Nanowire manufacturing jig, nanowire transfer body, nanowire manufacturing device, and nanowire manufacturing method

Abstract

To reduce manufacturing cost of a nanowire.SOLUTION: A nanowire manufacturing jig that is used in manufacture of a nanowire includes: a film base material capable of being wound in a roll direction; a plurality of projection parts which are provided so as to project from the film base material, extend in a width direction perpendicular to the roll direction, and are provided at predetermined intervals in the roll direction; and a conductive film pattern which is provided on the film base material and the plurality of projection parts, and forms a nanofiber as the core material of the nanowire between the adjacent projection parts.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a nanowire manufacturing tool, a nanowire transfer body, a nanowire manufacturing apparatus, and a nanowire manufacturing method. [Background technology]

[0002] A conventional method for producing nanowires involves forming a nanofiber nanoparticle composite by electrospinning in an electrospinning synthesis solution containing nanoparticles, drying the resulting composite, and then growing nanowires from the nanoparticles using a hydrothermal synthesis method on the dried nanofiber nanoparticle composite (see, for example, Patent Document 1). In this method, the electrospinning synthesis solution is sprayed toward a collector via a syringe pump to form a nanofiber nanoparticle composite. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2019-505700 Summary of the Invention [Problem to be solved by the invention]

[0004] The collectors used in producing nanowires generally have a small area, which makes it difficult to produce nanowires efficiently, and this is a factor that hinders the reduction of the cost of nanowires.

[0005] Therefore, an object of the present disclosure is to provide a nanowire production jig, a nanowire transfer body, a nanowire production apparatus, and a nanowire production method that can reduce the cost of producing nanowires. [Means for solving the problem]

[0006] The nanowire production jig of the present disclosure is a nanowire production jig used for producing nanowires, and comprises a film substrate that can be rolled in a roll direction, a plurality of protrusions that protrude from the film substrate, extend in a width direction perpendicular to the roll direction, and are arranged at predetermined intervals in the roll direction, and a conductive film pattern that is provided on the film substrate and the plurality of protrusions, and that forms nanofibers that serve as core materials for the nanowires between adjacent protrusions.

[0007] The nanowire transfer body of the present disclosure is a nanowire transfer body onto which the nanowires manufactured using the above-mentioned nanowire production jig have been transferred, and the film substrate of the nanowire production jig is pulled in the roll direction, pulling the mountain-folded protrusions so that they are flush with the film substrate, and the nanowires formed between adjacent protrusions are transferred to the film substrate.

[0008] Another nanowire transfer material disclosed herein is a nanowire transfer material onto which nanowires manufactured using the above-mentioned nanowire manufacturing tool have been transferred, and by peeling it off from the film substrate, the transfer material contains the transferred nanowires.

[0009] The nanowire manufacturing apparatus of the present disclosure is a nanowire manufacturing apparatus that uses the above-mentioned nanowire manufacturing jig to manufacture the nanowire, wherein the nanowire manufacturing jig is wound in the roll direction, and includes a supply unit that supplies the wound nanowire manufacturing jig in the roll direction, a fiber forming unit that forms nanofibers that will serve as the core material of the nanowires on the supplied nanowire manufacturing jig, a thin film forming unit that forms a metal thin film on the nanofibers to form the nanowires, and a recovery unit that winds the nanowire manufacturing jig in the roll direction and recovers it after the nanowires have been manufactured.

[0010] The nanowire production method of the present disclosure is a nanowire production method that uses the above-mentioned nanowire production jig to produce the nanowire, wherein the nanowire production jig is wound in the rolling direction, and includes the steps of: supplying the wound nanowire production jig in the rolling direction; forming a nanofiber that will serve as the core material of the nanowire on the supplied nanowire production jig; forming a metal thin film on the nanofiber to form the nanowire; and winding the nanowire production jig in the rolling direction and recovering it after the nanowire has been produced. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to reduce the manufacturing costs of nanowires. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a nanowire manufacturing apparatus according to the first embodiment. [Figure 2] FIG. 2 is a perspective view schematically showing the nanowire manufacturing jig according to the first embodiment. [Figure 3] FIG. 3 is an explanatory diagram of the nanowire transferred body according to the first embodiment. [Figure 4] FIG. 4 is a flowchart illustrating an example of the nanowire manufacturing method according to the first embodiment. [Figure 5] FIG. 5 is a schematic diagram showing the configuration of a nanowire manufacturing apparatus according to the second embodiment. [Figure 6] FIG. 6 is an explanatory diagram of a nanowire transferred body according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical. Furthermore, the components described below can be combined as appropriate, and if there are multiple embodiments, the respective embodiments can also be combined.

