Modified Carbon Nanotubes and Methods of Forming Carbon Nanotubes
AssigneeBattelle Memorial Institute
InventorsAmy M. Heintz, Steven Risser, Joel D. Elhard, Bryon P. Moore, Tao Liu, Bhima R. Vijayendran
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Abstract
In this invention, electrolytic, photochemical, chemical, and encapsulation processes can be used to achieve substantially completely stable doped carbon nanotubes. Preferred CNT structures and morphologies for achieving maximum doping effects are also described. Dopant formulations and methods for achieving doping of a broad distribution of tube types are also described.
Claims60
A solid carbon nanotube (CNT) composition, comprising:
- carbon nanotubes,
- at least 0.5 wt % S and at least 0.5 wt % Cl,
- and exhibiting a tangential mode (TM) position with a peak maximum between 1593 to 1605 cm−1 in the Raman spectrum.
The CNT composition of any of the preceding claims having a bulk conductivity greater than 300 S/cm.
The CNT composition of any of the preceding claims having a bulk conductivity in the range 300 S/cm to 50,000 S/cm.
The CNT composition of any of the preceding claims having a bulk conductivity in the range of 300 to 10,000 S/cm.
The CNT composition of any of the preceding claims having a bulk conductivity in the range of 2000 to 5000 S/cm.
The CNT composition of any of the preceding claims wherein the composition is a network film.
The CNT composition of any of the preceding claims having a volume fraction of CNTs greater than 0.40.
The CNT composition of any of the preceding claims having a film thickness greater than 20 nm.
The CNT composition of any of the preceding claims having a film thickness less than 500 nm.
The CNT composition of any of the preceding claims comprising a mixture of single and multiwalled CNTs.
The CNT composition of any of the preceding claims comprising at least 10 mass % bundles.
The CNT composition of any of the preceding claims having G/D greater than 8
The CNT composition of any of the preceding claims having G/D in the range of 8 to 40.
The CNT composition of any of the preceding claims having G/D in the range of 14 to 18.
The CNT composition of any of the preceding claims comprising at least 10 mass % belts.
A method of treating CNTs, comprising:
- providing CNTs, and
- contacting the CNTs with a doping agent
- and further characterized by at least one of the following:
- exposing the CNTs to a UV treatment;
- or
- introducing defects into the CNTs such that they exhibit a G/D ratio in the range of about 14 to about 22 prior to adding a doping agent;
- or
- exposing the CNTs to oxidative plasma treatment prior to or simultaneous with adding the doping agent;
- or
- exposing the CNTs to electron beam irradiation prior to or simultaneous with adding the doping agent;
- or
- using a doping catalyst to catalyze the doping step.
A multi-layer structure comprising a substrate, a storage layer, and a doped CNT layer in direct contact with the storage layer.
Dependencies are inferred from the claim text.