Study The Photophysical Process On Photo-Reduction Of Graphene Oxide

Since 2004,graphene was discovered by two British scientists,due to its unique and excellent properties,such as higher electron mobility,high specific surface area,good flexibility,excellent heat resistance and strong mechanical performance.Therefore,graphene has attracted the attention of many scientists.However,through what kind of method to get a lot of high quality graphene has been a stumbling block to the development of graphene field.Graphene oxide as a precursor of graphene,the main differences between graphene and graphene oxide in structurally,that is the base and the side of graphene have some oxygen-containing functional groups such as hydroxyl,carboxyl,carbonyl and epoxy groups,etc.Therefore,we can remove the oxygen-containing functional groups on graphene oxide to get graphene,this method is the reduction method.However,there are many methods for reducing graphene oxide,such as chemical reduction,electrochemical reduction,thermal reduction,photo-reduction,and the like.These reduction methods have their own advantages and disadvantages,chemical reduction method and thermal reduction method,although the rapid reduction of large amounts of graphene oxide,but the chemical reagents used in the reduction process have a seriously bad influence on the environmental pollution,besides,the reduction conditions and reduction equipment are hardly achieving.However,the photoreduction method can overcome the above shortcomings,this method is of environment friendly,the requirement of device are low demand,is a simple and feasible green reduction method.However,with the development of optoelectronics field based on graphene oxide,we had better to understand the photophysical processes of photo-reduction of graphene oxide.In addition,we know that graphene oxide with different oxygen contents,their the fluorescence intensity and the wavelength of the luminescence center will have different changes.Thus,here we study the photophysical processes of the photo-reduction of graphene oxide by exploring the fluorescence evolution process of graphene oxide reducted by the light with different wavelengths.First of all,we mainly introduce the time-resolved femtosecond transient absorption spectra,the construction of time-resolved pump-detection system as a whole,and the adjustment of the optical path.Secondly,the synthesis of graphene oxide method,and its steady-state optical aspects of the characterization,as well as chemical analysis and so on.Thirdly,the apparatus and method for reducing the graphene oxide are described,and we carried out the gravimetric optical characterization of the reduced graphene oxide,and the chemical analysis.We found that both UV light and visible light can reduce graphene oxide,the steady state fluorescence peak position moved in different directions.In addition,the chemical analysis shows that the oxygen-containing functional groups role in UV light and visible light reduction of graphene oxide are different,these phenomena inspired our enthusiasm for the study.Finally,we investigated the time-resolved transient absorption spectra of graphene oxide and photo-reducted graphene oxide,and discussed with the results of steady-state optical and chemical analysis.Finally,we obtained the photophysical process on the photo-reduction of graphene oxide.In summary,the study of the photophysical process of photo-reduction of graphene oxide in this paper will be beneficial to the research and development of photonic electronics based on graphene oxide,especially in optoelectronic devices and photo-catalysis based on photo-reduction of graphene oxide.Provide a certain theoretical basis on visible light hydrolysis and other fields.