[Show abstract][Hide abstract] ABSTRACT: An efficient and scalable way to create high-resolution ordered triple-color patterns is based on the liquid behavior of molecules on patterned surfaces and solid sublimation. A blue, green, and orange pattern is obtained from two dyes by deposition of a naphyl diphenyl biphenyl derivative on a hierarchical pattern of a quinacridone derivative.
Small 05/2011; 7(10):1403-6. DOI:10.1002/smll.201002210 · 8.37 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We report a low-cost and high-throughput method to fabricate large-area light emitting pattern via thermal evaporation of organic molecules on the patterned self-assembled monolayer of homogenous 3-aminopropyltrimethoxysilane. This method is based on the selective deposition of the organic light emitting molecules on the template of self-assembled monolayer (SAM), which is patterned with nanoimprinting lithography. The selectivity can be controlled by adjusting the design of the pattern, the storage duration and the substrate temperature. The deposition selectivity of the molecules may be caused by the different binding energy of the molecules with the SAM and the substrate surface.
[Show abstract][Hide abstract] ABSTRACT: It is demonstrated that silver nanoparticle (SNP) arrays fabricated by combining nanoimprint lithography and electrochemical deposition methods can be used as substrates for metal-enhanced fluorescence, which is widely used in optics, sensitive detection, and bioimaging. The method presented here is simple and efficient at controlling the nanoparticle density and interparticle distance within one array. Furthermore, it is found that the fluorescence intensity can be tuned by engineering the feature size of the SNP arrays. This is due to the different coupling efficiency between the emission of the fluorophores and surface plasmon resonance band of the metallic nanostructures.
Small 05/2010; 6(9):1038-43. DOI:10.1002/smll.200902350 · 8.37 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: A method for decreasing the lateral size of the patterned conducting polymer (CP) was demonstrated using nanoimprint lithography (NIL) and isotropic plasma etching. Iron chloride (FeCl3), aniline, tridecafluoro-1,1,2, 2-tetrahydrooctyl-trichlorosilane and N-(3-tri- methoxysilylpropyl)pyrrole (py-silane), PMMA, silver nitrate and citric acid were used without further purification. All water was distilled and subsequently purified to Millipore quality. The silicon wafers with a 100-nm thermally oxidized SiO2 slices and quartz substrates were sonicated consecutively in bath of acetone, chloroform, ethanol, and pure water for 5 mm each. A 400-nm film PMMA was spin-coated on the PANI(polyaniline) layer followed by baking 120°C for 5 mm to remove residual solvent. A PANI patterned substrate was obtained after etching off the residual layer of PMMA and PANI on the recess area, where the PANI was protected by the PMMA resist layer. The result demonstrate that the PANI pattern is of high selectivity for silver nanoparticle absorption.
Small 03/2009; 5(5):583-6. DOI:10.1002/smll.200801197 · 8.37 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: In this paper, we present a bottom-up approach to pattern organic luminescent molecules with a feature size down to sub-100 nm over wafer-sized areas. This method is based on the selective gas deposition of organic molecules on self-organized patterned structures, which consist of an organic monolayer with two different phases rather than different materials. The site selectivity is controllable by deposition rate and the pattern features. The reason for the site selectivity may be due to the nucleation and diffusion behaviors of the deposited organic molecules on different monolayer phases.