Transparent conductive wood and method of making the same

Abstract

The application discloses transparent conductive wood and a preparation method thereof, and the method comprises the following steps: bleaching wood pieces, and placing the bleached wood pieces in an ethanol solution for standby; preparing polymerizable deep eutectic solvent (PDES), and placing the prepared PDES at room temperature, then mixing and stirring the PDES with a crosslinking agent and a photoinitiator, and sealing the mixture for standby after completion of the stirring; pouring the mixture of the PDES, the crosslinking agent and the photoinitiator into the bleached wood pieces, and performing vacuum-air circulation, then sealing the impregnated uncured transparent wood pieces for standby; uniformly spraying silver nanowire / cellulose nanocrystal (AgNWs / CNC II) ethanol dispersion liquid on a glass plate, and after annealing and drying, stacking the impregnated uncured transparent wood pieces, curing the stacked transparent wood pieces, and then taking off the prepared transparent conductive wood with adjustable hardness and oxidation resistance from the glass plate. The application realizes the regulation and control of the hardness of the transparent conductive wood, and overcomes the problem that silver nanowires as a conductive layer are easy to be oxidized, resulting in the decrease of the conductive performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite functional materials, and particularly relates to a transparent conductive wood and a preparation method thereof. BACKGROUND

[0002] With the popularization of wearable devices, flexible displays, augmented reality (AR) and virtual reality (VR) technologies, the demand for optical display technology is increasing. Light management plays a key role in display technology, by adjusting parameters such as brightness, contrast, color and clarity of light, to improve display effect and user experience. In addition, light management in the use of solar energy and other renewable energy sources, by optimizing the optical performance in the process of solar energy absorption, conversion and storage, to improve the efficiency and stability of solar cells and photovoltaic systems, to promote the development of renewable energy technology.

[0003] In these fields, transparent conductive materials for photoelectric conversion are particularly critical, and currently plastic and glass are commonly used as substrates. On the one hand, glass is a relatively heavy material, which may increase the overall weight of the photovoltaic system, it is also relatively fragile and weak in impact resistance, and glass is not easy to recycle and reuse, which may have a certain negative impact on the environment. On the other hand, plastic materials do not have good weather resistance and may age, deform or discolor under long-term solar exposure or extreme temperature conditions, and plastic has poor scratch resistance. These shortcomings may limit the performance, cost-effectiveness and sustainability of photovoltaic systems. Therefore, finding new transparent conductive materials, especially sustainable, lightweight, weather-resistant and good conductive materials, is crucial for the development of photovoltaic technology.

[0004] To meet the needs of different photovoltaic devices, adjustable soft and hard, oxidation-resistant transparent conductive wood has important significance in light management applications. In optical devices and optical systems, light transmission and scattering are key issues. Conductive wood has transparency and can be used to control light transmission and scattering. By adjusting the structure and properties of wood, the direction of light propagation, scattering intensity and angle can be effectively controlled, and precise light management can be achieved. The adjustable soft and hard, oxidation-resistant transparent conductive wood can be used as a substrate or component of optical devices.

[0005] For example, the hard segment dominated transparent conductive wood can be used to manufacture optical lenses, optical waveguides, optical filters, etc. Due to the flexibility and adjustability, the conductive wood can realize more flexible device design and manufacturing, while reducing the cost and increasing the sustainability. In addition, in the field of solar energy, the soft segment dominated transparent conductive wood can be used to manufacture flexible solar cells, solar energy collectors and other devices. It not only can be used as the substrate of optical components, but also can be used as electrode material to provide charge transport and collection function. In addition, the transparency of the conductive wood can enhance the light absorption efficiency of the solar device. Moreover, the soft segment dominated transparent conductive wood can also be used to manufacture flexible optical display devices and optical sensors, as the substrate of display screen to realize high definition and flexible display.

[0006] The adjustable soft and hard antioxidant transparent conductive wood has wide application prospect and importance in light management applications. It not only can realize the adjustment of soft and hard structure, high optical performance and conductive performance, but also can be used to manufacture various optical devices and optical systems, and promote the development and innovation of optical technology.

