Purification of metal nanostructures for improved haze in transparent conductors made from the same
View Patent ↗Provided are a method of isolating and purifying metal nanowires from a crude and complex reaction mixture that includes relatively high aspect ratio nanostructures as well as nanostructures of low aspect ratio shapes, and conductive films made of the purified nanostructures.
1. A conductive film comprising:
a conductive network of a plurality of silver nanowires that has a resistance of at least 200 ohm/sq; and
no more than 1500 nanostructures having an aspect ratio of less than 10 per millimeter square area of the conductive film.
2. The conductive film of claim 1 , wherein the conductive film has a haze of no more than 0.5%.
3. The conductive film of claim 1 wherein the conductive film has a resistance of at least 600 ohm/sq; and no more than 500 nanostructures having an aspect ratio of less than 10 per millimeter square area of the conductive film.
4. The conductive film of claim 3 wherein the conductive film has a haze of no more than 0.25%.
5. The conductive film of claim 1 further comprising a viscosity modifier.
6. The conductive film of claim 5 wherein the viscosity modifier and the silver nanowires are in a w/w ratio of 10 to 0.1.
7. The conductive film of claim 1 wherein the viscosity modifier is hydroxypropyl methylcellulose (HPMC).