Block Copolymer Micelles with Near Infrared Metal Phthalocyanine Dyes for Laser Induced Writing

다국어 초록 (Multilingual Abstract)

<P>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.</P><P>
<img src='wiley_img_2010/10221336-2010-31-12-MARC201000032-gra001.gif' alt='wiley_img_2010/10221336-2010-31-12-MARC201000032-gra001'>
</P>
<B>Graphic Abstract</B>
<P>Metal-containing (Co<SUP>II</SUP>, Mn<SUP>II</SUP>, and Ni<SUP>II</SUP>) phthalocyanine (Pc) dyes dispersed 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 are investigated. Linear enhancement of Q-bands in the UV–vis absorption spectra with dye concentration confirms the good dispersion. Laser absorption by a thin monolayered PS-b-P4VP micelle film with Ni-Pc allowed the writing of line patterns.
<img src='wiley_img_2010/10221336-2010-31-12-MARC201000032-content.gif' alt='wiley_img_2010/10221336-2010-31-12-MARC201000032-content'>
</P>