One-step synthesis and characterization of tree-like branched α-Si_3N_4 nano/submicron-structures by pyrolysis of a polymer precursor

摘要

Tree-like branched α-Si_3N_4 single-crystalline nano/submicron-structures were successfully synthesized in one step simply by catalytic pyrolysis of a powder mixture of an amorphous preceramic polymer (polyhydridomethylsilazane) and FeCb (as catalyst). The growth processes of the trunks and branches of the as-prepared structures were both controlled by vapor-liquid-solid mechanism. The luminescent behavior of the structures was also reported and discussed. An intensive photoluminescence, with peaks at 1.82, 2.16, 2.78, 3.24 and 3.97 eV, was observed.