Thiolation method for modifying nanodiamonds

摘要

A thiolation method for modifying nanodiamonds includes steps as follows. A carboxylation step is provided, wherein the nanodiamonds are reacted with an oxidant for generating carboxyl groups on surfaces of the nanodiamonds so as to form carboxylated nanodiamonds. A hydroxylation step is provided, wherein the carboxyl groups of the carboxylated nanodiamonds are transformed into hydroxyl groups so as to transform the carboxylated nanodiamonds into hydroxylated nanodiamonds. A thiolation step is provided. In the thiolation step, the hydroxylated nanodiamonds, a sulfur source and a first acidic substance are mixed and then stirred so as to form a first mixture, the first mixture is added portion-wisely into an alkaline solution so as to form a second mixture, and the second mixture is acidified so as to form an acidified solution having a pH value ranging from 2 to 3, thus the hydroxylated nanodiamonds are transformed into thiolated nanodiamonds.

主权项

1. A thiolation method for modifying nanodiamonds comprising:
providing nanodiamonds synthesized by a detonation method; providing a carboxylation step, wherein the nanodiamonds are reacted with an oxidant for generating carboxyl groups on surfaces of the nanodiamonds so as to form carboxylated nanodiamonds; providing a hydroxylation step, wherein a reductant is added for transforming the carboxyl groups of the carboxylated nanodiamonds into hydroxyl groups so as to transform the carboxylated nanodiamonds into hydroxylated nanodiamonds, and the reductant is lithium aluminium hydride (LiAlH4), borane (BH3), or a Fenton reagent; and providing a thiolation step, comprising:
mixing the hydroxylated nanodiamonds, a sulfur source and a first acidic substance and then stirring at a temperature ranging from 125° C. to 160° C. for 36 hours to 60 hours so as to form a first mixture;adding the first mixture portion-wisely into an alkaline solution at a temperature ranging from 0° C. to 35° C. for 12 hours to 36 hours so as to form a second mixture, andacidifying the second mixture so as to form an acidified solution having a pH value ranging from 2 to 3, thus the hydroxylated nanodiamonds are transformed into thiolated nanodiamonds.