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【[Frontiers of Chemical Science and Engineering]】Laser Ablation of Block Copolymers with Hydrogen-Bonded Azobenzene Derivatives
作者:Jintang Huang,a Youju Huang* and Si Wu*
关键字:Laser Ablation,Azobenzene Derivatives
论文来源:期刊
具体来源:Frontiers of Chemical Science and Engineering
发表时间:2018年

We investigated laser interference ablation

of block copolymer supramolecular assemblies. Supramolecular assemblies

(PS-b-P4VP(AzoR)) are fabricated by hydrogen-bonding azobenzene derivatives

(AzoR) to poly(4-vinyl pyridine) blocks of polystyrene-block-poly(4-vinyl

pyridine) (PS-b-P4VP). PS-b-P4VP(AzoR) forms phase separated nanostructures

with a period of ~75-105 nm. A second length scale structure with a period of 2

μm is fabricated on phase separated PS-b-P4VP(AzoR) by laser interference

ablation. Both the concentration and the substituent of AzoR in PS-b-P4VP(AzoR)

affect the laser ablation process. The laser ablation threshold of

PS-b-P4VP(AzoR) decreases as the concentration of AzoR increases. In

PS-b-P4VP(AzoR) with different substituents (R = CN, H, and CH3),

ablation thresholds follow the trend: PS-b-P4VP(AzoCN) < PS-b-P4VP(AzoCH3)

< PS-b-P4VP(AzoH). This result indicates that the electron donor group (CH3)

and the electron acceptor group (CN) can lower the ablation threshold of

PS-b-P4VP(AzoR).