Chemistry

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Science  09 Sep 2005:
Vol. 309, Issue 5741, pp. 1651
DOI: 10.1126/science.309.5741.1651a

Microcontact printing (μCP) of thiols on gold surfaces makes it feasible to create intricate patterns quickly and at low cost, but one limitation of this method in many applications is that the thiol molecules tend to diffuse into the bare regions of the gold surface. Trying to restrict the spreading by backfilling the bare spots in a follow-up step can blur pattern boundaries through prolonged exposure to solvent.

Dameron et al. show that the preadsorption of 1-adamantanethiol (AD) on gold surfaces creates a well-ordered but weakly bound layer that can be displaced by long-chain thiols, such as 1-decanethiol, that are transferred to the surface with a μCP stamp. By tuning the concentration of alkanethiols on the stamp and the contact time, patterns can be formed without the problem of lateral mixing of the adjacent self-assembled monolayers (SAMs). — PDS

Nano Lett. 10.1021/nl050981j (2005).

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