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Full-Text Articles in Nanoscience and Nanotechnology

Assembly Of Dithiocarbamate-Anchored Monolayers On Gold Surfaces In Aqueous Solutions, Heng Zhu, Donna Coleman, Christopher Dehen, Iris Geisler, Dmitry Zemlyanov, Jean Chmielewski, Garth Simpson, Alexander Wei Mar 2012

Assembly Of Dithiocarbamate-Anchored Monolayers On Gold Surfaces In Aqueous Solutions, Heng Zhu, Donna Coleman, Christopher Dehen, Iris Geisler, Dmitry Zemlyanov, Jean Chmielewski, Garth Simpson, Alexander Wei

Dmitry Yurievich Zemlyanov

Dithiocarbamates (DTCs) can be formed by the in situ condensation of polar alkylamines with CS2, and assembled into dithiocarbamate-anchored monolayers (DAMs) on Au substrates in aqueous solutions. Primary and secondary amines can both be used to prepare DTCs, but have significant differences in their reactivities and product stabilities. Ultraviolet absorption spectroscopy provides a convenient method for monitoring in situ DTC formation as well as the formation of potential byproducts. The kinetics of DAM assembly on An substrates as measured by second harmonic generation (SHG) indicated first-order rate processes and saturation coverages similar to those of alkanethiols on Au. However, the ...


Adsorption Of Amino Acids On Indium Arsenide (100) Surfaces: Assessment Of Passivation Capabilities, John Slavin, Dmitry Zemlyanov, Albena Ivanisevic Mar 2012

Adsorption Of Amino Acids On Indium Arsenide (100) Surfaces: Assessment Of Passivation Capabilities, John Slavin, Dmitry Zemlyanov, Albena Ivanisevic

Dmitry Yurievich Zemlyanov

Angle-Resolved X-ray Photoelectron Spectroscopy (ARXPS) was used to examine amino acid bonding and oxide removal on InAs(100) surfaces. Five amino acids were studied, including cysteine, lysine, aspartic acid, glutamic acid and arginine. Observations on the ability of specific functional groups to prevent oxide formation were made by examining the thickness of oxide films on the functionalize surfaces. Amino acids that possessed more than one functional group having resonance were shown to most effectively affect oxide formation. The influence of these groups on the electronic structure of InAs(100) provides insight into how multifunctional passivation strategies could be beneficial, as ...