Conductive layered structure, electrode and supercapacitor comprising the conductive layered structure, and method for preparing the conductive layered structure

Patent metadata

Field	Value
Publication number	US-9224542-B2
Application number	US-201313951977-A
Country	US
Kind code	B2
Filing date	Jul 26, 2013
Priority date	Jul 26, 2012
Publication date	Dec 29, 2015
Grant date	Dec 29, 2015

Abstract

Provided are a conductive layered structure including a DNA hydrogel and a composite layer disposed on the DNA hydrogel. The composite layer may include a polymer electrolyte and a conductive material. Also provided are an electrode and a supercapacitor, each including the conductive layered structure. Further provided is a method of manufacturing the conductive layered structure. Thus, a biocompatible, implantable electrode having a large specific surface area and a high conductivity may be manufactured through simple processes.

First claim

What is claimed is:

1. A conductive layered structure comprising:
a DNA hydrogel; and
a composite layer comprising a polymer electrolyte and a conductive material, the composite layer being disposed on the DNA hydrogel.

2. The conductive layered structure of claim 1 , wherein the conductive material is a conductive polymer, a carbon nanotube, or a reduced graphene oxide.

3. The conductive layered structure of claim 1 , wherein the conductive material is a carbon nanotube, and the composite layer further comprises polyaniline (PANI).

4. The conductive layered structure of claim 1 , wherein the DNA hydrogel is bound to the composite layer by electrostatic attraction.

5. The conductive layered structure of claim 1 , wherein the DNA hydrogel is formed by cross-linking at least one of X-shaped branched DNA, Y-shaped branched DNA, and T-shaped branched DNA.

6. The conductive layered structure of claim 1 , wherein the composite layer has a multi-layer structure including 2 to 20 layers.

7. The conductive layered structure of claim 6 , wherein the composite layer is an alternating stack of a polymer electrolyte layer having positive charges and a polymer electrolyte layer having negative charges, wherein a conductive material is dispersed in at least one layer of the composite layer.

8. The conductive layered structure of claim 7 , wherein the polymer electrolyte having positive charges is at least one selected from among (poly(diallyldimethyl ammonium chloride) (PDADMAC), poly(allylamine hydrochloride) (PAH), poly(ethyleneimine) (PEI), and poly(dimethylamino-2-ethyl methacrylate) (PDMAEMA).

9. The conductive layered structure of claim 7 , wherein the polymer electrolyte having negative charges is at least one selected from among poly(styrene sulfonate) (PSS), poly(acrylic acid) (PAA), poly(vinylsulfonate) (PVS), and poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO).

10. The conductive layered structure of claim 1 , wherein the conductive polymer is water-dispersible.

11. The conductive layered structure of claim 10 , wherein the conductive polymer is at least one selected from among polyaniline, polythiophene, polypyrrole, and poly (3,4-ethylene dioxythiophene).

12. The conductive layered structure of claim 1 , wherein the composite layer further comprises a PAH layer, a PAA-SWCNT layer, and a PANI layer, the composite layer being disposed to be symmetrically present on both sides of the DNA hydrogel.

13. An electrode comprising:
a current collector; and
an electrode active material disposed on the current collector, wherein the electrode active material comprises:
a DNA hydrogel; and
a composite layer comprising a polymer electrolyte and a conductive material, the composite layer being disposed on the DNA hydrogel.

14. The electrode of claim 13 , wherein the DNA hydrogel and the composite layer are bound to each other by electrostatic attraction.

15. The electrode of claim 13 , wherein the DNA hydrogel is formed by cross-linking at least one of X-shaped DNA, Y-shaped DNA, and T-shaped DNA.

16. The electrode of claim 13 , wherein the composite layer has a multi-layer structure including 2 to 20 layers.

17. The electrode of claim 16 , wherein the composite layer is disposed to be symmetrical on both sides with respect to the DNA hydrogel.

