A cellulose-based voice input device, its preparation method and application

Abstract

This invention belongs to the field of cellulose-based composite materials technology, specifically relating to a cellulose-based voice input device and its preparation method and application. The preparation steps are as follows: Swelling-treated cellulose fibers are placed in a carbon nanotube dispersion system, stirred and reacted, followed by displacement washing, filtration, and drying to obtain a conductive cellulose fiber hand-made sheet; the first surface of the conductive cellulose fiber hand-made sheet is roughened to form conductive cellulose fiber short fibers; the first surfaces of two conductive cellulose fiber hand-made sheets are brought into contact, and wires are connected to the second surfaces of the two conductive cellulose fiber hand-made sheets respectively; then, the second surfaces of the two conductive cellulose fiber hand-made sheets are bonded to an elastic substrate to obtain the cellulose-based voice input device. In this device, the conductive cellulose fiber short fibers form a conductive path upon contact, and the elasticity and stiffness of the conductive cellulose fiber short fibers and the cellulose substrate allow for reversible changes in the contact area of ​​the conductive short fibers.

Description

Technical Field

[0001] This invention belongs to the field of cellulose-based composite materials technology, specifically relating to a cellulose-based voice input device and its preparation method and application. Background Technology

[0002] In recent years, smart wearable devices that can convert external mechanical stimuli into electrical signals have developed rapidly. In particular, smart wearable devices that can convert speech signals into electrical signals and achieve voice control have attracted widespread attention from researchers.

[0003] Controlling smart wearable devices via voice input is a research hotspot in the field of human-computer interaction, with enormous application potential. Currently, voice input devices mostly use metal conductors, conductive polymers, and semiconductors as substrates, which are characterized by high cost, high rigidity, and poor breathability, making long-term contact with the human body impossible. With continuous advancements in design and manufacturing processes, voice input devices have seen significant improvements in portability, response speed, recognition accuracy, and durability. However, these performance improvements primarily rely on sophisticated processing techniques (such as etching) and internal microstructures (such as diaphragms), which are difficult and costly to manufacture, hindering widespread adoption. Furthermore, metal conductors, conductive polymers, and semiconductors also face the challenges of being non-degradable and non-renewable, which is detrimental to environmental protection and sustainable development. Summary of the Invention

[0004] One of the objectives of this invention is to provide a method for preparing a cellulose-based voice input device, which is simple, easy to operate and practice.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for preparing a cellulose-based voice input device includes the following steps:

[0007] (1) The swollen cellulose fibers are placed in a carbon nanotube dispersion system and stirred to obtain carbon nanotube-grafted swollen cellulose fibers; the carbon nanotube-grafted swollen cellulose fibers are replaced, washed, filtered and dried to obtain conductive cellulose fiber hand-made sheets.

[0008] (2) The first surface of the conductive cellulose fiber hand-made sheet is roughened to form short fibers of conductive cellulose fiber on the first surface;

[0009] (3) Take two conductive cellulose fiber hand-made sheets that have been roughened, make the first surfaces of the two conductive cellulose fiber hand-made sheets contact each other, and connect wires to the second surfaces of the two conductive cellulose fiber hand-made sheets respectively. Then, attach the second surfaces of the conductive cellulose fiber hand-made sheets to the elastic substrate to obtain the cellulose-based voice input device.

[0010] Further, the conditions for the abrasive treatment in step (2) include: a machine speed of 5-20 m / min, a grinding roller speed of 800-1000 r / min, a grit size of 120-600 mesh for the abrasive roller sandpaper, a tension control range of 3-6 N for the cellulose fiber hand-made sheet, and a wrapping angle of 150-180 mm.

[0011] Further, the carbon nanotube dispersion system in step (1) is prepared by mixing carbon nanotubes with surfactant and water; the mass ratio of carbon nanotubes, surfactant and water is 1:(3-6):100.

[0012] Furthermore, the carbon nanotubes are single-walled carbon nanotubes or multi-walled carbon nanotubes, and the surfactant is hexadecyltrimethylamine bromide.

