Maskless Fabrication of Polythiophene Patterns by Photochemical Conversion of Regioselectively Condensed 2,5-Diiodothiophene

Abstract

Maskless fabrication of periodic patterns of a conjugated polymer is achieved by regioselective condensation of 2,5-diiodothiophene on chemically patterned substrate surfaces followed by in situ photochemical conversion of the condensed molecules into oligothiophenes and polythiophenes. This approach utilizes preferential aggregation of monomer molecules on the substrate that is periodically patterned with wetting regions surrounded by nonwetting regions. Since the monomer molecules are confined in the specific regions on the substrate, the polymer patterns can be produced at those locations by blanket irradiation of UV light without mask. The effects of wettability contrast and the dimension of periodicity are important factors for good pattern recognition during the monomer deposition.

Conducting Polymers with Micro or Nanometer Structure

“…Nowadays hydrophilic patterning [410] and even selective condensation [411] to pattern a final conducting polymer patterning has been used to directly fabricate devices in the submicrometer range. Dendritic structures of conducting polymers electrochemically grown between micro-patterned electrodes from a monomer vapor [412] and patterning the hydrophobic/hydrophilic structures on a surface have been reported [413].…”

Study on synthesis and photochemical behavior of carbamate photobase generators for fluorescence imaging

“…Excellent reviews of luminescent sensors, switch molecules corresponding to various targets, 1 and fluorescence of polymer films by photomasked irradiation for precursors of fluorescent material 2 have been published. Methods of fluorescence imaging have been widely investigated in biosensor, [3][4][5][6][7] chemosensor, 8,9 printing, 10,11 and other imaging industries. Nowadays, photoirradiation technique represents the most popular and practical approach for fluorescence images generation.…”

Fluorescence “Turn‐On” Patterning With Polymers Having Pendant Triphenylmethane Groups as Fluorophore Precursors

“…Methods for the generation of patterned fluorescence images find great utility in a variety of fields including biotechnology, sensors, molecular switches, imaging, and display areas 1–8. Among the various techniques such as photoirradiation,9–14 inkjet/screen printing,15, 16 vapor deposition,17, 18 and microcontact printing methods19–22 developed to date, the photoirradiation method represents the most popular and practical approach for the fabrication of patterned fluorescence images on a solid support. Photogenerated acid‐cleavable protecting group strategy,23 photoinduced protonation,24–26 photoinduced proton transfer,27 photochromism28 as well as photoinduced formation of fluorophores,29, 30 photoinduced oxidative degradation,31, 32 and rearrangement33 have been actively employed to manipulate the fluorescence of the precursor molecules.…”