Horizontal Carbon Nanotubes by Vertical Growth and Rolling
Horizontal carbon nanotubes may be used for on-die routing and other applications. In one example, a catalyst is applied to a plurality of different points on a substrate. Carbon nanotubes are then grown vertically on the plurality of different points to form a plurality of vertical carbon nanotube structures on the substrate. The vertical carbon nanotuhe structures are then rolled to form horizontal carbon nanotube structures.
1. A method comprising:
applying a catalyst to a plurality of different points on a substrate;
growing carbon nanotubes vertically on the plurality of different points to form a plurality of vertical carbon nanotube structures on the substrate; and
rolling the vertical carbon nanotube structures to form horizontal carbon nanotube structures.
2. The method of claim 1 , wherein growing carbon nanotubes comprises applying at least one of chemical vapor deposition (CVD), plasma enhanced chemical vapor deposition (PECVD), physical vapor deposition (PVD), laser ablation, and arc discharge to the catalyst and substrate.
3. The method of claim 1 , wherein applying the catalyst comprises applying a plurality of metal bumps to the substrate.
4. The method of claim 1 , wherein rolling the carbon nanotube structures comprises forming interconnect structures on the substrate to couple electronic components.
5. The method of claim 4 , further comprising applying a nano-particle paste containing carbon nanotubes to the horizontal structures to electrically couple horizontal structures.
6. The method of claim 5 , wherein applying a nano-particle paste comprises printing the paste.
7. The method of claim 5 wherein applying the nano-particle paste comprises ink-jet printing, the paste comprising:
a dispersant;
a stabilizer; and
carbon nanotubes.
8. The method of claim 7 , wherein the carbon nanotubes of the paste comprise black powder carbon nanotubes.
9. The method of claim 7 , wherein the paste further comprises metal nano-particles.
10. The method of claim 9 , wherein the metal comprises copper.
11. The method of claim 5 , further comprising curing the paste by sintering after applying.
12. The method of claim 11 , further comprising applying a layer of additional metal paste over the cured metal paste.
13. The method of claim 1 , further comprising growing additional carbon nanotubes vertically on the horizontal carbon nanotube structures.
14. The method of claim 1 , further comprising applying the catalyst with a size selected based on the desired size of the vertical carbon nanotube structure.