Illuminating device and method for preparing inorganic nano-material

1. A method for preparing an inorganic nano-material, comprising steps of:

providing a first solution including plural metal ions;

mixing the first solution with a surfactant and adding a reduction agent to generate a second solution, wherein the second solution generates plural metal atoms reduced from the plural metal ions; and

adding an oxidation agent into the second solution for oxidizing the plural metal atoms so as to generate plural metal oxides and form the inorganic nano-material, wherein the oxidation agent is an organic metal salt.

2. A method of claim 1 , wherein the inorganic nano-material comprises the plural metal oxides and the surfactant, and the surfactant covers the plural metal oxides.

3. A method of claim 1 , wherein the plural metal atoms comprise one selected from a group consisting of zinc, copper, manganese, iron, nickel, ruthenium, osmium and a combination thereof.

4. A method of claim 1 , wherein the plural metal oxides comprise one selected from a group consisting of zinc oxide, copper oxide, manganese oxide, iron oxide, nickel oxide, ruthenium oxide, osmium oxide and a combination thereof.

5. A method of claim 1 , wherein the surfactant comprises one selected from a group consisting of a cetyl trimethyl ammonium bromide, a sodium lauryl sulfate and an acetic acid.

6. A method of claim 1 , wherein:

the reduction agent includes one selected from a group consisting of a sodium tetrahydroborate, a carbon atom and a sulfur dioxide.

7. A method for preparing an inorganic nano-material, comprising steps of

providing a solution including plural metal ions;

mixing the solution with a surfactant and reducing the plural metal ions into plural metal atoms; and

adding an ionic solution to cause a metal cluster to grow from a spherical shape to a sea-urchin shape to form the inorganic nano-material.

8. A method of claim 7 , wherein the inorganic nano-material comprises the surfactant and the plural metal atoms, the plural metal atoms form the metal cluster, and the surfactant covers the metal cluster.

9. A method of claim 7 , wherein the ionic solution includes a sodium chloride.

10. A method of claim 7 , wherein the inorganic nano-material includes the surfactant and the metal cluster of the sea-urchin shape, and the surfactant covers the metal cluster of the sea-urchin shape.

11. A method of claim 7 , wherein the plural metal atoms are noble metal atoms including one selected from a group consisting of a gold, a silver, a palladium, a platinum and a combination thereof.

12. A method of claim 7 , wherein the surfactant includes a sodium citrate.

13. A method of claim 7 , wherein the step of reducing the plural metal ions into the plural metal atoms is performed by adding a reduction agent to reduce the plural metal ions into the plural metal atoms, and the reduction agent includes a sodium citrate.