The December 2022 issue of IEEE Spectrum is here!

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Flexible, Printable Supercapacitor Built

Printable electronics now have a printable energy-storage option

2 min read

22 April 2009—The field of printable electronics has taken off in recent years, with researchers touting prototype wearable sensors, smart packaging labels, and even solar cells made with printing technology. However, little advancement has been made in developing printable, flexible energy-storage devices, such as supercapacitorsand batteries.

Now researchers from Stanford University and the University of California, Los Angeles, have built a flexible supercapacitor out of printable carbon nanotubes and polymer gel electrolyte. Their results were detailed this month in Nano Letters .

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The Transistor at 75

The past, present, and future of the modern world’s most important invention

2 min read
A photo of a birthday cake with 75 written on it.
Lisa Sheehan

Seventy-five years is a long time. It’s so long that most of us don’t remember a time before the transistor, and long enough for many engineers to have devoted entire careers to its use and development. In honor of this most important of technological achievements, this issue’s package of articles explores the transistor’s historical journey and potential future.

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