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ASU Electronic Theses and Dissertations


This collection includes most of the ASU Theses and Dissertations from 2011 to present. ASU Theses and Dissertations are available in downloadable PDF format; however, a small percentage of items are under embargo. Information about the dissertations/theses includes degree information, committee members, an abstract, supporting data or media.

In addition to the electronic theses found in the ASU Digital Repository, ASU Theses and Dissertations can be found in the ASU Library Catalog.

Dissertations and Theses granted by Arizona State University are archived and made available through a joint effort of the ASU Graduate College and the ASU Libraries. For more information or questions about this collection contact or visit the Digital Repository ETD Library Guide or contact the ASU Graduate College at gradformat@asu.edu.


Subject
Date Range
2010 2019


Microfluidic systems have gained popularity in the last two decades for their potential applications in manipulating micro- and nano- particulates of interest. Several different microfluidics devices have been built capable of rapidly probing, sorting, and trapping analytes of interest. Microfluidics can be combined with separation science to address challenges of obtaining a concentrated and pure distinct analyte from mixtures of increasingly similar entities. Many of these techniques have been developed to assess biological analytes of interest; one of which is dielectrophoresis (DEP), a force which acts on polarizable analytes in the presence of a non-uniform electric fields. This method can …

Contributors
Crowther, Claire Victoria, Hayes, Mark A, Gile, Gillian H, et al.
Created Date
2018

The molecular modification of semiconductors has applications in energy conversion and storage, including artificial photosynthesis. In nature, the active sites of enzymes are typically earth-abundant metal centers and the protein provides a unique three-dimensional environment for effecting catalytic transformations. Inspired by this biological architecture, a synthetic methodology using surface-grafted polymers with discrete chemical recognition sites for assembling human-engineered catalysts in three-dimensional environments is presented. The use of polymeric coatings to interface cobalt-containing catalysts with semiconductors for solar fuel production is introduced in Chapter 1. The following three chapters demonstrate the versatility of this modular approach to interface cobalt-containing catalysts with …

Contributors
Beiler, Anna Mary, Moore, Gary F., Moore, Thomas A., et al.
Created Date
2018

The physiological phenomenon of sensing temperature is detected by transient receptor (TRP) ion channels, which are pore forming proteins that reside in the membrane bilayer. The cold and hot sensing TRP channels named TRPV1 and TRPM8 respectively, can be modulated by diverse stimuli and are finely tuned by proteins and lipids. PIRT (phosphoinositide interacting regulator of TRP channels) is a small membrane protein that modifies TRPV1 responses to heat and TRPM8 responses to cold. In this dissertation, the first direct measurements between PIRT and TRPM8 are quantified with nuclear magnetic resonance and microscale thermophoresis. Using Rosetta computational biology, TRPM8 is …

Contributors
Sisco, Nicholas John, Van Horn, Wade D, Mills, Jeremy H, et al.
Created Date
2018

The work described in this thesis explores the synthesis of new semiconductors in the Si-Ge-Sn system for application in Si-photonics. Direct gap Ge1-ySny (y=0.12-0.16) alloys with enhanced light emission and absorption are pursued. Monocrystalline layers are grown on Si platforms via epitaxy-driven reactions between Sn- and Ge-hydrides using compositionally graded buffer layers that mitigate lattice mismatch between the epilayer and Si platforms. Prototype p-i-n structures are fabricated and are found to exhibit direct gap electroluminescence and tunable absorption edges between 2200 and 2700 nm indicating applications in LEDs and detectors. Additionally, a low pressure technique is described producing pseudomorphic Ge1-ySny …

Contributors
Wallace, Patrick Michael, Kouvetakis, John, Menendez, Jose, et al.
Created Date
2018

Engineered nanoparticles (NPs) pose risk potentials, if they exist in water systems at significant concentrations and if they remain reactive to cause toxicity. Three goals guided this study: (1) establishing NP detecting methods with high sensitivity to tackle low concentration and small sizes, (2) achieving assays capable of measuring NP surface reactivity and identifying surface reaction mechanisms, and (3) understanding the impact of surface adsorption of ions on surface reactivity of NPs in water. The size detection limit of single particle inductively coupled plasma spectrometry (spICP-MS) was determined for 40 elements, demonstrating the feasibility of spICP-MS to different NP species …

