Design of high efficiency for two-photon polymerization initiator: combination of radical stabilization and large two-photon cross-section achieved by N-benzyl 3,6-bis(phenylethynyl)carbazole derivatives
作者:Jin-Feng Xing、Wei-Qiang Chen、Jie Gu、Xian-Zi Dong、Nobuyuki Takeyasu、Takuo Tanaka、Xuan-Ming Duan、Satoshi Kawata
DOI:10.1039/b616792f
日期:——
Novel A–π–D–π–A V-shaped 3,6-bis(phenylethynyl)carbazole based chromophores were designed and synthesized as two-photon polymerization (TPP) initiators combining a large two-photon absorption cross-section with facilitated radical formation. 9-Benzyl-3,6-bis(4-nitrophenylethynyl)carbazole (4d) shows a strong two-photon absorption around 800 nm and exhibits very high two-photon polymerization initiating sensitivity with a threshold power of 0.8 mW at the concentration of 0.18 mol%, which is much lower than the threshold power of 6.37 mW found for benzil. The corresponding threshold of laser exposure intensity for TPP is 3.0 × 107 mJ cm−2. The lowest loading of 4d is up to 0.012 mol% with a threshold power of 3.2 mW.
我们设计并合成了新型 A-π-D-π-A V 型 3,6 双(苯乙炔基)咔唑发色团,作为双光子聚合(TPP)引发剂,将大的双光子吸收截面与促进自由基形成相结合。9-苄基-3,6-双(4-硝基苯乙炔基)咔唑(4d)在 800 纳米附近有很强的双光子吸收,并表现出很高的双光子聚合引发灵敏度,在浓度为 0.18 摩尔% 时的阈值功率为 0.8 毫瓦,远低于苯齐尔的阈值功率 6.37 毫瓦。TPP 的相应激光照射强度阈值为 3.0 × 107 mJ cm-2。4d 的最低负载量为 0.012 mol%,阈值功率为 3.2 mW。