To use all functions of this page, please activate cookies in your browser.
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
- My watch list
- My saved searches
- My saved topics
- My newsletter
Professor uses diamond to produce graphene quantum dots and nano-ribbons of controlled structure
21-05-2012: Kansas State University researchers have come closer to solving an old challenge of producing graphene quantum dots of controlled shape and size at large densities, which could revolutionize electronics and optoelectronics.
Vikas Berry, William H. Honstead professor of chemical engineering, has developed a novel process that uses a diamond knife to cleave graphite into graphite nanoblocks, which are precursors for graphene quantum dots. These nanoblocks are then exfoliated to produce ultrasmall sheets of carbon atoms of controlled shape and size.
By controlling the size and shape, the researchers can control graphene's properties over a wide range for varied applications, such as solar cells, electronics, optical dyes, biomarkers, composites and particulate systems. Their work has been published in Nature Communications.
"The process produces large quantities of graphene quantum dots of controlled shape and size and we have conducted studies on their structural and electrical properties," Berry said.
While other researchers have been able to make quantum dots, Berry's research team can make quantum dots with a controlled structure in large quantities, which may allow these optically active quantum dots to be used in solar cell and other optoelectronic applications.
"There will be a wide range of applications of these quantum dots," Berry said. "We expect that the field of graphene quantum dots will evolve as a result of this work since this new material has a great potential in several nanotechnologies."
It has been know that because of the edge states and quantum confinement, the shape and size of graphene quantum dots dictate their electrical, optical, magnetic and chemical properties. This work also shows proof of the opening of a band-gap in graphene nanoribbon films with a reduction in width. Further, Berry's team shows through high-resolution transmission electron micrographs and simulations that the edges of the produces structures are straight and relatively smooth.
This is where you can add this news to your personal favourites
- 1Drew Industrial Division of Ashland Specialty Chemical Company purchases industrial water-treatment business of London-based Fer
- 2Allegra® Launched in Japan
- 3LG-DOW Polycarbonate Plant Starts Production in Korea to Effectively Meet Regional Needs
- 4Caflon® surfactants from Univar as substitutes for banned nonylphenol ethoxylates
- 5Honeywell Appoints Terrence Hahn as Vice President and General Manager for Fluorine Products
- 6Knoll AG: Pharma business sold for $6.9 billion:
- 7Plurafac LF 303 - Plurafac LF 305: The new generation of low-foam surfactants
- 8Not just cars, but living organisms need antifreeze to survive
- 9Putting electronic cigarettes to the test
- 10Baytron P®– Gateway to a new generation of polymers
- New molecular probes that shed light on biological systems
- Driving magnesium micromotors with seawater
- A new laser paradigm: An electrically injected polariton laser
- UC Santa Barbara scientist studies methane levels in cross-continent drive
- Never-before-seen energy pattern observed at National High Magnetic Field Laboratory