[0013] Furthermore, in step (1), the mass ratio of the carbon nanotube dispersion system to the swollen cellulose fiber is (5-8):1.

[0014] Further, the specific operation of the swelling treatment in step (1) is as follows: at -12℃, the cellulose fiber is placed in a mixed aqueous solution of NaOH and urea for 30-60s; wherein the mass ratio of NaOH, urea and water is 7:12:81, and the mass ratio of the mixed aqueous solution of NaOH and urea to the cellulose fiber is (10-20):1.

[0015] Furthermore, in step (1), the mass ratio of the carbon nanotube-grafted swollen cellulose fiber to water during the replacement washing process is 1:100.

[0016] Furthermore, the cellulose fibers after swelling treatment in step (1) need to be washed with water until pH=7 and dried until the moisture content is less than 1%.

[0017] Furthermore, the stirring time in step (1) is 5-20 min.

[0018] Furthermore, the wire in step (3) is a copper wire, and the elastic substrate is polydimethylsiloxane.

[0019] Furthermore, the cellulose fiber is any one of cotton pulp, wood pulp, hemp pulp, or straw pulp.

[0020] The second objective of this invention is to provide a cellulose-based voice input device, prepared using the aforementioned method. This cellulose-based voice input device uses cellulose as a base material and possesses advantages such as biodegradability, good breathability, high flexibility, and comfortable wear, making it a beneficial raw material for preparing environmentally friendly smart wearable devices.

[0021] To achieve the above objectives, the present invention adopts the following technical solution:

[0022] A cellulose-based voice input device is prepared using the above-described method for preparing a cellulose-based voice input device.

[0023] The third objective of this invention is to provide an application of a cellulose-based voice input device.

[0024] To achieve the above objectives, the present invention adopts the following technical solution:

[0025] The application of the aforementioned cellulose-based voice input device in the preparation of smart wearable devices.

[0026] Compared with the prior art, the beneficial effects of this invention are as follows:

[0027] (1) This invention provides a method for preparing a cellulose-based voice input device. First, the cellulose fiber substrate is swollen using a mixed aqueous solution of NaOH and urea, which preserves the crystal structure of natural cellulose fibers and improves the mechanical properties of the cellulose fiber hand-made sheet, such as burst strength and tear resistance. Then, a continuous carbon nanotube conductive layer is formed on the surface of the swollen cellulose through a grafting reaction. Next, a brushing process is performed to form uniform conductive cellulose fiber short fibers on the surface of the conductive cellulose fiber hand-made sheet. Finally, the two layers of conductive cellulose fiber short fibers are brought into contact to form a conductive path. The elasticity and stiffness of the conductive cellulose fiber short fibers and the cellulose substrate are utilized to achieve a reversible change in the contact area of ​​the conductive short fibers. This process is mature, easily integrated with existing technologies, and can be industrialized.

[0028] (2) The present invention provides a cellulose-based voice input device, which uses cellulose as a base material and has the advantages of being biodegradable, breathable, flexible and comfortable to wear. It is a beneficial raw material for preparing environmentally friendly smart wearable devices.

[0029] (3) The present invention provides the application of the above-mentioned cellulose-based voice input device in the preparation of smart wearable devices. By detecting the response signal of the cellulose-based voice input device during the pronunciation process, it is proved that the device has a response time of less than 300ms, can be used more than 500 times, and has a recognition accuracy of more than 85%. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the structure of the cellulose-based voice input device obtained by the present invention;

[0031] Figure 2 This is a schematic diagram illustrating the working principle of the cellulose-based voice input device obtained by the present invention;

[0032] Figure 3 These are structural diagrams of the cellulose substrates of Examples 1, 1, 2, and 3; wherein (A) is a structural diagram of the conductive cellulose fiber hand-made sheet of Example 1, (B) is a structural diagram of the cellulose substrate of Comparative Example 1, (C) is a structural diagram of the cellulose substrate of Comparative Example 2, and (D) is a structural diagram of the cellulose substrate of Comparative Example 3.

