Method of making micro-channel structure for micro-wires
View Patent ↗A method of making a micro-channel structure and applying a curable ink to the micro-channel structure includes providing a substrate and depositing a single layer of a curable polymer on the substrate, the single curable layer having a layer thickness. One or more micro-channels adapted to receive curable ink are embossed into the single curable layer, the micro-channels having a micro-channel thickness that is in a range of two microns to ten microns less than the layer thickness. The single curable layer is cured to form a single cured layer so that deformations of the micro-channels or the surface of the single cured layer are reduced. Curable ink is coated over the surface and micro-channels of the single cured layer. The curable ink is removed from the surface of the single cured layer and the curable ink is cured.
1. A method of making a transparent micro-wire device including a cured ink located in a micro-channel structure, comprising:
a) providing a substrate having a transparency of greater than 50%, wherein the substrate has a first side opposite and substantially parallel to a second side;
b) depositing a first single layer of a curable polymer on the first side of the substrate, the first single curable layer having a surface and a first layer thickness;
c) embossing one or more first micro-channels into the first single curable layer, the first micro-channels having a first micro-channel thickness that is in a range of two microns to ten microns less than the layer thickness, and curing the first single curable layer to form a first single cured layer having a thickness that is in a range of about four microns to about twelve microns so that deformations of the first micro-channels or the surface of the first single cured layer are reduced;
d) coating a curable ink over the surface and first micro-channels of the first single cured layer;
e) removing the curable ink from the surface of the first single cured layer;
f) curing the curable ink in the first micro-channels;
g) depositing a second single layer of the curable polymer on the second side of the substrate, the second single curable layer having a surface and a second layer thickness;
h) embossing one or more second micro-channels into the second single curable layer, the second micro-channels having a second micro-channel thickness that is in a range of two microns to ten microns less than the second single curable layer thickness, and curing the second single curable layer to form a second single cured layer so that deformations of the second micro-channels or the surface of the second single cured layer are reduced;
i) coating the curable ink over the surface and second micro-channels of the second single cured layer;
j) removing the curable ink from the surface of the second single cured layer; and
k) curing the curable ink in the second micro-channels to provide a transparent micro-wire device.
2. The method of claim 1 , wherein the curable ink includes electrically conductive nano-particles.
3. The method of claim 2 , further including sintering the electrically conductive nano-particles.
4. The method of claim 2 , wherein the electrically conductive nano-particles are silver, a silver alloy, include silver, or have an electrically conductive shell.
5. The method of claim 2 , wherein the steps of curing the curable ink forms an electrically conductive micro-wire in each first and second micro-channel.
6. The method of claim 1 , wherein the curable ink is coated in a liquid state and cured into a solid state.
7. The method of claim 1 , wherein the curable ink has a surface tension of greater than 50 dynes/cm.
8. The method of claim 1 , wherein the surface of the first or second single cured layer has a water contact angle greater than 45 degrees.
9. The method of claim 1 , wherein the reduced deformations are in the first or second micro-channels or on the surface of the respective first or second single curable layer.
10. The method of claim 1 , wherein the reduced deformations are at the corner of the first or second micro-channels and the surface of the respective first or second single cured layer.
11. The method of claim 1 , wherein the first or second single cured layer has multiple sub-layers.
12. The method of claim 1 , wherein the thickness of the first or second micro-channel is in the range of about ten microns to two microns.
13. The method of claim 1 , wherein the width of the first or second micro-channel is in the range of about twelve microns to two microns.
14. The method of claim 1 , wherein the surface of the first or second single cured layer is substantially planar.
15. The method of claim 1 , wherein the thickness of the first single cured layer is substantially equal to the thickness of the second single cured layer.
16. The method of claim 1 , wherein the thickness of the first single cured layer is different from the thickness of the second single cured layer.
17. The method of claim 1 , wherein the first single curable layer is cured in a common step with the second single curable layer.
18. The method of claim 1 , wherein the first single curable layer is cured before the second single curable layer.