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.

Laser-Induced Nondestructive Patterning of a Thin Ferroelectric Polymer Film with Controlled Crystals using Ge8Sb2Te11 Alloy Layer for Nonvolatile Memory

“…The 650 nm laser diode (Model No.LD-780−5A) with 5 nm pulse width and optical output power ranging from 5 to 70 mW was used for the laser patterning. 33 Fabrication of capacitor and Characterization. A Metal/GST/ PVDF-TrFE/Al capacitors were made with a highly doped Si substrate as the bottom electrode and thermally evaporated Al top electrodes.…”

“…A lab-made experimental setup was used for experiment. The 650 nm laser diode (Model No.LD-780–5A) with 5 nm pulse width and optical output power ranging from 5 to 70 mW was used for the laser patterning …”

Crafting Threads of Diblock Copolymer Micelles via Flow-Enabled Self-Assembly

“…Intriguingly, among various types of block copolymers, amphiphilic block copolymers composed of a hydrophobic domain and a hydrophilic domain are thermodynamically driven to self-assemble into a broad range of aggregated structures such as spherical micelles, wormlike micelles, and polymersomes when placed in selective solvents, depending on the ratio of the hydrophilic to hydrophobic blocks. Owing to their size uniformity and good kinetic stability, amphiphilic block copolymer micelles can be exploited as nanoreactors to produce functional nanoparticles − and as compartments for nanoparticle loading with applications in light harvesting, laser printing, etc. through simple assembly into closely packed structures .…”