18. The electrode of claim 16 , wherein the composite layer is an alternating stack of a polymer electrolyte layer having positive charges and a polymer electrolyte layer having negative charges, wherein a conductive material is dispersed in at least one layer of the composite layer.

19. The electrode of claim 18 , wherein the polymer electrolyte having positive charges is at least one selected from among (poly(diallyldimethyl ammonium chloride) (PDADMAC), poly(allylamine hydrochloride) (PAH), poly(ethyleneimine) (PEI), and poly(dimethylamino-2-ethyl methacrylate) (PDMAEMA).

20. The electrode of claim 18 , wherein the polymer electrolyte having negative charges is at least one selected from among poly(styrene sulfonate) (PSS), poly(acrylic acid) (PAA), poly(vinylsulfonate) (PVS), and poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO).

21. The electrode of claim 13 , wherein the current collector is a biocompatible current collector.

22. The electrode of claim 21 , wherein the biocompatible current collector comprises at least one metal selected from among gold (Au), silver (Ag), platinum (Pt), titanium (Ti), and iron (Fe).

23. A method of manufacturing a conductive layered structure, the method comprising:
preparing a DNA hydrogel;
immersing the DNA hydrogel in a first polymer electrolyte solution having a first polarity opposite to the DNA hydrogel;
drying the DNA hydrogel having the first polymer electrolyte solution, to form a first polymer electrolyte layer disposed on a surface of the DNA hydrogel;
immersing the DNA hydrogel having the first polymer electrolyte layer in a second polymer electrolyte solution having a second polarity opposite to the first polarity; and
drying the DNA hydrogel having the first polymer electrolyte layer and the second polymer electrolyte solution, to form a second polymer electrolyte layer disposed on the first polymer electrolyte layer which is further disposed on the DNA hydrogel,
wherein the second polymer electrolyte layer is a composite layer comprising a conductive material dispersed in the second polymer electrolyte layer.

24. The method of claim 23 , further comprising:
immersing the DNA hydrogel having the first and the second polymer electrolyte layers disposed on the DNA hydrogel in a third polymer electrolyte solution having a polarity opposite to the polarity of the second polymer electrolyte layer on the DNA hydrogel to form a DNA hydrogel having the first and the second polymer electrolyte layers disposed on the DNA hydrogel and the third polymer electrolyte disposed on the second polymer electrolyte layer;
drying the immersed DNA hydrogel to form a stack of layers disposed on the DNA hydrogel in the following sequence: the first polymer electrolyte layer, the second polymer electrolyte layer and the third polymer electrolyte layer; and
repeating the immersing and the drying to form an additional polymer electrolyte layer disposed on the stack of layers;
wherein one or more layers of the polymer electrolyte layers are composite layers in which a conductive material is dispersed in the polymer electrolyte.

25. The method of claim 23 , wherein the conductive material is a conductive polymer, a carbon nanotube, or a reduced graphene oxide.

26. The method of claim 23 , wherein the first polymer electrolyte solution and the second polymer electrolyte solution comprise a polymer electrolyte in a concentration of about 10 mM to about 100 mM.

27. The method of claim 23 , wherein the second polymer electrolyte layer comprises about 0.5 wt % to about 2.0 wt % of a conductive polymer.

28. The method of claim 23 , wherein the preparing a DNA hydrogel comprises:
preparing branched DNA by hybridization of a single-stranded DNA; and
cross-linking the branched DNA.

29. The method of claim 28 , wherein the branched DNA is an X-shaped branched DNA, a Y-shaped branched DNA, or a T-shaped branched DNA.

30. The method of claim 23 , wherein the drying is

Assignees

• Samsung Electronics Co Ltd

Inventors

• Hur Jae-Hyun
• Park No-Kyoung
• Im Kyu-Hyun
• Hwang Sung-Woo

Classifications

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/30 Primary

  characterised by their material · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01G11/36

  Nanostructures, e.g. nanofibres, nanotubes or fullerenes · CPC title

• H01G11/24

  characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor · CPC title