Publications by authors named "Ryotaro Sakakibara"
A multilayer graphene film with random twist angles between layers (TAGr) on SiC(0001̄) shows six pairs of redox peaks for Li insertion/extraction reaction. The distributed twisted angle in TAGr regulates Li insertion sites, and smaller -axis expansion (3%) is realized by Li insertion.
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- The study explores how lithium (Li) interacts with one to two layers of graphene (Gr) on specific single-crystal SiC substrates, using lithium phosphorus oxynitride glass (LiPON) as a solid-state electrolyte instead of liquid electrolytes.
- Unlike traditional liquid electrolytes, LiPON does not cause reduction currents or desolvation reactions, resulting in distinct redox behavior for Gr electrodes with fewer layers, showing fewer oxidation and reduction peaks.
- The research demonstrates that Li insertion and extraction in graphene alters charge transfer resistance at the interlayer level, and highlights that the method using high-quality Gr and LiPON is more effective for precise electrochemical measurements than other methods using bilayer Gr with liquid electrolytes
Graphene on SiC (0001‾) tends to grow in multiple layers and does not have a single orientation relation with the SiC substrate. It has been considered impossible to control the rotation angle of multilayer graphene on SiC (0001‾). In this study, we grew graphene on off-axis SiC substrates with various off angles from 0° to 8° and investigated their in-plane rotation and electronic structures systematically.
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