CN103050169A - Flexible transparent electrode and preparation method thereof - Google Patents
Flexible transparent electrode and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a flexible transparent electrode comprising a transparent polymer substrate, and a laminating layer of a silver nanowire film and a grapheme film attached to the transparent substrate. According to the flexible transparent electrode, the silver nanowire film and the grapheme film achieve an unexpected synergistic effect through the laminating layer, and the prepared flexible transparent electrode has high light transmittance, small resistance and good flexibility.
Description
Technical field
The present invention relates to a kind of flexible and transparent electrode and preparation method thereof.
Background technology
Tin indium oxide (ITO) comprises imageing sensor, solar cell (OPV), liquid crystal display, organic electroluminescent (OLED) and touch panel as the transparent conductive film various photoelectric devices that are widely used.Along with the increase of market demand and the requirement of product quality raising, these metal oxides expose series of problems: (1) phosphide element allowable exploitation is limited; (2) they are unstable under acid and alkali condition; (3) their ion diffusion couple polymeric layer pollutes; (4) their inflexibility characteristic can't satisfy the requirement of flexible device; (5) bad at the near infrared region properties of transparency.Therefore the development of new transparent conductive film has important theoretical and practical significance.
At present, the transparent conductive material that is expected to alternative ITO has doping ZnO, conducting polymer (as: poly-3,4-ethene dioxythiophene/polystyrolsulfon acid, poly-3,4-ethylene dioxythiophene/poly styrene sulfonate), carbon nano-tube, Graphene, metal gate and nano silver wire etc.Wherein owing to carbon nano-tube, Graphene and nano silver wire especially are concerned by people in the advantage of the aspects such as flexibility, stability and conductivity.Utilize the Graphene of chemical gaseous phase depositing process preparation to obtain application at touch-screen.But because Graphene is difficult to avoid introducing defective in growth course, its film resistor is mostly at 500 Ω/more than the.When being 90% left and right sides, visible light transmittance rate can obtain film resistor about 100 Ω/ by the transparent conductive film of nano silver wire preparation.The researcher of Rice Univ USA has obtained the composite and flexible transparency electrode (ACS Nano, 2011,5,6472 –s 6479) of film resistor in 5 to 30 Ω/ scope by the Graphene of CVD growth is attached on Au, Cu or the Al metal gate.Because the complicated process of preparation of metal gate is faced with the challenge of the aspects such as size scale and price, therefore still exist difficulty in application facet.The seminar in Texas ,Usa university Jane Austen branch school is compound with mixed uniformly form golden nanometer particle, nano silver wire and graphene oxide, having obtained light transmittance is 70%, and resistance is transparent conductive film (ACS Nano, 2012 about 30 Ω/, 6,5157 – 5163).This seminar also is layered on a small amount of nano silver wire on the graphene film of CVD growth, effectively reduced the interior resistance between the domain in the graphene film, the resistance that makes graphene film by 1000 Ω/ be down to 30-80 Ω/ (Nano Lett.2012,12,5679-5683).The composite construction of Graphene and Nano silver grain, nano wire has also obtained widely research in China, and focusing mostly on is being that predecessor prepares graphene-supported Nano silver grain with graphene oxide.The researcher of University of Electronic Science and Technology has proposed to utilize Graphene to fill the space of nano silver wire film, form to mix pilotaxitic texture, and then improve the nano silver wire film conductivity and with the adhesiveness of substrate.In the above-mentioned report, nano silver wire and Graphene do not form independently membrane structure separately for mixing alternate structure, and the performance boost spaces such as its light transmittance and resistance are very limited.
Summary of the invention
The purpose of this invention is to provide a kind of flexible and transparent electrode and preparation method thereof.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of flexible and transparent electrode comprises the transparent polymer substrate and is attached to nano silver wire film on the transparent substrates and the lamination of graphene film.
Existing obvious boundary between above-mentioned nano silver wire film and the graphene film has realized again the two connection on two-dimentional yardstick, and has produced beyond thought cooperative effect.
