Preparation of Modified Organic Core Materials and Metallic Shell Composite Microspheres

Abstract

The present invention relates to a preparation of modified organic core materials and metallic shell composite microspheres, in which, the surface zeta potential of an organic core materials can attract the opposite zeta potential of the polyelectrolyte and form a polyelectrolyte layer so as to modify the surface of organic core materials. Moreover, the polyelectrolyte layer could attract a first metal ions, particles or complexes added later in suitable condition such that the surface of organic core materials could be metallized and covered with a first metal layer. Furthermore, the organic core materials could be covered with at least one surface metal layer. The first metal layer can be modified by second metal layer with redox-transmetalation® technology to obtain multi-metal layers organic-metallic composite structure.

What is claimed is: 
     
         1 . A preparation of modified organic core materials and metallic shell composite microspheres, comprising steps of:
 (1) adding an organic substrate  1  into a solvent to obtain a slurry;   (2) adding a first polyelectrolyte  2  into the slurry, wherein the zeta potential of the first polyelectrolyte  2  is opposite to the surface zeta potential of the organic substrate  1 ;   (3) adding a second polyelectrolyte  3  into the slurry, wherein the zeta potential of the second polyelectrolyte  3  is opposite to the zeta potential of the first polyelectrolyte  2 ;   (4) adding a first metal compound  4  into the slurry; and   (5) adding a reductant  5  into the slurry for making the first metal compound  4  be metalized, so as to form a first metal layer  6  on the surface of the organic substrate  1 .   
     
     
         2 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 1  further comprises the steps of:
 (6) adding a second metal compound  7  into the slurry; and 
 (7) the first metal layer  6  being modified to a second metal layer  8  after occurring an ion exchange spontaneously between the second metal compound  7  and the first metal compound  4  of the first metal layer  6  through redox-transmetalation. 
 
     
     
         3 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 2 , wherein the surface of organic substrate  1  is covered with  at least one metal layer. 
     
     
         4 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 1 , wherein the solvent is water. 
     
     
         5 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 1 , wherein the first polyelectrolyte  2  and the second polyelectrolyte  3  are selected from the group consisting of: Poly (allylamine hydrochloride) (PAH), Poly (diallyldimethylammonium chloride) (PDDA), Poly (acrylic acid) (PAA), and Poly (styrene sulfonate) (PSS). 
     
     
         6 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 1 , wherein the organic substrate  1  is an organic material with polyester functional group. 
     
     
         7 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 6 , wherein the organic material is Polymethylmethacrylate. 
     
     
         8 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 1 , wherein the first metal compound  4  and the second metal compound  7  are selected from the group consisting of: metal ion, metal particles and metal complexes. 
     
     
         9 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 8 , wherein aforesaid metal ion is selected from the group consisting of: Ni ion and Au ion. 
     
     
         10 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 8 , wherein aforesaid metal particles are selected from the group consisting of: Ni particles and Au particles. 
     
     
         11 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 8 , wherein aforesaid metal complexes are selected from the group consisting of: Ni complexes and Au complexes. 
     
     
         12 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 1 , wherein the reductant  5  is selected from the group consisting of: Dimethylamine borane (DMAB) and NaBH 4 . 
     
     
         13 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 1 , wherein the thickness of the first metal layer  6  and the second metal layer  8  is ranged from 50 nm to 250 nm. 
     
     
         14 . The preparation of modified organic core materials and metallic shell composite microspheres of  claim 1 , wherein the organic substrate  1  is a microsphere having a diameter ranged from 200 nm to 8 μm.