Method for Preparing Nano Metallic Particles

Abstract

A method for preparing nano metallic particles comprises the steps of dipping a conductive substrate in an electroplating solution containing metallic ions and performing an electroplating process to form the nano metallic particles on the conductive substrate by the reduction reaction of the metallic ions. The nano metallic particles can be used as a catalyst to perform a chemical vapor deposition process to form carbon nanotubes on the conductive substrate. Subsequently, fluorescent material can be positioned on the carbon nanotubes to form a light-emitting device. When a predetermined voltage is applied between the conductive substrate and the fluorescent material, the carbon nanotubes on the conductive substrate emit electrons due to the point discharge effect, and the electrons bombard the fluorescent material to emit light beams.

1 . A method for preparing nano metallic particles, comprising the steps of:
 dipping a conductive substrate in an electroplating solution containing metallic ions; and   performing an electroplating process to reduce the nano metallic particles on the conductive substrate.   
     
     
         2 . The method for preparing nano metallic particles as claimed in  claim 1 , wherein the surface roughness of the conductive substrate is of nano scale. 
     
     
         3 . The method for preparing nano metallic particles as claimed in  claim 2 , wherein the surface roughness is between 5 nm and 10 μm. 
     
     
         4 . The method for preparing nano metallic particles as claimed in  claim 1 , wherein the conductive substrate includes conductive regions and non-conductive regions. 
     
     
         5 . The method for preparing nano metallic particles as claimed in  claim 1 , wherein the conductive substrate comprises indium tin oxide. 
     
     
         6 . The method for preparing nano metallic particles as claimed in  claim 1 , wherein the metallic ions are magnetic metallic ions. 
     
     
         7 . The method for preparing nano metallic particles as claimed in  claim 1 , wherein the metallic ions are iron ions, cobalt ions or nickel ions. 
     
     
         8 . The method for preparing nano metallic particles as claimed in  claim 1 , further comprising a step of performing a surface roughening process on the surface of the conductive substrate such that the surface roughness of the conductive substrate is of nano scale. 
     
     
         9 . The method for preparing nano metallic particles as claimed in  claim 8 , wherein the surface roughening process is a polishing process or a plasma bombarding process. 
     
     
         10 . The method for preparing nano metallic particles as claimed in  claim 1 , wherein the electroplating process is a cyclic voltammery electroplating process. 
     
     
         11 . The method for preparing nano metallic particles as claimed in  claim 1 , wherein the size of the nano metallic particles is between 1 nm and 150 nm. 
     
     
         12 . The method for preparing nano metallic particles as claimed in  claim 1 , further comprising a step of performing a chemical vapor deposition process by using the nano metallic particles as a catalyst to form carbon nanotubes on the conductive substrate. 
     
     
         13 . The method for preparing nano metallic particles as claimed in  claim 12 , wherein the surface roughness of the conductive substrate is of nano scale. 
     
     
         14 . The method for preparing nano metallic particles as claimed in  claim 12 , wherein the surface roughness of the conductive substrate is between 5 nm and 10 μm. 
     
     
         15 . The method for preparing nano metallic particles as claimed in  claim 12 , wherein the conductive substrate includes conductive regions and non-conductive regions. 
     
     
         16 . The method for preparing nano metallic particles as claimed in  claim 12 , further comprising a polishing process or a plasma bombarding process on the surface of the conductive substrate such that the surface roughness of the conductive substrate is of nano scale. 
     
     
         17 . The method for preparing nano metallic particles as claimed in  claim 12 , wherein the electroplating process is a cyclic voltammery electroplating process. 
     
     
         18 . The method for preparing nano metallic particles as claimed in  claim 1 , further comprising the step of:
 performing a chemical vapor deposition process by using the nano metallic particles as a catalyst to form carbon nanotubes on the conductive substrate; and   forming a fluorescent material on the carbon nanotubes to form a light-emitting device.   
     
     
         19 . The method for preparing nano metallic particles as claimed in  claim 18 , wherein the surface roughness of the conductive substrate is of nano scale. 
     
     
         20 . The method for preparing nano metallic particles as claimed in  claim 18 , wherein the surface roughness of the conductive substrate is between 5 nm and 10 μm. 
     
     
         21 . The method for preparing nano metallic particles as claimed in  claim 18 , wherein the conductive substrate includes conductive regions and non-conductive regions. 
     
     
         22 . The method for preparing nano metallic particles as claimed in  claim 18 , further comprising a polishing process or a plasma bombarding process on the surface of the conductive substrate such that the surface roughness of the conductive substrate is of nano scale. 
     
     
         23 . The method for preparing nano metallic particles as claimed in  claim 18 , wherein the electroplating process is a cyclic voltammery electroplating process.