professor of Mechanical and Aerospace Engineering ...
- Method retrieves and recycles nanowireson July 27, 2021 at 1:00 am
Researchers have demonstrated a low-cost technique for retrieving nanowires from end-of-life electronics and recycling them in new devices.
- Researchers demonstrate technique for recycling nanowires in electronicson July 26, 2021 at 11:14 am
“We’ve demonstrated an approach that allows us to recycle nanowires, and that we think could be extended to other nanomaterials – including ... Adams Distinguished Professor of Mechanical and ...
- Researchers demonstrate technique for recycling nanowires in electronicson July 25, 2021 at 5:00 pm
"We've demonstrated an approach that allows us to recycle nanowires, and that we think could be extended to other nanomaterials ... Distinguished Professor of Mechanical and Aerospace Engineering ...
- Nanotechnology development in Iranian agricultural sectoron July 25, 2021 at 5:00 pm
TEHRAN – Agriculture is one of the fields in which nanotechnology has been able to develop, as over 50 widely used nanoproducts have been launched in the agricultural sector of Iran. Although the use ...
- New framework applies machine learning to atomistic modelingon July 22, 2021 at 5:59 am
Designing new nanomaterials is an important aspect of developing next ... a computational approach that predicts how these materials behave by accounting for their properties at the smallest level.
- 8.4: Physical Properties of Nanomaterialson February 18, 2018 at 12:50 am
Mechanical properties of nanomaterials may reach the theoretical strength, which are one or two orders of magnitude higher than that of single crystals in the bulk form. The enhancement in mechanical ...
via Bing News