In this paper, we describe a parts-to-substrate self-assembly approach driven by surface tension. To perform assembly, the substrates are prepared with hydrophobic gold patterns as binding sites. The binding sites are activated by adsorption of an alkanethiolate self-assembled monolayer (SAM), while they can be de-activated by electrochemical reductive desorption of the monolayer. Therefore, as...

Absrract This paper describes research in tw'o areas: heterogeneous catalysis and molecular self-asiembly. The work in heterogeneous catalysis used the platinum-catalyzed hydrogenation of diolefin(dialkyl)platinum(ll) complexes to generate platinum surface alkyls of known structure. The structure and rcactrvity of these surface alkyls were inferred from characteristic processes occurring on the...

High-resolution electron-energy-loss spectra of octadecanethiol self-assembled monolayers ~SAM’s! on Au thin films have been obtained after annealing the sample to various temperatures. Annealing to 375 K results in the appearance of the S-S stretch at 530 cm, a direct observation of sulfur dimers for alkanethiol SAM’s adsorbed on Au. The appearance of dimers following annealing is explained by...

Electron tunneling through self-assembled monolayers of alkanethiols is investigated. Temperature-dependent current– voltage measurements are performed to distinguish between di erent conduction mechanisms. Temperature-independent electron transport is observed, proving direct tunneling as the dominant conduction mechanism of alkanethiols. An exponential dependence of tunneling current on molec...

It was revealed that electrostatic forces between electrodes under the applied bias are almost completely suppressed by an electrochemical potential control. The force operating between n-decanethiol self-assembled monolayers (SAMs) on gold was examined by atomic force microscopy in liquid n-dodecane and in an aqueous solution of HClO4. In inert n-dodecane, the bias voltage was simply applied b...

Self-assembled monolayers (SAMs) derived from adsorption of n-alkanethiols onto the surfaces of copper slow the oxidation of the copper surface by ieaction with atmospheric dioxygen. Angstrom-lervel changes in the thickness of the monolayer result in readily observable differences (by X-ray pirotoelectron spectroscopy, XPS) in the rates of oxidation of the copper and adsorbed thiolates. The rat...

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