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Description:: This dissertation explores ways to utilize physical parameters at the nanoscale interface to control the properties of mixed-dimensional heterojunctions (MDHJs). MDHJs combine the desirable properties of different classes of low-dimensional nanomaterials (materials that are quantum confined in at least one dimension). While MDHJs have achieved superlative performance for a variety...
Keyword:: photophysics, mixed-dimensional, low-dimensional, time-resolved spectroscopy, and nanomaterials
Subject:: Physical chemistry, Nanoscience, and Materials Science
Creator:: Padgaonkar, Suyog
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 10/07/2021
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_827806 and http://dissertations.umi.com/northwestern:15611

Description:: This dissertation examines the effects of phase transfers with thiol ligands on the optical properties of quantum dots (QDs) in water by investigating two systems: i) dihydrolipoic acid (DHLA)-capped PbS QDs and ii) thiolated DNA-capped core/shell CdSe/CdS QDs. QDs are bright, monodisperse, and tunable hydrophobic nanoparticles with high photoluminescence (PL)...
Keyword:: phase transfer, energy transfer, fractals, aggregation, and quantum dots
Subject:: Physical chemistry and Nanoscience
Creator:: Schwabacher, James Ciro
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/01/2021
Date Created:: 2020-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_753463 and http://dissertations.umi.com/northwestern:15179

Description:: Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique that can detect single molecules and simultaneously obtain structural information. When an analyte molecule binds to a nanostructured noble metal surface, the otherwise weak normal Raman signal is enhanced by as much as a factor of 108. This makes SERS the...
Keyword:: Surface-Enhanced Raman Spectroscopy and single molecule spectroscopy
Subject:: Physical chemistry and Nanoscience
Creator:: Wong, Nolan Log-chi
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14406 and etdadmin_upload_617842

Description:: This thesis describes a series of fundamental studies that address the role of electrostatic interactions in modulating i) the permeability of the ligand shell of a colloidal quantum dot (QD) to an anionic redox probe; ii) the resulting yield of photoinduced electron exchange within the QD ‒ redox probe complex;...
Keyword:: electrostatic interactions, surface chemistry, quantum dots, and optical spectroscopy
Subject:: Physical chemistry, Nanoscience, and Materials Science
Creator:: He, Chen
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_613994 and http://dissertations.umi.com/northwestern:14389

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