Kunzler, Karli
(2024)
Influence of Ligand Exchange on the Composition and Optoelectronic Performance of Small Bimetallic Nanoparticles.
Master's Thesis, University of Pittsburgh.
(Unpublished)
This is the latest version of this item.
Abstract
From machine gears to biofilms, surfaces influence almost every aspect of how materials interact with their environments. The amount of surface area per unit mass of a material changes dramatically as function of dimensionality. Therefore, it is no surprise that nanoscale materials (with dimensions between 1-100 nm) exhibit properties that can change dramatically based on their surface chemistry. However, for nanomaterials, surface chemistry not only influences emergent properties, it can also influence particle formation, structure, and stability. An important class of nanomaterials to study the impacts of surface chemistry are “small” (core diameter ~2nm) bimetallic nanoparticles. These particles have widespread use in catalytic transformations in addition to use in medical diagnostics and therapeutics. However, both the stoichiometry and atom position in these particles have significant influence on their downstream properties, and understanding how the surface ligands impacts their structure, stability, and emergent properties is critical. Here, we begin to uncover the influence of surface ligands on small bimetallic NPs by investigating how post-synthetic ligand exchange alters the inorganic core composition of small (core size = 1.9 0.3 nm) Au/Pd and Au/Cu bimetallic nanoparticles. We find that the process of mass action ligand exchange measurably modifies the inorganic core composition of Au/Pd and Au/Cu NPs. Further, we leverage this change in composition through post-synthetic modification to elucidate the influence of surface chemistry on the optoelectronic performance of Au/Cu bimetallic NPs. Taken together, these studies reveal the powerful role of surface chemistry on the composition, stability, and optoelectronic performance of small bimetallic NPs.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| Date: |
13 May 2024 |
| Date Type: |
Publication |
| Defense Date: |
2 August 2022 |
| Approval Date: |
13 May 2024 |
| Submission Date: |
4 April 2024 |
| Access Restriction: |
2 year -- Restrict access to University of Pittsburgh for a period of 2 years. |
| Number of Pages: |
88 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
bimetallic nanoparticles, ligand exchange, surface, noble metal, optoelectronic, composition, photoluminescence |
| Date Deposited: |
13 May 2024 13:50 |
| Last Modified: |
13 May 2024 13:50 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/46073 |
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Influence of Ligand Exchange on the Composition and Optoelectronic Performance of Small Bimetallic Nanoparticles. (deposited 13 May 2024 13:50)
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