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Nanotubes and nanotube-based devices are implemented in a variety of applications. According to an example embodiment of the present invention, a nanotube is doped with an impurity atom and used to detect the presence of a particular molecular species as a function of the particular molecular specie

Nanotubes and nanotube-based devices are implemented in a variety of applications. According to an example embodiment of the present invention, a nanotube is doped with an impurity atom and used to detect the presence of a particular molecular species as a function of the particular molecular species bonding to the impurity atom. In one implementation, the doped nanotube responds electrically to the bonding of the particular molecular species to the impurity atom. With this approach, nanotubes such as single-walled carbon nanotubes can be doped to respond selectively to one or more types of molecular species.

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What is claimed is: 1. A nanotube device comprising at least one doped carbon nanotube being configured and arranged to exhibit a detectable electrical response when introduced to a molecular species, the carbon nanotube being doped with a dopant selected from the group of Boron and Nitrogen, and b

What is claimed is: 1. A nanotube device comprising at least one doped carbon nanotube being configured and arranged to exhibit a detectable electrical response when introduced to a molecular species, the carbon nanotube being doped with a dopant selected from the group of Boron and Nitrogen, and being doped to a dopant concentration to effect a particular electrical response when the carbon nanotube is introduced to a selected molecular species. 2. The nanotube device of claim 1, wherein the carbon nanotube is doped to a dopant concentration such that the doped carbon nanotube responds electrically to CO. 3. The nanotube device of claim 2, wherein the carbon nanotube is doped to a dopant concentration such that the doped carbon nanotube responds electrically to H2O. 4. The nanotube device of claim 1, wherein the carbon nanotube is doped to a dopant concentration such that the doped carbon nanotube responds electrically to H2O. 5. The nanotube device of claim 1, further comprising an array of carbon nanotubes, each carbon nanotube being doped with an impurity atom and being configured and arranged to exhibit a detectable electrical response when introduced to a molecular species. 6. The nanotube device of claim 1, wherein the carbon nanotube is doped with at least two dopant types. 7. The nanotube device of claim 6, wherein the carbon nanotube is doped with Boron and Nitrogen. 8. The nanotube device of claim 1, wherein the carbon nanotube is doped with Boron atoms. 9. The nanotube device of claim 1, wherein the carbon nanotube is doped with Nitrogen atoms. 10. The nanotube device of claim 1, wherein the carbon nanotube is doped with a Boron-Nitrogen atom pair. 11. The nanotube device of claim 1, wherein the carbon nanotube is doped with a Boron-Nitrogen-Boron atom complex. 12. The nanotube device of claim 1, wherein the carbon nanotube is doped with a Nitrogen-Boron-Nitrogen complex. 13. The nanotube device of claim 1, wherein the carbon nanotube is doped with Boron and wherein a Boron atom of the doped carbon nanotube is configured and arranged to bond to an H2O molecule via the oxygen atom of the H2O molecule. 14. The nanotube device of claim 1, wherein the carbon nanotube is doped with Nitrogen and wherein a Nitrogen atom of the doped carbon nanotube is configured and arranged to bond to an H2O molecule via the oxygen atom of the H2O molecule. 15. The nanotube device of claim 1, wherein a dopant atom of the doped carbon nanotube is configured and arranged to bond to a CO molecule via the carbon atom of the CO molecule. 16. The nanotube device of claim 1, wherein a dopant atom of the doped carbon nanotube is configured and arranged to bond to a CO molecule via the oxygen atom of the CO molecule. 17. The nanotube device of claim 1, wherein the carbon nanotube is a single-walled carbon nanotube. 18. The nanotube device of claim 17, wherein the dopant is disposed in the wall of the carbon nanotube. 19. The nanotube device of claim 17, wherein the dopant is bonded to a carbon molecule in the wall of the carbon nanotube and extends outward from the wall. 20. The nanotube device of claim 1, wherein the nanotube is doped with dopants that form a p-n junction on the nanotube, the p-n junction having nonlinear sensor characteristics and being configured and arranged to electrically respond upon exposure to selected molecules. 21. The nanotube device of claim 1, wherein the doped carbon nanotube is configured and arranged to electrically respond to an ionic compound. 22. The nanotube device of claim 1, wherein the carbon nanotube is doped by replacing a carbon atom in the crystalline structure of the nanotube. 23. The nanotube device of claim 1, further comprising a detection circuit adapted for detecting the detectable electrical response of the carbon nanotube. 24. The nanotube device of claim 1, wherein the doped carbon nanotube is substitutionally doped. 25. The nanotube device of claim 1, wherein the doped carbon nanotube is externally doped. 26. The nanotube device of claim 1, wherein the doped carbon nanotube is internally doped. 27. A molecular sensor comprising: at least one carbon nanotube having opposite ends and being configured and arranged to exhibit a detectable electrical response when introduced to a molecular species, the at least one carbon nanotube being doped with a dopant selected from the group of Boron and Nitrogen, and being doped to a dopant concentration to effect a particular electrical response when the carbon nanotube is introduced to a selected molecular species; electrodes coupled to each end of the at least one carbon nanotube; and a detection circuit coupled to the electrodes and configured and arranged to detect the electrical response of the at least one carbon nanotube to the molecular species. 28. The molecular sensor of claim 27, wherein the detection circuit is configured and arranged to detect a change in the detected electrical characteristic, the change in the detected electrical characteristic being responsive to molecules introduced to the carbon nanotube. 29. The molecular sensor of claim 28, wherein the detection circuit is configured and arranged to detect the concentration of the molecules introduced to the carbon nanotube as a function of the detected electrical characteristic. 30. The molecular sensor of claim 28, wherein the detection circuit is configured and arranged to detect the composition of the molecules introduced to the carbon nanotube as a function of the detected electrical characteristic. 31. The nanotube device of claim 27, wherein the carbon nanotube is doped with dopant atoms at different locations on the carbon nanotube and wherein the detection circuit is configured and arranged to detect an electrical response of the nanotube to a molecule bonding to one of the dopant atoms and to detect the physical location of the molecule bonding to one of the dopant atoms as a function of the electrical response. 32. The nanotube device of claim 27, further comprising a voltage application circuit adapted for applying a voltage pulse to the carbon nanotube for identifying a molecular species. 33. The nanotube device of claim 32, wherein the voltage application circuit is adapted for altering an electrical characteristic of the carbon nanotube such that an electrical response of the carbon nanotube to a particular molecular species can be detected by the detection circuit.