关于质子交换膜燃料电池膜的扫描电子显微镜图像的荷电现象研究

Research on the Charging Phenomenon of Proton Exchange MembraneFuel CellMembrane in Scanning Electron Microscopy Images

利用蔡司GeminiSEM500场发射扫描电子显微镜观察不导电的质子交换膜燃料电池基底膜在喷镀处理前后,使用不同的二次电子探测器观察图像的荷电情况。结果显示:inlens模式下,即使对隔膜做了喷镀处理,荷电现象依然很明显;而使用SE2模式拍摄的图片,即使是未做喷镀处理,图像的荷电现象明显减少。分析不同的加速电压下,不同的镜筒拍摄模式拍摄的图片的荷电情况,结果显示:随着加速电压增大,图片的荷电效应越大;降低加速电压,可以明显减轻图像的荷电现象,在合适的电压下,对于导电性较差的隔膜样品,使用SE2模式拍摄下,即使不做喷镀处理也可以有效消除图像的荷电现象。

Using the Zeiss Gemini 500 field emission scanning electron microscope to observe the charging status of proton exchange membrane fuel cell substrate membrane with poor conductivity before and after spray coating treatment,different secondary electron detectors were used to observe the image.Theresults show that in the inlens mode,even if the diaphragm is sprayed,the charging phenomenon is still significant;The images captured using SE2 mode,evenwithout spray coating treatment,significantly reduce the charging phenomenon of the images.Analyzing the charging situation of images captured under different acceleration voltages and different lens shooting modes,the results show that as the acceleration voltage increases,the charging effect of the images becomes greater;Reducing the acceleration voltage can significantly reduce the charging phenomenon in the image.At an appropriate voltage,for diaphragmsamples withpoor conductivity,using the SE2 mode for photography can effectively eliminate the charging phenomenon in the image even without spray coating treatment.