Preparation, Study Of ZnS Nanocrystals As Enhanced Raman Scattering Substrates

This thesis presents an hydrothermal synthesis method for preparation ZnS,Mn-doped,Cu-doped ZnS nanocrystalline quantum dots and then applied it to beenhanced Raman scattering substrates. Their optical properties and the microscopiccrystal structure were investigated by auxiliary characterization.We observed surfaceenhanced Raman scattering of adsorbate from ZnS quantum dots. We gave a reasonaltheoretical explanation for the phenomenon,secondly, Details are as follows: First, wesuccessfully prepared ZnS Nanocrystals.Secondly, the organic probing moleculeswere modified on the surface of ZnS to investigate the surface-enhanced Ramanscattering spectroscopy to explore the enhancement mechanism of SERS. With theoptical and morphological characterization system we try to give an explaination forthe ZnS as a surface enhanced Raman scattering substrate. We believe that such in asystem (ZnS-molecule), the charge transfer between the semiconductor and molecularresonance enhanced Raman scattering system is a major contribution. Surface defectstate of semiconductor nanomaterials will partially produce an effect on the SERSactivity of determinand. Subsequently, we have successfully prepared differentconcentration of Mn doped ZnS Nanocrystals, and investigated Mn: ZnSnanocrystalline optical and morphological characterization. Then to explore theenhancement mechanism of semiconductor materials and adsorbed molecular, finallyto broaden the range of SERS-active substrate.