SF₆ gas will decompose four characteristic decomposition products (H₂S, SO₂, SO₂F₂ and SOF₂) when an insulation failure occurs early in SF₆ gas-insulated equipment. By building gas-sensitive sensors into insulation devices it is possible to detect the characteristic gases of insulation faults. In this paper, we use Graphene which is available with good gas sensitivity, as a substrate and then improve the gas response of Graphene by doping with TiO₂ clusters. The adsorption mechanism of (TiO₂)_n-Graphene (n = 1–4) on four characteristic decomposition gases is firstly analyzed based on first principles, and then verifies experimentally. (TiO₂)_n-Graphene (n = 1–4) shows the largest change in E_g after adsorption of SO₂ gas with 61.70%, 1.07%, 23.19% and 64.04%, respectively. The SEM characterization shows that Graphene has an obvious lamellar structure, and TiO₂ nanoparticles are mainly distributed on the outer wall of Graphene, which has a large curvature and strong surface activity. The gas-sensitive response values of the (TiO₂)_n-Graphene (n = 1–4) sensor for different gases at the same gas concentration are ranked as SO₂ > H₂S > SO₂F₂ > SOF₂. The results show that TiO₂ cluster-doped Graphene is a potential gas-sensitive sensing material that can be a new material for online monitoring of faulty gas content in SF₆ gas-insulated equipment.

SF ₆气体绝缘设备早期发生绝缘故障时，SF ₆气体会分解四种特征分解产物（H ₂ S、SO ₂、SO ₂ F ₂和SOF _{2 ）。}通过将气敏传感器内置于绝缘装置中，可以检测绝缘故障的特征气体。在本文中，我们使用具有良好气敏性的石墨烯作为基底，然后通过掺杂TiO ₂团簇来提高石墨烯的气敏性。(TiO ₂ ) _n -石墨烯( n = 1-4) 对四种特征分解气体首先基于第一性原理进行分析，然后进行实验验证。(TiO ₂ ) _n -石墨烯( n = 1–4)吸附SO _2气体后E _g 的变化最大，分别为61.70%、1.07%、23.19%和64.04%。SEM表征表明，石墨烯具有明显的层状结构，TiO ₂纳米粒子主要分布在石墨烯的外壁，曲率大，表面活性强。(TiO ₂ ) _n -石墨烯( n = 1–4) 相同气体浓度下不同气体的传感器排序为SO ₂  > H ₂ S > SO ₂ F ₂  > SOF ₂。结果表明，TiO ₂簇掺杂石墨烯是一种潜在的气敏传感材料，可作为SF ₆气体绝缘设备故障气体含量在线监测的新型材料。