A method of synthesizing nanodiamonds. In one embodiment, the present invention provides a method of synthesizing nanodiamonds, which includes the step of subjecting an amount of tannin to a microwave radiation for a duration of time effective to produce a plurality of nanodiamonds.
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.