Charge Carrier Dynamics and Photocatalytic Properties of Cu2O/Graphene Nanoheterostructures

• Main Author: 周欣穎
• Other Authors: 徐雍鎣
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/75247434176981810590

碩士 === 國立交通大學 === 材料科學與工程學系 === 100 === This work reported the one-step preparation of Cu2O/RGO nanoheterostructures with the photochemical reaction method. By modulating the concentration of GO employed in the reaction, the amount of Cu2O nanocrystals grown on RGO surface can be readily controlled. Because of the considerably high electrical conductivity of RGO, the photoexcited electrons of Cu2O would preferentially transfer to RGO, leaving positively charged holes in Cu2O to achieve charge carrier separation. Time-resolved photoluminescence spectra were collected to quantitatively analyze the electron transfer event between Cu2O and RGO and its dependence on RGO content. Among the different samples tested, Cu2O /RGO sample with RGO content of 2.0 wt% displayed the highest charge separation efficiency, consistent with the result of dye photodegradation experiment. As compared to the relevant commercial products like N-doped P-25 TiO2 and Cu2O powders, the as-synthesized Cu2O /RGO nanoheterostructures exhibited superior photocatalytic performance toward dye degradation under visible light illumination, demonstrating their potential as applied in relevant photoelectric conversion processes. The recycling test reveals that Cu2O /RGO sample could be promisingly utilized in the long-term course of photocatalysis. Furthermore, the result of performance evaluation under natural sunlight shows that the present Cu2O /RGO nanoheterostructures can be used as highly efficient photocatalysts which can effectively absorb solar spectrum for solar fuel generation.