A method of synthesizing carbon nanotubes. In one embodiment, the method includes the steps of: (a) dissolving a first amount of a first transition-metal salt and a second amount of a second transition-metal salt in water to form a solution; (b) adding a third amount of tannin to the solution to form a mixture; (c) heating the mixture to a first temperature for a first duration of time to form a sample; and (d) subjecting the sample to a microwave radiation for a second duration of time effective to produce a plurality of carbon nanotubes.
STATEMENT OF FEDERALLY-SPONSORED RESEARCH
The present invention was made with government support under Grant No. DE-FC 36-06 GO 86072 awarded by U.S. Department of Energy (DOE). The government has certain rights in the invention.