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Sorting carbon nanotubes by electronic structure using density differentiation
Using the scalable technique of density-gradient ultracentrifugation, isolated narrow distributions of SWNTs in which >97% are within a 0.02-nm-diameter range are isolated.
Nanotechnology Research Directions for Societal Needs in 2020: Retrospective and Outlook
1. Enabling and Investigative Tools: Theory, Modeling, and Simulation 2. Enabling and Investigative Tools: Measuring Methods,Instruments and Metrology 3. Synthesis, Processing and Manufacturing of
Colloidal properties and stability of graphene oxide nanomaterials in the aquatic environment.
GO nanomaterials will be stable in the natural aquatic environment and that significant aqueous transport of GO is possible, according to time-resolved dynamic light scattering relevant to natural and engineered systems.
Current saturation and electrical breakdown in multiwalled carbon nanotubes.
In air failure is initiated by oxidation at a particular power, whereas in vacuum MWNTs can withstand much higher power densities and reach their full current carrying capacities, and the initiation of this failure is very sensitive to air exposure.
Solution phase production of graphene with controlled thickness via density differentiation.
Graphene flakes with controlled thicknesses are isolated in solution using density gradient ultracentrifugation, which results in graphene-surfactant complexes having buoyant densities that vary with graphene thickness.
Progress towards monodisperse single-walled carbon nanotubes.
  • M. Hersam
  • Materials Science, Medicine
    Nature nanotechnology
  • 1 July 2008
This review highlights post-synthetic approaches for sorting single-walled carbon nanotubes - including selective chemistry, electrical breakdown, dielectrophoresis, chromatography and ultracentrifugation - and progress towards selective growth of monodisperse samples.
Minimizing oxidation and stable nanoscale dispersion improves the biocompatibility of graphene in the lung.
The results demonstrate that the covalent oxidation of graphene is a major contributor to its pulmonary toxicity and suggest that dispersion of pristine graphene in Pluronic provides a pathway for the safe handling and potential biomedical application of two-dimensional carbon nanomaterials.
Enrichment of single-walled carbon nanotubes by diameter in density gradients.
The bulk enrichment and separation of single-walled carbon nanotubes by diameter has been achieved through ultracentrifugation of DNA-wrappedSWNTs in aqueous density gradients and the optical absorbance spectra of the separated SWNTs indicate that SWNTS of decreasing diameter are increasingly more buoyant.
80 GHz field-effect transistors produced using high purity semiconducting single-walled carbon nanotubes
This paper presents the high frequency performance of single-walled carbon nanotube (SWNT) field-effect transistors, with channel consisting of dense networks of high purity semiconducting SWNTs.
Emerging device applications for semiconducting two-dimensional transition metal dichalcogenides.
By critically assessing and comparing the performance of these devices with competing technologies, the merits and shortcomings of this emerging class of electronic materials are identified, thereby providing a roadmap for future development.