In order to satisfy various demands, the laminated construction of described nano silver wire film and graphene film is
Wherein, Ag is expressed as the nano silver wire film, and G is expressed as graphene film, and n is expressed as the number of plies, and its value is 1-10.
In order to guarantee the light transmittance of flexible and transparent electrode, the thickness of described every layer of nano silver wire film is 5-300nm; The thickness of described every layer graphene film is 0.2-20nm.
In order to take into account simultaneously the good light transmittance of flexible and transparent electrode and little resistance, the laminated thickness of described nano silver wire film and graphene film is 5-320nm.
For convenient preparation, guarantee simultaneously properties of product, described graphene film is the graphene film of chemical vapour deposition (CVD) preparation or the graphene film that is prepared by the graphene oxide reduction; Described nano silver wire film is for preparing by spin coating, spraying, self assembly, inkjet printing or method for printing screen.
For convenient preparation, guarantee properties of product, reduce simultaneously cost, described transparent polymer substrate is PETG (PET) substrate, polyimides (PI) substrate, dimethyl silicone polymer (PDMS) substrate, polymethyl methacrylate (PMMA) substrate or Merlon (PC) substrate.
The preparation method of above-mentioned flexible and transparent electrode, described nano silver wire thin film technology is: nano silver wire is dispersed in ethanol, isopropyl alcohol or the nitrogen dimethylformamide solvent, nano silver wire solution, with nano silver wire solution take to spray, be coated with, self assembly, inkjet printing or screen printing mode prepare the nano silver wire film; Described nano silver wire solution concentration is 0.01-10mg/ml.
The technology that the present invention is not particularly limited is prior art.
Nano silver wire film of the present invention and graphene film have reached beyond thought cooperative effect by lamination, and prepared flexible and transparent electrode has higher light transmittance, less resistance and good pliability.
Description of drawings
Fig. 1 is the present invention
The structural representation of the flexible and transparent electrode of shape, wherein n is 1.
Fig. 2 is the present invention
The structural representation of the flexible and transparent electrode of shape, wherein n is 1.
Fig. 3 is the present invention
The structural representation of the flexible and transparent electrode of shape, wherein n is 1.
Fig. 4 is the present invention
The flexible electrode scanning electron microscope (SEM) photograph of shape.
Among the figure, 1 is the nano silver wire film, and 2 is graphene film, and 3 is flexible substrate.
Embodiment
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
1. PETG (PET) transparent flexible substrate outer protective film is removed;
2. nano silver wire is dispersed in the alcohol solvent, getting concentration is the nano silver wire solution of 6mg/ml, takes spraying method at the 1. flexible substrate preparation nano silver wire film of gained of step, and the thickness of gained nano silver wire film is 20nm;
3. the graphene film of CVD growth is transferred on the nano silver wire film, namely at the nano silver wire film graphene film that superposes;
4. the film that will superpose was placed 50 minutes in the environment of 20 ° of C, removed solvent remaining in the superimposed layer, formed
Form structure, wherein n=1 obtains described flexible electrode.
5. the flexible electrode thickness that obtains is 30nm, and its light transmittance is 85%, corresponding film resistor 10 (± 5) Ω/.
1. polyimides (PI) transparent flexible substrate outer protective film is removed, placed on the sol evenning machine;
2. nano silver wire is dispersed in the isopropyl alcohol, getting concentration is the nano silver wire solution of 0.5mg/ml, takes the mode that is coated with at 1. preparation nano silver wire film on the flexible substrate of gained of step, and the thickness of gained nano silver wire film is 50nm;
3. the graphene film of chemical oxidization method preparation is transferred on the nano silver wire film, at the nano silver wire film graphene film that superposes.
4. the film that will superpose was placed 10 minutes in the environment of 120 ° of C, removed solvent remaining in the superimposed layer, formed
Form structure, wherein n=1 obtains described flexible electrode.