[0007] The information disclosed in this part of the background is only intended to increase the understanding of the overall background of the present application, and should not be considered as acknowledging or implying in any form that the information constitutes prior art known to those skilled in the art. SUMMARY

[0008] The purpose of the present application is to provide a transparent conductive wood and a preparation method thereof, which uses acrylic acid as the soft segment and acrylamide as the hard segment, and can adjust the softness and hardness of the transparent conductive wood, overcoming the problem that silver nanowires as conductive layer are easy to oxidize, resulting in a decrease in conductive performance.

[0009] To achieve the above purpose, the present application adopts the following technical scheme:

[0010] A preparation method of a transparent conductive wood, comprising the following steps:

[0011] The wood chips are bleached, and the bleached wood chips are placed in an ethanol solution for standby;

[0012] A polymerizable deep eutectic solvent PDES is prepared, and the prepared PDES is placed at room temperature and then mixed and stirred with a crosslinking agent and a photoinitiator. After stirring, the mixture is sealed for standby;

[0013] The mixed liquid of PDES, crosslinking agent and photoinitiator is poured into the bleached wood chips, vacuum-air circulation is carried out, and the impregnated uncured transparent wood chips are sealed for standby;

[0014] The silver nanowire / cellulose nanocrystal AgNWs / CNC II ethanol dispersion liquid is uniformly sprayed on a glass plate, and after annealing and drying, the impregnated uncured transparent wood chips are stacked.

[0015] The transparent wood pieces are cured, and the prepared antioxidant transparent conductive wood with adjustable hardness and softness is peeled off from the glass plate after curing.

[0016] Optionally, the bleaching method of the wood pieces comprises:

[0017] When the density of the wood pieces is 0.1-0.4 g / cm³ and the thickness is 0.1-1 mm, the wood pieces are treated at 90°C for 2-4 h; when the thickness is 1-5 mm, the wood pieces are treated at 90°C for 4-6 h; when the thickness is 5-10 mm, the wood pieces are treated at 90°C for 6-8 h.

[0018] When the density of the wood pieces is 0.4-0.7 g / cm³ and the thickness is 0.1-1 mm, the wood pieces are treated at 90°C for 4-6 h; when the thickness is 1-5 mm, the wood pieces are treated at 90°C for 6-10 h; when the thickness is 5-10 mm, the wood pieces are treated at 90°C for 10-14 h.

[0019] When the density of the wood pieces is 0.7-1.0 g / cm³ and the thickness is 0.1-1 mm, the wood pieces are treated at 90°C for 5-8 h; when the thickness is 1-5 mm, the wood pieces are treated at 90°C for 8-12 h; when the thickness is 5-10 mm, the wood pieces are treated at 90°C for 12-16 h.

[0020] The width of the wood pieces is 5 cm.

[0021] Optionally, the wood pieces are bleached using a 1-2% sodium chlorite solution, and the pH value of the solution is 4.6, which is adjusted by acetic acid.

[0022] Optionally, the preparation method of the PDES comprises: adding choline chloride and acrylic acid, when the mass ratio of choline chloride to acrylic acid is 1 / 1-1 / 2, the acrylic acid acts as a hard segment to synthesize a hard segment-polymerizable deep eutectic solvent H-PDES; adding acrylamide as a soft segment to control the PDES to be a soft segment-polymerizable deep eutectic solvent S-PDES, and the mass ratio of choline chloride, acrylic acid and acrylamide is 1 / 1 / 1-1 / 2 / 1.

[0023] Optionally, the mixing mass ratio of the mixed liquid of the PDES, the crosslinking agent and the photoinitiator is 100:3.5:1, and the mixed liquid of the PDES, the crosslinking agent and the photoinitiator is poured into a beaker with a height of 10 times the height of the bleached wood pieces.

[0024] Optionally, the width of the glass plate is 5 cm x 5 cm, and the stacked transparent wood pieces are subjected to ultraviolet curing.

