Biggest carbon-nanotube chip yet says ‘Hello, World!’

Scientists have created the largest computer chip yet to be made from carbon nanotubes: rolled up sheets of atom-thick graphene that conduct electricity at super-fast speeds.

Some researchers hope to use carbon nanotubes in future computers because they conduct electricity faster and more efficiently than silicon does. Until now, engineers have increased the power and speed of ordinary silicon computer processors by shrinking the switches known as transistors, but these are reaching a fundamental limit.

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