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Influence of Atmospheric Contaminants on the Work Function of Graphite
Langmuir ( IF 3.7 ) Pub Date : 2023-08-15 , DOI: 10.1021/acs.langmuir.3c01459
Ruobing Bai 1 , Nathan L Tolman 1 , Zhenbo Peng 2 , Haitao Liu 1
Affiliation  

Airborne hydrocarbon contamination occurs rapidly on graphitic surfaces and negatively impact many of their material properties, yet much of the molecular details of the contamination remains unknown. We use Kelvin probe force microscopy (KPFM) to study the time evolution of the surface potential of graphite exposed to ambient. After exfoliation in air, the surface potential of graphite is not homogeneous and contains features that are absent in the topography image. In addition, the heterogeneity of the surface potential images increased in the first few days followed by a decrease at longer exposure times. These observations are strong support of slow conformation change, phase separation, and/or dynamic displacement of the adsorbed airborne contaminants.

中文翻译:

大气污染物对石墨功函数的影响

空气中的碳氢化合物污染在石墨表面迅速发生,并对它们的许多材料性能产生负面影响,但污染的许多分子细节仍然未知。我们使用开尔文探针力显微镜(KPFM)来研究暴露在环境中的石墨表面电势的时间演变。在空气中剥离后,石墨的表面电位不均匀,并且包含形貌图像中不存在的特征。此外,表面电势图像的异质性在最初几天增加,随后随着曝光时间的延长而减少。这些观察结果有力地支持了吸附的空气污染物的缓慢构象变化、相分离和/或动态位移。
更新日期:2023-08-15
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