Organic thin film transistors and the use thereof in sensing applications

1. Use of an organic thin film transistor based biosensor device for sensing a compound in a sample/analyte, the device including:

(i) a gate electrode, wherein the gate electrode comprises a porous matrix comprising a sulfonated tetrafluoroethylene-based fluoropolymer-copolymer;

(ii) a dielectric layer;

(iii) a semiconducting layer including at least one organic compound;

(iv) a source electrode;

(v) a drain electrode;

(vi) a substrate; and

(vii) an enzyme located in, or forming part of any one of (i)-(vi).

2. The use of claim 1 , wherein the semiconducting layer is disposed above and in between the source electrode and the drain electrode.

3. The use of claim 1 , wherein the source electrode and the drain electrode are disposed above the substrate.

4. The use of claim 1 , wherein the sulfonated tetrafluoroethylene-based fluoropolymer-copolymer is a copolymer comprising a tetrafluoroethylene backbone and perfluoroalkyl ether groups terminated with sulfonate groups.

5. The use of claim 4 , wherein the sulfonated tetrafluoroethylene-based fluoropolymer-copolymer is ethanesulfonic acid, 2-[1-[difluoro[(1,2,2-trifluoroethenyl)oxy]methyl]-1,2,2,2-tetrafluoroethoxy]-1,1,2,2-tetrafluoro-, polymer with 1,1,2,2-tetrafluoroethene.

6. The use of claim 1 , wherein the dielectric layer comprises poly(4-vinylphenol) or lithium perchlorate-doped poly(4-vinylpyridine).

7. The use of claim 1 , wherein the enzyme is located in, or forms part of, the gate electrode.

8. The use of claim 1 , wherein the enzyme is located in, or forms part of, the dielectric layer.

9. The use of claim 1 , wherein the at least one organic compound is poly(3-hexylthiophene).

10. The use of claim 1 , wherein the semiconducting layer has a thickness between about 5 nm and about 500 nm.

11. The use of claim 1 , wherein the dielectric layer has a thickness between about 50 nm and 750 nm.

12. The use according to claim 1 , wherein the enzyme is glucose oxidase.

13. The use according to claim 1 , wherein the gate electrode comprises a sulfonated tetrafluoroethylene-based fluoropolymer-copolymer and glucose oxidase, the gate electrode being disposed above, and in direct contact with, the dielectric layer, the dielectric layer being disposed above, and in direct contact with, the semiconducting layer, the semiconducting layer being disposed above and in between the source electrode and the drain electrode, and in direct contact with, the source electrode and the drain electrode, the source electrode and the drain electrode being disposed above, and in direct contact with, the substrate.

14. The use of claim 1 , wherein the sample or analyte is a bodily fluid.

15. The use of claim 1 , wherein the sample or analyte is saliva.

16. The use of claim 1 , wherein the compound is glucose.

17. The use of claim 1 , wherein the device has top gate bottom contact configuration such that the gate electrode is disposed above the dielectric layer, and the dielectric layer is disposed above the semiconducting layer.

18. A method for determining a concentration or an amount of a compound in a sample/analyte comprising the compound, the method comprising:

a) providing an organic thin film transistor based biosensor device including:

(i) a gate electrode, wherein the gate electrode comprises a porous matrix comprising a sulfonated tetrafluoroethylene-based fluoropolymer-copolymer;

(ii) a dielectric layer;

(iii) a semiconducting layer including at least one organic compound;

(iv) a source electrode;

(v) a drain electrode;

(vi) a substrate; and

(vii) an enzyme located in, or forming part of any one of (i)-(vi),

b) applying a gate voltage and a drain voltage to the device;

c) contacting the sample/analyte with the device;

d) detecting drain current; and

e) determining the concentration or the amount of the compound based on the magnitude of the drain current.