Document Type
Thesis
Date of Degree Completion
Spring 2009
Degree Name
Bachelor of Science
Department
Chemistry
Committee Chair
Dr. Dion Rivera, Department of Chemistry
Second Committee Member
Dr. Anthony Diaz, Department of Chemistry
Third Committee Member
Dr. Audrey D. Huerta, Director Science Honors Research Program
Abstract
Blue to green fluorescence is exhibited by zinc-based quantum dot (QD) materials capped with sodium polyphosphate and L-cysteine. The factors governing this final fluorescence and intensity were explored using kinetic studies. Fluorescence and absorption spectroscopy were used to monitor relative size of QDs and fluorescence intensity as a function of time. Fluorescence data shows gradual formation of an emission peak at 520 nm, and shows shifting of this emission peak to 480 nm over a 24 hr time period. Fluorescence results suggest that zinc oxide is forming on the surface of the ZnS nanocrystals and during early heating stages may be acting as a dopant withing the zinc-based nanoparticles. As the nanocrystalline material is heated over a 24 hr period spectroscopic data suggests that a shell of ZnO is forming around the ZnS nanocrystal.
Recommended Citation
Durkee, Heather, "Synthesis and Characterization of Zinc-Based Quantum Dot Materials with Blue to Green Fluorescence From an Aqueous-Based Synthetic Method" (2009). Undergraduate Honors Theses. 89.
https://digitalcommons.cwu.edu/undergrad_hontheses/89
Comments
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