Large-scale Preparation Of High-quality Thin Few-layer Graphene And Its Application On Lithium-ion Batteries And Surface-enhanced Raman Spectroscopy

Mass production of reduced graphene oxide and graphene nanoplatelets has recently been achieved.However,a great challenge still remains in realizing large-quantity and high-quality production of large-size thin few-layer graphene(FLG).Here,we create a novel route to solve the issue by employing one-time-only interlayer catalytic exfoliation(ICE)of salt-intercalated graphite.The typical FLG with a large lateral size of tens of microns and a thickness less than 2 nm have been obtained by a mild and durative ICE.The high-quality graphene layers preserve intact basal crystal planes owing to avoidance of the degradation reaction during both intercalation and ICE.Furthermore,we reveal that the high-quality FLG ensures a remarkable lithium-storage stability(>1,000 cycles)and a large reversible specific capacity(>600 mAh-g-1).This simple and scalable technique acquiring high-quality FLG offers considerable potential for future realistic applications.As-prepared graphene was used as substrate of Raman Spectroscopy and numbers of small organic molecules and truxenes compounds were tested on graphene by Raman Spectroscopy.The results show that graphene as a substrate,good enhancement effect can be achieved,and the Raman signal can reflect the real characteristics of the molecules.