title: Block copolymer micelles with near infrared metal phthalocyanine dyes for laser induced writing.
abstract: A route has been developed to disperse metal-containing phthalocyanine dyes in a non-polar medium based on amphiphilic block copolymer micelles of poly[styrene-block-(4-vinylpyridine)] (PS-b-P4VP) and poly[styrene-block-(acrylic acid)] (PS-b-PAA) copolymers. Polar P4VP and PAA efficiently encapsulate cobalt(II), manganese(II), and nickel(II) phthalocyanine dyes by axial coordination of nitrogen and µ-oxo bridged dimerization with the transition metals, respectively. Good dispersion of the dyes is confirmed by the linear enhancement of Q-bands in UV-vis absorption spectra with dye concentration. A thin monolayered PS-b-P4VP micelle film that contained a nickel(II) phthalocyanine dye which efficiently adsorbs a laser beam on a localized area to generate a local heat higher than the glass transition temperatures of both blocks. One-dimensional laser writing on the dye-containing film allows the fabrication of a few submicrometer wide line patterns in which the self-assembled nanostructure of the block copolymer is modified by the directional heat arising from laser scanning.
authors: Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, Korea.
authors: Himadri
authors: H
authors: Acharya
authors: Bokyung
authors: B
authors: Yoon
authors: Youn Jung
authors: YJ
authors: Park
authors: Insung
authors: I
authors: Bae
authors: Cheolmin
authors: C
authors: Park