The present invention relates to a spark discharge generator. The spark discharge system of the present invention includes a plurality of columnar electrodes and a ground plate having a plurality of outlet holes at positions corresponding to the columnar electrodes. The use of the spark discharge generator enables the production of a three-dimensionally shaped nanostructure array on a large area in a uniform and rapid manner.

Disclosed are a liquid ion generator and a method of preparing an ion-metal complex using the same. More particularly, the ion generator includes a chamber; an electromagnetic field generator for forming an electric field or a magnetic field in the chamber; and a power source for supplying power to the electromagnetic field generator.