[0014] [Embodiment 1] The nanowire manufacturing jig 10 according to the first embodiment is used in a nanowire manufacturing apparatus 1 and a nanowire manufacturing method for manufacturing nanowires, and the manufactured nanowires NW are commercialized and provided as nanowire transfer bodies 20.

[0015] FIG. 1 is a schematic diagram showing the configuration of a nanowire manufacturing apparatus according to embodiment 1. FIG. 2 is a perspective view schematically showing a nanowire manufacturing jig according to embodiment 1. FIG. 3 is an explanatory diagram of a nanowire transfer body according to embodiment 1. FIG. 4 is a flowchart of an example of a nanowire manufacturing method according to embodiment 1. First, the nanowire manufacturing apparatus 1 will be described with reference to FIGS. 1 and 2.

[0016] (Nanowire manufacturing equipment) The nanowire production apparatus 1 is an apparatus for producing nanowires NW by a roll-to-roll method using a nanowire production jig 10. As shown in FIG. 2, the nanowires NW are formed by forming a metal thin film MF on a nanofiber NF as a core material. The nanowire production apparatus 1 includes a supply unit 4, a fiber forming unit 5, a thin film forming unit 6, and a collection unit 7. The nanowire production jig 10 used in the nanowire production apparatus 1 is a roll wound in the roll direction, and the rolled nanowire production jig 10 is set in the supply unit 4.

[0017] The supply unit 4 unwinds the roll of nanowire production jig 10 in the roll direction, thereby supplying it toward the collection unit 7. The supply unit 4 holds the roll axis of nanowire production jig 10 and rotates around the roll axis, thereby unwinding nanowire production jig 10 in the roll direction.

[0018] The fiber forming unit 5 uses electrospinning (electrospinning) to form a nanofiber NW, which will serve as a core material, on the nanowire manufacturing jig 10. The fiber forming unit 5 is provided opposite the nanowire manufacturing jig 10 that is unwound in the rolling direction. The fiber forming unit 5 causes the nanowire manufacturing jig 10 to function as a collector. The nanofiber NW is formed on the nanowire manufacturing jig 10 so that its fiber direction is aligned with the rolling direction.

[0019] The thin film forming unit 6 forms a thin metal film MF by sputtering, vapor deposition, or the like on the nanofiber NW formed on the nanowire manufacturing jig 10 to form the nanowire NW. The thin film forming unit 6 is provided opposite the nanowire manufacturing jig 10 unwound in the rolling direction, and is provided downstream of the fiber forming unit 5 in the rolling direction.

[0020] The recovery unit 7 recovers the nanowire production jig 10 after the nanowires NW have been produced by winding it in the roll direction. In the first embodiment, the recovery unit 7 recovers the nanowire production jig 10 together with the produced nanowires NW. The recovery unit 7 rotates around a roll axis that holds the recovered nanowire production jig 10, thereby winding up the nanowire production jig 10 in the roll direction to form a roll body.

[0021] In the nanowire manufacturing apparatus 1 described above, when the nanowire manufacturing jig 10 is fed from the supply unit 4, the fiber forming unit 5 forms nanofibers NF on the fed nanowire manufacturing jig 10 by electrospinning. Thereafter, in the nanowire manufacturing apparatus 1, the thin film forming unit 6 forms a thin metal film MF on the nanofibers NF formed in the nanowire manufacturing jig 10, thereby manufacturing nanowires NW. Then, in the nanowire manufacturing apparatus 1, the recovery unit 7 winds up the nanowire manufacturing jig 10 together with the manufactured nanowires NW.

