Large scale manufacturing of hybrid nanostructured textile sensors
A process for the large-scale manufacturing vertically standing hybrid nanometer scale structures of different geometries including fractal architecture of nanostructure within a nano/micro structures made of flexible materials, on a flexible substrate including textiles is disclosed. The structures increase the surface area of the substrate. The structures maybe coated with materials that are sensitive to various physical parameters or chemicals such as but not limited to humidity, pressure, atmospheric pressure, and electromagnetic signals originating from biological or non-biological sources, volatile gases and pH. The increased surface area achieved through the disclosed process is intended to improve the sensitivity of the sensors formed by coating of the structure and substrate with a material which can be used to sense physical parameters and chemicals as listed previously. An embodiment with the structures on a textile substrate coated with a conductive, malleable and bio-compatible sensing material for use as a biopotential measurement electrode is provided.
1. A method for manufacturing of hybrid nanostructured textile sensors comprising:
embedding polymer nanofibers into a matrix polymer to form a yarn;
dissolving the matrix polymer to expose the polymer nanofibers; and
coating the polymer nanofibers with a film.
2. The method as recited in claim 1 wherein the yarn is a micro denier yarn.
3. The method as recited in claim 1 wherein the micro denier yarn has a helical structure.
4. The method as recited in claim 1 wherein the polymer nanofibers are vertically standing structures.
5. The method as recited in claim 1 wherein the polymer nanofibers are helical structures.
6. The method as recited in claim 1 further comprising the step of:
imparting an electrostatic charge to the yarn prior to the dissolving the matrix polymer.
7. The method as recited in claim 1 wherein the polymer nanofibers are made of a polymer material selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate.
8. The method as recited in claim 1 wherein the polymer nanofibers are made of a polyester.
9. The method as recited in claim 6 wherein the step of imparting further includes performing an electrostatic and/or pneumatic assisted deposition process using a high strength electrostatic field of 2 kV/cm-10 kV/cm.
10. The method as recited in claim 1 wherein the polymer nanofibers are made of a polyurethane.
11. The method as recited in claim 1 wherein the matrix polymer is made of a material selected from the group consisting of polystyrene, polyvinyl alcohol, ethylene vinyl alcohol, polyacrylamide and poly lactic acid.
12. The method as recited in claim 1 wherein the matrix polymer is made of a polyethylene terephthalate modified with sulfonated isocyanate.
13. Themethod as recited in claim 1 wherein the film is a conductive material selected from the group consisting of silver, gold, platinum, polyaniline, polypyrrole and poly(3,4-ethylenedioxythiophene).
14. The method as recited in claim 1 wherein the film is a metal oxide film.
15. The method as recited in claim 1 wherein the film is a piezoelectric material film.
16. The method of claim 1 , further comprising
receiving a fabric piece in a printing press,
printing an adhesive film in a pattern of array of specific shapes on the fabric; and
electrostatic force assisted deposition of the film coated nano-fibers onto the adhesive film on the fabric in a vertically upright position.