A TEMPLATE-FREE SOLUTION METHOD BASED ON SOLID-LIQUID INTERFACE REACTION TOWARDS DENDRITIC PbSe NANOSTRUCTURES

A template-free solution method based on solid-liquid interface reaction has been developed for fabricating metal chalcogenide dendritic nanostructures. Well-defined PbSe. dendrites with four branches can be large-scale synthesized with metal lead foil as Pb2+ source and Na2SeO3 as Se2+ source in solvothermal conditions. The nanorods in each branch are parallel to each other in the same plane and are perpendicular to the trunk. It was found that PbSe cubes first formed on the lead substrate through a direct surface reaction and that subsequent crystal growth preferentially took place on the vertex of these PbSe cubes, leading to the formation of final branched dendrites. The current solid-iquid interface reaction has been extended to the synthesis of CuS micro-pine dendrites with copper foil and sulfur powder as reaction reagents