Revealing the ultrafast process behind the photoreduction of graphene oxide

Régis Y. N. Gengler, Daniel S. Badali, Dongfang Zhang, Konstantinos Dimos, Konstantinos Spyrou, Dimitrios Gournis and R. J. Dwayne Miller ()
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Régis Y. N. Gengler: Hamburg Center for Ultrafast Imaging, University of Hamburg
Daniel S. Badali: Hamburg Center for Ultrafast Imaging, University of Hamburg
Dongfang Zhang: Hamburg Center for Ultrafast Imaging, University of Hamburg
Konstantinos Dimos: University of Ioannina
Konstantinos Spyrou: University of Ioannina
Dimitrios Gournis: University of Ioannina
R. J. Dwayne Miller: Hamburg Center for Ultrafast Imaging, University of Hamburg

Nature Communications, 2013, vol. 4, issue 1, 1-5

Abstract: Abstract Effective techniques to reduce graphene oxide are in demand owing to the multitude of potential applications of this two-dimensional material. A very promising green method to do so is by exposure to ultraviolet irradiation. Unfortunately, the dynamics behind this reduction remain unclear. Here we perform a series of transient absorption experiments in an effort to develop and understand this process on a fundamental level. An ultrafast photoinduced chain reaction is observed to be responsible for the graphene oxide reduction. The reaction is initiated using a femtosecond ultraviolet pulse that photoionizes the solvent, liberating solvated electrons, which trigger the reduction. The present study reaches the fundamental time scale of the ultraviolet photoreduction in solution, which is revealed to be in the picosecond regime.

Date: 2013
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DOI: 10.1038/ncomms3560

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