[0022] (Nanowire manufacturing jig) Next, the nanowire production jig 10 will be described with reference to Fig. 2. The nanowire production jig 10 includes a film substrate 11, a plurality of protrusions 12, and a conductive film pattern 13.

[0023] Film substrate 11 is made of a flexible material that can be rolled in the roll direction, and is, for example, a transparent film made of a resin such as PET. Film substrate 11 also functions as a transfer film that transfers the nanowires NW manufactured on nanowire manufacturing jig 10. In other words, film substrate 11 is a film that can hold the nanowires NW by contacting it. Film substrate 11 has a length L1 in the width direction of, for example, about 250 mm.

[0024] The protrusions 12 protrude from the film substrate 11 and are formed by folding a portion of the film substrate 11 in a mountain-like manner. The protrusions 12 extend in the width direction perpendicular to the rolling direction. The protrusions 12 are arranged at a predetermined interval from the width-direction end of the film substrate 11 in the width direction. A plurality of the protrusions 12 are arranged in the rolling direction at a predetermined interval. The cross section of the protrusions 12 cut at a plane perpendicular to the width direction has a mountain-like shape with an apex. The height of the protrusions 12 from the film substrate 11 is, for example, about 1 mm, which is the minimum height required for forming the nanofibers NF. The distance L2 between adjacent protrusions 12 in the rolling direction is, for example, about 20 mm.

[0025] The conductive film pattern 13 is provided to allow the nanowire manufacturing jig 10 to function as a collector, i.e., to form nanofibers NF between the protrusions 12 adjacent in the rolling direction. The conductive film pattern 13 includes a first pattern 13a provided on the film substrate 11 and a second pattern 13b provided on the protrusions 12. A pair of the first patterns 13a are provided on both sides of the film substrate 11 in the width direction, and are provided across the rolling direction. The second patterns 13b are provided on the tops of the protrusions 12, and are provided across the width direction. Both sides of the second patterns 13b in the width direction are connected to the pair of first patterns 13a.

[0026] The nanowire manufacturing jig 10 as described above has valley fold lines 15 and multiple incisions 16 formed on both sides in the width direction. A pair of valley fold lines 15 is provided on both sides in the width direction of the film substrate 11, and is provided across the rolling direction. The valley fold lines 15 are formed with a predetermined gap from both ends in the width direction. Note that the length L3 from the end of the film substrate 11 to the valley fold lines 15 in the width direction is, for example, approximately 5 mm. The multiple incisions 16 are provided at the same positions as the multiple protrusions 12 in the rolling direction. The incisions 16 are formed in the width direction from the end of the film substrate 11 to the protrusions 12.

[0027] The film substrate 11 is valley-folded along the valley fold lines 15 between the incisions 16 adjacent in the rolling direction, thereby increasing its rigidity in the rolling direction. As a result, the valley-folded portions maintain the spacing between the protrusions 12 adjacent in the rolling direction. When the formed nanowires NW are transferred to the film substrate 11, the valley folds of the film substrate 11 are returned to their original state.

[0028] (Nanowire transfer body) Next, the operation of manufacturing the nanowire transfer body 20 will be described with reference to Fig. 3. In the first embodiment, the nanowire NW manufactured on the nanowire manufacturing jig 10 is transferred onto the film substrate 11 to manufacture the nanowire transfer body 20. Fig. 3 is a diagram of the nanowire manufacturing jig 10 cut along a plane perpendicular to the width direction.

[0029] First, as shown in Fig. 3, nanowires NW are formed in nanowire production jig 10 so as to bridge between protrusions 12 adjacent in the rolling direction (step S11). When nanowire production jig 10 is pulled from the state in step S11, protrusions 12 that are folded in a mountain shape are stretched (step S12). When nanowire production jig 10 is further pulled from step S12, protrusions 12 become approximately flush with film substrate 11, and nanowires NW come into contact with film substrate 11 (step S13). In step S13, nanowires NW in contact with film substrate 11 are held by film substrate 11, resulting in nanowire transferred body 20 in which nanowires NW are transferred to film substrate 11.

