Ryoo, Bo Hyung
(2019)
Influence of Phosphine and Halide Ligands on the Properties of Undecagold Nanoclusters.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Surface ligands are essential components of nanomaterial identity, as they passivate the surfaces of many nanomaterials. Traditionally, ligands were considered for their size- and shape- directing properties in nanoparticles. Besides their usage in syntheses to control the morphologies of the nanomaterials, various ligands were used in tuning the surface functionality of nanomaterials for many applications, ranging from drug targeting to nanosensors. Recently, identities of the surface ligands were found to influence nanomaterial chemical and physical properties, including enhancement of stability, catalytic behaviors, and photoluminescence. These old and new ligand- controllable properties (achieved by various ligand modification through synthetic organic chemistry routes) necessitate a fundamental understanding of the ligand effect on the nanomaterials. In order to take another stride towards having a fundamental understanding of the ligands on nanomaterials, we study influences of and halide ligands on undecagold nanoclusters (Au11NCs). With the small size, the suite of atomically precise Au11NCs is easily accessible synthetically and theoretically. In addition, the ligand influences are intensified due to having majority of the gold atoms oriented on the surface of Au11NCs interacting with surface molecules. Systematically altering the type and composition of the surface ligands, which are subsequently characterized and compared with the local and overall electronic structures of computationally modelled Au11NCs, provides critical information about the ligand’s role in nanomaterials. Further, several overarching theories are suggested to elucidate the influence of the ligand identities on the enhancement of photoluminescence properties in Au11NCs. From this work, the mechanisms underlying ligand influence on Au11NCs can be translated to commonly used, larger nanoparticles and in the design of next-generation applications of nanomaterials.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
26 September 2019 |
| Date Type: |
Publication |
| Defense Date: |
29 November 2018 |
| Approval Date: |
26 September 2019 |
| Submission Date: |
18 July 2019 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
258 |
| 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: |
Nano, Nanocluster, Photoluminescence, Gold, Ligands, CP2K |
| Date Deposited: |
26 Sep 2019 13:41 |
| Last Modified: |
26 Sep 2019 13:41 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/37132 |
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