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Report No.

Valence band evaluation of graphene using in-situ photoelectron spectroscopy with non-monochromatic He I line

Ogawa, Shuichi*; Yamada, Takatoshi*; Taga, Ryo*; Yoshigoe, Akitaka ; Takakuwa, Yuji*

The molecular adsorption on graphene causes the modulation of conductivity of graphene, so that the application of graphene for gas sensors are expected. To evaluate the type of conductivity of graphene by photoelectron spectroscopy (PES), the angle-resolved PES is widely used. However, ARPES measurements have been performed usually in synchrotron facility or using monochromatic ultraviolet light. In this study, we try to evaluate the valence band of graphene using angle-integrated PES using non-monochromatic He I line in order to evaluate the changes of valence band of graphene during adsorption and/or desorption of molecules. As summary, we can measure the changes of shift of Fermi level depending on the temperature by using filter based on Fourier transform. This change is caused by desorption of absorbed molecules on graphene, and we can follow up the change because of using high-intensity non-monochromatic He I resonance line.



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