[SpringerBriefs in Materials] Anisotropic Metal Chalcogenide Nanomaterials (Synthesis, Assembly, and Applications) || Synthesis and Assembly

摘要： The synthetic protocol for anisotropic MC nanocrystals has been developed based on accumulation of a largely empirical recipe, followed by inductive conclusion. Afterwards, the initial parameters are optimized to obtain the targeted nanostructures. The systematic synthetic effort is repeated and devised to inter-relate each parameter with a rational design of novel and complex MC through nanostructures. Normally, thermodynamically-controlled growth reflects the inherent symmetry of the crystal structure, hence 3D nanocrystals are readily obtained. Synthesis of nanocrystals that do not have any preferential growth direction requires purposeful shape-guiding. Reduction of the surface energy of a certain facet is a powerful way to obtain anisotropic MCs, which can be achieved by selectively attaching organic surfactants or using the organic templates as the shape-determining reactor. The MC nanocrystals can then be merged to form 1D or 2D nanostructures. Such oriented attachment can be tailored by engineering the interaction between the nanocrystals. Chemical transformation of pre-existing anisotropic nanocrystals into others has recently received a lot of interest because it allows preparation of nanocrystals that are chemically different but have the same shape and dimensions.