[0033] Figure 4 The diagram shows the conductivity of the cellulose-based voice input device and its wearing and use process; in the figure (A), the conductive path is constructed based on the cellulose-based voice input device, and in the figure (B), the tester uses the cellulose-based voice input device to collect voice signals.

[0034] Figure 5 It is the response signal of the cellulose-based speech input device prepared in Example 1 to the pronunciation of the word "China";

[0035] Figure 6 It is the response signal of the cellulose-based voice input device prepared in Example 2 to the pronunciation of the word "hello";

[0036] Figure 7 It is the response signal of the cellulose-based speech input device prepared in Example 3 to the pronunciation of the word "world";

[0037] Figure 8 It is the response signal of the cellulose-based voice input device prepared in Example 4 to the pronunciation of the word "thank you";

[0038] Explanation of reference numerals in the attached figures:

[0039] Wherein, 1 is the substrate polydimethylsiloxane; 2 is the conductive cellulose fiber hand-made sheet; 3 is the conductive cellulose fiber short fiber; 4 is pressure 1; 5 is pressure 2; and 6 is the contact point of the conductive cellulose fiber short fiber. Detailed Implementation

[0040] The technical solution of the present invention will be further explained below with reference to specific embodiments, comparative examples, experimental examples and accompanying drawings.

[0041] Unless otherwise specified, the raw materials and preparation methods used in the following examples, comparative examples, and experimental cases are all conventional materials and techniques in the art.

[0042] Example 1

[0043] A method for preparing a cellulose-based voice input device, the specific preparation process of which is as follows:

[0044] (1) Take 3.5g NaOH, 6g urea and 40.5g water to prepare a mixed aqueous solution of 50g NaOH and urea. After cooling to -12℃, add 5g cotton pulp to it and perform swelling treatment for 30s under mechanical stirring at 30r / min. Then immediately wash the swollen cotton pulp with distilled water until pH=7, and then dry it at 45℃ until the moisture content is less than 1% to obtain swollen cellulose fiber (4.5g).

[0045] A carbon nanotube dispersion system was prepared by uniformly mixing 0.3 g of hexadecyltrimethylamine bromide, 0.9 g of single-walled carbon nanotubes (1-2 nm in diameter and 4-30 μm in length) with 30 g of distilled water. 20 g of the carbon nanotube dispersion system was then used to immerse 4 g of the obtained swollen cellulose fibers in the system. The mixture was mechanically stirred at 30 r / min for 5 min, forming a continuous conductive carbon nanotube layer on the surface of the swollen cellulose fibers. The swollen cellulose fibers grafted with carbon nanotubes were then washed with 400 g of distilled water. The resulting filter cake was dried at 45 °C for 24 h to obtain a product with a basis weight of 250 g / m³. 2 Conductive cellulose fiber handmade sheet 2 (4.1g);

[0046] (2) The above-mentioned conductive cellulose fiber hand-made sheet 2 is treated by a sanding process. The machine speed is 5m / min, the grinding roller speed is 1000r / min, the sandpaper mesh is 120 mesh, the tension of the cellulose fiber hand-made sheet is 3N, the wrapping angle is 150mm, and the cellulose fibers on the surface of the hand-made sheet are cut to form a conductive cellulose fiber hand-made sheet 2 (3.5g) with uniform conductive cellulose fiber short fibers 3.

[0047] (3) Take two sets of conductive cellulose fiber hand-made sheets 2 with uniformly conductive cellulose fiber short fibers 3 obtained in step (2) and make the conductive cellulose fiber short fibers 3 in contact; then connect copper wires with a diameter of 1 mm to the other surface of the two sets of conductive cellulose fiber hand-made sheets respectively, and then attach two sets of polydimethylsiloxane 1 (PDMS) elastic substrates to the above surfaces respectively to obtain a cellulose-based voice input device, the structural schematic diagram of which is shown below. Figure 1 As shown.

[0048] Example 1 also provides a cellulose-based voice input device, which is prepared using the above-described preparation method.

