Black metallic nanorod arrays and method of manufacturing thereof
A device may include a metallic substrate and a plurality of nanorod arrays arranged on the substrate. The nanorod arrays may be made of porous metallic nanostructures and may appear black in color.
1. A device comprising:
a metallic substrate;
a plurality of nanorod arrays arranged on the substrate;
wherein the plurality of nanorod arrays are made from a process including:
forming metal oxide nanorod arrays on a metallic substrate;
spreading Mg on the metal oxide nanorod arrays;
heating the metal oxide nanorod arrays with Mg, resulting in metallic nanorod arrays;
removing excess Mg and MgO from the metallic nanorod arrays; and
drying the metallic nanorod arrays.
2. The device of claim 1 , wherein at least one of the metallic substrate is foil and the metal is titanium.
3. The device of claim 1 , wherein the metal is selected from a group comprising copper, iron, lead, nickel, tin, vanadium, zinc, aluminum, silicon, and alloys thereof.
4. The device of claim 1 , wherein the device is a lithium-ion or lithium-metal battery, and the metallic substrate is a current collector.
5. A method for forming black metallic nanorod arrays, comprising:
forming metal oxide nanorod arrays on a metallic substrate;
spreading Mg on the metal oxide nanorod arrays;
heating the metal oxide nanorod arrays with Mg, resulting in metallic nanorod arrays;
removing excess Mg and MgO from the metallic nanorod arrays; and
drying the metallic nanorod arrays.
6. The method of claim 5 , wherein the metal oxide is TiO 2 .
7. The method of claim 5 , wherein the metallic substrate is a metal foil.
8. The method of claim 5 , wherein forming the metal oxide nanorod arrays includes:
hydrothermally treating a piece of the metal substrate;
treating the metal substrate with an acid; and
heating the metal substrate.
9. The method of claim 8 , wherein the acid is HCl.
10. The method of claim 8 , further comprising placing two pieces of the metal substrate with nanorod arrays in a crucible before spreading the Mg thereon.
11. The method of claim 10 , wherein heating the metal oxide nanorod arrays with Mg is done in a crucible under argon.
12. The method of claim 5 , wherein removing excess Mg and MgO is done by treating the metallic nanorod arrays with HCl.
13. The method of claim 5 , wherein drying the metallic nanorod arrays is done in a vacuum oven.
14. A method for forming black metallic nanorod arrays, comprising:
forming metal oxide nanorod arrays on a metallic substrate;
spreading Mg on the metal oxide nanorod arrays;
heating the metal oxide nanorod arrays with Mg after said spreading Mg on the metal oxide nanorod arrays, resulting in metallic nanorod arrays;
removing excess Mg and MgO from the metallic nanorod arrays; and
drying the metallic nanorod arrays;
wherein the nanorod arrays are porous and appear black in color.
15. The method of claim 14 , wherein the metal oxide is TiO 2 and the metallic substrate is a Ti foil.
16. The method of claim 14 , wherein forming the metal oxide nanorod arrays includes:
hydrothermally treating a piece of the metal substrate;
treating the metal substrate with an acid; and
heating the metal substrate.
17. The method of claim 14 , further comprising placing two pieces of the metal substrate with nanorod arrays in a crucible before spreading the Mg thereon.
18. The method of claim 17 , wherein heating the metal oxide nanorod arrays with Mg is done in a crucible under argon.
19. The method of claim 14 , wherein removing excess Mg and MgO is done by treating the metallic nanorod arrays with HCl.
20. The method of claim 5 , wherein the metallic nanorod arrays have a black color once dried.