Sandwich-like Cu _(1.94)S-ZnS-Cu _(1.94)S nanoheterostructure: Structure, formation mechanism and localized surface plasmon resonance behavior

摘要

In this communication, a thermolysis route is developed to synthesize novel Cu _(1.94)S-ZnS-Cu _(1.94)S nanoheterostructures with interesting sandwich-like architectures, taking Cu _(1.94)S nanoplates as precursors. Evidently, the trimeric nanostructure is formed by a three-stage process, which includes the Zn-oleate induced assembling of Cu _(1.94)S nanoplate couples, the heteronucleation and growth of a ZnS layer between two Cu _(1.94)S plates dominated by interfacial diffusion, and the catalyst assisted axial growth of ZnS nanorod following the solution-liquid-solid mechanism. With epitaxial growth of ZnS nanocrystal between two Cu _(1.94)S nanoplates, the localized surface plasmon resonance frequency of Cu _(1.94)S shifts from 1875 to 1323nm, indicating that this new material is potentially applicable as a light absorbing agent in laser photothermal therapy. The reported growth mechanism may provide new strategies for designing and fabricating various technologically important polymeric nanoheterostructures.