FIG. 2.
Composition of mixed SAMs as a function of mole fractions of the forming thiol solutions as estimated by XPS. (A) Surface mole fraction of the hydrophilic component (χXsurf) as a function of the solution mole fraction of the forming thiol (χXsol) for COOH/CH3- and OH/CH3-SAMs. (B) Surface mole fraction of COOH-terminated alkanethiolate (χCOOHsurfl) as a function of the solution mole fraction of COOH-thiol in the forming solution (χCOOHsol) for COOH/OH-SAMs. Error bars reflect 10% error generally associated with XPS measurements.