Duplication of photoinduced azo polymer surface-relief gratings through a soft lithographic approach.

Full Abstract

In this work, a soft lithographic approach has been developed to duplicate photoinduced surface-relief-gratings (SRGs) of azo polymer films to generate the surface pattern replicas composed of different materials on various substrates. For this purpose, thin films of an epoxy-based azo polymer (BP-AZ-CA) were prepared by spin-coating, and SRGs with different structures were inscribed by exposing the films to interference patterns of Ar(+) laser beams at modest intensity (150 mW/cm(2)). Using the azo polymer films as masters, stamps of poly(dimethylsiloxane) (PDMS) were prepared by replica molding. The PDMS stamps were then used to transfer the solutions of poly(3-hexylthiophene) (P3HT), multiwalled carbon nanotube (MWNT), and BP-AZ-CA to different substrates by contact printing. Through this process, surface pattern replicas made of the functional materials were obtained. The pattern formation and quality depended on the factors such as the solution concentration, contacting time in the printing process, and printing pressure. Under the proper conditions, the printed patterns showed the same grating periods as the masters and the same relief depths as the stamps (replicas of the masters). This approach, showing some attractive characteristics such as the easiness of master preparation and the versatility of soft fabrication processes, can be applied to the fabrications of optical functional surfaces, sensors, and photonic devices.

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Author information

Author/s: Liu, Bin (B); Wang, Mingqing (M); He, Yaning (Y); Wang, Xiaogong (X);

Affiliation: Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing 100084, P. R. China.

Journal and publication information

Publication Type: Journal Article

Journal: Langmuir : the ACS journal of surfaces and colloids (Langmuir), published in United States. (Language: eng)

Reference: 2006-Aug; vol 22 (issue 17) : pp 7405-10

Dates: Created 2006/08/08; Completed 2007/08/17;

PMID: 16893245, status: PubMed-not-MEDLINE (last retrieval date: 12/26/2008)

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