The effect         of the electrochemical         deposition of metal nanoparticles on the overall resistance of         2-dimensional         networks of single-walled carbon nanotubes (SWNTs) will be         presented.  These         networks show great potential for applications in energy         conversion, sensors,         catalysis, medicine, and electronics.  The preparation of suspensions of unbundled SWNTs is an           important step           for the formation of SWNT networks for these studies.  The         Lay         research group has developed an effective non-oxidizing         purification method         using probe sonication, followed by repeated centrifugation         cycles at low         centrifugal force (~18,000 G) that results in suspensions of         unbundled,         high-aspect ratio SWNTs.  This involved the use of a common         surfactant,         sodium dodecyl sulfate (SDS), to disperse individual, undamaged         SWNTs into an         aqueous solution.  These SWNTs suspensions were then deposited         onto         nonconducting substrates via an iterative deposition process         that allowed strict         density control.  The electrodeposition of metal nanoparticles         was         observed to greatly reduce network resistance.

Electrochemical spot-welding for the reduction       of       electrical resistance in 2D single-walled carbon       nanotube networks

243rd National Meeting (2012)

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