A novel method, pulsed-laser induced reaction at liquid-solid interface (PLIIR), which is used to synthesize nano- crystallite, is developed. Nano-crystalline diamond with hexagonal lattice and cubic lattice and carbon nitride, which phases include (alpha) -C3N4, graphite-C3N4, (beta) -C3N4 and cubic-C3N4, are synthesized by this approach. Transmission electron microscopy (TEM), high resolution electron microscopy (HREM) and other methods are used to characterize the structures of the nano-crystallite. Graphite-C3N4 and cubic-C3N4 are reported for the first time in experiment.
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