氧化石墨烯与水溶性酞菁铜的表面增强拉曼散射光谱特性研究

摘要

Graphene oxide (GO)was chosen as the Raman enhancement substrate,and the effect of the number of GO layers and probe molecule water soluble copper phthalocyanine (TSCuPc)films thickness on surface enhanced Raman scattering (SERS) was investigated.In our work,spin-coating method was carried out for preparing GO films with different number of GO layers by using different concentrations,and then different TSCuPc films were prepared by adj usting the speed.The results of the ex-periments showed that:with the increasing of the layer number of GO films,both the polarizability induced byπ—πconj ugation and local dipole moment induced by oxygen-containing groups increased,resulting in a stronger Raman enhancement presenting a saturated tendency.Meanwhile,the enhancement of characteristic peaks of TSCuPc linearly increased with the increasing of the thickness of TSCuPc films and compared to the influence of GO layer number,the first-layer effect resulting from the thickness of TSCuPc was less pronounced.The TSCuPc molecule prepared by solution method is generally used for hole inj ection layer of organic optoelectronic devices and there will be of great significance to improve the hole inj ection efficiency,transmission efficien-cy and stability of organic optoelectronic devices by researching the surface enhanced Raman spectrum of GO and TSCuPc.%采用氧化石墨烯(GO)作为表面增强拉曼散射的基底,水溶性酞菁铜(TSCuPc)作为探针分子,实验探究了氧化石墨烯薄膜的层数和TSCuPc薄膜的厚度对拉曼散射增强的影响.首先配制了不同浓度的GO溶液,利用旋涂法在玻璃基底上制备了不同层数的GO膜,然后通过调节TSCuPc薄膜的旋涂转速,制备了GO和TSCuPc的复合薄膜.实验结果表明,当增加GO薄膜层数时,由GO和TSCuPc产生的π—π共轭所感应的分子极化率和由GO含氧官能团感应的局域电场均增大,因此TSCuPc分子的拉曼强度增大,且随着层数的增加,增强呈现饱和趋势;而随着TSCuPc薄膜厚度的增加,由于其自身分子间也存在π—π共轭,TSCuPc分子的拉曼光谱强度呈近似线性增加,且由TSCuPc薄膜厚度引起的首层效应并不是很明显.选用的可以溶液法成膜的TSCuPc分子,通常被用作有机光电子器件的空穴注入材料,研究GO与TSCuPc的表面增强拉曼光谱特性,为优化器件参数以提高有机光电子器件的电荷转移效率等性能具有重要的意义.