Professor uses diamond to produce graphene quantum dots andnano-ribbons of controlled structure

Kansas State University researchers have come closer to solving anold challenge of producing graphene quantum dots of controlledshape and size at large densities, which could revolutionizeelectronics and optoelectronics. Vikas Berry, William H. Honstead professor of chemical engineering,has developed a novel process that uses a diamond knife to cleavegraphite into graphite nanoblocks, which are precursors forgraphene quantum dots. These nanoblocks are then exfoliated toproduce ultrasmall sheets of carbon atoms of controlled shape andsize. Ultrasonic Cavitation Slimming Machine

By controlling the size and shape, the researchers can controlgraphene’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 publishedin Nature Communications and supports the university’s vision tobecome a top 50 public research university by 2025. The article isavailable online. “The process produces large quantities of graphene quantum dots ofcontrolled shape and size and we have conducted studies on theirstructural and electrical properties,” Berry said. Ultrasonic Cavitation Slimming Machine Manufacturer

While other researchers have been able to make quantum dots,Berry’s research team can make quantum dots with a controlledstructure in large quantities, which may allow these opticallyactive quantum dots to be used in solar cell and otheroptoelectronic applications. “There will be a wide range of applications of these quantum dots,”Berry said. “We expect that the field of graphene quantum dots willevolve as a result of this work since this new material has a greatpotential in several nanotechnologies.” It has been know that because of the edge states and quantumconfinement, the shape and size of graphene quantum dots dictatetheir electrical, optical, magnetic and chemical properties. Thiswork also shows proof of the opening of a band-gap in graphenenanoribbon films with a reduction in width. Further, Berry’s teamshows through high-resolution transmission electron micrographs andsimulations that the edges of the produces structures are straightand relatively smooth. Face Lifting Machines

Other collaborators on this work include Zhiping Xu from TsinghuaUniversity in China and David Moore from the University of Kansas.Xu conducted the molecular dynamics simulations. The co-authorsfrom Kansas State University include Nihar Mohanty, 2011 doctoralgraduate; T. S. Sreeprasad, postdoctoral fellow; Alfredo A.Rodriguez, 2012 graduate; and Ashvin Nagaraja, 2009 graduate.


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