Matching Items (30)
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- All Subjects: Piano music
- All Subjects: Materials Science
- All Subjects: Clarinet and piano music
- Creators: Hamilton, Robert, 1937-
Description
Silicon nanowires were grown epitaxially on Si (100) and (111) surfaces using the Vapor-Liquid-Solid (VLS) mechanism under both thermal and plasma enhanced growth conditions. Nanowire morphology was investigated as a function of temperature, time, disilane partial pressure and substrate preparation. Silicon nanowires synthesized in low temperature plasma typically curved compared to the linear nanowires grown under simple thermal conditions. The nanowires tended bend more with increasing disilane partial gas pressure up to 25 x10-3 mTorr. The nanowire curvature measured geometrically is correlated with the shift of the main silicon peak obtained in Raman spectroscopy. A mechanistic hypothesis was proposed to explain the bending during plasma activated growth. Additional driving forces related to electrostatic and Van der Waals forces were also discussed. Deduced from a systematic variation of a three-step experimental protocol, the mechanism for bending was associated with asymmetric deposition rate along the outer and inner wall of nanowire. The conditions leading to nanowire branching were also examined using a two-step growth process. Branching morphologies were examined as a function of plasma powers between 1.5 W and 3.5 W. Post-annealing thermal and plasma-assisted treatments in hydrogen were compared to understand the influences in the absence of an external silicon source (otherwise supplied by disilane). Longer and thicker nanowires were associated with longer annealing times due to an Ostwald-like ripening effect. The roles of surface diffusion, gas diffusion, etching and deposition rates were examined.
ContributorsJoun, Hee-Joung (Author) / Petuskey, William T. (Thesis advisor) / Drucker, Jeff (Committee member) / Chizmeshya, Andrew (Committee member) / Arizona State University (Publisher)
Created2011
Description
The overall objective of this project is to optimize the development of magnetic ferrite thin films targeted for enabling low-loss broadband communication devices, miniaturized low-microwave inductors and electromagnetic noise suppressors. The focus of this objective is to design and build a reactor and improve the spin-spray process. Each film is then characterized and optimized to have a high permeability and high frequency in the range of 500 MHz - 3 GHz. Films produced by the µ-droplet deposition regime yields a higher Snoek's product than the continuous liquid layer regime. The highest Snoek's product occurs when it is deposited at an oxidant pH of 8.28. The Ni-Zn-Co ferrite magnetic domains were imaged using the Lorentz TEM in which multi-grain domains are experimentally observed for the first time.
ContributorsRay, Nicole M (Author) / Petuskey, William T. (Thesis advisor) / Diaz, Rodolfo E. (Committee member) / Chamberlin, Ralph V. (Committee member) / Arizona State University (Publisher)
Created2013
ContributorsHamilton, Robert, 1937- (Performer) / Gebe, Vladimir, 1987- (Performer) / Spring, Robert (Performer) / ASU Library. Music Library (Publisher)
Created2018-10-25
ContributorsCarey, Nicholas (Performer) / Hamilton, Robert, 1937- (Performer) / ASU Library. Music Library (Publisher)
Created1998-10-25
ContributorsHamilton, Robert, 1937- (Performer) / ASU Library. Music Library (Publisher)
Created1996-10-04
ContributorsHamilton, Robert, 1937- (Performer) / Pagano, Caio, 1940- (Performer) / FitzPatrick, Carole (Performer) / Ryan, Russell (Performer) / ASU Library. Music Library (Publisher)
Created2011-10-21
ContributorsSpring, Robert (Performer) / Hamilton, Robert, 1937- (Performer) / Hur, Jiyoun (Performer) / Schuring, Martin (Performer) / Micklich, Albie (Performer) / Gardner, Joshua (Performer) / Creviston, Christopher (Performer) / Rotaru, Catalin (Performer) / Smith, J. B., 1957- (Performer) / Alpizar, Mark (Conductor) / ASU Library. Music Library (Publisher)
Created2017-09-17
ContributorsHamilton, Robert, 1937- (Performer) / ASU Library. Music Library (Publisher)
Created1995-10-06
ContributorsHamilton, Robert, 1937- (Performer) / ASU Library. Music Library (Publisher)
Created1994-09-09
ContributorsHamilton, Robert, 1937- (Performer) / Smith, J. B., 1957- (Performer) / Fuller, Mark (Performer) / ASU Library. Music Library (Publisher)
Created2001-02-18