Solution-Phase Laser Processing of Pi-Conjugated Polymers: Switching Between Different Molecular States
Solution-Phase Laser Processing of Pi-Conjugated Polymers: Switching Between Different Molecular States
复制标题
Pi 共轭聚合物的溶液相激光加工：不同分子状态之间的切换
DOI：
10.1088/1742-6596/358/1/012012
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Kouhei Takada and Akihiro Tomioka
中科院分区：
文献类型：
--
作者：
Ely Aprilia;Haruki Kato;Junpei Gotou;Shinya Haraguchi;Suprijadi;Tatsuki Oda;Kouhei Takada and Akihiro Tomioka
液相激光加工，其中激光照射的目标材料浸没在水中冷却，已被报道为一种有前途的热脆性有机材料的加工技术。虽然已经报道了用液相激光处理获得纳米尺寸的颗粒，但是物理性质没有改变，因为量子力学尺寸效应在零半径Frenkel激子中不表现出自身。在本研究中，我们进一步使用溶液液滴作为目标材料，其中有机分子分子以分子形式分散在有机溶剂中，因此，预计在激光照射后容易改变构象和能量状态。小体积的有机溶剂在激光照射时迅速蒸发，使裸露的有机分子置于水中并迅速冷却。为了防止目标π-共轭分子的化学分解，样品由ns脉冲绿色激光共振照射，而不是由常规的UV激光。
Liquid-phase laser processing, where the laser-irradiated target material is immersed in water for cooling, has been reported as a promising processing technique for thermally fragile organic materials. Although nanometer-sized particles have been reported to be obtained with the liquid-phase laser processing, the physical property did not change because quantum-mechanical size effect does not exhibit itself in the zero-radius Frenkel excitons. In the present study, we step further to use solution droplets as a target material, where organic molecules are molecularly dispersed in organic solvent and, therefore, expected to easily alter the conformation and the energy state upon laser irradiation. Small volume organic solvent is quickly evaporated upon laser irradiation, letting the bare organic molecule placed in water and rapidly cooled. To prevent the chemical decomposition of the target π-conjugated molecule, the specimen was resonantly irradiated by a ns-pulse green laser, not by a conventional UV laser.