中文摘要：

利用层层自组装技术,将聚丙烯酸修饰的石墨烯（PAA-Gr）与聚苯胺（PANI）进行层层自组装,制备了石墨烯/聚苯胺{PAA-Gr/PANI}n复合薄膜.聚丙烯酸修饰石墨烯不仅可以提高石墨烯的分散性,而且可以使石墨烯表面带负电荷,为其与带正电的PANI进行层层自组装提供了可能.利用紫外光谱跟踪了{PAA-Gr/PANI}n复合薄膜层层自组装过程.通过红外光谱、X射线衍射、扫描电子显微镜和循环伏安等方法表征了{PAA-Gr/PANI}n复合薄膜的结构.研究了{PAA-Gr/PANI}n复合薄膜的电化学性能,并探讨了复合薄膜在过氧化氢（H2O2）传感器中的应用.{PAA-Gr/PANI}n复合薄膜对H2O2表现出良好的电催化活性,其线性检测范围为0.005~0.3 mmol/L,线性相关系数为0.99858,检测下限为1×10-6mol/L。

英文摘要：

A novel graphene-polyaniline nanocomposite thin film was prepared by means of electrostatic layer- by-layer（LBL） assembly of positive charged graphene sheets modified by poly （acrylic acid） （PAA-Gr） and negatively charged polyaniline （PANI）. The use of PAA not only enhanced the dispersibility of the graphene sheets, but also provided a positive charge to the graphene thus facilitating the growth of multilayered films. Ultraviolet-visible spectrophotometry was used in the present work to monitor the LBL assembly process of {PAA-Gr/PANItn muhilayered films. Fourier transform infrared spectroscopy, X-ray diffraction patterns, scanning electron microscopy and cyclic vohammetry results demonstrated the successful fabrication of {PAA- Gr/PAN} n hybrid multilayered films. Application of the { PAA-Gr/PANI} n hybrid film in electrochemical sensing was further demonstrated using H2O2 as a model analyte. The {PAA-Gr/PANI}n hybrid film was shown to have excellent electrocatalytic activity towards H2O2. The proposed { PAA-Gr/PANI}n film based sensor exhibited a wide linear detection range for H2O2 from 0. 005 mmol/L to 0. 3 mmol/L with a low detection limit of 1×10^-6 mol/L.