[0030] (Nanowire manufacturing method) Next, with reference to FIG. 4, an example of a method for producing nanowires NW using the nanowire production apparatus 1 will be described.

[0031] In the nanowire production method, nanowires NW are produced using the nanowire production jig 10. The nanowire production jig 10 is in the form of a roll and is set in the supply unit 4, with the tip of the nanowire production jig 10 unwound from the supply unit 4 being set in the recovery unit 7. In this state, in the nanowire production method, first, the nanowire production jig 10 is unwound from the supply unit 4 in the roll direction to supply the wound nanowire production jig 10 (step S1). Next, in the nanowire production method, nanofibers NF are formed on the supplied nanowire production jig 10 by the fiber forming unit 5 (step S2). Thereafter, in the nanowire production method, a metal thin film MF is formed on the nanofibers NF formed in the nanowire production jig 10 by the thin film forming unit 6, thereby producing nanowires NW (step S3). Then, in the nanowire production method, the nanowire production jig 10 is pulled to transfer the produced nanowires NW to the film substrate 11, and the nanowire production jig 10 becomes the nanowire transfer body 20 (step S4). Thereafter, in the nanowire production method, the nanowire production jig 10 after the nanowires NW have been produced, i.e., the nanowire transfer body 20, is wound up in the roll direction by the recovery unit 7 and recovered (step S5). In the nanowire production method, the nanowires NW are continuously produced until the supply of the nanowire production jig 10 is stopped, and the series of processes ends when the supply of the nanowire production jig 10 is stopped.

[0032] [Embodiment 2] Next, a second embodiment will be described with reference to Figures 5 and 6. In the second embodiment, only the parts different from the first embodiment will be described to avoid repetition, and parts having the same configuration as the first embodiment will be described using the same reference numerals. Figure 5 is a schematic diagram showing the configuration of a nanowire production apparatus according to the second embodiment. Figure 6 is an explanatory diagram of a nanowire transfer body according to the second embodiment.

[0033] In embodiment 1, the manufactured nanowire NW is transferred to the film substrate 11 of the nanowire production jig 10 to form the nanowire transfer body 20, whereas in embodiment 2, the manufactured nanowire NW is transferred to the transfer material 35 of the nanowire production jig 10 to form the nanowire transfer body 40.

[0034] (Nanowire manufacturing equipment) The nanowire manufacturing apparatus 31 of the second embodiment further includes a transfer unit 33 in addition to the nanowire manufacturing tool 10 of the first embodiment.

[0035] The transfer unit 33 has multiple transfer rolls 34, and supplies the transfer material 35 in the direction of the rolls, with the transfer material 35 facing the nanowire production jig 10. The transfer unit 33 is located downstream of the thin film forming unit 6 in the direction of the rolls. The transfer unit 33 supplies the transfer material 35 at approximately the same supply speed as the nanowire production jig 10.

[0036] (Nanowire manufacturing jig) Nanowire production jig 10 of embodiment 2 further includes transfer material 35 in addition to nanowire production jig 10 of embodiment 1. Transfer material 35 is a transfer film onto which nanowires NW produced on nanowire production jig 10 are transferred. Note that the transfer material is not limited to a transfer film and may be a flat plate-shaped material, and any material may be used as long as it is capable of transferring nanowires NW. Furthermore, in the case of embodiment 2, protrusions 12 of nanowire production jig 10 do not need to be formed by mountain folding, as shown in FIG. 6, and may be formed separately on film substrate 11, for example.

[0037] (Nanowire transfer body) Next, the operation of manufacturing the nanowire transfer body 20 will be described with reference to Fig. 6. In the second embodiment, the nanowire NW manufactured on the nanowire manufacturing jig 10 is transferred to a transfer material 35 to manufacture the nanowire transfer body 40. Fig. 6 is a diagram of the nanowire manufacturing jig 10 cut along a plane perpendicular to the width direction.

