Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UNIST researchers engineer transformer-like carbon nanostructure

12.06.2017

A recent study, affiliated with UNIST has engineered a new type of carbon nanomaterials, capable of changing shapes and colors depending on the type of solvents used. Such materials have attracted much attention owing to their unique optical properties and structures.

In the study, the joint research team, led by Professor Byung Soo kim and Professor Oh Hoon Kwon has presented a unique design and synthesis of hybrid carbon nanosheets (CNSs), which show a strong solvatochromic behavior with wide color tunability ranging from blue to orange and even to white in various solvents.


Synthesis and optical properties of hybrid carbon nanosheets (CNSs).

Credit: UNIST

This unique hybrid CNS hosts clusters of carbon nanorings on the surface of graphene-oxide (GO) nanosheets as the product of the hydrothermal reaction of small molecular precursors in the presence of GO nanosheets. Moreover, under UV and visible-light excitation, the hybrid CNS exhibits tunable emission spanning the wide range of colors in a series of solvents with different polarities.

According to the research team, this interesting spectroscopic behavior is found to originate from hydrogen-bonding interactions between CNS and solvents, which eventually induce the morphological transition of CNS from 2D sheets to 3D crumpled morphologies, affecting the lifetimes of emissive states.

... more about:
»CNS »Choi »UNIST »nanostructure

"The clusters of carbon nanorings on the surface of GO nanosheets have different chemical reactions depending on the properties of solvents," says Yuri Choi (Combined M.S./Ph.D. student of Natural Science), the first author of the study. "The spectroscopic behavior of CNS is found to originate from hydrogen (H)-bonding interactions between CNS and solvents."

"This is one of the first studies to show clearly that the shape of CNS varies depending on the solvents," says Professor Kim. "Through this research, we hope to improve the physical characteristics of hybrid materials and expand its application fields."

In the study, Professor Kwon and his team analyzed the basic principles of fluorescent light control for CNSs, using time-resolved electronic spectroscopy. In the protic solvent, the structure of CNS showed orange emission was shown due to the loss of energy, caused by the lack of H-bonding within a CNS. On the other hand, it showed the green emission due to less energy lost in the aprotic solvent.

This study has been supported by the National Research Foundation of Korea (NRF) grant and by the Institute of Basic Science, Korea. The research team expects that this novel soft carbon nanostructure may open up a new possibility in tailoring the photophysical properties of carbon nanomaterials.

###

Journal Reference

Yuri Choi et al., "Morphology Tunable Hybrid Carbon Nanosheets with Solvatochromism", Advanced Materials, (2017).

Media Contact

JooHyeon Heo
joohyeonheo@unist.ac.kr
82-522-171-223

http://www.unist.ac.kr 

JooHyeon Heo | EurekAlert!

Further reports about: CNS Choi UNIST nanostructure

More articles from Materials Sciences:

nachricht Topological material switched off and on for the first time
11.12.2018 | ARC Centre of Excellence in Future Low-Energy Electronics Technologies

nachricht Proteins imaged in graphene liquid cell have higher radiation tolerance
10.12.2018 | INM - Leibniz-Institut für Neue Materialien gGmbH

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Lethal combination: Drug cocktail turns off the juice to cancer cells

A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.

The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...

Im Focus: New Foldable Drone Flies through Narrow Holes in Rescue Missions

A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

Im Focus: Researchers develop method to transfer entire 2D circuits to any smooth surface

What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.

Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...

Im Focus: Three components on one chip

Scientists at the University of Stuttgart and the Karlsruhe Institute of Technology (KIT) succeed in important further development on the way to quantum Computers.

Quantum computers one day should be able to solve certain computing problems much faster than a classical computer. One of the most promising approaches is...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

 
Latest News

New discoveries predict ability to forecast dementia from single molecule

12.12.2018 | Health and Medicine

CCNY-Yale researchers make shape shifting cell breakthrough

12.12.2018 | Physics and Astronomy

Pain: Perception and motor impulses arise in the brain independently of one another

12.12.2018 | Health and Medicine

VideoLinks
Science & Research
Overview of more VideoLinks >>>