Patent ID: 11937372
Assignee: YALE UNIVERSITY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 28:
29. A method of making a stretchable circuit board assembly, comprising:
depositing a first layer of GaIn nanoparticles on a first substrate;
depositing a second layer of GaIn nanoparticles on a second substrate;
heating the deposited first and second layers of GaIn nanoparticles in an enclosed furnace to a temperature between 800 and 1000° C. for a time duration between 5 minutes and 60 minutes to form a first and second GaIn film comprising a quantity of liquid GaIn and a plurality of solid particles of Ga2O3 suspended in the quantity of liquid GaIn, the Ga2O3 particles having a median particle size between 8 μm and 25 μm wherein the volumetric ratio of solid particles to liquid metal is between 0.4 and 0.7;
cooling the first and second GaIn films in ambient conditions;
transferring at least a portion of the first GaIn film to a first surface of a stretchable substrate to form at least one first GaIn trace;
transferring at least a portion of the second GaIn film to a second surface of a stretchable substrate to form at least one second GaIn trace, wherein the second surface is opposite the first surface;
securing one or more electrical components to the at least one first and second GaIn traces;
encapsulating the one or more electrical components and the at least one first GaIn trace with a first stretchable encapsulating layer; and
encapsulating the one or more electrical components and the at least one second GaIn trace with a second stretchable encapsulating layer.