Off-campus Michigan Tech users: To download campus access theses or dissertations, please use the following button to log in with your Michigan Tech ID and password: log in to proxy server
Non-Michigan Tech users: Please talk to your librarian about requesting this thesis or dissertation through interlibrary loan.
Date of Award
2022
Document Type
Campus Access Dissertation
Degree Name
Doctor of Philosophy in Physics (PhD)
Administrative Home Department
Department of Physics
Advisor 1
Dongyan Zhang
Advisor 2
Yoke Khin Yap
Committee Member 1
Ranjit Pati
Committee Member 2
Smitha Rao
Committee Member 3
John Jaszczak
Abstract
The popularity of boron nitride nanomaterials for their application in areas like electronics, photovoltaic, biomedical, automobile, and so on has increased in the recent era. Some unique properties make BNNTs outstanding for biomedical and photovoltaic applications, such as their optical transparency, electrical insulation, and biological compatibility. Hence large-scale synthesis of high-purity small-diameter BNNTs is required. On the other hand, research on the origin of excitation-dependent fluorescence (EDF) in BN dots is in its infancy. So, in this dissertation, we studied the growth mechanism of high-purity BNNTs with diameters smaller than 30nm. Additionally, we synthesized two different types of BN dots [sonication-assisted solvothermal (ss) BN dots and liquid nitrogen (LN) exfoliated BN dots], and studied their fluorescent properties. For the first time, we exploited the EDF property of the ss BN dots for solar cells. Here, we define ss BN dots as a pseudo-core/shell structure of DMA-CO and BN nanosheets and use them as the solar absorber (active layers, AL) to yield an efficiency of 1.51%. Our work is the first demonstration using biological and environmentally friendly colloidal nanomaterials for solar cells. In addition, we determined, for the first time, the biocompatible doses of ss BN dots for use in live HeLa cells. We found ss BN dots are suitable for live cell staining at doses below <10mg/mL for four consecutive days. We further investigated the photophysical properties of ss BN dots as fluorescent probes. We also demonstrated bright fluorescent staining of live HeLa cells using high-brightness fluorophores (HBFs) produced by our collaborators based on BN dots.
Recommended Citation
Sharma, Sambhawana, "BORON NITRIDE NANOSTRUCTURES: SYNTHESIS, CHARACTERIZATION, AND APPLICATION IN PHOTOVOLTAICS AND BIOMEDICINE", Campus Access Dissertation, Michigan Technological University, 2022.