Patrick McGary and Beth Stadler - Dr. Alison B. Flatau PDF
Preview Patrick McGary and Beth Stadler - Dr. Alison B. Flatau
Electroplating of Galfenol and the Evolution of Alloy Stoichiometry in Galfenol Nanowires with Growth Length Patrick McGary and Bethanie J.H. Stadler Department of Electrical and Computer Engineering University of Minnesota Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler Roadmap (cid:190) Motivation: Artificial Cilia Transducers (cid:190) Background: Alumina Nanopore Template Fabrication (cid:190) Electrodeposition of Galfenol (cid:131) Hull Cell Deposition and Characterization (cid:131) Potentiostatic Thin Film Deposition (cid:131) Potentiostatic Nanowire Deposition (cid:190) Conclusion Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler A Model Acoustic Sensor Cilia from inner ear cell Cilia from outer ear cell Cilia from our lab! Yost and Nelson Fundamentals of Hearing Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler Artificial Cilia Transducers (ACTs) Acoustic Waves Anodic Alumina Matrix Patterned Giant Magnetostrictive Magnetoresistance Nanowires of Sensors Varying Lengths High-bandwidth application will use fibers with varied resonant frequencies or a variable resonant chamber to produce high spatial resolution (eg: for underwater cameras). Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler (cid:190) Motivation: Artificial Cilia Transducers (cid:190) Alumina Nanopore Templates Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler Alumina Templates Side View Schematic Commercially Available Grown in our lab Pore diameter/spacing controllable via anodization conditions Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler AAO Cross-sections: Commercial vs. Homemade (a) 150-350 nm pore diameter Whatman® AnodiscTM AAO template at 40,000X magnification (b) 40 nm AAO template fabricated with the two-step anodization showing more uniform channels at 43,000X Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler Nanowire Fabrication Procedures (a) (b) (c) (d) Alumina Bulk Al Aluminum 1st Anodization Oxide Removal 2nd Anodization Electropolishing (e) Alumina (f) (g) Alumina (h) Alumina Aluminum Barrier Layer Sputter Electrical Electrodeposit Removal Removal Contact Nanowires Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler (cid:190) Motivation: Artificial Cilia Transducers (cid:190) Alumina Nanopore Template Fabrication (cid:190) Electrodeposition of Galfenol Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler Electrochemical Deposition of Nanowires V ref (cid:153) Fabrication Process R D • Sputter contact on V V the back in working side of porous I R ++ -- D D template • Insulate contact • 3 Electrode Working ++ -- potentiostatic ++ -- Electrode Counter ++ ++ -- -- ++ ++ GGaa33++ -- -- ++ ++ -- -- (Sample) electrodeposition Electrode ++ ++ -- -- ++ ++ -- -- ++ ++ -- -- (Pt) Electrolyte contains ++ ++ -- -- (cid:153) ++ ++ FFee22++ -- -- Brett and Brett, ++ -- ++ -- metal sulfate and Electrochemistry:Principles E , Methods, and boric acid or other Applications, Oxford UP, additives New York, 1993, p 146. Reference Electrode (Ag+/AgCl) • pH ~2-7 Electrical and Computer Engineering Patrick McGary www.ece.umn.edu/users/stadler
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