石墨烯因其超大比表面积及优异电子特性在常温柔性气敏应用方面具有独特优势。然而，石墨烯基气敏器件存在选择性低、响应和恢复时间长等问题。对此，本项目从优化材料成分入手，设计制备石墨烯基三元复合二维材料，引入催化效应和载流子分离效应加快响应和恢复速度，利用异质结效应和增益互补效应提高选择性；改进材料制备方法，利用Hansen溶解度参数理论优化现有石墨烯液相剥离工艺，在多元低沸点溶剂中高效制备可低温加工的二维材料墨水；引入组合材料学思想，喷墨打印高通量制备梯度成分的复合二维气敏材料阵列，利用原位拉曼及阵列测试高通量筛选优化气敏材料组成，获得成分与气敏特性的关联性，结合第一性原理计算阐明复合二维材料气敏机理及响应模型；最终构筑常温下工作且对6种典型室内污染气体具有快速响应恢复和选择性的柔性气体传感器。本研究期待为未来气敏材料的研发建立新的模式，为基于二维材料的喷墨打印柔性电子构筑理论基础和技术支撑。

Graphene has unique advantages in flexible gas sensing applications at room temperature due to its large specific surface area and excellent electronic properties. However, graphene-based gas sensors have several drawbacks, such as low selectivity and long response/recovery time. In this regard, starting with the optimization of the material composition, we propose to prepare graphene-based ternary two-dimensional (2D) composites, in which the recovery/response speed could be accelerated by introducing catalytic effect and carrier-separation effect, and the selectivity could be improved by utilizing the heterojunction effect and complementarity effect. The existing material preparation method is also improved. The traditional liquid-phase exfoliation method is optimized by using Hansen's solubility parameter theory, so as to achieve a high-efficiency preparation of low-temperature processable 2D material inks in multicomponent low-boiling-point solvents. Introducing the idea of combinatorial materials science, we propose to fabricate 2D composite sensor arrays with component gradient by inkjet printing technology, and perform high-throughput sensing screening by in-situ Raman and sensor-array measurement. Combining first-principle computation, the gas sensing response models of 2D composites are constructed by systematically analyzing the correlation between composite components and gas sensing properties. Finally, a flexible gas sensor working at room temperature with fast response/recovery speed and selectivity toward 6 typical indoor polluted gases is constructed. This research is expected to establish a new method for the future development of gas sensing materials and provide theoretical basis and technical support for the construction of flexible electronic based on inkjet printing technology and 2D materials.