Shawn S Coffee

Shawn S Coffee

Tucson, Arizona, United States
3K followers 500+ connections

About

Engineer adept at learning technology, tackles big complex projects and conquers the…

Articles by Shawn S

  • Technology Review: Artificial Intelligence

    This article is an ongoing review series investigating the many new technologies being pushed by start ups and big…

  • Suggestion to LinkedIn

    LinkedIn is an excellent networking social network with the intention of furthering individual careers and businesses…

    2 Comments
  • Technology Reviews

    Technology is in the news these days with start up hotbeds like Silicon Valley, Austin, Boston, Seattle and other hubs…

  • Beating the Boolean

    LinkedIn has become the premier social network for professional networking and talent recruitment in most industries…

  • Uncertain Future

    As time moves forward into the future, unexpected events happen both good and bad. This is the nature of our existence.

  • Informed Leadership

    Good leadership has many attributes as countless articles on LinkedIn will attest concerning a good leader. One can…

    1 Comment
  • Two kinds of people....

    Everywhere one looks there are various metrics to measure people. This extends from their personality (Myers-Briggs) to…

    3 Comments
  • Wisdom Signs - Sizing up your Opponent

    There is always significant amount of discuss concerning smart and hard working people. Intelligence is raw brain…

  • Cult of Wishful Thinking

    It is often mentioned that the US as a country has become over optimistic leading to serious societal problems. I…

  • Information

    One new business area that has been growing within the last few years by leaps and bounds has been Big Data. The…

Activity

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Experience

  • Raytheon Graphic
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    Tucson, Arizona, United States

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    Tucson, AZ

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    Tucson, Arizona Area

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    Tucson, Arizona Area

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    Richardson, TX

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    Dallas, TX

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    Austin, Texas Metropolitan Area

Education

  • The University of Texas at Austin Graphic

    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

  • RTX Program Manager Level 6 Graphic

    RTX Program Manager Level 6

    RTX

    Issued
  • Control Account Manager (CAM) Graphic

    Control Account Manager (CAM)

    RTX

    Issued
  • Engineering in Training (EIT)

    State of New Mexico

  • Raytheon Six Sigma Certification Graphic

    Raytheon Six Sigma Certification

    Raytheon

Publications

  • 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.

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  • 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.

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  • 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 authors
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Patents

  • 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 inventors
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  • Multi-variable Input Decision Determination for Flight Safety Systems

    Filed 19/278,384

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  • Integrated In-Line Additive Manufactured Explosive Payloads

    Filed 19/083,057

    Warhead designs fabricated through Additive Manufacturing including layer-by-layer manufacturing.

    Other inventors
  • Enhanced Modular Linear Shaped Jet Charges

    Filed 19/057,581

    Additive manufactured linear shaped charges enhanced with an internal wave shaper and novel booster.

    Other inventors

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