Patent ID: 9695046
Date: 2017-07-04
CPC Classifications: C01B,H01M,Y02E

Claim:
1. A process for cleaning carbon nanotubes, comprising at least the following steps: a) providing a carbon nanotube substrate comprising carbon nanotubes, b) first washing of the carbon nanotube substrate with an acid, where the acid has at least one type of acid anions A1, and b2) optionally intermediate washing of the product from step b) with an additive-free solvent, and c) second washing of the carbon nanotube substrate with a solution, wherein the solution comprises replacement anions A2 of at least one type different from the acid anions A1 of the acid in step b) and the mole fraction of the replacement anions A2 in the solution is greater than the mole fraction of acid anions A1 in the solution, and c2) optionally further washing of the product from step c) with additive-free solvent, and d) isolating the carbon nanotubes.