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Hidden Relaxation Channels in Aqueous Methylene Blue after Functionalization of Graphene Oxide Probed by Transient Absorption Spectroscopy
Da Ke,Lai-zhi Sui,Dun-li Liu,Yu-su Wang,Su-yu Li,Yuan-fei Jiang,An-min Chen*,Ming-xing Jin*
Author NameAffiliationE-mail
Da Ke   
Lai-zhi Sui   
Dun-li Liu   
Yu-su Wang   
Su-yu Li   
Yuan-fei Jiang   
An-min Chen*  amchen@jlu.edu.cn 
Ming-xing Jin*  mxjin@jlu.edu.cn 
Abstract:
The mixture of graphene oxide (GO) and dye molecules may provide some new applications due to unique electronic, optical, and structural properties. Methylene blue (MB), a typical anionic dye, can attach on GO via π-π stacking and electrostatic interaction, and the molecule removal process on GO has been observed. However, it remains unclear about the ultrafast carrier dynamics and the internal energy transfer pathways of the system which is composed of GO and MB. We have employed ultrafast optical pump-probe spectroscopy to investigate the excited dynamics of the GO-MB system dispersed in water by exciting the samples at 400 nm pump pulse. The pristine MB and GO dynamics are also analyzed in tandem for a direct comparison. Utilizing the global analysis to fit the measured signal via a sequential model, five lifetimes are acquired:(0.61±0.01) ps, (3.52±0.04) ps, (14.1±0.3) ps, (84±2) ps, and (3.66±0.08) ns. The ultrafast dynamics corresponding to these lifetimes was analyzed and the new relaxation processes were found in the GO-MB system, compared with the pristine MB. The results reveal that the functionalization of GO can alter the known decay pathways of MB via the energy transfer from GO to MB in system, the increased intermediate state, and the promoted energy transfer from triplet state MB to ground state oxygen molecules dissolved in aqueous sample.
Key words:  Transient absorption spectroscopy  Methylene blue  Functionalization of graphene oxide  Relaxation channels
FundProject:This work was supported by the National Natural Basic Research Program of China (No.2013CB922200),the National Natural Science Foundation of China (No.11674128,No.11474129,and No.11504129),Jilin Province Scientific and Technological Development Program,China (No.20170101063JC),the Thirteenth FiveYear Scientific and Technological Research Project of the Education Department of Jilin Province,China (No.400).
氧化石墨烯功能化后含水甲基蓝中隐藏的驰豫通道
柯达,隋来志,刘敦利,王禹苏,李苏宇,姜远飞,陈安民*,金明星*
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DOI:10.1063/1674-0068/30/cjcp1704070
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