We investigated alkanethiol phase-separated self-assembled monolayers (PS-SAMs) using the Kelvin probe force microscope (KFM) combined with the non-contact atomic force microscope (NC-AFM). PS-SAMs were composed of two species of different chain-length alkanethiol. The surface potential (SP) measurements showed that the value of SP was linearly increased as a function of the chain length and that the gradient was about 9 mV per CH 2 unit. In addition, we succeeded in obtaining nanometre-scale variations of the SP, which were discussed in the context of the surface structures.
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Ichii et al. (2004) studied this question.
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