Fig. 4From: Sulfur-Doped Alkylated Graphene Oxide as High-Performance Lubricant AdditiveThe ATR-FTIR spectra of the SA-GO which is prepared by the reactions of butylamine, octylamine, laurylamine, octadecylamine, and the sulfur-doped graphene oxide (the oxidation time of the graphene oxide is 24 h)Back to article page