January 12, 2009
Layers make better nanotube
Carefully build up of layers of multiwall
carbon nanotubes and you have highly efficient electrodes for fuel
cells, batteries and supercapacitors.
The layering technique involves attaching molecules to the
multiwall carbon nanotubes that make the nanotubes either positively
or negatively charged. The thin films don't require polymer binders
because alternating layers of positively and negatively charged nanotubes
stick to each other. The pure nanotube thin films store and conduct
electricity better than thin films that contain polymers.
The layered multiwall nanotube thin films also store more
electricity than thin films of vertically aligned carbon nanotubes.
The layering method allows precise control of the thin films'
properties, which makes it easier to tailor the films for different
types of electrodes.
Assembly of All Carbon Nanotube Ultrathin Films for Electrochemical
Journal of the American Chemical Society, December 23, 2008
Hammond Research Group
Related stories and briefs:
carbon material stores big charge -- related research
nanosheets hold more electricity -- related research (note comment)
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