Fully printed sensor with internal ion reservoirs
A printed electric circuit comprises a printed planar substrate. The printed planar surface comprises one or more traces integrated into the printed planar structure. The one or more traces comprise a hydrophilic additive to create ion reservoirs within an organic semiconductor layer.
1 . A printed electric circuit, the printed electric circuit comprising:
a printed planar substrate, the printed planar substrate comprising one or more traces integrated into the printed electric circuit;
wherein the one or more traces comprise a hydrophilic additive to create ion reservoirs within an organic semiconductor layer; and
a printed PEDOT:PSS ink layer forming the organic semiconductor layer, wherein the printed PEDOT:PSS ink layer has a thickness between 1 μm and 2.5 μm.
2 . The printed electric circuit as recited in claim 1 , further comprising:
one or more contact pads configured to communicate with a source measure unit (SMU).
3 . The printed electric circuit as recited in claim 1 , wherein the hydrophilic additive comprises a sugar alcohol additive.
4 . The printed electric circuit as recited in claim 3 , wherein the sugar alcohol additive comprises sorbitol.
5 . The printed electric circuit as recited in claim 3 , wherein the sugar alcohol additive is mixed with the PEDOT:PSS ink layer.
6 . The printed electric circuit as recited in claim 3 , wherein the sugar alcohol additive comprises at least one of the following: mannitol, xylitol, glycerol, lactitol, erythritol, isomalt, maltitol, arabitol, and hydrogenated starch hydrolysates (HSH).
7 . The printed electric circuit as recited in claim 1 , wherein the hydrophilic additive further comprises at least one of the following: methyl cellulose, hydroxyethyl cellulose, sucrose, fructose, lactose, carboxymethylcellulose, carboxymethylchitosan.
8 . The printed electric circuit as recited in claim 1 , wherein the printed electric circuit further comprises an ion selective organic electrochemical transistor (OECT).
9 . The printed electric circuit as recited in claim 8 , wherein the OECT comprises:
a first layer comprising an Ag ink,
a second layer comprising an Ag/AgCl ink,
a third layer comprising a PEDOT:PSS ink, and
a fourth layer comprising dielectric ink.
10 . The printed electric circuit as recited in claim 1 , wherein the printed electric circuit further comprises one or more of the following: a transistor, an electrode, a sensor, or a capacitor.
11 . The printed electric circuit as recited in claim 1 , further comprising an ion selective membrane.
12 . The printed electric circuit as recited in claim 11 , wherein the ion selective membrane comprises a potassium ionophore.
13 . A method for printing an electric circuit, the method comprising:
printing onto a substrate a first layer comprising an Ag ink,
printing onto the substrate a second layer comprising an Ag/AgCl ink,
printing onto the substrate a third layer comprising a PEDOT:PSS ink,
wherein the third layer further comprises a hydrophilic additive to create ion reservoirs within the third layer, wherein printing the third layer comprises forming an organic semiconducting channel with a thickness between 1 μm and 2.5 μm, and
printing onto the substrate a fourth layer comprising dielectric ink.
14 . The method as recited in claim 13 , wherein the hydrophilic additive comprises a sugar alcohol.
15 . The method as recited in claim 13 , further comprising:
placing an ion selective membrane onto the fourth layer.