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Meyer, E. ; Braun, H.-G.
Controlled dewetting processes on microstructured surfaces - a new procedure for thin film microstructuring

We describe a new experimental attempt to generate defined ultrathin microstructured polymer films. Microcontact printing of 11-undecanoic acid has been used to modify the wetting properties of bare gold surfaces to prepare poor wettable surface domains downward to 4 m size. Film formation of polystyrene films thinner than 20 nm was achieved by dip-coating from a solution of polystyrene in chloroform. The nucleation of holes and the dewetting process was completely controlled by the heterogenity of the surface. Large areas with well defined hole patterns were achieved by the controlled dewetting during the dip-coating process. The remaining film showed no indications for dewetting on the bare gold surface. Especially at higher polymer concentrations Rayleigh instabilities within coalescent rims of adjacent holes are shown to influence the film morphology. Some criteria which are relevant for the design of surface film patterns by controlled dewetting are discussed. Low voltage scanning electron microscopy (LVSEM) which is used appears to be an excellent method for the characterisation of ultrathin films and organic layers downward to 5 nm thickness.

Source
Macromolecular Materials and Engineering 276/277, 44-50

DOI
http://dx.doi.org/10.1002/(SICI)1439-2054(20000301)276:1<44::AID-MAME44>3.0.CO;2-J

Published
April 2000
 
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