| 초록 |
Reduced graphene oxide has attracted much attention for its potential utility in applications across a wide variety of fields, including electronic and optoelectronic devices. Currently, reduction of graphene oxide is carried out by chemical methods that use hydrazine as the reductant, which poses safety and cost problems. Here we report a new photocatalytic reduction method using UV light and TiO2 to synthesize highly pure mono graphene sheets that aredispersible in water without the help of stabilizers. More than 90% of the graphene was recovered in a pure form in solution, and residual TiO2 was present at levels below the detection limit. No signs of aggregation were observed, even after one month. The conductivity of graphene films formed from this preparation of reduced graphene oxide was comparable to that of films formed from graphene reduced by hydrazine. The synthesis could be carried out in a continuous process because the recovered TiO2 could be reused continuously without altering the quality of the obtained graphene. A new reaction pathway was proposed, by which graphene oxide is reduced photocatalytically under UV light. |