[0025] Optionally, the preparation method of the cellulose nanocrystals CNC II comprises:

[0026] Take 40 g of bleached wood pulp fiber into a vacuum oven, remove the moisture in the wood pulp fiber at 45℃ overnight;

[0027] Prepare a 400 g 20% mass fraction sodium hydroxide solution, add 40 g of dried wood pulp fiber at room temperature and stir, after 4 h of reaction, add a large amount of clean water to terminate the reaction, then repeat the washing until the pH value is neutral, after the excess water is filtered out, the alkali treated wood pulp fiber is placed in a vacuum oven and dried at 45℃ until the moisture is completely removed;

[0028] Prepare a 400 g 60% mass fraction sulfuric acid solution, cool to room temperature in a water bath and maintain the temperature at 45℃, slowly add the completely alkali treated and dried wood pulp fiber and stir for 1 h, finally add excess distilled water 5~10 times diluted to terminate the reaction, after settling, pour off the supernatant, repeat several times until the pH value is neutral;

[0029] Transfer the neutral white precipitate after settling to a dialysis bag and dialyze for 3~4 days with a molecular weight cutoff of 12KD~14KD, pass the pure suspension after dialysis through a high-pressure homogenizer to obtain a stable and uniform light blue CNC II suspension, and measure and calculate its solid content;

[0030] Freeze-dry the prepared CNC II and seal for later use.

[0031] Alternatively, the sulfuric acid solution is cooled to room temperature by a crystallizing dish ice water bath, and then maintained at 45℃ by a water bath.

[0032] Alternatively, the silver nanowire / cellulose nanocrystal AgNWs / CNC II ethanol dispersion liquid has a concentration of 1 mg / mL, and the preparation method is as follows: take 0.5 mL of 10 mg / mL silver nanowire ethanol dispersion liquid, add 5 mg of freeze-dried CNC II, and then add 9.5 mL of ethanol, and ultrasonic for 2 min at 80% power.

[0033] Alternatively, a transparent conductive wood includes a transparent wood layer and an AgNWs / CNC II layer.

[0034] Compared with the prior art, the application has the following beneficial effects:

[0035] The transparent conductive layer prepared from silver nanowires and cellulose nanocrystals and the transparent wood prepared from polymeric deep eutectic solvent can form an oxidation-resistant layer and a soft and hard adjustable transparent substrate in the transparent wood, and can enhance the interface bonding between the conductive layer and the transparent wood, overcoming the problem that silver nanowires as a conductive layer are easily oxidized, resulting in a decrease in conductive performance.

[0036] By adjusting the ratio and structure of the added bifunctional monomers acrylic acid, acrylamide and polymerized deep eutectic solvent, the hardness of the transparent conductive wood is precisely controlled to meet the needs of different occasions, such as flexible materials and rigid materials. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0038] Figure 1 The preparation method flowchart provided by the present application;

[0039] Figure 2 The influence statistical chart of different spraying layers of AgNWs / CNC II on the sheet resistance of the transparent conductive wood provided by the present application;

[0040] Figure 3 The influence statistical table of different spraying layers of AgNWs / CNC II on the transmittance (550nm transmittance in the figure) of the transparent conductive wood provided by the present application;

[0041] Figure 4 The structure diagram of the transparent conductive wood provided by the present application.

[0042] Explanation of reference signs:

[0043] 1, AgNWs / CNC II layer; 2, transparent wood layer. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. The description of the at least one exemplary embodiment is actually only illustrative, and is by no means any limitation on the present application and its application or use. EMBODIMENT

[0045] As shown in Figure 1

[0046] I. The wood chips are bleached, and the bleached wood chips are placed in an ethanol solution for standby;

[0047] The wood chips are bleached using 1-2% sodium chlorite solution, and the solution pH is 4.6;

[0048] ​The bleaching method of wood chips comprises:

[0049] The wood chip density is 0.1-0.4 g / cm³, the thickness is 0.1-1 mm, and the treatment is carried out at 90°C for 2-4 h; the thickness is 1-5 mm, and the treatment is carried out at 90°C for 4-6 h; the thickness is 5-10 mm, and the treatment is carried out at 90°C for 6-8 h;

[0050] The wood chip density is 0.4-0.7 g / cm³, the thickness is 0.1-1 mm, and the treatment is carried out at 90°C for 4-6 h; the thickness is 1-5 mm, and the treatment is carried out at 90°C for 6-10 h; the thickness is 5-10 mm, and the treatment is carried out at 90°C for 10-14 h;

[0051] The wood chip density is 0.7-1.0 g / cm³, the thickness is 0.1-1 mm, and the treatment is carried out at 90°C for 5-8 h; the thickness is 1-5 mm, and the treatment is carried out at 90°C for 8-12 h; the thickness is 5-10 mm, and the treatment is carried out at 90°C for 12-16 h.

