Systems and methods for nanowire growth and manufacturing
View Patent ↗The present invention is directed to compositions of matter, systems, and methods to manufacture nanowires. In an embodiment, a method to produce a catalytic-coated nanowire growth substrate for nanowire growth is disclosed which comprises: (a) depositing a buffer layer on a substrate; (b) treating the buffer layer with boiled water or steam to enhance interactions between the buffer layer and catalyst particles; and (c) depositing catalytic particles on a surface of the buffer layer. Methods to develop and use this catalytic-coated nanowire growth substrate are disclosed.
1. A method to produce a catalytic-coated nanowire growth substrate for nanowire growth, comprising:
(a) depositing a buffer layer on a substrate;
(b) treating the buffer layer with boiled water or steam following the depositing in step (a) to enhance interactions between the buffer layer and catalyst particles; and
(c) depositing catalytic particles on a surface of the buffer layer following the treating in step (b).
2. The method of claim 1 , wherein the buffer layer provides a charged surface that attracts catalytic particles.
3. The method of claim 1 , wherein the buffer layer provides a protection layer that prevents reactions between the substrate and catalytic particles.
4. The method of claim 1 , wherein the buffer layer provides a protection layer that prevents chemical reactions between the substrate and catalytic particles.
5. The method of claim 1 , wherein the substrate comprises a semiconductor, metal, ceramic, glass or plastic.
6. The method of claim 1 , wherein the substrate is in a form of a wafer, foil, block, tube or foam.
7. The method of claim 1 , wherein the buffer layer is Al 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , MgO or ZnO.
8. The method of claim 1 , wherein step (a) comprises oxidation, nitridation, sputtering, spraying, dip coating, e-beam evaporation, spin coating, roll-to-roll coating, chemical vapor deposition, or plasma enhanced chemical vapor deposition to deposit the buffer layer on the substrate.
9. The method of claim 1 , wherein step (b) treating the buffer layer comprises boiling the buffer layer in water.
10. The method of claim 1 , wherein step (b) treating the buffer layer comprises steaming the buffer layer.
11. The method of claim 1 , wherein step (c) comprises using charge induced self assembly, chemical functional group induced assembly, spin coating, or dip coating to deposit catalytic particles on the surface of the buffer layer.
12. A method to grow silicon nanowires, comprising:
(a) depositing Al 2 O 3 on a silicon substrate;
(b) treating the Al 2 O 3 coated substrate in boiling water following the depositing in step (a);
(c) soaking the Al 2 O 3 coated silicon substrate in a Au colloid solution following the treating in step (b); and
(d) growing nanowires from the Au colloid particles deposited in step (c) above on the Al 2 O 3 coated silicon substrate.
13. A method to grow oriented silicon nanowires, comprising:
(a) depositing ZnO on a silicon substrate;
(b) soaking the ZnO coated silicon substrate produced in step (a) in an Au colloid solution; and
(c) growing oriented silicon nanowires.
14. The method of claim 13 , wherein step (c) comprises introducing SiCl 4 to the ZnO coated Si substrate to grow oriented silicon nanowires.
15. The method of claim 13 , wherein in step (a) the silicon substrate is a silicon <111> substrate.