Sen, Riti
(2024)
Synthesis, Structure and Properties of Copper Selenide Based Nanoheterostructures.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
This dissertation highlights the design of colloidal metal-semiconductor heterostructures, starting from plasmonic, cost-effective and earth abundant semiconductor copper selenide nanoparticles. We first discuss the impact of reaction-insensitive parameter of lattice distortion of copper selenide, on the synthesis of binary metal-semiconductor NHSs, starting from copper selenide nanoparticles (Chapter 2). These results showed us that a system specific design rule can be established for the post-synthetic modification of copper-selenide nanoparticles, to predict if a metal-semiconductor interface will be formed or if competitive cation exchange reactions and metal diffusion would generate multi-metallic semiconductor nanoparticles. Next, we demonstrate how the design rule based on the reaction-insensitive lattice distortion parameter is preserved for the ternary and quaternary metal-metal chalcogenide syntheses; with some heterogeneities in the morphology of complex heterostructures formed (Chapter 3). Taken together, the work in these two chapters give us a basis for designing complex heterostructures, which are important for the downstream applications and synergistic properties discussed in Chapter 1. We then studied the effect of surface ligand on the morphology of metal deposition of gold and platinum on the surface of copper selenide. We found the deposition morphology is uniquely insensitive to several characteristics of the surface chemistry of copper selenide, except for the cooperative dissociation of quaternary ammonium bromide ligands from the NP surface (Chapter 4). Lastly, we established some fundamental plasmonic parameters of copper selenide nanoparticles with various capping ligands, such as extinction coefficient and refractive index sensitivity (Chapter 5).
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| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
27 August 2024 |
| Date Type: |
Publication |
| Defense Date: |
11 June 2024 |
| Approval Date: |
27 August 2024 |
| Submission Date: |
5 August 2024 |
| Access Restriction: |
2 year -- Restrict access to University of Pittsburgh for a period of 2 years. |
| Number of Pages: |
256 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Nanoparticles, Nanoscience, Materials Chemistry, Copper Selenide, Cation Exchange, Metal Deposition |
| Date Deposited: |
27 Aug 2024 13:04 |
| Last Modified: |
27 Aug 2024 13:04 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/46686 |
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