[0052] The wood chips of different thicknesses are bleached for different times to ensure complete bleaching of the wood chips.

[0053] In this embodiment, the balsa wood 0.1 g / cm³, the thickness is 0.2 mm, the width of the wood chip is 5 cm x 5 cm, 1% sodium chlorite is used, the acetic acid is used to adjust the ph to 4.6, the treatment is carried out at 90°C for 2 h, and then the wood chip is placed in distilled water for 1 day, and then the ethanol is replaced (one day one replacement, 3 days), and finally the wood chip is stored in the ethanol solution.

[0054] II. Preparation of polymerizable deep eutectic solvent PDES, the prepared PDES is placed at room temperature, and then mixed and stirred with a crosslinking agent and a photoinitiator, and then sealed for use after stirring is completed;

[0055] The crosslinking agent used in this embodiment is PEGDA, and the photoinitiator is photoinitiator 2959.

[0056] The preparation method of the PDES is: adding choline chloride and acrylic acid, when the mass ratio of choline chloride to acrylic acid is 1 / 1-1 / 2, the acrylic acid acts as a hard segment, and a hard segment-polymerizable deep eutectic solvent H-PDES is synthesized; adding acrylamide as a soft segment to control the PDES to be a soft segment-polymerizable deep eutectic solvent S-PDES, the mass ratio of choline chloride, acrylic acid and acrylamide is 1 / 1 / 1-1 / 2 / 1, by adjusting the ratio and structure of the added bifunctional monomers acrylic acid, acrylamide and polymer deep eutectic solvent, the hardness of the transparent conductive wood is accurately controlled to meet the needs of different occasions, such as flexible materials and rigid materials;

[0057] In this embodiment, the mass ratio of choline chloride / acrylic acid / acrylamide is 1 / 2 / 1, and the stirring is carried out at 90°C for 2 h.

[0058] III. Put the bleached wood chips into a beaker, pour the mixed liquid of PDES, crosslinking agent and photoinitiator, put it into a vacuum oven for vacuum-air cycle, seal the impregnated uncured transparent wood chips for standby;

[0059] The mixed mass ratio of PDES, crosslinking agent and photoinitiator is 100:3.5:1, and the mixed liquid of PDES, crosslinking agent and photoinitiator 2959 is poured into a beaker with a height of 10 times that of the bleached wood chips.

[0060] The transparent wood polymer PDES has hydrophilicity and can form good interfacial bonding with cellulose nanocrystals.

[0061] IV. Uniformly spray the silver nanowire / cellulose nanocrystal AgNWs / CNC II ethanol dispersion on the glass plate, and after annealing and drying, stack the impregnated uncured transparent wood chips;

[0062] The annealing and drying temperature in this embodiment is 100℃.

[0063] The preparation method of cellulose nanocrystals CNC II is as follows:

[0064] Take 40 g of bleached wood pulp fiber and put it into a clean beaker, and place it in a vacuum oven at 45℃ for one night to remove the water in the wood pulp fiber;

[0065] Prepare 400 g of 20% mass fraction sodium hydroxide solution, add 40 g of dried wood pulp fiber at room temperature and stir, after 4 h of reaction, add a large amount of clean water to terminate the reaction, then repeat the washing until the pH value is neutral, remove the excess water by filtration, and then place the alkali-treated wood pulp fiber in a vacuum oven at 45℃ for drying until the water is completely removed;

