ABSTRACT

Al-doped ZnO/reduced graphene oxide nanocomposite (Al-ZnO/rGO NC) has been produced by the chemical method. The structural characteristics of rGO and Al-doped ZnO were confirmed by using XRD. Wurtzite structure with no impurity phase was observed after Al addition to ZnO lattice. Field emission scanning electron microscope (FESEM) was used to display the morphological information of nanocomposite which reveals the Al-doped ZnO nanoparticles to get dispersed over the rGO sheet. The optical and dielectric properties of obtained composite were investigated. The optical absorption spectra have been studied using UV-visible spectroscopy which showed a red shift in the absorbance band and decrease in the bandgap with increase in the amount of rGO NCs. A significant improvement in the dielectric constant was observed in Al-ZnO/rGO nanocomposite which ascribed to interfacial polarization between Al-doped ZnO and rGO. Further, the electrical conductivity of NCs also improved which supports the electron transfer phenomenon of rGO.

摘要

已经通过化学方法制备了Al掺杂的ZnO/还原氧化石墨烯纳米复合材料（Al-ZnO/rGO NC）。rGO和Al掺杂的ZnO的结构特征通过XRD证实。在ZnO晶格中加入Al后，观察到没有杂质相的纤锌矿结构。场发射扫描电子显微镜 (FESEM) 用于显示纳米复合材料的形态信息，显示 Al 掺杂的 ZnO 纳米颗粒分散在 rGO 片上。研究了所得复合材料的光学和介电性能。已经使用紫外-可见光谱研究了光学吸收光谱，该光谱显示随着rGO NC数量的增加，吸收带出现红移，带隙减小。在 Al-ZnO/rGO 纳米复合材料中观察到介电常数的显着提高，这归因于 Al 掺杂的 ZnO 和 rGO 之间的界面极化。此外，NCs 的电导率也有所提高，这支持了 rGO 的电子转移现象。