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[摘要]：Uniform Cu2S nanodisks have been synthesized from a well-characterized layered copper thiolate precursor by structure-controlling solventless thermolysis at 200-220癈 under a N2 atmosphere. The development from small Cu2S nanoparticles (diam. u3 nm) to nanodisks (diam. 8.3 nm) and then to faceted nano-disks (diam. 27.5 nm, thickness 12.7 nm) is accompanied by a continuous phase transition from metastable orthorhombic to monoclinic Cu2S, the ripening of small particles by aggregation, and finally the crystn. process. The growth of the nanoproduct is constrained by the crystal structure of the precursor and the in situ-generated thiol mols. Such controlled anisotropic growth leads to a nearly const. thickness of faceted nanodisks with different diams., which has been confirmed by TEM observations and optical absorption measurements. |
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