[0038] 6, nanowires NW are formed on nanowire production jig 10 so as to bridge between protrusions 12 adjacent in the roll direction (step S21). When transfer material 35 comes into contact with nanowire production jig 10 from the state of step S21, nanowires NW are transferred to transfer material 35 (step S22). When transfer material 35 and film substrate 11 are separated from each other from step S22, nanowires NW in contact with transfer material 35 are held by transfer material 35, resulting in nanowire transfer body 20 in which nanowires NW are transferred to transfer material 35.

[0039] (Nanowire manufacturing method) In the nanowire production method of the second embodiment, in step S4 of FIG. 4, the transfer material 35 is brought into contact with the nanowire production jig 10, and then the transfer material 35 is separated from the nanowire production jig 10, forming the nanowire transfer body 20.

[0040] As described above, the nanowire manufacturing tool 10, the nanowire transfer bodies 20 and 40, the nanowire manufacturing apparatuses 1 and 31, and the nanowire manufacturing methods described in the embodiments can be understood, for example, as follows.

[0041] The nanowire production jig 10 of the first embodiment is a nanowire production jig 10 used for producing nanowires NW, and comprises a film substrate 11 that can be wound in a roll direction, a plurality of protrusions 12 that protrude from the film substrate 11, extend in a width direction perpendicular to the roll direction, and are arranged at predetermined intervals in the roll direction, and a conductive film pattern 13 that is arranged on the film substrate 11 and the plurality of protrusions 12, and that forms nanofibers NF that serve as the core material of the nanowires NW between adjacent protrusions 12.

[0042] According to this configuration, the nanowires NW can be continuously produced in the nanowire producing jig 10, and therefore the cost of producing the nanowires NW can be reduced.

[0043] In a second aspect, the cross section of the protrusion 12 taken along a plane perpendicular to the width direction has a mountain shape having an apex.

[0044] According to this configuration, the nanofibers NF can be suitably formed between the protrusions 12.

[0045] In a third embodiment, the protrusion 12 is a portion formed by folding a part of the film substrate 11 in a mountain-like manner, and the film substrate 11 serves as a transfer film onto which the produced nanowires NW are transferred.

[0046] According to this configuration, the nanowires NW can be transferred to the film substrate 11 by pulling the film substrate 11.

[0047] As a fourth aspect, the device further includes a transfer material 35 that is provided opposite the film substrate 11 and that transfers the nanowires NW manufactured on the film substrate 11.

[0048] According to this configuration, the nanowires NW can be transferred onto the transfer material 35.

[0049] The nanowire transfer body of the fifth embodiment is a nanowire transfer body 20 onto which the nanowire NW manufactured using the above-mentioned nanowire production jig 10 has been transferred, and the film substrate 11 of the nanowire production jig 10 is pulled in the roll direction to pull the mountain-folded protrusions 12 so that they are flush with the film substrate 11, and the nanowire NW formed between adjacent protrusions 12 is transferred to the film substrate 11.

[0050] According to this configuration, the nanowire manufacturing jig 10 can also be used as the nanowire transfer body 20 .

[0051] The nanowire transfer body of the sixth aspect is a nanowire transfer body 40 onto which the nanowire NW manufactured using the above-mentioned nanowire manufacturing jig 10 has been transferred, and by peeling it off from the film substrate 11, it becomes the transfer material 35 containing the transferred nanowire NW.

[0052] According to this configuration, the nanowire manufacturing jig 10 can be separately collected and reused.

[0053] The nanowire manufacturing apparatus of the seventh aspect is a nanowire manufacturing apparatus 1, 31 that uses the above-mentioned nanowire manufacturing jig 10 to manufacture the nanowire NW, wherein the nanowire manufacturing jig 10 is wound in the rolling direction and includes a supply unit 4 that supplies the wound nanowire manufacturing jig 10 in the rolling direction, a fiber forming unit 5 that forms nanofibers NF that serve as the core material of the nanowire NW on the supplied nanowire manufacturing jig 10, a thin film forming unit 6 that forms a metal thin film MF on the nanofiber NF to form the nanowire NW, and a recovery unit 7 that winds the nanowire manufacturing jig 10 in the rolling direction and recovers it after the nanowire NW has been manufactured.