Contributors
Bi, Xiangyu, Westerhoff, Paul K, Rittmann, Bruce E, et al.
Created Date
2018

Biological systems have long been known to utilize two processes for energy conservation: substrate-level phosphorylation and electron transport phosphorylation. Recently, a new bioenergetic process was discovered that increases ATP yields: flavin-based electron bifurcation (FBEB). This process couples an energetically favorable reaction with an energetically unfavorable one to conserve energy in the organism. Currently, the mechanisms of enzymes that perform FBEB are unknown. In this work, NADH-dependent reduced ferredoxin:NADP+ oxidoreductase (Nfn), a FBEB enzyme, is used as a model system to study this phenomenon. Nfn is a heterodimeric enzyme that reversibly couples the exergonic reduction of NADP+ by reduced ferredoxin with …

Contributors
Jennings, David, Jones, Anne K, Redding, Kevin E, et al.
Created Date
2018

Time-resolved serial femtosecond crystallography is an emerging method that allows for structural discovery to be performed on biomacromolecules during their dynamic trajectory through a reaction pathway after activation. This is performed by triggering a reaction on an ensemble of molecules in nano- or microcrystals and then using femtosecond X-ray laser pulses produced by an X-ray free electron laser to collect near-instantaneous data on the crystal. A full data set can be collected by merging a sufficient number of these patterns together and multiple data sets can be collected at different points along the reaction pathway by manipulating the delay time …

Contributors
Coe, Jesse, Fromme, Petra, Sayres, Scott, et al.
Created Date
2018

The fundamental photophysics of fluorescent probes must be understood when the probes are used in biological applications. The photophysics of BODIPY dyes inside polymeric micelles and rhodamine dyes covalently linked to proteins were studied. Hydrophobic boron-dipyrromethene (BODIPY) dyes were noncovalently encapsulated inside polymeric micelles. Absorbance and fluorescence measurements were employed to study the photophysics of these BODIPY dyes in the micellar environments. Amphiphilic polymers with a hydrophobic character and low Critical Micelle Concentration (CMC) protected BODIPYS from the aqueous environment. Moderate dye loading conditions did not result in ground-state dimerization, and only fluorescence lifetimes and brightnesses were affected. However, amphiphilic …

Contributors
Donaphon, Bryan Matthew, Levitus, Marcia, Van Horn, Wade, et al.
Created Date
2018

The larger tolerance to lattice mismatch in growth of semiconductor nanowires (NWs) offers much more flexibility for achieving a wide range of compositions and bandgaps via alloying within a single substrate. The bandgap of III-V InGaAsP alloy NWs can be tuned to cover a wide range of (0.4, 2.25) eV, appealing for various optoelectronic applications such as photodetectors, solar cells, Light Emitting Diodes (LEDs), lasers, etc., given the existing rich knowledge in device fabrication based on these materials. This dissertation explores the growth of InGaAsP alloys using a low-cost method that could be potentially important especially for III-V NW-based solar …

Contributors
Hashemi Amiri, Seyed Ebrahim, Ning, Cun-Zheng, Petuskey, William, et al.
Created Date
2018

Ultrasonication-mediated liquid-phase exfoliation has emerged as an efficient method for producing large quantities of two-dimensional materials such as graphene, boron nitride, and transition metal dichalcogenides. This thesis explores the use of this process to produce a new class of boron-rich, two-dimensional materials, namely metal diborides, and investigate their properties using bulk and nanoscale characterization methods. Metal diborides are a class of structurally related materials that contain hexagonal sheets of boron separated by metal atoms with applications in superconductivity, composites, ultra-high temperature ceramics and catalysis. To demonstrate the utility of these materials, chromium diboride was incorporated in polyvinyl alcohol as a …

Contributors
Yousaf, Ahmed, Green, Alexander A, Wang, Qing Hua, et al.
Created Date
2018