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Solution of carbon nanotubes

In this dark solution, IBM makes use of carbon nanutubes -- very small structures made of a lattice of carbon atoms rolled into a cylindrical shape. A team of eight researchers have figured out a way to precisely place them on a computer chip, IBM announced today. The new technique helps improve the nanotubes' chances in the hunt for alternatives once silicon transistor technology, the beating heart of today's, runs out of steam.
Photo by: IBM

Carbon nanotube model

A model of a carbon nanotube with no end caps.
Photo by: IBM

Nanotubes aligned in hafnium oxide channel

This computer model shows how carbon nanotubes bond chemically with a special coating of materials in a trench of exposed hafnium oxide.
Photo by: IBM

IBM carbon nanotube placement demonstration

The dark lines are carbon nanotubes that sometimes -- but not always -- are placed in trenches. The more accurately IBM can place the nanotubes, the more likely they can be used as semiconductor devices in computer chips. The density of carbon nanotubes shown here permits a billion per square centimeter.
Photo by: IBM

IBM carbon nanotube test chip

In this close-up image, the very thin black lines are carbon nanotubes that span the gap between two electrical contacts. IBM strives to get only a single nanotube in each of the channels, visible as white outlines.
Photo by: IBM

IBM carbon nanotube self-assembly technique

Chemical bonding attaches carbon nanotubes to channels of exposed hafnium oxide in IBM's fabrication process.
Photo by: IBM

Carbon nanotubes' hafnium oxide affinity

IBM's silicon wafers have two surfaces on top, hafnium oxide and silicon dioxide. This close-up image shows speckles of carbon nanotubes that bond only with the hafnium oxide, part of IBM's approach to positioning them precisely on a chip.
Photo by: IBM

IBM Carbon nanotube chip wafer

IBM researcher Hongsik Park looks over a chip wafer with carbon nanotubes. The wafer has two surfaces, trenches made of hafnium oxide that attract carbon nanotubes in a special solution silicon oxide that doesn't.
Photo by: IBM

IBM carbon nanotube testing chip

IBM's technique can arrange single carbon nanotubes -- and sometimes pairs -- between two electrical contacts. It's an essential part of making a transistor in which a nanotube leads from a source on one side to a drain on the other. At left in this is an image of a chip designed to test the technology electrically; at right is a close-up of the nanotubes stretching from one electrical contact to another.
Photo by: IBM

Carbon: Graphene, nanotubes, graphite

The chickenwire-like lattice of carbon atoms just one atom thick is called graphene, one candidate for a new chip semiconductor material. Another is a cylindrical configuration called a carbon nanotube. A 60-atom sphere is called a buckyball. Many sheets of graphene makes graphite, the form of carbon used in pencil lead.
Photo by: Royal Swedish Academy of Sciences


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