writer：Jintang Huang,a Youju Huang* and Si Wu*
keywords：Laser Ablation,Azobenzene Derivatives
source：期刊
specific source：Frontiers of Chemical Science and Engineering
Issue time：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).