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A hybrid material is provided which comprises a first single-walled nanotube having a lumen, and a fill molecule contained within the lumen of the single-walled nanotube. A method for producing the hybrid material is also provided wherein a single-walled nanotube is contacted with a fill molecule to

A hybrid material is provided which comprises a first single-walled nanotube having a lumen, and a fill molecule contained within the lumen of the single-walled nanotube. A method for producing the hybrid material is also provided wherein a single-walled nanotube is contacted with a fill molecule to cause the fill molecule to enter the lumen of the single-walled nanotube.

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What is claimed is: 1. A hybrid material comprising: a. a first single-walled nanotube having a lumen; and b. a plurality of regularly spaced fullerene molecules contained within the lumen of the first single-walled nanotube. 2. The hybrid material of claim 1 wherein the first single-walled nano

What is claimed is: 1. A hybrid material comprising: a. a first single-walled nanotube having a lumen; and b. a plurality of regularly spaced fullerene molecules contained within the lumen of the first single-walled nanotube. 2. The hybrid material of claim 1 wherein the first single-walled nanotube has a diameter in the range of from about 1.3 nm to about 1.5 nm. 3. The hybrid material of claim 1 wherein the fullerene molecules include at least one C60 molecule. 4. The hybrid material of claim 3 wherein the fullerene molecules include a plurality of C60 molecules. 5. The hybrid material of claim 1 wherein the fullerene molecules include at least one carbon-based capsule. 6. The hybrid material of claim 5 wherein the carbon-based capsule comprises a hemispherically-capped cylinder of carbon having 60+10 n carbon atoms, wherein n≧0. 7. The hybrid material of claim 6 wherein the hemispherically-capped cylinder of carbon has a length greater than a long dimension of a C70 molecule. 8. The hybrid material of claim 1 wherein the fullerene molecules include at least one second single-walled nanotube. 9. The hybrid material of claim 8 wherein the second single-walled nanotube has a diameter in the range of from about 0.6 nm to about 0.8 nm. 10. The hybrid material of claim 9 wherein the first single-walled nanotube has a diameter in the range of from about 1.3 nm to about 1.5 nm. 11. The hybrid material of claim 1 wherein the fullerene molecules include at least one a metastable structure. 12. The hybrid material of claim 1, wherein the first single-walled nanotube is a carbon nanotube or a boron-nitride nanotube. 13. The hybrid material of claim 1, wherein one or more of the fullerene molecules is a metallofullerene. 14. The hybrid material of claim 13, wherein the metallofullerene includes one or more transition metal elements. 15. The hybrid material of claim 14, wherein the one or more transition metal elements includes lanthanum. 16. The hybrid material of claim 13, wherein the metallofullerene includes La2@C80. 17. The hybrid material of claim 16, wherein the La2@C80 has a spheroidal shaped C80 cage. 18. The hybrid material of claim 1, wherein the fullerene molecules include a plurality of La2@C80. 19. A bulk material comprising single-walled nanotubes having lumens, wherein at least about 5% of the single-walled nanotubes contain a plurality of regularly spaced fullerene molecules within the lumen of the single-walled nanotube. 20. The bulk material of claim 19 wherein the single-walled nanotubes are arranged as a sheet of nanotubes. 21. The bulk material of claim 19, wherein at least about 50% of the single-walled nanotubes contain a plurality of regularly spaced fullerene molecules within the lumen of the single-walled nanotube. 22. The bulk material of claim 21, wherein at least about 80% of the single-walled nanotubes contain a plurality of regularly spaced fullerene molecules within the lumen of the single-walled nanotube.