US 11,993,860 B2
Ligand exchange of nanocrystal films
Xiaojie Xu, Union City, CA (US); Kyoung Eun Kweon, Pleasonton, CA (US); Christine A. Orme, Oakland, CA (US); Babak Sadigh, Union City, CA (US); and April Sawvel, Union City, CA (US)
Assigned to Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed by Lawrence Livermore National Security, LLC, Livermore, CA (US)
Filed on Jan. 28, 2022, as Appl. No. 17/587,885.
Claims priority of provisional application 63/143,271, filed on Jan. 29, 2021.
Prior Publication US 2022/0243352 A1, Aug. 4, 2022
Int. Cl. C25D 13/02 (2006.01); C01G 21/00 (2006.01); C09K 11/66 (2006.01); C23C 2/04 (2006.01); B82Y 20/00 (2011.01); B82Y 40/00 (2011.01)
CPC C25D 13/02 (2013.01) [C01G 21/00 (2013.01); C09K 11/661 (2013.01); C23C 2/04 (2013.01); B82Y 20/00 (2013.01); B82Y 40/00 (2013.01); C01P 2004/64 (2013.01); C01P 2006/60 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for one-step ligand exchange, the method comprising:
at least partially submerging a substrate in a colloidal mixture of nanocrystals and a first solvent, wherein the nanocrystals have first ligands coupled thereto;
applying an electric field to the colloidal mixture to form a solvated nanocrystal film having a thickness in a range of greater than 100 nm and less than about 2 microns;
removing the solvated nanocrystal film from the first solvent; and
applying a second solvent to the solvated nanocrystal film for ligand exchange,
wherein the second solvent comprises second ligands,
wherein the second solvent is applied to the solvated nanocrystal film for five minutes or less.