基于改性碳纳米材料的SF6放电分解气敏特性研究

为了解决本征碳纳米管在SF₆气体传感检测方面存在局限性的问题，研究了基于空气等离子体改性的本征碳纳米管气体传感器对SF₆分解气体中重要特征组分的气敏特性。利用空气等离子体对本征碳纳米管进行改性，引入空气等离子体预处理碳纳米管表面，研究改性碳纳米管在检测SF₆气体分解组分时的气体传感响应特性。结果表明：与本征碳纳米管相比，经空气等离子体改性的碳纳米管气体传感器对H₂S气体的电阻变化具有较高的灵敏度，响应时间短，并具有良好的重复性和稳定性；经空气等离子体改性的碳纳米管对SO₂气体电阻变化率的敏感性明显降低；不同掺杂比例的碳纳米管气体传感器对SOF₂和SO₂F₂的敏感性不同。因此，基于空气等离子体改性的本征碳纳米管气体传感器能准确反映SF₆气体的放电分解情况，可为准确检测SF₆气体的分解成分提供依据。

Gas-sensitive properties of SF6 discharge decomposition based on modified carbon nanomaterials

In order to solve the limitation of intrinsic carbon nanotubes in SF6 gas sensing detection,a method was proposedto study the gas-sensitive properties of SF6 discharge decomposition based on modified carbon nanomaterials.The air plasma was used to modify the intrinsic carbon nanotubes and pretreat the surface of carbon nanotubes,and the gas sensing response characteristics of the modified carbon nanotubes in detecting the decomposition components of SF6 was investigated.The results show that the air plasma-modified carbon nanotube gas sensor is more sensitive to the resistance change of H2S gas than the intrinsic carbon nanotube,and has a shorter response time,good repeatability and stability.The air plasma modified carbon nanotube gas sensor is much less sensitive to the change in resistance of SO2 gas.Carbon nanotube gas sensors with different dopant ratios have different sensitivity responses to SOF2 and SO2F2 respectively.Therefore,the intrinsic carbon nanotube gas sensor modified by air plasma can accurately reflect the discharge decomposition of SF6 gas and provide a basis for the detection of SF6 gas composition.