Thursday, June 07, 2012

US Patent 8193010 - Microcontact printing of quantum dots

This patent from the University of Texas System discloses a method to transfer a uniform thickness of quantum dots to a substrate using nanoscale stamping. Claim 1 reads:

1. A method of uniformly transferring luminescent quantum dots onto a substrate, comprising:

a) preparing a colloidal suspension of luminescent quantum dots in a hydrophobic solvent, wherein the density of the hydrophobic solvent is from 0.67 g/cm3 to 0.96 g/cm3;

b) dispensing the suspension onto a convex aqueous surface;

c) allowing the hydrophobic solvent to evaporate, thereby forming a film of luminescent quantum dots;

d) contacting the film of luminescent quantum dots with a hydrophobic stamp; and

e) depositing the film of luminescent quantum dots onto a substrate with the hydrophobic stamp.