Thiolated surfaces have a high capacity to engineer surface chemistry by changing terminus of the chain and by utilizing thiol mixtures. Clean, flat Au(111) on mica surfaces were used for self assembly to obtain Self Assembled Monolayers (SAM). A simple system of 1-mercaptoundecanoic acid and 1-undecanethiol were used at total 5 mM solutions in varying concentration ratios, in 200 proof ethanol solution. Thiol SAM layers were investigated for surface corrugation, morphology, roughness and structure variation at different thiol ratios. Observations will be discussed, quantitatively and qualitatively. Eventual mixture ratios were so selected towards optimum conditions for confining Bacillus subtilis as a model system. SAM surfaces were investigated using intermittent contact, noncontact, lateral force and contact modes of Atomic Force Microscopy (AFM).

Surface engineering and roughness study of SAM surfaces of 1-mercaptoundecanoic acid and 1-undecanethiol towards biosensing

245th National Meeting (2013)

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