Figure 4 | Scientific Reports

Figure 4

From: Effective hole conductivity in nitrogen-doped CVD-graphene by singlet oxygen treatment under photoactivation conditions

Figure 4

Simplified reaction scheme showing the formation of pyridine N-oxide and pyridone following the light irradiation of pyridinic nitrogen in the graphene network. The protonated tautomeric forms of pyridone, i.e., zwitterions, are involved together with pyridine N-oxide in the delocalization of positive charge throughout the whole π-conjugated system of graphene.

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