Assembly of strands of multiwall carbon nanotubes and gold nanoparticles using alkanedithiols

Multiwall carbon nanotubes and gold nanoparticles (MWCNT–AuNP) were assembled into strands by cross-linking with alkanedithiols. Long MWCNT strands were first shortened to ∼0.25 μm by chemical oxidation followed by ball-milling, and then thiolated by reaction with cysteamine. The thiol groups on the surfaces of the MWCNT strands combined with Au nanoparticles to produce MWCNT–AuNP strands. A simple mixing of these strands with alkanedithiols resulted in an assembly of strands linked by the alkanedithiols which adsorbed onto the surfaces of the AuNPs attached to the MWCNT–AuNP strands. Short MWCNT–AuNP strands connected to one another in a parallel arrangement, whereas long strands assembled in a crossing arrangement. The possibility of using this method to chemically bond MWCNTs to lower the contact resistance of thin CNT films is discussed.

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► Simultaneous adsorption of alkanedithiol molecules to the AuNPs of different MWCNT–AuNP strands creates chemical bonds between MWCNT–AuNP strands.