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Table 2 The bonding configurations in the SA-GO (at%)

From: Sulfur-Doped Alkylated Graphene Oxide as High-Performance Lubricant Additive

Bond type	Amine species
Bond type	Butylamine	Octylamine	Laurylamine	Octadecylamine
–C–S–C–	19.07	66.26	66.77	61.67
–C–SO_x–C–	80.93	33.74	33.23	38.33

The SA-GO 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)

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