Article

Deflected capillary force lithography.

Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843, United States.
ACS Nano (impact factor: 10.77). 02/2012; 6(2):1548-56. DOI:10.1021/nn2045278 pp.1548-56
Source: PubMed

ABSTRACT Herein we introduce a novel strategy based on capillary force lithography (CFL) to fabricate asymmetric polymeric ring structures by applying both shear and nomal forces to a poly(dimethylsiloxane) stamp. The mechanism for the formation of asymmetric rings is caused by the deflection of cylindrical PDMS pillars due to the shear load, which is therefore termed deflected CFL (dCFL). The asymmetric polymeric rings could be readily transferred to an underlying gold layer to generate split ring structures with tunable opening angles. Asymmetric structures based upon trigular and square-shaped pillars were also fabricated. These elements were formed into periodic arrays over surface areas as large as 1 cm(2) and may have optical and electromagnetic applications.

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Keywords

asymmetric polymeric rings
 
asymmetric rings
 
Asymmetric structures
 
capillary force lithography
 
CFL
 
cylindrical PDMS pillars
 
dCFL
 
electromagnetic applications
 
fabricate asymmetric polymeric ring structures
 
nomal forces
 
periodic arrays
 
split ring structures
 
square-shaped pillars
 
tunable opening angles
 
underlying gold layer