[0066] Prepare 400 g of 60% mass fraction sulfuric acid solution, cool the crystallizing dish in ice water bath to room temperature, then maintain the temperature at 45℃ by oil bath, slowly add the alkali-treated and completely dried wood pulp fiber and stir for 1 h, finally add excess distilled water 5~10 times to dilute to terminate the reaction, pour off the supernatant after settling, repeat several times until the pH value is neutral;

[0067] Transfer the neutralized white precipitate after settling to a dialysis bag and dialyze for 3~4 days, with a molecular weight cutoff of 12KD~14KD, and then obtain a stable and uniform light blue CNC II suspension by treating the pure suspension after dialysis with a high-pressure homogenizer, and measure and calculate its solid content;

[0068] Freeze-dry the prepared CNC II and seal it for standby.

[0069] The concentration of the AgNWs / CNC II ethanol dispersion liquid is 1 mg / mL, and the preparation method is as follows: 0.5 mL of 10 mg / mL silver nanowire ethanol dispersion liquid is taken, 5 mg of freeze-dried CNC II is added, then 9.5 mL of ethanol is added, and ultrasonic is performed at 80% power for 2 min.

[0070] The addition of cellulose nanocrystals in silver nanowires can form an oxidation-resistant layer on the silver nanowire layer, maintaining the long-term high conductivity of silver nanowires.

[0071] The spray method semi-embedded silver nanowires / cellulose nanocrystals semi-embedded transparent wood, first, the entire conductive layer plays a protective role, and second, enhances the interface bonding of the conductive layer and the transparent wood.

[0072] Five, the stacked transparent wood pieces are cured, and the prepared oxidation-resistant transparent conductive wood with adjustable softness and hardness is removed from the glass plate after curing.

[0073] The finished product conductive wood produced in this embodiment is a softwood board that can be bent at 90°. Embodiment

[0074] The glass plate has a width of 5 cm x 5 cm, and the stacked transparent wood pieces are ultraviolet cured.

[0075] The oxidation-resistant transparent conductive wood with adjustable softness and hardness in this embodiment is cured in an ultraviolet curing box, and is placed in a well-ventilated area for at least one day after curing to avoid the generation of toxic compound gases during the ultraviolet curing process, which can harm the operator. Embodiment

[0076] A transparent conductive wood, as shown in Figure 4 , includes a transparent wood layer 2 and an AgNWs / CNC II layer 1, and can be applied in the fields of optical devices, flexible electronics, building materials, lighting equipment, and automobiles.

[0077] As shown in Figure 2 , according to experimental data, the addition of the AgNWs / CNC II layer reduces the square resistance and improves the conductivity of the entire conductive wood.

[0078] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used only to explain the relative position relationship, movement condition and the like between the components in a certain specific posture, and if the specific posture changes, the directional indication also changes accordingly. It is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0079] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood through specific circumstances.

[0080] The above is only the preferred embodiment of the application, it should be pointed out that for those skilled in the art, without departing from the technical principles of the application, a number of improvements and modifications can be made, these improvements and modifications should be considered as the protection scope of the application.

