Chang Po-Hsun, Tsai Hsieh-Chih, Chen Yu-Ren, Chen Jian-Yu, Hsiue Ging-Ho
Department of Chemical Engineering, National Tsing Hua University, Hsinchu, 300 Taiwan, ROC.
Langmuir. 2008 Oct 21;24(20):11921-7. doi: 10.1021/la802213v. Epub 2008 Sep 25.
In this study, two nonlinear optic hybrid materials with different dimensional alkoxysilane dyes were prepared and characterized. One NLO silane (Cz2PhSO 2OH- TES), a two-dimensional structure based on carbazole, had a larger rotational volume than the other (DR19-TES). Second harmonic ( d 33) analysis verified there is an optimum heating process for the best poling efficiency. The maximum d 33 value of NLO hybrid film containing Cz2PhSO 2OH was obtained for 10.7 pm/V after precuring at 150 degrees C for 3 h and poling at 210 degrees C for 60 min. The solid-state (29)Si NMR spectrum shows that the main factor influencing poling efficiency and thermal stability was cross-linking degree of NLO silane, but not that of TMOS. In particular, the two-dimensional sol-gel system has a greater dynamic and temporary stability than the one-dimensional system due to Cz2PhSO 2OH-TES requiring a larger volume to rotate in the hybrid matrix after cross-linking.
在本研究中，制备并表征了两种具有不同维度烷氧基硅烷染料的非线性光学杂化材料。一种非线性光学硅烷（Cz2PhSO2OH - TES），一种基于咔唑的二维结构，其旋转体积比另一种（DR19 - TES）更大。二次谐波（d33）分析证实，存在一个实现最佳极化效率的最佳加热过程。在150℃预固化3小时并在210℃极化60分钟后，含Cz2PhSO2OH的非线性光学杂化膜的最大d33值为10.7 pm/V。固态（29）Si核磁共振谱表明，影响极化效率和热稳定性的主要因素是非线性光学硅烷的交联度，而非四甲氧基硅烷（TMOS）的交联度。特别是，由于Cz2PhSO2OH - TES在交联后需要在杂化基质中旋转更大的体积，二维溶胶 - 凝胶体系比一维体系具有更大的动态和暂时稳定性。
