Jan. 19, 2007 ORNL researchers performing basic research have discovered a carbon nanotube-based system that functions like an atom-scale switch.
Their approach is to perform first-principles calculations on positioning a molecule inside a carbon nanotube to affect the electronic current flowing across it.
The result is an electrical gate at the molecular level: In one position, the molecular gate is open, allowing current through; in another position, the gate is closed, blocking the current. In a silicon chip, the gate is a silicon oxide barrier within the structure of the chip. In the ORNL model, the gate is a short molecule --encapsulated inside the carbon nanotube-- that is about one nanometer in size, or three orders of magnitude smaller than a silicon chip.
The paper is slated to appear in the Feb 2 Physical Review Letters.
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