April 20, 2009

Printable nanotubes store power

Come up with a way to spray single-walled carbon nanotubes and electrically conductive gels and you can make printable supercapacitors.

The technique involves spraying a tangle of single-walled carbon nanotubes to form a thin-film electrode and spraying a gel or liquid electrolyte. The resulting printable supercapacitor has an energy density of 6 watt hours per kilogram, which is at the high end of commercially available supercapacitors.

The thin-film supercapacitor can be made on flexible surfaces, and has the potential to expand the emerging field of printable electronics to include devices with integrated power storage.

Printable electronics include flexible displays, animated posters, smart labels and sensors.

Research paper:
Printable Thin Film Supercapacitors Using Single-Walled Carbon Nanotubes
Nano Letters, published online April 6, 2009

Researchers' homepages:
Martti Kaempgen
Yi Cui
George Gruner

Related stories and briefs:
Layers make better nanotube batteries -- related research

Back to ERN April 20, 2009



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