Effect of Gold Topography and Surface Pretreatment on the Self-Assembly of Alkanethiol Monolayers

Guo, Liang-Hong; Facci, John S.; McLendon, George; Mosher, Ralph L.

doi:10.1021/la00024a033

Cited by 95 publications

(90 citation statements)

References 4 publications

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“…Resulting films were annealed for between 4 and 16 hours after evaporation at 300 C. The sample was cooled under vacuum to less than 60 C prior to removal from the evaporation chamber. This procedure was used to decrease mica impurities and promote preferential epitaxial gold growth of the Au (111) face [24].…”

Section: Au-mica Annealedmentioning

confidence: 99%

The Influence of the Underlying Gold Substrate on Glucose Oxidase Electrodes Fabricated Using Self-Assembled Monolayers

et al. 2001

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Section: Au-mica Annealedmentioning

confidence: 99%

The Influence of the Underlying Gold Substrate on Glucose Oxidase Electrodes Fabricated Using Self-Assembled Monolayers

et al. 2001

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“…Hence, the purity of the gold surface appears to be more important than its smoothness. 49 Both requirements are met by evaporated or sputtered gold films (typically 50 -200 nm thick) on glass, silicon or cleaved mica substrates. To improve the adhesion of the gold film to the oxide surface, a thin (1 -5 nm) layer of chromium or titanium is often deposited first.…”

Section: Substrate Choice and Preparationmentioning

confidence: 99%

Self‐Assembled Monolayers on Electrodes

Finklea

2000

Encyclopedia of Analytical Chemistry

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Alkanethiols and related molecules spontaneously adsorb from solution or vapor phase onto oxide‐free metals, especially gold, to form close‐packed oriented monolayers. The ease and flexibility of the self‐assembly process provides a convenient method for altering the properties of the metal as an electrode. The close‐packed hydrocarbon layer blocks access of most solution species to the electrode surface. Consequently, interfacial capacitances are markedly reduced and most electron‐transfer reactions are strongly inhibited. The monolayers also provide a foundation for attachment of additional molecules or molecular layers to electrodes. Self‐assembled monolayers (SAMs) on electrodes have been used in voltammetric methods to improve the analytical sensitivity and to impart greater selectivity towards specific analytes. Redox molecules have been anchored at fixed and controllable distances from the electrode surface, thereby permitting the study of electron‐transfer kinetics over long distances and at large driving forces. The ability of SAMs to inhibit metal corrosion and to promote better adhesion of electroactive polymers has been demonstrated.

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“…Depending on the purpose, the superficial gold oxides formed during these steps are chemically reduced by alcohols, normally with ethanol [4, 24 -26]. After these procedures, thermal or electrochemical steps are commonly performed in order to smooth and promote to the electrode an active surface [16,32].…”

Section: Introductionmentioning

confidence: 99%

Polycrystalline Gold Electrodes: A Comparative Study of Pretreatment Procedures Used for Cleaning and Thiol Self‐Assembly Monolayer Formation

2005

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The influence of different surface pretreatment procedures on the electrochemical response of a polycrystalline gold electrode was evaluated. Mechanical polishing with slurry alumina (M), chemical oxidation with H 2 SO 4 /H 2 O 2 (C), electrochemical polishing (potential cycling between À 0.1 V and 1.2 V vs. SCE) (E), chemical reduction with ethanol, and combinations among these treatments were employed to change the surface electrode characteristics. The efficiency of the proposed pretreatments was evaluated by electrochemical responses towards the redox couple ferri(II/III)-ammonium sulfate and by the formation of a self-assembly monolayer of 3-mercaptopropionic acid (3 MPA SAM) on gold electrodes. The procedure (C) allowed important gold surfaces activation. Using procedures (C) and (E) the roughness of polycrystalline gold surfaces was significantly minimized and more reproducible surfaces could be obtained. From the profile of reductive desorption of 3 MPA SAM it was possible to verify that reduced gold surfaces generated better packed monolayers than oxidized ones and a comparative study using CV and DPV techniques showed that between the two desorption peaks, the one localized at more negative potential values corresponds to the cleavage of Au-S bond from the chemisorbed thiol. In general, the improvement in the studied electrochemical responses could not only be attributed to an increase in the real surface area of the electrode, but to the chemical surface states set off by the pretreatment procedure.

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Effect of Gold Topography and Surface Pretreatment on the Self-Assembly of Alkanethiol Monolayers

Cited by 95 publications

References 4 publications

The Influence of the Underlying Gold Substrate on Glucose Oxidase Electrodes Fabricated Using Self-Assembled Monolayers

The Influence of the Underlying Gold Substrate on Glucose Oxidase Electrodes Fabricated Using Self-Assembled Monolayers

Self‐Assembled Monolayers on Electrodes

Polycrystalline Gold Electrodes: A Comparative Study of Pretreatment Procedures Used for Cleaning and Thiol Self‐Assembly Monolayer Formation

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