5. the flexible electrode thickness that obtains is 52nm, and its light transmittance is 86%, corresponding film resistor 9 (± 5) Ω/.
1. dimethyl silicone polymer (PDMS) transparent flexible substrate outer protective film is removed;
2. nano silver wire is dispersed in the nitrogen dimethylformamide (DMF), getting concentration is the nano silver wire solution of 2mg/ml, take the self assembly mode at 1. preparation nano silver wire film on the flexible substrate of gained of step, the thickness of gained nano silver wire film is 30nm;
3. the graphene film of CVD growth is transferred on the nano silver wire film, at the nano silver wire film graphene film that superposes.
4. the film that will superpose was placed 20 minutes in the environment of 30 ° of C, removed solvent remaining in the superimposed layer, formed
Form structure, wherein n=1 obtains described flexible electrode.
5. the flexible electrode thickness that obtains is 40nm, and its light transmittance is 87%, corresponding film resistor 9 (± 5) Ω/.
Embodiment 4
1. polymethyl methacrylate (PMMA) transparent flexible substrate outer protective film is removed;
2. the graphene film of CVD growth is transferred on the PET film;
3. nano silver wire is dispersed in the ethanol, getting concentration is the nano silver wire solution of 3mg/ml, uses the mode of the spraying nano silver wire film that superposes at graphene film, and the thickness of nano silver wire film is 100nm;
4. the film that will superpose was placed 20 minutes in the environment of 30 ° of C of room temperature, removed solvent remaining in the superimposed layer.Form
Form structure, wherein n=1 obtains described flexible electrode.
5. the flexible electrode thickness that obtains is 115nm, and its light transmittance is 84%, corresponding film resistor 9 (± 5) Ω/.
Embodiment 5
1. Merlon (PC) transparent flexible substrate outer protective film is removed;
2. nano silver wire is dispersed in the ethanol, getting concentration is the nano silver wire solution of 10mg/ml, takes spraying method at the 1. flexible substrate preparation nano silver wire film of gained of step, and the nano silver wire film thickness is at 5nm;
3. the graphene film of CVD growth is transferred on the nano silver wire film, at the nano silver wire film graphene film that superposes;
4. again take spraying method to adhere to the nano silver wire film at superimposed layer, the nano silver wire film thickness is 5nm;
5. the film that will superpose was placed 10 minutes in the environment of 120 ° of C, removed solvent remaining in the superimposed layer, formed
Form structure, wherein n=1 obtains described flexible electrode;
6. the flexible electrode thickness that obtains is 12nm, and its light transmittance is 83%, corresponding film resistor 8 (± 5) Ω/.
Embodiment 6
1. PETG (PET) transparent flexible substrate outer protective film is removed;
2. the graphene film of CVD growth is transferred on the nano silver wire film, graphene film is transferred on the clean pet polymer film;
3. nano silver wire is dispersed in the ethanol, getting concentration is the nano silver wire solution of 1mg/ml, uses the mode of the spraying nano silver wire film that superposes at graphene film.The thickness of nano silver wire film is 90nm;
4. again will adopt the graphene film CVD growth or the chemical oxidization method preparation to transfer on the nano silver wire film;
5. the film that will superpose was placed 12 minutes in 50 ° environment, removed solvent remaining in the superimposed layer, formed
Form structure, wherein n=1 obtains described flexible electrode;
6. the flexible electrode thickness that obtains is 95nm, and its light transmittance is 83%, corresponding film resistor 8 (± 5) Ω/.
