Nanoelectrodes are tiny electrodes made of metals or semiconducting materials having typical dimensions of 1-100 nm.
Various forms of nanoelectrodes have been developed taking advantage of the different possible fabrication techniques: among the most studied are the nanoband, disk, hemispherical, nanopore geometries as well as the different forms of carbon nanostructures.
It is necessary to characterize each produced electrode: size and shape determine its behavior. The most used characterization techniques are:
*  Electron microscopy
*  Steady-state voltammetry
*  Atomic force microscopy (AFM) 
*  scanning electrochemical microscopy (SECM)
There are mainly two properties that distinguish nanoelectrodes from electrodes: smaller RC constant and faster mass transfer. The former allows measurements to be made in high-resistance solutions because they offer less resistance, the latter, due to radial diffusion, allows much faster voltammetry responses. Due to these and other properties, nanoelectrodes are used in various applications:
*  Studying the kinetics of fast reactions
*  Electrochemical reactions
*  Studying small volumes, such as cells or single molecules
*  As probes for obtaining high-resolution images with scanning electrochemical microscopy (SECM)