[0049] The working principle of the cellulose-based voice input device of this invention is as follows:

[0050] The cellulose-based voice input device of this invention uses cellulose as a substrate. Conductive cellulose fiber hand-made sheets 2 are obtained through carbon nanotube surface grafting and vacuum filtration. Then, a polishing process is used to obtain uniform conductive cellulose fiber short fibers 3 on the surface of the hand-made sheets. When two layers of conductive cellulose fiber short fibers 3 are brought into contact, a conductive path is formed. The elasticity and stiffness of the conductive cellulose fiber short fibers 3 and the cellulose substrate are utilized to achieve reversible changes in the contact area of ​​the conductive short fibers. During vocalization, pressure changes caused by vocal cord vibration lead to changes in the contact area of ​​the conductive cellulose fiber short fibers 3, thus affecting the resistance of the cellulose-based voice input device. When the voltage is fixed, under pressure 1, the cellulose-based voice input device has fewer contact points 6 of conductive cellulose fiber short fibers, resulting in a higher resistance. When pressure 2 is applied to the cellulose-based voice input device, the number of contact points 6 of conductive cellulose fiber short fibers increases, leading to a decrease in the resistance of the cellulose-based voice input device. Finally, the cellulose-based voice input device obtains a current response signal related to the tester's voice signal (see schematic diagram of working principle as shown). Figure 2 (As shown).

[0051] Example 2

[0052] A method for preparing a cellulose-based voice input device, the specific preparation process of which is as follows:

[0053] (1) Take 7g NaOH, 12g urea and 81g water to prepare a mixed aqueous solution of 100g NaOH and urea. After cooling to -12℃, add 8g larch pulp and perform swelling treatment for 40s under mechanical stirring at 30r / min. Then immediately wash the swollen larch pulp with distilled water until pH=7. Then dry it at 45℃ until the moisture content is less than 1% to obtain swollen cellulose fiber (6.8g).

[0054] A carbon nanotube dispersion system was prepared by uniformly mixing 0.4 g of hexadecyltrimethylamine bromide, 1.6 g of single-walled carbon nanotubes (1-2 nm in diameter and 4-30 μm in length) with 40 g of distilled water. 36 g of the carbon nanotube dispersion system was then used to immerse 6 g of the obtained swollen cellulose fibers in the system. The mixture was mechanically stirred at 30 r / min for 10 min to form a continuous conductive carbon nanotube layer on the surface of the swollen cellulose fibers. The swollen cellulose fibers grafted with carbon nanotubes were then washed with 600 g of distilled water. The resulting filter cake was dried at 45 °C for 24 h to obtain a product with a basis weight of 300 g / m³. 2 Conductive cellulose fiber handmade sheet 2 (6.3g);

[0055] (2) The above-mentioned conductive cellulose fiber hand-made sheet was treated by a sanding process. The machine speed was 10m / min, the grinding roller speed was 900r / min, the sandpaper mesh was 180 mesh, the tension of the cellulose fiber hand-made sheet was 4N, the wrapping angle was 160mm, and the cellulose fibers on the surface of the hand-made sheet were cut to form a conductive cellulose fiber hand-made sheet 2 (5.7g) with uniform conductive cellulose fiber short fibers 3.

[0056] (3) Take two sets of conductive cellulose fiber hand-made sheets 2 with uniform conductive cellulose fiber short fibers 3 obtained in step (2) and make the conductive cellulose fiber short fibers 3 in contact; then connect copper wires with a diameter of 1 mm to the other surface of the two sets of conductive cellulose fiber hand-made sheets respectively, and then attach two sets of polydimethylsiloxane 1 (PDMS) elastic substrates to the above surfaces respectively to obtain a cellulose-based voice input device.

[0057] Example 2 also provides a cellulose-based voice input device, which is prepared using the above-described preparation method.

[0058] Example 3

[0059] A method for preparing a cellulose-based voice input device, the specific preparation process of which is as follows:

[0060] (1) Take 10.5g NaOH, 18g urea and 121.5g water to prepare a mixed aqueous solution of 150g NaOH and urea. After cooling to -12℃, add 10g hemp pulp and swell it for 50s under mechanical stirring at 30r / min. Then immediately wash the swollen hemp pulp with distilled water until pH=7. Then dry it at 45℃ until the moisture content is less than 1% to obtain swollen cellulose fiber (8.1g).

