Materials Science

Inserted in Isolation

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Science  16 Feb 2007:
Vol. 315, Issue 5814, pp. 915
DOI: 10.1126/science.315.5814.915a

Microcontact printing (μCP) with elastomeric stamps can be used to pattern self-assembled monolayers (SAMs) on surfaces, but it can also be useful to create mixed SAMs in which one of the molecules is diluted within the other layer. Mullen et al. show that more diffusive molecules, which are often difficult to pattern with μCP, can be inserted into more stable SAMs by a method they term microcontact insertion printing (μCIP). An existing SAM (in this case, 1-octanethiolate assembled on gold) is contacted in a subsequent μCP step with a second molecule, either 11-mercaptoundecanoic acid (MUDA) or 1-dodecanethiolate.

The extent of insertion, which occurs preferentially at defect sites, can be controlled by changing the contact time and concentration of molecules on the stamp, and more complex patterns can be created with additional rounds of μCIP. — PDS

Appl. Phys. Lett. 90, 10.1063/1.2457525 (2007).

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