Gold nanoparticle-carbon nanowire hybrid interdigitated array nanoelectrodes for enhancing electrochemical singnal amplification

We previously presented 3D glassy carbon interdigitated array (IDA) nanoelectrodes fabricated using carbon-MEMS process consisting of UV lithography and pyrolysis [1]; this simple batch process converts a microscale polymer structure into a glassy carbon nanostructure due to a high volume reduction in pyrolysis. In spite of the simple fabrication of the 3D glassy carbon nanostructures, the redox cycling current signal amplification was limited by the reduction of aspect ratio of glassy carbon nanoelectrodes due to the anisotropic volume reduction. In this paper, we present a 3D carbon IDA nanoelectrode integrated with gold nanoparticles grown using electrodeposition. This hybridization of the nanoparticles and the carbon electrode enhances the electrode surface and current signal amplification.