Browsing RPI Theses Online (Complete) by Author "Gall, Daniel"
Now showing items 21-40 of 53
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Electron scattering at transition metal surfaces and grain boundaries
Jog, Atharv (Rensselaer Polytechnic Institute, Troy, NY, 2022-07)Electron transport in the mesoscopic regime is of great interest to the academic community and the semiconductor industry as a fundamental understanding of conduction in narrow wires is essential for the continued downscaling ... -
Electronic and quantum transport properties of metallic and semiconducting nanowires
Simbeck, Adam J. (Rensselaer Polytechnic Institute, Troy, NY, 2014-08)Since graphene nanoribbons with pristine edges are experimentally challenging to fabricate, the role of defects is also considered here. Using first-principles density functional theory methods, the role of a two atom edge ... -
Electronic transport in CrN and related alloys
McGahay, Mary (Rensselaer Polytechnic Institute, Troy, NY, 2020-12)A possible metal-insulator transition in the Cr1-xAlxN alloy system was explored using electronic transport and optical measurements on epitaxial Cr1-xAlxN(001)/MgO(001) layers which form a cubic solid-solution rock salt ... -
Epitaxial growth and properties of transition metal carbide thin films
Fang, Peijiao (Rensselaer Polytechnic Institute, Troy, NY, 2021-12)Transition metal carbides and nitrides are of broad interest due to their thermal stability, chemical inertness, metallic to semiconducting conductivity, high hardness and wear resistance. In the past decades, transition ... -
Epitaxy and characterization of cubic GaN and Ga₁₋ₓInₓN on micropatterned Si (001)
Durniak, Mark T. (Rensselaer Polytechnic Institute, Troy, NY, 2016-08)A reduction in the size of unwanted polycrystalline GaN grains was achieved by growth at high nitrogen to gallium (V/III) ratios without affecting cubic GaN nucleation. Grain sizes decreased from 0.5 to 0.02 µm² as the ... -
Epitaxy and microstructure of a- and c-plane GaInN on Ni-self-assembled nanopatterned templates
Bross, Adam S. (Rensselaer Polytechnic Institute, Troy, NY, 2017-05)Light-emitting diodes (LEDs) hold great promise for lighting because of their capability to efficiently convert electricity to light. Near 90% efficiency has been achieved for GaN-based LEDs emitting 440 nm blue light. ... -
First-principles investigations of electron scattering at surfaces and grain boundaries in nanoscale metallic conductors
Zhou, Tianji (Rensselaer Polytechnic Institute, Troy, NY, 2018-08)Surface roughness effects are analytically and computationally investigated by modeling electron reflection at discrete step edges. A Landauer formalism for incoherent scattering leads to a parameter-free expression for ... -
Growth and properties of semiconducting transition-metal nitride layers
Wang, Baiwei (Rensselaer Polytechnic Institute, Troy, NY, 2020-08)In addition to ternary nitride, (Ti0.5Mg0.5)1−xAlxN is used as a model system to explore and demonstrate the tunability of both the bandgap and the strain state in rocksalt structure quaternary nitride semiconductors. ... -
High field nonlinear resistive SiC, ZnO-based silicone rubber composites for cable field grading : mechanism(s), properties and filler treatment
Wang, Xiaoping (Rensselaer Polytechnic Institute, Troy, NY, 2009-12) -
In situ transmission electron microscopy of high-temperature inconel-625 corrosion by molten chloride salts
Pragnya, Prachi (Rensselaer Polytechnic Institute, Troy, NY, 2021-12)High-temperature corrosion of molten salt containment materials is of great significance for thermal energy storage systems that are used in concentrated solar power plants (CSP). Mitigating this corrosion is critical for ... -
Manipulating electronic and mechanical properties at metal-ceramic interfaces with a nanomolecular layer
Kwan, Matthew P. (Rensselaer Polytechnic Institute, Troy, NY, 2017-08)This work demonstrates that inserting nanomolecular layers (NMLs) can profoundly change and/or lead to novel electronic and mechanical properties of metal-ceramic interfaces. The first set of results demonstrate that ... -
Modeling thermally-driven microstructure evolution in nanocrystalline materials
Chen, Zhanyang (Rensselaer Polytechnic Institute, Troy, NY, 2018-08)Solute mobility is limited in the W-based system (W-Zn for a grain boundary segregated system and W-Cr for a duplex alloy) and is relatively high in the Fe based system (Fe-Zn for a grain boundary segregated system and ... -
Nanoscale techniques for investigating material issues in quantum dot based nanoelectronics
Balasubramanian, Ganapathi Prabhu Sai (Rensselaer Polytechnic Institute, Troy, NY, 2014-08)Raman measurements from the Si-FIB and the Si-broad beam implants in their as-implanted states show a decrease in Raman peak height, and an increase in peak shift, with dose, implying greater structural damage and stress ... -
Nanostructure design by atomic shadowing
Zhou, Chunming (Rensselaer Polytechnic Institute, Troy, NY, 2007-12) -
Novel polyelectrolyte complex based carbon nanotube composite architectures
Razdan, Sandeep (Rensselaer Polytechnic Institute, Troy, NY, 2008-05) -
Observations of aluminum pit initiation using in situ liquid cell transmission electron microscopy
Pinkowitz, Ainsley Caitlyn Shelburne (Rensselaer Polytechnic Institute, Troy, NY, 2018-12)Pit initiation has been observed with respect to the underlying metal microstructure. The experimentally observed pit location of several hundred pits with respect to the nearest grain boundary is compared to the expected ... -
Optically functional structures on GaN-based light-emitting diodes for light-extraction efficiency enhancement and emission pattern control
Ma, Ming (Rensselaer Polytechnic Institute, Troy, NY, 2013-05)In this dissertation, we present a technique that provides full control of refractive index and surface structure at the LED surface: LEDs having patterned graded-refractive-index (GRIN) coatings (GRIN LEDs). Micro-patterned ... -
Particle generation by pulsed excimer laser ablation in liquid: hollow structures and laser-induced reactions
Yan, Zijie (Rensselaer Polytechnic Institute, Troy, NY, 2011-05) -
Phase stability, structural and mechanical properties of transition metal nitrides using first principles calculations
Balasubramanian, Karthik (Rensselaer Polytechnic Institute, Troy, NY, 2018-05)The focus of this thesis is on understanding the phase stability as well as the structural and mechanical properties of transition metal nitrides using first principles calculations including detailed studies on (i) the ... -
Physical-chemical interactions at metal/low-k dielectric interfaces
Achanta, Ravi S. (Rensselaer Polytechnic Institute, Troy, NY, 2008-05)