CN104835729B - A kind of template thermal field induction manufacturing process of flexible reduced graphene patterned electrodes - Google Patents

Abstract

A template thermal field induction forming method for a flexible reduced graphene patterned electrode, first processing a microstructure with a corresponding pattern on the surface of the metal template, using a heat source to heat the metal template, and then using mechanical pressure to make the metal template touch the coated surface. The graphene oxide film on the surface of the flexible substrate, and finally use mechanical force to remove the metal template from the surface of the graphene oxide film, that is, a patterned reduced graphene is obtained on the surface of the flexible substrate, wherein the pattern of the patterned reduced graphene is consistent with the The microstructure of the high-temperature metal template is consistent, and the invention can produce high-resolution graphene patterns with high efficiency, low cost, and large scale, and is suitable for large-scale manufacturing of flexible electronics, flexible displays, wearable electronics, and flexible energy storage devices. Provided technical support.

Description

A Template Thermal Field Induced Forming Method for Flexible Reduced Graphene Patterned Electrode

technical field

The invention belongs to the technical field of micro-manufacturing, and in particular relates to a template thermal field-induced forming method for a flexible reduced graphene patterned electrode.

Background technique

The emergence of graphene materials has enabled the explosive development of flexible electronics in recent years. Graphene materials have excellent electrical, mechanical, and chemical properties. Patterned flexible graphene electrodes have extremely broad potential application values in the fields of flexible microelectronics, optoelectronics, and electrochemical energy storage. For example, the current flexible field-effect transistors, Specific device fields such as flexible thin-film solar cells, flexible electrochemical memories, and flexible displays are competing to use patterned graphene electrodes to replace traditional electrode patterns. Therefore, achieving high-efficiency, low-cost, and large-scale manufacturing of graphene graphics is the primary issue in the development of graphene-based flexible electronic/photonic devices.

In order to manufacture patterned graphene electrodes, scholars at home and abroad have developed a variety of different forming methods, such as using inkjet printing technology to spray graphene ink on the substrate point by point to form a certain graphene pattern, Contact scanning on the graphene oxide film with a high-temperature atomic force probe can realize the reduced graphene pattern on the scanning track, and the reduced graphene pattern can be obtained by scanning and direct writing on the surface of the graphene oxide film by using a laser. However, the above-mentioned inkjet printing process, thermal probe scanning process, and laser direct writing process are all serial processing methods, and it is difficult to achieve low-cost, high-efficiency, and large-scale manufacturing of patterned graphene electrodes, which has become a limitation for graphene. The key technical bottleneck in the development of flexible-based electronic devices, photonic devices, electrochemical devices, etc. requires the development of a new manufacturing method in principle to achieve low-cost, high-efficiency, and large-scale manufacturing of patterned graphene electrodes.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a template thermal field-induced forming method for a flexible reduced graphene patterned electrode, which has high efficiency, low cost, and large-scale manufacturing capabilities.

In order to achieve the above object, the technical scheme that the present invention takes is:

A template thermal field-induced forming method for a flexible reduced graphene patterned electrode, comprising the following steps:

1) Processing a microstructure with a corresponding pattern on the surface of the metal template 1, heating the metal template 1 with a heat source 2, so that the temperature of the metal template 1 is 200°C to 800°C;

2) Then utilize mechanical pressure 3 to make the metal template 1 contact the graphene oxide film 4 coated on the surface of the flexible substrate 5, wherein the applied mechanical pressure 3 is limited to ensure that the metal template 1 is in close contact with the graphene oxide film 4 , the contact time is between 1 millisecond and 1 minute;

3) Finally, the mechanical force 6 is used to remove the metal template 1 from the surface of the graphene oxide film 4, that is, the patterned reduced graphene 7 is obtained on the surface of the flexible substrate 5, wherein the pattern of the patterned reduced graphene 7 and the high-temperature metal The microstructure of template 1 was consistent.

The metal template 1 is a metal with high thermal conductivity, including copper, stainless steel, nickel or chromium.

The thickness of the graphene oxide film 4 is 0.1 micron to 100 micron.

Described flexible substrate 5 is cellulose paper, cotton cloth, polyimide film (PI film) or high temperature resistant polyester film (PET film),

The invention can manufacture high-resolution graphene patterns with high efficiency, low cost and large scale, and provides technical support for large-scale manufacturing of flexible electronics, flexible displays, wearable electronics, flexible energy storage devices, and the like.

Description of drawings

Figure 1 is a diagram of the heating process of the metal template.

