  This paper presents a novel one-step method for the periodical nanopatterning
and reduction of graphene oxide (GO). Self-organized periodic structures of
reduced graphene oxide (rGO) appear on GO surfaces upon processing with a
femtosecond laser at fluences slightly higher than the fluence needed for
reduction of the GO. This indicates that the periodic pattern is formed either
simultaneously with or due to the reduction of the GO. The laser-induced
reduction of GO was identified by sheet resistance measurements, Raman and
X-ray photoelectron spectroscopy. This fast and simple method to both reduce
and periodically structure GO offers a variety of possible applications in
printed and flexible electronics.
