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Real-time XPS study of reduction of graphene oxide; Effect of hydrazine treatment

Watanabe, Daiki*; Ogawa, Shuichi*; Yamaguchi, Hisato*; Hozumi, Hideaki*; Mattevi, C.*; Yoshigoe, Akitaka ; Ishizuka, Shinji*; Teraoka, Yuden; Yamada, Takatoshi*; Chhowalla, M.*; Takakuwa, Yuji*

Evolution of chemical structure of graphene oxide (GO) was investigated with an atomic level using synchrotron light source (SPring-8). Our photoelectron spectroscopy results revealed that there was a distinct difference between chemical structures of GO with and without hydrazine treatment prior to the thermal reduction. Hydrazine treated GO, which is widely used as GO having high electrical conductivity, had less structural defects and amorphous components in the material. This tendency was consistent even after the thermal reduction. Our results provided new insights into the clarification of the transport mechanism, as well as strategy for improving its electrical property for electronic applications.

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