Morphological change of a diblock copolymer film induced by selective doping of a photoactive chromophore

Abstract

Tetrakis‐5,10,15,20‐(4‐carboxyphenyl)porphyrine (TCPP) was position‐selectively introduced into a diblock copolymer film of polystyrene‐block‐poly(4‐vinylpyridine) (PS‐b‐P4VP) with a sea–island microphase structure. By immersing the PS‐b‐P4VP film into a solution of TCPP/methanol, TCPP was introduced into the island parts comprising P4VP phase. The morphology of the island parts depended on the immersion time and TCPP concentration. A schematic model for the morphological change caused by the phase‐selective introduction of TCPP was proposed. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 368–375, 2007

Site-Selective Doping of Dyes into Polystyrene-block-Poly(4-vinyl pyridine) Diblock Copolymer Films and Selective Laser Ablation of the Dye-Doped Films

“…The details of the doping process are reported elsewhere. 22) The doping condition was determined on the basis of the dependences of the absorption intensities of the dyes both on the concentration of the dyes in the methanol solution and on the time immersed in the solution. The present doping condition gave the maximum concentration of dyes in films.…”

“…Judging from these AFM images, an AFM image of PS-b-P4VP films that were immersed in methanol, and the results of the doping of TCPP into PS and P4VP homopolymer films, we determined that the doping of TCPP into P4VP-island parts was successful. 22) Firstly, we investigated the laser ablation of the TCPPdoped thin PS-b-P4VP films in air. However, no selective ablation of the P4VP-island parts occurred after one-shot laser irradiation with a fluence of 170 mJ/cm 2 .…”

“…A successful selective doping of chromophores into one component of the diblock copolymer film is the first important step to achieve the selective ablation of films. There are several methods for selectively doping dye chromophores into block copolymer films: (1) the chemical introduction of chromophores into one component of block copolymers, [15][16][17][18][19][20][21] (2) the immersion of block copolymer films into a solution of chromophores using a solvent that can dissolve only one component, 22,23) and (3) the vapor transportation of chromophores whose compatibility with the two components of a diblock copolymer is different. [24][25][26] We reported that the immersion method is an effective method for the site-selective doping of chromophores into island parts of diblock copolymer films with a sea-island microphase structure when hydrogen bonds are involved in generating a driving force for the selective doping.…”

“…[24][25][26] We reported that the immersion method is an effective method for the site-selective doping of chromophores into island parts of diblock copolymer films with a sea-island microphase structure when hydrogen bonds are involved in generating a driving force for the selective doping. 22,23) In the present work, using the same method, we selectively doped chromophores into not only the sea-island microphase structure, but also the hole-network structure. The results are also discussed.…”

Thermally Induced Nanocrystal Array of Poly(N-Vinylcarbazole) on Si-Wafer Substrate

“…Recently, nanostructures such as nanocrystals and nanoaggregates have attracted much attention in many quar-ters of materials, electronics, and biology to create the high-value-added functional nanoscale materials and films. Our research groups have also investigated the fabrication of functional films with nanostructures prepared by applying the selective doping method of photoactive chromophore [1] [2] and the laser ablation technique for gold nanoparticles/polymer films [3] [4]. However, photoconductive polymers have attracted increasing attention for producing nanodevices, such as optical sensors, photovoltaic cells, and so on.…”