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We report the synthesis of capsule-embedded reduced graphene oxide (rGO) by photocatalytic reduction in the presence of peanut shaped alpha-Fe2O3 particles under visible light. This process is able to produce highly stabilized water dispersible rGO without the help of a stabilizer, which is suitable to make thin films on a glass substrate by the drop casting method. In addition, the evolution of the morphology with different visible light exposure times ranging from 5 to 120 minutes reveals that the catalyst leads to transformation of a few rGO sheets into capsules via a core-shell structure. These capsules are stable on the rGO sheet at a vacuum of 10(-9) Torr, but unstable under vacuum annealing at 400 degrees C and 10(-5) Torr that created impressions on the rGO film. The bandgap of the capsule-embedded rGO decreases non-linearly with the visible light exposure time; from 2.47 eV at 5 min to 1.73 eV at 120 min.
We report the synthesis of capsule-embedded reduced graphene oxide (rGO) by photocatalytic reduction in the presence of peanut shaped alpha-Fe2O3 particles under visible light. This process is able to produce highly stabilized water dispersible rGO without the help of a stabilizer, which is suitable to make thin films on a glass substrate by the drop casting method. In addition, the evolution of the morphology with different visible light exposure times ranging from 5 to 120 minutes reveals that the catalyst leads to transformation of a few rGO sheets into capsules via a core-shell structure. These capsules are stable on the rGO sheet at a vacuum of 10(-9) Torr, but unstable under vacuum annealing at 400 degrees C and 10(-5) Torr that created impressions on the rGO film. The bandgap of the capsule-embedded rGO decreases non-linearly with the visible light exposure time; from 2.47 eV at 5 min to 1.73 eV at 120 min.
2015/9/4 2:40:56
