Nov 27, Nanotechnology/Nanomaterials
Graphene, composed of an atomically thin layer of carbon, does not by itself have the necessary properties that lend itself for use in modern nanoelectronics. To achieve this, other elements need to be added to the mix. When oxygen is added chemically to graphene, for example, a property called the band-gap is created. The band-gap determines the electrical conductivity of a material, an important factor in creating useful electronic devices. However, at this stage, the mix is a disorganized arrangement of atoms, and results in poor electronic properties, including the band-gap. Because of this it can only be used in basic electronic devices such as supercapacitors, sensors, and flexible transparent conductive electrodes.
In this publication researchers describe a method for annealing (heating) the graphene and oxygen mix resulting in a previously unobserved atomic structure. It is comprised of layers of oxygen poor graphene sandwiched between layers of oxygen rich graphene (graphene oxide).
In the image, the number of rings corresponds to the complexity of the different structures in the Graphene-Oxide (G-O) compound. The left side of the image corresponds to the G-O compound before annealing (heating). The right side of the image, corresponding to the compound after annealing, shows additional rings indicating a more complex and ordered structure.
Scientists determined that the new carbon based structure shows promise allowing them to tailor it creating, for example, ideal "band gaps" for use in nanoelectronic devices such as sensors, transistors, and optoelectronic devices.
More information: http://pubs.acs.org/doi/abs/10.1021/nn203160n
Provided by University of Wisconsin-Madison
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