[0061] 0.6 g of hexadecyltrimethylamine bromide, 3 g of multi-walled carbon nanotubes (5-50 nm in diameter, 10-50 μm in length), and 60 g of distilled water were mixed evenly to prepare a 62.2 g carbon nanotube dispersion system. 56 g of the carbon nanotube dispersion system was taken, and 8 g of the obtained swollen cellulose fibers were immersed in it. The mixture was mechanically stirred at 30 r / min for 15 min to form a continuous conductive carbon nanotube layer on the surface of the swollen cellulose fibers. The carbon nanotube-grafted swollen cellulose fibers were then washed with 800 g of distilled water. The filter cake obtained after vacuum filtration was dried at 45 °C for 24 h to obtain a product with a basis weight of 400 g / m³. 2 Conductive cellulose fiber handmade sheet 2 (9.2g);

[0062] (2) The above-mentioned conductive cellulose fiber hand-made sheet 2 is treated by a grinding process. The machine speed is 15m / min, the grinding roller speed is 800r / min, the sandpaper mesh is 320 mesh, the tension of the cellulose fiber hand-made sheet is 5N, the wrapping angle is 170mm, and the cellulose fibers on the surface of the hand-made sheet are cut to form a conductive cellulose fiber hand-made sheet 2 (7.9g) with uniform conductive cellulose fiber short fibers 3.

[0063] (3) Take two sets of conductive cellulose fiber hand-made sheets 2 with uniform conductive cellulose fiber short fibers 3 obtained in step (2) and make the conductive cellulose fiber short fibers 3 in contact; then connect copper wires with a diameter of 1 mm to the other surface of the two sets of conductive cellulose fiber hand-made sheets respectively, and then attach two sets of polydimethylsiloxane 1 (PDMS) elastic substrates to the above surfaces respectively to obtain a cellulose-based voice input device.

[0064] Example 3 also provides a cellulose-based voice input device, which is prepared using the above-described preparation method.

[0065] Example 4

[0066] A method for preparing a cellulose-based voice input device, the specific preparation process of which is as follows:

[0067] (1) Take 14g NaOH, 24g urea and 162g water to prepare a mixed aqueous solution of 200g NaOH and urea. After cooling to -12℃, add 10g straw pulp and perform swelling treatment for 60s under mechanical stirring at 30r / min. Then immediately wash the swollen straw pulp with distilled water until pH=7, and then dry it at 45℃ until the moisture content is less than 1% to obtain swollen cellulose fiber (7.5g).

[0068] 0.7 g of hexadecyltrimethylamine bromide, 4.2 g of multi-walled carbon nanotubes (5-50 nm in diameter and 10-50 μm in length) and 70 g of distilled water were mixed evenly to prepare a 71.5 g carbon nanotube dispersion system. 57.6 g of the carbon nanotube dispersion system was taken, and 7.2 g of the obtained swollen cellulose fibers were immersed in it. The mixture was mechanically stirred at 30 r / min for 20 min to form a continuous conductive carbon nanotube layer on the surface of the swollen cellulose fibers. The carbon nanotube-grafted swollen cellulose fibers were then washed with 720 g of distilled water. The filter cake obtained after vacuum filtration was dried at 45 °C for 24 h to obtain a product with a basis weight of 500 g / m³. 2 Conductive cellulose fiber handmade sheet 2 (8.6g);

[0069] (2) The above-mentioned conductive cellulose fiber hand-made sheet 2 is treated by a grinding process. The machine speed is 20m / min, the grinding roller speed is 800r / min, the sandpaper mesh is 600 mesh, the tension of the cellulose fiber hand-made sheet is 6N, the wrapping angle is 180mm, and the cellulose fibers on the surface of the hand-made sheet are cut to form a conductive cellulose fiber hand-made sheet 2 (7.7g) with uniform conductive cellulose fiber short fibers 3.

