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

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316nm激光激发下,PANI和GO-PANI分别在420nm和416nm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4nm,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532nm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。

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 PAN1 and （;O was confirmed by X-ray photoelectron and Fourier Transform Infrared spectroscopy（FT-IR）. By using 316 nm excitation light, both PANI and GOPANI exhibited a strong fluorescence peak, which was located at 420 nm for PANI and 416 nm for GO-PANI, respectively. Compared withPANI, 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 PAN1 at 532 nm as a result of the covalent link between GO and PANI.