[0054] According to this configuration, the nanowires NW can be continuously produced in the nanowire producing jig 10, and therefore the cost of producing the nanowires NW can be reduced.

[0055] The nanowire production method of the eighth aspect is a nanowire production method that uses the above-mentioned nanowire production jig 10 to produce the nanowire NW, wherein the nanowire production jig 10 is wound in the rolling direction, and includes step S1 of supplying the wound nanowire production jig 10 in the rolling direction, step S2 of forming nanofibers NF that will serve as the core material of the nanowire NW on the supplied nanowire production jig 10, step S3 of forming a metal thin film MF on the nanofiber NF to produce the nanowire NW, and step S5 of winding the nanowire production jig 10 in the rolling direction and recovering it after the nanowire NW has been produced.

[0056] According to this configuration, the nanowires NW can be continuously produced in the nanowire producing jig 10, and therefore the cost of producing the nanowires NW can be reduced. [Explanation of symbols]

[0057] 1. Nanowire manufacturing equipment 4 Supply section 5 Fiber forming section 6 Thin film forming section 7. Recovery Department 10 Nanowire manufacturing jig 11 Film substrate 12 Protrusion 13 Conductive film pattern 15 Valley fold line 16 Cutting 20 Nanowire transfer body 31 Nanowire manufacturing equipment 33 Transcription section 34 Transfer roll 35 Transfer material 40 Nanowire transfer body NW nanowire NF Nanofiber MF Metal Thin Film

Claims

1. A nanowire production tool used in producing nanowires, comprising: a film substrate that can be wound in a roll direction; a plurality of protrusions provided to protrude from the film substrate, extending in a width direction perpendicular to the roll direction, and provided at predetermined intervals in the roll direction; a conductive film pattern provided on the film substrate and the plurality of protrusions, for forming nanofibers that serve as core materials for the nanowires between adjacent protrusions.

2. The nanowire manufacturing jig according to claim 1 , wherein the cross section of the protrusion taken along a plane perpendicular to the width direction has a mountain shape with an apex.

3. the protrusion is a portion formed by folding a part of the film substrate; 3. The nanowire manufacturing tool according to claim 1, wherein the film substrate is a transfer film onto which the manufactured nanowires are transferred.

4. The nanowire manufacturing tool according to claim 1 , further comprising a transfer material provided opposite the film substrate and used to transfer the nanowires manufactured on the film substrate.

5. A nanowire transfer body to which the nanowires are transferred, which is manufactured using the nanowire manufacturing tool according to claim 3, The film substrate of the nanowire production jig is pulled in the roll direction, causing the mountain-folded protrusions to be pulled so that they are flush with the film substrate, and the nanowires formed between adjacent protrusions are transferred to the film substrate to form a nanowire transfer body.

6. A nanowire manufacturing apparatus for manufacturing nanowires using the nanowire manufacturing tool according to any one of claims 1 to 4, comprising: the nanowire production jig is wound in the roll direction; a supply unit that supplies the wound nanowire manufacturing jig in the direction of the roll; a fiber forming unit that forms nanofibers that serve as core materials for the nanowires on the supplied nanowire production jig; a thin film forming unit for forming a metal thin film on the nanofiber to form the nanowire; a recovery unit that recovers the nanowire production jig by rolling it up in a roll direction after the nanowires have been produced.

7. A nanowire manufacturing method for manufacturing the nanowire using the nanowire manufacturing tool according to any one of claims 1 to 4, comprising the steps of: the nanowire production jig is wound in the roll direction; feeding the wound nanowire production jig in the direction of the roll; forming nanofibers that will be core materials of the nanowires on the supplied nanowire production jig; forming a metal thin film on the nanofiber to form the nanowire; and recovering the nanowire manufacturing jig after the nanowire has been manufactured by rolling it up in a roll direction.

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