CAJ | 학술논문

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/Eu_2O_3)纳米复合材料.傅里叶变换红外(FT-IR)光谱证实了在Eu_2O_3表面的包覆层为PMOBOPV.高分辨透射电子显微镜(HRTEM)观察发现,PMOBOPV/Eu_2O_3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Eu_2O_3含量增加,PMOBOPV/Eu_2O_3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Eu_2O_3含量增加,PMOBOPV/Eu_2O_3的最大发射波长发生蓝移且强度提高,Eu_2O_3与PMOBOPV之间形成了光致电子转移体系,使丌电子离域程度增加,并且导致荧光量子效率提高.根据光学禁带宽度(E_g)与入射光子能量(hv)的关系,拟合了PMOBOPV/Eu_2O_3薄膜的光学禁带宽度.发现随着Eu_2O_3含量增加,E_g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(X ~((3))),发现随着Eu_2O_3含量增加,PMOBOPV/Eu_2O_3纳米复合体的非线性光学响应逐渐增强,这说明PMOBOPV与Eu_2O_3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.
채용원위탈록화경축합취합법제비료취(2-갑양기-5-정양기)대분을결/양화유(PMOBOPV/Eu_2O_3)납미복합재료.부리협변환홍외(FT-IR)광보증실료재Eu_2O_3표면적포복층위PMOBOPV.고분변투사전자현미경(HRTEM)관찰발현,PMOBOPV/Eu_2O_3납미복합재료구유핵-각결구,직경위75-145 nm,기중PMOBOPV포복층후도약위25 nm.자외-가견(UV-Vis)흡수광보표명,수착Eu_2O_3함량증가,PMOBOPV/Eu_2O_3적최대흡수봉발생홍이차강도제고.형광광보연구표명,수착Eu_2O_3함량증가,PMOBOPV/Eu_2O_3적최대발사파장발생람이차강도제고,Eu_2O_3여PMOBOPV지간형성료광치전자전이체계,사기전자리역정도증가,병차도치형광양자효솔제고.근거광학금대관도(E_g)여입사광자능량(hv)적관계,의합료PMOBOPV/Eu_2O_3박막적광학금대관도.발현수착Eu_2O_3함량증가,E_g축보감소.채용간병사파혼빈방법측시타문적삼계비선성겁화솔(X ~((3))),발현수착Eu_2O_3함량증가,PMOBOPV/Eu_2O_3납미복합체적비선성광학향응축점증강,저설명PMOBOPV여Eu_2O_3지간형성료분자간광치전자전이체계,산생료복잡적분자간리역π전자비선성운동.
The photoelectric nanocomposite poly(2-methoxy-5-butoxy)-p-phenylene vinylene/Eu_2O_3(PMOBOPV/ Eu_2O_3) 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 Eu_2O_3. The composite dimensions were observed by high resolution transmission electron microscopy (HRTEM). PMOBOPV/Eu_2O_3 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 Eu_2O_3 content for PMOBOPV/Eu_2O_3 in the UV-Vis spectrum. Photoluminescence spectroscopy indicates that the maximum emission wavelength of the PMOBOPV/Eu_2O_3 is blue-shifted and the intensity of photoluminescence increases with increasing Eu_2O_3 content. PMOBOPV/Eu_2O_3 shows increased fluorescence because of an intermolecular photo-induced charge transfer process. The optical band gap (E_g) of PMOBOPV/Eu_2O_3 decreased gradually with increasing Eu_2O_3 content. The third-order optical nonlinear susceptibility of PMOBOPV/Eu_2O_3 nanocomposites was measured by degenerate four wave mixing. Results show that the third-order nonlinear optical response of PMOBOPV/Eu_2O_3 nanocomposites increases gradually with increasing Eu_2O_3 content. This can be attributed to intermolecular photo-induced electron transfer and delocalized π electron coupling between PMOBOPV and Eu_2O_3.