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Lecture 1

CHEM 451 Lecture Notes - Lecture 1: Epitaxy, Lead, Nanometre

Course Code
CHEM 451
Nikolay Dimitrov

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Kinetic and Thermodynamic Aspects of Thin Film Growth
Controlled defect interactions on the thin-film growth modes taking place at
electrode / electrolyte interface
learn how to manipulate growth parameters such that layer-by-layer or self-
organized islanding growth becomes the kinetically preferred growth mode
two approaches for epitaxial thin film growth
electrochemical defect-mediated growth relies on co-deposition of the metal
of interest with a reversibly deposited mediator metal
surfactant-mediated growth exploits the ability of a pre-deposited monolayer
fraction of a "surfactant" metal to float on the surface of the depositing
metal thereby facilitating the interlayer transport in the course of growth
new method for epitaxial growth by Surface Limited Redox replacement
based upon multiple application of a "building block" deposition event
consisting of decoupled potential-controlled deposition of "sacrificial"
monolayer of metal U (U = Tl, Cd, Pb and Bi) and electroless redox
replacement of this layer by more-noble metal ions Gz+ (G = Ag+, Au3+, Pt2+,
Pd2+ and Cu2+)
this strategy for metal thin film deposition. Proof-of-concept experiments
employing the replacement of Pb sacrificial layers for the growth of Ag and
Cu on Au (111) validated SLRR as a viable pathway toward the deposition of
stoichiometrically adequate number of epitaxial monolayers with perfectly
uniform surface morphology and thickness controlled in the sub-nanometer
employed for controlled deposition of thin alloy films and metal multilayers
aimed at final applications in hydrogen catalysis and electronic industry
applicability of SLRR to systems of practical interest and served as a road
map to further interdisciplinary projects associated with application in the
design of new catalysts and their testing in fuel cell and battery applications
Chemical and Electrochemical Processing of Nanoscale Materials
De-alloying or selective alloy dissolution is a solid-state separation process is
selective removed from the system
formation of a nanoporous structure composed almost entirely of the more-
noble alloy constituents
to design a variety of porous structures at nanometer length scales
Key points of interest are associated with both
the transition from nucleated clusters/ligaments to 3D porosity structure
the limitations in the growth evolution of the porous layer in vertical
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