Hybrid nanosilver/liquid metal ink composition and uses thereof
The present disclosure is directed to a hybrid conductive ink including: silver nanoparticles and eutectic low melting point alloy particles, wherein a weight ratio of the eutectic low melting point alloy particles and the silver nanoparticles ranges from 1:20 to 1:5. Also provided herein are methods of forming an interconnect including a) depositing a hybrid conductive ink on a conductive element positioned on a substrate, wherein the hybrid conductive ink comprises silver nanoparticles and eutectic low melting point alloy particles, the eutectic low melting point alloy particles and the silver nanoparticles being in a weight ratio from about 1:20 to about 1:5; b) placing an electronic component onto the hybrid conductive ink; c) heating the substrate, conductive element, hybrid conductive ink and electronic component to a temperature sufficient i) to anneal the silver nanoparticles in the hybrid conductive ink and ii) to melt the low melting point eutectic alloy particles, wherein the melted low melting point eutectic alloy flows to occupy spaces between the annealed silver nanoparticles, d) allowing the melted low melting point eutectic alloy of the hybrid conductive ink to harden and fuse to the electronic component and the conductive element, thereby forming an interconnect. Electrical circuits including conductive traces and, optionally, interconnects formed with the hybrid conductive ink are also provided.
1. A hybrid conductive ink comprising:
a plurality of silver nanoparticles and a plurality of eutectic low melting point alloy particles, wherein a weight ratio of the eutectic low melting point alloy particles and the silver nanoparticles ranges from 1:20 to 1:5, and wherein the plurality of eutectic low melting point alloy particles comprise Field's metal (In 51.0 Bi 32.5 Sn 16.5 ).
2. The hybrid conductive ink of claim 1 , wherein the weight ratio of the plurality of eutectic low melting point alloy particles and the plurality of silver nanoparticles is 1:5.
3. The hybrid conductive ink according to claim 1 , wherein the plurality of silver nanoparticles have an average particle size ranging from about 0.5 to about 100.0 nanometers.
4. A method of forming an interconnect, comprising:
a) depositing a hybrid conductive ink according to claim 1 on a conductive element positioned on a substrate;
b) placing an electronic component onto the hybrid conductive ink; and
c) heating the substrate, conductive element, hybrid conductive ink and electronic component to a temperature sufficient i) to anneal the plurality of silver nanoparticles in the hybrid conductive ink and ii) to melt the plurality of low melting point eutectic alloy particles to form a melted low melting point eutectic alloy, wherein the melted low melting point eutectic alloy flows to occupy spaces between the annealed plurality of silver nanoparticles,
d) allowing the melted low melting point eutectic alloy of the hybrid conductive ink to harden and fuse to the electronic component and the conductive element, thereby forming the interconnect.
5. The method of claim 4 , wherein the weight ratio of the plurality of eutectic low melting point alloy particles and the plurality of silver nanoparticles is 1:5.
6. The method of claim 4 , wherein the sufficient temperature is about 130° C.
7. The method of claim 4 , wherein the substrate is a plastic substrate.
8. The method of claim 7 , wherein the plastic substrate is selected from the group consisting of polyester, polycarbonate, polyimide, polyethylene terephthalate and polyethylene naphthalate (PEN).
9. The method of claim 4 , wherein the hybrid conductive ink is deposited via aerosol ink jet printing.