Diamonds is the strongest naturally occurring material on Earth. It is also renowned for its incomparable properties, such as high stiffness, exceptional thermal conductivity, high chemical resistance, and high optical transparency. Although these remarkable properties of diamond make it highly desirable for many scientific and technological applications, progress has been slow due to its brittleness.
A recent study, affiliated with UNIST has unveiled that brittle diamonds can be bent and stretched elastically when made into ultrafine needles.
This breakthrough has been jointly conducted by Distinguished Professor Feng Ding's team from the Center for Multidimensional Carbon Materials (CMCM), within the Institute for Basic Science (IBS) at UNIST, in collaboration with an international team of researchers from Massachusetts Institute of Technology (MIT), City University of Hong Kong, and Nanyang Technological University. The results of the study has been reported this week in the prestigious jornal Science.
The team demonstrated that their nanoscale diamond needles could flex and stretch by as much as nine percent without breaking, then return to their original shape. Their discovery completely overturns previous theories that diamonds are brittle. Their results, the research team say, could open up unprecedented possibilities for tuning its optical, optomechanical, magnetic, phononic, and catalytic properties through elastic strain engineering.
"Ultrahigh elasticity of diamond is due to the paucity of internal defects."
Ordinary diamond in bulk form has a limit of well below one percent stretch, according to the researchers. In the study, Professor Ming's group handled the chemical calculation and the analysis of the crystal structure of diamond and ascribed that the ultrahigh elasticity of the diamond nanoneedles is due to the paucity of internal defects and the relatively smooth surface.
"Diamonds, either natural or artificial, have internal defects in their crystal structure," says Professor Ding. "When outside force is applied to these defects, they can crack and eventually break."
In the study, via detailed simulations, Professor Ding determined precisely how much stress and strain the diamond needles could accommodate without breaking. He determined the corresponding maximum local stress was close to the known theoretical limit achievable with a perfect, defect-free diamond. He noted that defect-free diamonds can stretch by as much as 12% without breaking.
"Diamond needles stretched and flexed as much as 9% without any breakage."
The research team from the City University of Hong Kong succeeded in fabricating nanoscale diamond needles by plasma-induced etching of diamond thin films deposited on Si substrates through bias-assisted chemical vapor deposition (CVD). As a result, the team was able to demonstrate ultralarge, fully reversible elastic deformation of nanoscale (~300 nanometers) single-crystalline and polycrystalline diamond needles.
The team measured the bending of the diamond needles, which were grown through a chemical vapor deposition process and then etched to their final shape, by observing them in a scanning electron microscope while pressing down on the needles with a standard nanoindenter diamond tip. They demonstrated experimentally that single-crystalline needles are simultaneously ultrastrong and susceptible to large elastic deformation, with fully reversible mechanical deformability of up to a maximum of 9% of elastic tensile strain.
The research team expects that their findings could lead to performance enhancement in applications, involving bioimaging and biosensing, strain-mediated nanomechanical resonators, drug delivery, data storage, and optomechanical devices, as well as ultrastrength nanostructures. Besides, Professor Ding noted that large elastic deformation in nanoscale diamond needles will be suitable for use in next-generation flexible and foldable displays.
Meanwhile, Professor Feng Ding joined the School of Materials Science and Engineering at UNIST in January 2017. Professor Ding currently serves as one of the group leader at IBS Research Center for Multidimensional Carbon Materials (CMCM). His current research interests include carbon materials research, such as graphene, carbon nanotubes, and diamond.
This study has been funded by the Research Grants Council of the Hong Kong Special Administrative Region, Singapore-MIT Alliance for Rresearch and Technology (SMART), Nanyang Technological University Singapore, and the National Natural Science Foundation of China.
Story Source: Materials provided by MIT News
Journal Reference: Amit Banerjee, et al., "Ultralarge elastic deformation of nanoscale diamond," Science, (2018).
JooHyeon Heo | EurekAlert!
Cementless fly ash binder makes concrete 'green'
19.06.2018 | Rice University
Ground-breaking discoveries could create superior alloys with many applications
19.06.2018 | Chalmers University of Technology
Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
19.06.2018 | Physics and Astronomy
19.06.2018 | Life Sciences
19.06.2018 | Physics and Astronomy