[0070] (3) Take two sets of conductive cellulose fiber hand-made sheets 2 with uniform conductive cellulose fiber short fibers 3 obtained in step (2) and make the conductive cellulose fiber short fibers 3 in contact; then connect copper wires with a diameter of 1 mm to the other surface of the two sets of conductive cellulose fiber hand-made sheets respectively, and then attach two sets of polydimethylsiloxane 1 (PDMS) elastic substrates to the above surfaces respectively to obtain a cellulose-based voice input device.

[0071] Example 4 also provides a cellulose-based voice input device, which is prepared using the above-described preparation method.

[0072] To demonstrate the structure and conductivity of the conductive cellulose fiber hand-made sheet prepared by the present invention, comparative examples 1-3 were also conducted.

[0073] Comparative Example 1

[0074] Comparative Example 1 provides a cellulose substrate that has not undergone swelling treatment, carbon nanotube grafting, or sanding process.

[0075] Comparative Example 2

[0076] Comparative Example 2 provides a cellulose substrate that has undergone swelling treatment but has not been grafted with carbon nanotubes or subjected to a brushing process.

[0077] Comparative Example 3

[0078] Comparative Example 3 provides a cellulose substrate that has undergone swelling treatment and carbon nanotube grafting, but has not undergone a sanding process.

[0079] Experimental Example 1

[0080] The structures of the conductive cellulose fiber hand-coated sheet with a short-fiber structure prepared in Example 1 and the three cellulose substrates in Comparative Examples 1-3 were observed using an optical microscope, and the results are as follows: Figure 3 As shown, (A), (B), (C), and (D) correspond to the structural diagrams of the cellulose basis in Example 1 and Comparative Examples 1-3, respectively.

[0081] observe Figure 3(A) It is known that the surface of the conductive cellulose fiber hand-made sheet in Example 1 is grafted with uniform and continuous carbon nanotubes. After being treated with a polishing process, conductive cellulose fiber short fibers are formed on its surface, which can be used to prepare voice input devices. Figure 3 As can be seen in (B), the cellulose substrate of Comparative Example 1 has a smooth surface, has not undergone swelling treatment, has not undergone carbon nanotube grafting, and has not undergone a sanding process. Therefore, the cellulose substrate obtained in Comparative Example 1 is non-conductive. Figure 3 As can be seen in (C), the surface smoothness of the cellulose substrate in Comparative Example 2 decreased and the transparency increased after swelling treatment. It was not grafted with carbon nanotubes and was not subjected to a sanding process. Therefore, the cellulose substrate obtained in Comparative Example 2 is non-conductive. Figure 3 (D) After swelling treatment and carbon nanotube grafting, the surface smoothness of the cellulose substrate in Comparative Example 3 decreased and it was uniformly covered by carbon nanotubes. The cellulose substrate in Comparative Example 3 was conductive, but because it was not treated with a brushing process, the surface did not form a conductive cellulose fiber short fiber microstructure, so it could not be used to prepare a voice input device.

[0082] Experimental Example 2

[0083] The conductivity and wearing / use process of the cellulose-based voice input device prepared in Example 1 were analyzed, such as... Figure 4 As shown.

[0084] Depend on Figure 4 (A) It can be seen that the cellulose-based voice input device obtained in Example 1 has good conductivity. Figure 4 (B) It can be seen that the cellulose-based voice input device obtained in Example 1 has good wearability.

[0085] Experimental Example 3

[0086] The response signals of the cellulose-based voice input devices prepared in Examples 1-4 were detected, and the results are as follows: Figure 5-8 As shown.

[0087] Figure 5 The figure shows the response signal of the cellulose-based voice input device prepared in Example 1 to the pronunciation of the word "China". As can be seen from the figure, the response time of the cellulose-based voice input device prepared in Example 1 to the word "China" is 220ms, it can be used more than 500 times, and the recognition accuracy rate is 89%.

[0088] Figure 6 The figure shows the response signal of the cellulose-based voice input device obtained in Example 2 to the pronunciation of the word "hello". As can be seen from the figure, the response time of the cellulose-based voice input device obtained in Example 2 to the word "hello" is 280ms, it can be used more than 800 times, and the recognition accuracy rate is 85%.