Claims

1. A method for producing transparent conductive wood, characterized by: It comprises the following steps: bleaching the wood chips, and placing the bleached wood chips in an ethanol solution for standby; preparing a polymerizable deep eutectic solvent (PDES), and mixing and stirring the prepared PDES with a crosslinking agent and a photoinitiator after being placed at room temperature, and sealing for standby after completion of the stirring; the preparation method of the PDES is: adding choline chloride and acrylic acid, when the mass ratio of choline chloride to acrylic acid is 1 / 1-1 / 2, the acrylic acid acts as a hard segment, and a hard segment-polymerizable deep eutectic solvent H-PDES is synthesized; adding acrylamide as a soft segment to regulate the PDES to be a soft segment-polymerizable deep eutectic solvent S-PDES, and the mass ratio of choline chloride, acrylic acid and acrylamide is 1 / 1 / 1-1 / 2 / 1; pouring the mixed liquid of the PDES, the crosslinking agent and the photoinitiator into the bleached wood chips, and performing vacuum-air circulation, and sealing the impregnated uncured transparent wood chips for standby; uniformly spraying the silver nanowire / cellulose nanocrystal AgNWs / CNC II ethanol dispersion liquid on a glass plate, and after annealing and drying, stacking the impregnated uncured transparent wood chips; the preparation method of the cellulose nanocrystal CNC II is: taking the bleached wood pulp fibers and placing them in a vacuum oven at 45℃ for one night to remove the water in the wood pulp fibers; preparing a 20% mass fraction sodium hydroxide solution, adding 1 / 10 mass fraction sodium hydroxide solution to the dried wood pulp fibers at room temperature and stirring, adding a large amount of clean water to terminate the reaction after the reaction, and then repeatedly washing until the pH value is neutral, removing the excess water by filtration, and placing the alkali-treated wood pulp fibers in a vacuum state and drying at 45℃ until the water is completely removed; configuring a 60% mass fraction sulfuric acid solution with the same amount of sodium hydroxide solution, cooling to room temperature in a water bath and maintaining the temperature at 45℃, slowly adding the alkali-treated and completely dried wood pulp fibers and stirring, and finally adding an excess of distilled water 5-10 times to dilute to terminate the reaction, pouring away the supernatant after sedimentation, and repeating multiple times until the pH value is neutral; transferring the neutralized cream-white precipitate after sedimentation to a dialysis bag for dialysis for 3-4 days, with a molecular weight cutoff of 12KD-14KD, and obtaining a stable and uniform light blue CNC II suspension by treating the pure suspension after dialysis with a high-pressure homogenizer, and measuring and calculating the solid content; freezing and drying the prepared CNC II for standby; curing the stacked transparent wood chips, and removing the prepared transparent conductive wood with adjustable hardness and oxidation resistance from the glass plate after curing.

2. The transparent conductive wood production method according to claim 1, characterized by, The bleaching method of the wood chips comprises: when the density of the wood chips is 0.1-0.4 g / cm³ and the thickness is 0.1-1 mm, treating at 90℃ for 2-4 h; when the thickness is 1-5 mm, treating at 90℃ for 4-6 h; and when the thickness is 5-10 mm, treating at 90℃ for 6-8 h; when the density of the wood chips is 0.4-0.7 g / cm³ and the thickness is 0.1-1 mm, treating at 90℃ for 4-6 h; when the thickness is 1-5 mm, treating at 90℃ for 6-10 h; and when the thickness is 5-10 mm, treating at 90℃ for 10-14 h; The wood chip density is 0.7-1.0 g / cm³, the thickness is 0.1~1mm, and the treatment is carried out at 90℃ for 5~8h; the thickness is 1~5mm, and the treatment is carried out at 90℃ for 8~12h; the thickness is 5~10mm, and the treatment is carried out at 90℃ for 12~16h.

3. The transparent conductive wood production method according to claim 1, characterized by, The wood chip is bleached using 1~2% sodium chlorite solution, and the solution pH is 4.6~5.

5.

4. The transparent conductive wood production method according to claim 1, characterized by, The mixing mass ratio of the mixed liquid of the PDES, the crosslinking agent and the photoinitiator is 100:3.5:1, and the mixed liquid of the PDES, the crosslinking agent and the photoinitiator is poured into a beaker with a height of 10 times that of the bleached wood chip.

5. The transparent conductive wood production method according to claim 1, wherein The transparent wood chip after the stacking is completed is subjected to ultraviolet curing.

6. The transparent conductive wood production method according to claim 1, wherein The sulfuric acid solution is cooled to room temperature through a crystallizing dish ice water bath and is maintained at 45℃ through an oil bath.

7. The transparent conductive wood production method according to claim 1, wherein The silver nanowire / cellulose nanocrystal AgNWs / CNC II ethanol dispersion liquid concentration is 1mg / mL, and the configuration method is as follows: 0.5mL of 10mg / mL silver nanowire ethanol dispersion liquid is taken, 5mg of freeze-dried CNC II is added, then 9.5mL of ethanol is added, and ultrasonic is carried out at 80% power for 2min.

8. The transparent conductive wood prepared according to the method of any one of claims 1-7, wherein, It comprises a transparent wood layer and an AgNWs / CNC II layer.

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