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- W1988403491 abstract "Pull-off force measurements were carried out between gold-coated atomic force microscope (AFM) cantilever tips modified with self-assembled monolayers (SAMs) of thiols and similar SAMs prepared on gold-coated silicon wafer surfaces in air with a relative humidity level less than 15%. The gold sputtered silicon wafer substrate formed a granular morphology with dimensions of 30-50 nm. The radii of curvatures for the two different cantilever tips used in this study were 32 nm and 53 nm. Pull-off force results were analyzed using the Derjaguin-Muller-Toporov (DMT) contact mechanics theory to determine both surface free energy (γ) for OH, CH3, CO2H and NH2-terminated monolayers and the resultant work of adhesion (W A) between SAMs. The analysis took into account the coarse morphology of the gold coating. It was found that the γ and W A values determined with the AFM technique approached similar thermodynamic parameters as calculated from the Lifshitz-van der Waals/Lewis acid-base interaction theory using advancing contact angles; however, the high ends of the adhesion force distributions significantly exceeded the predicted values. This discrepancy is discussed in terms of multiple contact points experienced by a probe penetrating into the grain structure of the gold coating." @default.
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- W1988403491 date "2004-01-01" @default.
- W1988403491 modified "2023-10-18" @default.
- W1988403491 title "Analysis of atomic force microscope pull-off forces for gold surfaces portraying nanoscale roughness and specific chemical functionality" @default.
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- W1988403491 doi "https://doi.org/10.1163/156856104322746965" @default.
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