Self-assembly coating material, heat sink and method of forming heat sink

A heat sink, comprising:

• a substrate;
• and
• a heat dissipation coating material, covering a surface of the substrate, the coating material comprising carbon particles each covered and bonded with a polymer shell,
• wherein the polymer shells of the heat dissipation coating material are bonded to the surface of the substrate through first and second functional groups, the first functional groups comprise thiol groups, and the second functional groups comprise epoxy groups or carboxylic groups.

A method of forming a heat sink, comprising:

• grafting a plurality of polymer chains onto a surface of a carbon particle, wherein each polymer chain has a first functional group, and the first functional groups comprise epoxy groups or carboxylic groups;
• replacing a portion of the first functional groups of the polymer chains with second functional groups, so as to form a modified carbon particle, wherein the second functional groups comprise thiol groups;
• covering a plurality of the modified carbon particles on a surface of a substrate;
• and
• adding a cross-linking agent on the surfaces of the carbon particles and carrying out a cross-linking reaction to form a heat dissipation layer on the substrate.