Fig. 2 is a diagram of template thermal field induction process.

Figure 3 is a schematic diagram of the forming and separation of the reduced graphene electrode.

Fig. 4a is the physical figure of the metal template of the embodiment; Fig. 4b is a patterned reduced graphene electrode diagram on the surface of photo paper; Fig. 4c is a scanning electron microscope characterization diagram of the reduced graphene electrode pattern, and Fig. 4d is a partial enlarged view of Fig. 4c , Fig. 4e is an optical microscope enlarged image of the reduced graphene electrode pattern.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

A template thermal field-induced forming method for a flexible reduced graphene patterned electrode, comprising the following steps:

1) With reference to Figure 1, a relief structure is processed on the surface of the metal template 1, and the material of the metal template 1 is a metal with a high thermal conductivity coefficient such as copper, stainless steel, nickel, chromium, etc., and the metal template 1 is heated by a heat source 2 to make the metal The temperature of template 1 is between 200°C and 800°C;

2) With reference to Fig. 2, utilize mechanical pressure 3 to make metal template 1 contact the graphene oxide film 4 that is coated on flexible substrate 5 surfaces then, flexible substrate 5 is cellulose paper, cotton cloth, polyimide film (PI film) or high temperature resistant polyester film (PET film), the thickness of graphene oxide film 4 is 0.1 micron to 100 micron, the size of mechanical pressure 3 is advisable to make metal template 1 closely contact graphene oxide film 4, contact time between 1 millisecond and 1 minute,

3) With reference to Fig. 3, utilize mechanical force 6 to remove metal template 1 from graphene oxide film 4 surfaces at last, promptly obtain patterned reduced graphene 7 on flexible substrate 5 surface, wherein the patterned reduced graphene 7 The pattern is consistent with the microstructure of the metal template 1.

The present invention will be described in detail below in conjunction with the embodiments.

In order to demonstrate the feasibility and high efficiency of thermal field induction of flexible reduced graphene patterned electrode template, this example uses a high-temperature stainless steel template to perform patterned thermally induced reduction of graphene oxide. Referring to Figure 4, GO in the figure is graphite oxide rGO is the English abbreviation of reduced graphene (reduced Graphene Oxide). In the embodiment, firstly, the microstructure of the interdigitated pattern is milled on the surface of the stainless steel block by using the milling method to obtain the metal template. Referring to Figure 4a, the metal template is heated by a household electric furnace at a heating temperature of 650°C; The coating method sprays a layer of graphene oxide film on the surface of the photo paper. Referring to Figure 4b, the thickness of the graphene oxide film is 2 microns; the metal template contacts the graphene oxide film and leaves quickly, and the surface of the photo paper can be obtained. Interdigitated patterned reduced graphene patterned electrode, Figure 4c and Figure 4d are scanning electron microscope representations of the reduced graphene electrode pattern, and Figure 4e is an optical microscope enlarged view of the reduced graphene electrode pattern.

Claims (4)

1. the template thermal field induction manufacturing process of a kind of flexible reduced graphene patterned electrodes, it is characterised in that including following Step：

1) in the figuratum micro-structural of metal form (1) Surface Machining, metal form (1) is heated using thermal source (2), made The temperature of metal form (1) is at 200 DEG C~800 DEG C；

2) and then using mechanical pressure (3) metal form (1) is made to touch the graphene oxide coated in flexible substrate (5) surface Film (4), the mechanical pressure (3) applied in it are to ensure that metal form (1) is in close contact with graphene oxide film (4) Limit, time of contact is between 1 millisecond to 1 minute；

3) finally metal form (1) is removed from graphene oxide film (4) surface using mechanical force (6), i.e., in flexible substrate (5) surface obtains patterned reduced graphene (7), wherein the pattern of patterned reduced graphene (7) and metal form (1) Micro-structural it is consistent.

2. a kind of template thermal field induction manufacturing process of flexible reduced graphene patterned electrodes according to claim 1, It is characterized in that：Described metal form (1) is the metal with high thermal conductivity coefficient, including copper, stainless steel, nickel or chromium.

3. a kind of template thermal field induction manufacturing process of flexible reduced graphene patterned electrodes according to claim 1, It is characterized in that：The thickness of described graphene oxide film (4) is 0.1 micron to 100 microns.

4. a kind of template thermal field induction manufacturing process of flexible reduced graphene patterned electrodes according to claim 1, It is characterized in that：Described flexible substrate (5) is cellulose paper, cotton, polyimide film (PI films) or high temperature resistance polyester film PET film.