Stretchable electronics for dentistry applications and method of making the same

1. A method for producing a stretchable conductor and/or electrical connection comprising

providing a stretchable substrate, a liquid metal, a conductive metal and an adhesion material in a same evaporator chamber;

depositing the liquid metal;

depositing the adhesion material;

depositing the conductive metal;

wherein

the liquid metal, the conductive metal and the adhesion material are deposited by evaporation in vacuum;

the liquid metal, the conductive metal and the adhesion material are deposited at different deposition rates, which are variable during the process; and

said adhesion material, said conductive metal and said liquid metal are deposited under the form of layers or combine each other to form a conductive layer on the stretchable substrate.

2. The method according to claim 1 , wherein the adhesion material is deposited before the conductive metal.

3. The method according to claim 1 further comprising a step of depositing the liquid metal onto the stretchable substrate and/or before depositing the adhesion material.

4. The method according to claim 1 , wherein the liquid metal is successively, alternatively or continuously deposited.

5. The method according to claim 1 , wherein the liquid metal has a deposition rate of 0 nm/s while depositing the adhesion material and the conductive metal.

6. The method according to claim 1 further comprising a step of depositing the liquid metal after depositing the adhesion material and before depositing the conductive material.

7. The method according to claim 1 , wherein the liquid metal is continuously deposited by evaporation during the whole process and the deposition of the adhesion material and conductive metal.

8. The method according to claim 1 , wherein the liquid metal is deposited before depositing the adhesion material, during depositing said adhesion material, after depositing said adhesion material and before depositing the conductive material, during depositing said conductive material and after depositing said conductive material.

9. The method according to claim 1 , wherein the deposition by evaporation is made by a physical vapor deposition method selected from a deposition by sublimation process, cathodic arc deposition, electron beam physical vapor deposition, thermal evaporation, evaporative deposition, pulse laser deposition, sputter deposition and/or from chemical vapor deposition, electron beam evaporation, thermal evaporation, electro-plating, molecular beam epitaxy.

10. The method according to claim 1 , wherein the stretchable substrate comprises an elastomeric material.

11. The method according to claim 1 , wherein the liquid metal is selected from gallium, mercury, chromium, alloys or oxides thereof and from metal being liquid or semi-liquid at 90° C. at atmospheric pressure condition; and the adhesion material is metallic selected from Cr, Ti and the conductive material is metallic selected from Au, Ag, Cu, Pt, Pd.

12. The method according to claim 1 , wherein the deposition of the metals and the material onto the stretchable substrate is patterned.