About
Engineer adept at learning technology, tackles big complex projects and conquers the…
Articles by Shawn S
Activity
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Retirement Day for me, Hanging up my Abbott hat today after 36 years working on the i-Stat Product line. Just want to say for all the folks I…
Retirement Day for me, Hanging up my Abbott hat today after 36 years working on the i-Stat Product line. Just want to say for all the folks I…
Liked by Shawn S Coffee
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I’m excited to share that I’ll be starting a new position as a Systems Engineer at Raytheon! After finishing up my degree at San Diego State…
I’m excited to share that I’ll be starting a new position as a Systems Engineer at Raytheon! After finishing up my degree at San Diego State…
Liked by Shawn S Coffee
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Maintenance is often overlooked and sidelined when making business decisions in #manufacturing. So how can companies leverage tools and technology…
Maintenance is often overlooked and sidelined when making business decisions in #manufacturing. So how can companies leverage tools and technology…
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Experience
Education
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The University of Texas at Austin
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Activities and Societies: University of Texas Sailing Club, Cooking Works
Completed both Doctor of Philosophy and Masters of Science degrees with emphasis in Materials Science and Surface Science.
Dissertation: Selective Silicon and Germanium Nanoparticle Deposition on Amorphous Surfaces
https://repositories.lib.utexas.edu/handle/2152/3181?show=full
Developed and fabricated novel organized germanium and silicon nanoparticle arrays on amorphous insulator surfaces utilizing self-assembling polymer masks. Calculated hot wire chemical vapor deposition…Completed both Doctor of Philosophy and Masters of Science degrees with emphasis in Materials Science and Surface Science.
Dissertation: Selective Silicon and Germanium Nanoparticle Deposition on Amorphous Surfaces
https://repositories.lib.utexas.edu/handle/2152/3181?show=full
Developed and fabricated novel organized germanium and silicon nanoparticle arrays on amorphous insulator surfaces utilizing self-assembling polymer masks. Calculated hot wire chemical vapor deposition kinetic rates through experiment and mean-field nucleation theory as a model.
• Oversaw Ekerdt group research laboratory during advisor’s sabbatical absence.
• Consistently received praises for operating and maintaining an ultra-high vacuum cluster chamber system.
• Instructed students through both verbal and written formats within the classroom environment.
• Launched innovative nanotechnology laboratory instruction.
• Trained and conducted R&D laboratory associates
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Licenses & Certifications
Publications
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Investigation of Volmer-Weber growth mode kinetics for germanium nanoparticles on hafnia
Journal of Applied Physics
Germanium nanoparticle deposition kinetics were investigated on extended HfO2 surfaces and HfO2 confined within features etched into a 12.5 nm SiO2 film. Electron beam lithography was used to pattern square features from 200 nm to100 μm in width. Hot wire chemical vapor deposition produced Ge nanoparticles on exposed HfO2 surfaces at 0.06–4.2 ML/min fluxes and 700–775 K surface temperatures. Using mean-field nucleation descriptions of particle density versus flux and temperature, a noninteger…
Germanium nanoparticle deposition kinetics were investigated on extended HfO2 surfaces and HfO2 confined within features etched into a 12.5 nm SiO2 film. Electron beam lithography was used to pattern square features from 200 nm to100 μm in width. Hot wire chemical vapor deposition produced Ge nanoparticles on exposed HfO2 surfaces at 0.06–4.2 ML/min fluxes and 700–775 K surface temperatures. Using mean-field nucleation descriptions of particle density versus flux and temperature, a noninteger critical cluster nuclei size between 0.27 and 0.4 was found, while the critical cluster formation activation energy of 0.4–0.6eV was estimated assuming a critical cluster size of zero for studies on extended, unpatterned HfO2. Restricting the HfO2 deposition area decreases nanoparticle density compared to the density found on extended surfaces. The density decrease is due to Ge desorption through adatom contact with the silica perimeter, which depletes the system of Ge adatoms that can undergo nucleation. Comparable activation energies for Ge desorption, surface diffusion, and cluster formation obscure the change with temperature an individual process rate has on nanoparticle growth characteristics as the feature size changes.
Other authorsSee publication -
Selective silicon nanoparticle growth on high-density arrays of silicon nitride
Journal of Crystal Growth
Selective silicon nanoparticle deposition from disilane on ∼17 nm diameter Si3N4 features defined through a 15-nm-thick SiO2 masking layer was studied using hot wire chemical vapor deposition between 900 and 1025 K, and chemical vapor deposition between 900 and 975 K. Thin film poly(styrene-b-methyl methacrylate) diblock copolymer was used to generate cylinders with a density of 6×1010 cm−2 that served as the patterning template. Silicon adatom etching of SiO2 and diffusion of adatoms to the…
Selective silicon nanoparticle deposition from disilane on ∼17 nm diameter Si3N4 features defined through a 15-nm-thick SiO2 masking layer was studied using hot wire chemical vapor deposition between 900 and 1025 K, and chemical vapor deposition between 900 and 975 K. Thin film poly(styrene-b-methyl methacrylate) diblock copolymer was used to generate cylinders with a density of 6×1010 cm−2 that served as the patterning template. Silicon adatom etching of SiO2 and diffusion of adatoms to the Si3N4 regions prevented the accumulation of adatoms necessary for nanoparticle nucleation and growth on the SiO2 surfaces. Nanoparticles form selectively on Si3N4, because adsorbed Si does not etch this surface. Incident flux, total exposure, and substrate temperature were adjusted to explore nanoparticle deposition trends relating relative adatom concentration with nanoparticle density and size distributions.
Other authorsSee publication -
Directed nucleation of ordered nanoparticle arrays on amorphous surfaces
Journal of Vacuum Science & Technology B
Germanium nanoparticle nucleation was studied in organized arrays on HfO2 using a SiO2 thin film mask with ∼20–24 nm pores and a 6×10^10 cm^−2 pore density. Poly(styrene-b-methyl methacrylate) diblock copolymer was employed to pattern the SiO2 film. Hot wire chemical vapor deposition at 800K produced Ge nanoparticles using 6–19 monolayer Ge exposures. By seeding adatoms on HfO2 at room temperature before growth, nanoparticle density is approximately one particle per pore.
Other authorsSee publication
Patents
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Ignition Safety Device for a Multi-Pulse or Multi-Stage Rocket Motor
Issued US 11,988,172 B2
Novel ignition safety device utilizing launcher inputs to optimize munition flight or speed according to measured distance to target.
Other inventorsSee patent
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Following a national search that began January 14, the New Mexico Tech Board of Regents today announced the appointment of Dr. Michael Jackson as the…
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Imagine being named Claude in 2026. Half your messages are mistakes… the other half are expectations.
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The carbon dioxide (CO2) scrubbers on the Artemis Orion spacecraft are designed to maintain cabin CO2 levels at a partial pressure of 3.0 mmHg…
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🚀 Waiving at you from sunny New Mexico Tech! 🌎 While conducting research for NASA, our MRO-2.4 telescope caught a glimpse of the Artemis II on its…
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BREAKING: The bipartisan Supersonic Aviation Modernization Act (SAMA) just passed the House UNANIMOUSLY and is headed to the Senate. Supersonic…
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The loudest people in the room say "alpha" The most effective ones? They are just a stable version that gives value.
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This interesting map shows the average land elevation of every state in the U.S.
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