Embodiment 7
1. PETG (PET) transparent flexible substrate outer protective film is removed;
2. nano silver wire is dispersed in the ethanol, getting concentration is the nano silver wire solution of 5mg/ml, takes spraying method at the 1. flexible substrate preparation nano silver wire film of gained of step, and the nano silver wire film thickness is 50nm;
3. the graphene film of CVD growth is transferred on the nano silver wire film, at the nano silver wire film graphene film that superposes;
4. again take spraying method to adhere to the nano silver wire film at superimposed layer, the nano silver wire film thickness is 50nm;
5. will adopt the graphene film CVD growth or the chemical oxidization method preparation to transfer on the stack film, graphene film again superposes again;
6. the film that will superpose was placed 15 minutes in 50 ° environment, removed solvent remaining in the superimposed layer, formed
Form structure, wherein n=8 obtains described flexible electrode;
7. the flexible electrode thickness that obtains is 102nm, and its light transmittance is 78%, corresponding film resistor 6 (± 5) Ω/.
Comparative Examples 1
1. PETG (PET) transparent flexible substrate outer protective film is removed;
2. the Graphene with the CVD growth is transferred on the PET, and the thickness of graphene film is 10nm, and light transmittance is 90～96%, and film resistor is at 400～1200 Ω/.
Comparative Examples 2
1. PETG (PET) transparent flexible substrate outer protective film is removed;
2. nano silver wire is dispersed in the ethanol, getting concentration is the nano silver wire solution of 6mg/ml, takes spraying method at the polymeric substrates preparation nano silver wire film of cleaning, and the nano silver wire film thickness is 20nm;
3. the flexible electrical that obtains extremely light transmittance is 83%, corresponding film resistor 40 Ω/.
Comparative Examples 3
According to Nano Lett.2012,12,5679-5683 report is dispersed in nano silver wire on the Graphene, the Graphene after it is modified in the situation of 90% light transmittance its film resistor at 24 (± 3.6) Ω/.But the Graphene branch mode of its use needs high temperature (350 ° of C), can't be applied on the polymer flexibility film.
Comparative Examples 4
Mix with reference to (number of patent application: 201110096775.X, 201110096846.6,201110096782.X, 201110096791.9) graphite oxide and nano silver wire, then be spin-coated on the PE, the light transmittance of the film that obtains near 75%, film resistor 30 Ω/.
Claims (10)
1. flexible and transparent electrode is characterized in that: comprise the transparent polymer substrate and be attached to nano silver wire film on the transparent substrates and the lamination of graphene film.
2. flexible and transparent electrode as claimed in claim 1, it is characterized in that: the structure of the lamination of described nano silver wire film and graphene film is
Wherein, Ag is expressed as the nano silver wire film, and G is expressed as graphene film, and n is expressed as the number of plies, and its value is 1-10.
3. flexible and transparent electrode as claimed in claim 1 or 2, it is characterized in that: the thickness of described every layer of nano silver wire film is 5-300nm.
4. flexible and transparent electrode as claimed in claim 1 or 2, it is characterized in that: the thickness of described every layer graphene film is 0.2-20nm.
5. flexible and transparent electrode as claimed in claim 1 or 2, it is characterized in that: the laminated thickness of described nano silver wire film and graphene film is 5-320nm.
6. flexible and transparent electrode as claimed in claim 1 or 2 is characterized in that: described graphene film is by the chemical vapour deposition (CVD) preparation or by graphene oxide reduction preparation.
7. flexible and transparent electrode as claimed in claim 1 or 2 is characterized in that: described nano silver wire film is for preparing by spin coating, spraying, self assembly, inkjet printing or method for printing screen.
8. flexible and transparent electrode as claimed in claim 1 or 2, it is characterized in that: the transparent polymer substrate is PETG substrate, polyimide substrate, dimethyl silicone polymer substrate, polymethyl methacrylate substrate or polycarbonate substrate.
9. the preparation method of the described flexible and transparent electrode of claim 1-8 any one, it is characterized in that: described nano silver wire thin film technology is: nano silver wire is dispersed in ethanol, isopropyl alcohol or the nitrogen dimethylformamide solvent, nano silver wire solution, with nano silver wire solution take to spray, be coated with, self assembly, inkjet printing or screen printing mode prepare the nano silver wire film.
10. the preparation method of flexible and transparent electrode as claimed in claim 9, it is characterized in that: described nano silver wire solution concentration is 0.01-10mg/ml.
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