Document Type

Thesis

Date of Degree Completion

Spring 2014

Degree Name

Master of Science (MS)

Department

Chemistry

Committee Chair

Dion Rivera

Second Committee Member

Anthony Diaz

Third Committee Member

Yingbin Ge

Abstract

ZnS/ZnO semiconductor nanoparticles have been synthesized with L-cysteine and sodium polyphosphate capping agents using a colloidal synthesis method. The nanoparticles were characterized through the use of fluorescence spectroscopy, ultraviolet/visible (UV /Vis) spectroscopy, and X-ray diffraction (XRD) instrumentation. Introduction of oxygen during the synthesis reaction increases the intensity of the nanoparticle fluorescence and causes a blue shift in emissions which becomes more pronounced with longer exposure to oxygen. Growth of the ZnO shell around the ZnS particles alters the composition from a ZnS nanoparticle to a ZnS/ZnO nanoparticle as seen by an increase in absorbance from 350nm to 450nm which indicates ZnO formation.

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