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首先对氧化石墨烯(GO)进行酰氯化得到石墨烯酰氯(GO-Cl),再与3-噻吩甲酸反应形成石墨烯基噻吩(GOT),然后GOT与3-己基噻吩(3-HT)接枝共聚得到聚3-己基噻吩(P3HT)/GO复合材料(P3HT-g-GO)。通过红外光谱(FT-IR)、扫描电镜(SEM)及元素分析(EDX)对产物进行了表征。用热重分析(TGA)研究了复合材料的热稳定性。用紫外吸收(UV-vis)、荧光发射光谱(AFS)、Z-扫描技术(Z-scan)初步研究了P3HT-g-GO的非线性光学特性(NLO)。结果表明,含有5%(wt,质量分数)GO的P3HT-g-GO紫外吸收相对于P3HT发生了16nm的红移。随着GO含量的增加,复合材料容易产生荧光猝灭现象。在相同的线性透过率下,复合材料的非线性吸收系数(18cm/GW)高于纯的P3HT(10cm/GW)和GO(9.2cm/GW),说明P3HT-g-GO具有良好的NLO特性。
The graphene oxide (GO-Cl) was first obtained by acid chlorination of graphene oxide (GO) and then reacted with 3-thiophenecarboxylic acid to form graphene-based thiophene (GOT). Then GOT was coupled with 3-hexylthiophene Poly-3-hexylthiophene (P3HT) / GO composites (P3HT-g-GO) were obtained by copolymerization. The product was characterized by FT-IR, SEM and elemental analysis (EDX). The thermal stability of the composites was investigated by thermogravimetric analysis (TGA). The nonlinear optical properties (NLO) of P3HT-g-GO were studied by UV-Vis, AFS and Z-scan. The results showed that the UV absorption of P3HT-g-GO with 5% (wt, mass fraction) GO shifted 16 nm relative to P3HT. With the increase of GO content, the composite material is prone to fluorescence quenching phenomenon. The nonlinear absorption coefficient (18cm / GW) of the composites is higher than pure P3HT (10cm / GW) and GO (9.2cm / GW) at the same linear transmittance, indicating that P3HT- characteristic.