聚苯胺共价修饰的氧化石墨烯的合成及其光限幅性能

Synthesis and Optical Limiting Performance of Graphene Oxide Covalently Functionalized with Polyaniline

摘要: 利用酰胺化反应将聚苯胺(PANI)共价接枝到氧化石墨烯(GO)的表面，得到的杂化材料GO-PANI能很好地分散在常见的有机溶剂中。样品的XPS谱和红外光谱数据证实了在GO和PANI之间存在酰胺键。在316 nm激光激发下，PANI和GO-PANI分别在420 nm 和416 nm 处显示出很强的荧光峰。GO-PANI 的最大发射峰相对于PANI的发射峰蓝移了4 nm, 且荧光强度增强。开孔Z-扫描实验结果表明：与PANI相比，GO和PANI的共价键合使材料在532 nm激光辐照下表现出更大的非线性消光系数和三阶非线性极化率虚部值，光限幅性能明显增强。

Abstract: A soluble graphene oxide (GO) covalently functionalized with polyaniline (PANI), GO-PANI, was synthesized by an amidation reaction. The formation of an amido bond between PANI and GO was confirmed by X-ray photoelectron and Fourier Transform Infrared spectroscopy(FT-IR). By using 316 nm excitation light, both PANI and GO-PANI exhibited a strong fluorescence peak, which was located at 420 nm for PANI and 416 nm for GO-PANI, respectively. Compared with PANI, GO-PANI exhibited the 4 nm blue shift and enhanced fluorescence emission. The open aperture Z-scan results demonstrated that GO-PANI exhibited much larger nonlinear optical extinction coefficients, the imaginary third order susceptibility and better optical limiting performance than PANI at 532 nm as a result of the covalent link between GO and PANI.