Electroless plating is a chemical deposition process in which metal is deposited on insulating substrate and complex shapes materials without the use of electricity. Gold electroless plating is in particular important due to its various excellent characteristics.
Highly toxic gold cyanide has been used as one of the raw materials for conventional electroless gold plating, causing risks on the working and global environments. Moreover, physical treatment methods using expensive vacuum apparatus, such as plasma treatment, or chemical treatment methods using the dangerous oxidant have been employed for surface treatments necessary to obtain adhesion of plated films. In addition, complex process was required for the deposition of palladium used as a catalyst.