[0089] Figure 7The figure shows the response signal of the cellulose-based speech input device prepared in Example 3 to the pronunciation of the word "world". As can be seen from the figure, the response time of the cellulose-based speech input device prepared in Example 3 to the word "world" is 160ms, it can be used more than 650 times, and the recognition accuracy rate is 93%.

[0090] Figure 8 The figure shows the response signal of the cellulose-based voice input device obtained in Example 4 to the pronunciation of the word "thank you". As can be seen from the figure, the response time of the cellulose-based voice input device obtained in Example 4 to the word "thank you" is 300ms, it can be used more than 600 times, and the recognition accuracy rate is 91%.

[0091] The above are merely preferred embodiments of the present invention and are not limited to the examples described above. Those skilled in the art will recognize that various modifications and variations can be made based on the principles of the present invention. Any modifications or improvements made should be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a cellulose-based voice input device, characterized by, The method comprises the following steps: (1) placing the cellulose fibers treated by swelling into a carbon nanotube dispersion system, and after stirring, obtaining carbon nanotube grafted swollen cellulose fibers; performing displacement washing, filtering, and drying on the carbon nanotube grafted swollen cellulose fibers, to obtain conductive cellulose fiber hand sheets; (2) performing sanding treatment on a first surface of the conductive cellulose fiber hand sheets, so that the first surface forms conductive cellulose fiber short fibers; (3) taking two pieces of conductive cellulose fiber hand sheets treated by sanding, contacting the first surfaces of the two pieces of conductive cellulose fiber hand sheets, connecting wires to the second surfaces of the two pieces of conductive cellulose fiber hand sheets respectively, and then bonding the second surfaces of the conductive cellulose fiber hand sheets to an elastic base material, to obtain the cellulose-based voice input device.

2. The method for preparing the cellulose-based voice input device according to claim 1, characterized in that, The sanding treatment in step (2) comprises the following conditions: a vehicle speed of 5-20 m / min, a sanding roller speed of 800-1000 r / min, a sanding roller sandpaper mesh range of 120-600 mesh, a cellulose fiber hand sheet tension control range of 3-6 N, and a covering angle of 150-180 mm.

3. The method for preparing the cellulose-based voice input device according to claim 1, characterized in that, The carbon nanotube dispersion system in step (1) is obtained by mixing carbon nanotubes, a surfactant, and water; and the mass ratio of the carbon nanotubes, the surfactant, and water is 1:(3-6):

100.

4. The method for preparing the cellulose-based voice input device according to claim 3, characterized in that, The carbon nanotubes are single-walled carbon nanotubes or multi-walled carbon nanotubes, and the surfactant is hexadecyltrimethylammonium bromide.

5. The method for preparing the cellulose-based voice input device according to claim 1, characterized in that, The mass ratio of the carbon nanotube dispersion system to the cellulose fibers treated by swelling in step (1) is (5-8):

1.

6. The method for preparing the cellulose-based voice input device according to claim 1, characterized in that, The swelling treatment in step (1) comprises the following specific operation: placing cellulose fibers in a mixed aqueous solution of NaOH and urea at-12℃ for 30-60 s; wherein the mass ratio of NaOH, urea, and water is 7:12:81, and the mass ratio of the mixed aqueous solution of NaOH and urea to the cellulose fibers is (10-20):

1.

7. The method for preparing the cellulose-based voice input device according to claim 1, characterized in that, The mass ratio of the carbon nanotube grafted swollen cellulose fibers to water during the displacement washing in step (1) is 1:

100.

8. The method of claim 1-7, wherein the cellulose-based voice input device is prepared by the steps of: The cellulose fibers treated by swelling in step (1) also need to be washed with water until the pH is 7 and dried until the moisture content is less than 1%.

9. A cellulose-based voice input device, characterized by The cellulose-based voice input device is prepared by using the preparation method in any one of claims 1-8.

10. Use of the cellulose-based voice input device in claim 9 in the preparation of a smart wearable device.

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