物理化学学报 >> 2009, Vol. 25 >> Issue (11): 2385-2390.doi: 10.3866/PKU.WHXB20091127

研究论文 上一篇    下一篇

聚(2-甲氧基-5-丁氧基)对苯乙炔/Eu2O3纳米复合材料的合成及其光学效应

孙建平, 翁家宝, 林婷, 马琳璞   

  1. 福建师范大学化学与材料学院, 福州 350007|福建省高分子材料重点实验室, 福州 350007
  • 收稿日期:2009-07-06 修回日期:2009-08-31 发布日期:2009-10-28
  • 通讯作者: 孙建平 E-mail:jpsun@fjnu.edu.cn

Synthesis and Optical Effects of Poly(2-methoxy-5-butoxy)-p-phenylene Vinylene/Eu2O3 Nanocomposites

SUN Jian-Ping, WENG Jia-Bao, LIN Ting, MA Lin-Pu   

  1. College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, P. R. China|Key Laboratory of Polymer Materials of Fujian Province, Fuzhou 350007, P. R. China
  • Received:2009-07-06 Revised:2009-08-31 Published:2009-10-28
  • Contact: SUN Jian-Ping E-mail:jpsun@fjnu.edu.cn

摘要:

采用原位脱氯化氢缩合聚合法制备了聚(2-甲氧基-5-丁氧基)对苯乙炔/氧化铕(PMOBOPV/Eu2O3)纳米复合材料. 傅里叶变换红外(FT-IR)光谱证实了在Eu2O3表面的包覆层为PMOBOPV. 高分辨透射电子显微镜(HRTEM)观察发现, PMOBOPV/Eu2O3纳米复合材料具有核-壳结构, 直径为75-145 nm, 其中PMOBOPV包覆层厚度约为25 nm. 紫外-可见(UV-Vis)吸收光谱表明, 随着Eu2O3含量增加, PMOBOPV/Eu2O3的最大吸收峰发生红移且强度提高. 荧光光谱研究表明, 随着Eu2O3含量增加, PMOBOPV/Eu2O3的最大发射波长发生蓝移且强度提高, Eu2O3与PMOBOPV之间形成了光致电子转移体系, 使π电子离域程度增加, 并且导致荧光量子效率提高. 根据光学禁带宽度(Eg)与入射光子能量(hυ)的关系, 拟合了PMOBOPV/Eu2O3薄膜的光学禁带宽度, 发现随着Eu2O3含量增加, Eg逐步减小. 采用简并四波混频方法测试它们的三阶非线性极化率(χ(3)), 发现随着Eu2O3含量增加, PMOBOPV/Eu2O3纳米复合体的非线性光学响应逐渐增强, 这说明PMOBOPV与Eu2O3之间形成了分子间光致电子转移体系, 产生了复杂的分子间离域π电子非线性运动.

关键词: 纳米复合材料, 聚(2-甲氧基-5-丁氧基)对苯乙炔, 氧化铕, 非线性光学, 光致发光

Abstract:

The photoelectric nanocomposite poly(2-methoxy-5-butoxy)-p-phenylene vinylene/Eu2O3 (PMOBOPV/Eu2O3) was prepared by a dehydrochlorination in situ polymerization. Results from Fourier transform infrared (FT-IR) spectroscopy indicate that PMOBOPV is coated onto the surface of Eu2O3. The composite dimensions were observed by high resolution transmission electron microscopy (HRTEM). PMOBOPV/Eu2O3 nanocomposites possess core-shell structures and their diameters were about 75-145 nm with a PMOBOPV coating thickness of about 25 nm. A stronger red-shifted absorption peak was observed with an increase in Eu2O3 content for PMOBOPV/Eu2O3 in the UV-Vis spectrum. Photoluminescence spectroscopy indicates that the maximum emission wavelength of the PMOBOPV/Eu2O3 is blue-shifted and the intensity of photoluminescence increases with increasing Eu2O3 content. PMOBOPV/Eu2O3 shows increased fluorescence because of an intermolecular photo-induced charge transfer process. The optical band gap (Eg) of PMOBOPV/Eu2O3 decreased gradually with increasing Eu2O3 content. The third-order optical nonlinear susceptibility of PMOBOPV/Eu2O3 nanocomposites was measured by degenerate four wave mixing. Results show that the third-order nonlinear optical response of PMOBOPV/Eu2O3 nanocomposites increases gradually with increasing Eu2O3 content. This can be attributed to intermolecular photo-induced electron transfer and delocalized π electron coupling between PMOBOPV and Eu2O3.

Key words: Nanocomposite materials, Poly(2-methoxy-5-butoxy)-p-phenylene vinylene, Eu2O3, Nonlinear optics, Photoluminescence

MSC2000: 

  • O644