Photoreduction method for metal complex ions

Abstract

The present invention provides a photoreduction method for metal complex ions by which strict controllability is not required in the control of its exposure amount, and a size of the metallic structure to be produced can be controlled, besides there is no fear of reducing spatial resolution of the size of the metallic structure to be produced. The photoreduction method for metal complex ions wherein a laser beam is beam-irradiated on a metal complex ion dispersion element dispersed in a material to photoreduce the metal complex ions thereby fabricating a metallic structure, includes the steps of adding a predetermined coloring matter to the material in which the metal complex ion dispersion element is dispersed, and beam-irradiating the laser beam to the material to which the predetermined coloring matter has been added.

1 . A photoreduction method for metal complex ions wherein a laser beam is beam-irradiated on a metal complex ion dispersion element dispersed in a material to photoreduce the metal complex ions thereby fabricating a metallic structure, comprising: 
 adding a predetermined coloring matter to the material in which the metal complex ion dispersion element is dispersed; and    beam-irradiating the laser beam to the material to which the predetermined coloring matter has been added.    
   
   
       2 . The photoreduction method for metal complex ions as claimed in  claim 1 , wherein: 
 the coloring matter has the peak of absorption wavelength in the vicinity of about half of the wavelength of the laser beam which is beam-irradiated to the material.    
   
   
       3 . The photoreduction method for metal complex ions as claimed in  claim 1 , wherein: 
 the functional groups of the coloring matter have not a reducing ability with respect to the metal complex ion dispersion element dispersed into the material.    
   
   
       4 . The photoreduction method for metal complex ions as claimed in  claim 1 , wherein: 
 the material is Au +  aqueous solution;    the coloring matter is any of P-Quaterphenyl, Stilbene 420, Coumarin 440, Coumarin 481, Coumarin 485, Coumarin 500, or Coumarin 515; and    a solution prepared by dissolving the coloring matter into a dimethylformamide solvent is added to the Au +  aqueous solution.    
   
   
       5 . The photoreduction method for metal complex ions as claimed in  claim 4 , wherein: 
 a concentration of the coloring matter is 0.1 wt % with respect to the dimethylformamide solvent.    
   
   
       6 . The photoreduction method for metal complex ions as claimed in  claim 1 , wherein: 
 the material is Ag +  aqueous solution;    the coloring matter is any of Stilbene 420, Coumarin 440, Coumarin 504, or Coumarin 515; and    a solution prepared by dissolving the coloring matter into an ethanol solvent is added to the Ag +  aqueous solution.    
   
   
       7 . The photoreduction method for metal complex ions as claimed in  claim 6 , wherein: 
 a concentration of the coloring matter is set out at the amount of saturation with respect to the ethanol solvent.