Date of Award
Open Access Dissertation
John R. Regalbuto
The goal of this work is to demonstrate the capabilities of benchtop Bragg diffraction in characterizing ultra-small (< 2nm) nanoparticles. To this end we have established a method for accurately separating the background, adjusting for relevant intensity effects, and analyzing the results with Rietveld refinement. This method is applied to the characterization of six silica-supported “noble” metals under ambient conditions: Pt, Pd, Ir, Rh, Ru, and Au. Surprisingly, Bragg diffraction is capable of shining light on this difficult-to-characterize size region – revealing the propensity of these metal nanoparticles to oxidize at room temperature. Preliminary findings for future work are also discussed: extending our method to crystalline supports and fluorescent samples.
Lipp, J. W.(2021). Fine Points for Broad Bumps: The Extension of Rietveld Refinement for Benchtop Powder XRD Analysis of Ultra-Small Supported Nanoparticles. (Doctoral dissertation). Retrieved from https://scholarcommons.sc.edu/etd/6752