染料共价改性石墨烯及其水分散性研究

Covalent functionalization of graphene with dye diazonium chemisty for its water dispersion properties

摘要:

本文以石墨粉为原料，以直接灰D为改性剂，将其重氮化后共价接枝到自制的还原氧化石墨烯（rGO）上，制备改性石墨烯（MG），以提高石墨烯在水中的分散性，使其更适用于纺织品整理。采用拉曼光谱（Raman）、傅立叶红外光谱（FTIR）、高分辨X射线光电子能谱（XPS）、热重分析（TGA）等表征手段对得到的改性石墨烯进行表征。结果表明，染料分子成功接枝到石墨烯上，接枝率达到21%左右。采用紫外-可见分光光度计（UV-vis）考察了改性石墨烯在水中的分散性。结果发现，相对rGO，MG在水中的分散性和稳定性都大大提高，其水溶液的最大饱和度达到0.185 mg/mL，静置7天后，仍可达到0.092 mg/mL。改性后的石墨烯同时具备了染料和石墨烯的性能。

Abstract:

In this paper, covalently modified graphene (MG) was prepared using graphite and direct ash D as raw materials through diazonium chemistry process to improve its water dispersion properties, so as to suitable for textile industry. The structure, chemical compositions and heat stability of MG were characterized by Raman, Fourier infrared spectroscopy (FTIR), high-resolution X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) etc. The results showed that the dye molecule has been successfully grafted on reduced graphene oxide and the grafting rate reached about 21%. UV-vis spectrophotometer was used to investigate the dispersibility of modified graphene in water and the results disclosed that the dispersibility and stability of MG in water were greatly improved relative to rGO, and the maximum concentration was 0.185mg/mL, and it still remained 0.092mg/mL after 7 days. The modified graphene has both properties of dyes and graphene.