Aluminum oxide template clamping device and efficient preparation method of aluminum oxide template

Abstract

The invention discloses an aluminum oxide template clamping device and an efficient preparation method of an aluminum oxide template, and relates to the technical field of nanometer material preparation, the aluminum oxide template clamping device comprises a base plate, a first fixing piece and at least one second fixing piece, and the first fixing piece and the at least one second fixing piece are arranged on the base plate; the first fixing piece is arranged in the middle of the base plate to clamp the aluminum oxide template and is movably connected with the base plate, and the second fixing pieces are arranged on the two sides of the first fixing piece respectively and are movably connected with the base plate. According to the technical scheme provided by the invention, the aluminum oxide template and the negative electrode are respectively clamped by adopting the matching of the substrate and the fixing piece, so that the electrodes and the electrolytic tank are separated for use, the structure of the electrolytic tank is simplified, the limitation of the electrolytic tank on the aluminum oxide template is reduced, the contact surface is enlarged, and the service life of the electrolytic tank is prolonged. Therefore, the oxide layer with a larger area can be obtained, the size of the negative electrode is not limited any more, and the preparation efficiency of the oxide layer can be further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nanomaterial preparation, and particularly relates to an alumina template clamping device and an efficient preparation method of an alumina template. BACKGROUND

[0002] At present, nanowire arrays composed of various materials have been successfully prepared by chemical vapor deposition, molecular beam epitaxy, hydrothermal method and template method. However, the chemical vapor deposition method needs expensive equipment, the molecular beam epitaxy method is too high in cost, the sample morphology prepared by the hydrothermal method is not easy to control, and the sample morphology prepared by the template method is uniform and excellent in performance.

[0003] In the preparation of the alumina template, the anodic alumina template is low in preparation cost, good in heat resistance and chemical stability, and therefore is widely concerned. At present, the preparation process of the alumina template is relatively mature, but is limited to the preparation of thin alumina templates. With the increase of the application of nanomaterials in various industries, the preparation of super-thick alumina templates is in demand.

[0004] In the preparation of the alumina template by the traditional oxidation method, the electrode is usually used in cooperation with an electrolytic cell, and needs to be powered to react quickly. The operation is inconvenient, the contact area between the alumina template and the electrolytic cell is usually limited, and the preparation of a super-thick and super-large oxide layer cannot be realized in a short time. Therefore, the oxidation method and the corresponding device need to be improved. SUMMARY

[0005] In order to improve the preparation efficiency of the super-thick and super-large oxide layer, the present application provides an alumina template clamping device and an efficient preparation method of an alumina template.

[0006] The present application provides the following technical solution to solve the above technical problems: an alumina template clamping device, comprising a base plate, a first fixing member and at least one second fixing member arranged on the base plate;

[0007] The first fixing member is arranged at the middle part of the base plate to clamp the alumina template and is movably connected with the base plate, and the second fixing member is movably connected with the base plate on both sides of the first fixing member.

[0008] In an embodiment, the first fixing member is threadedly connected with the base plate, and the second fixing member is threadedly connected or slidably connected with the base plate.

[0009] In an embodiment, the alumina template clamping device further comprises a negative electrode, and the negative electrode is fixed on the same side of the alumina template on the base plate through the second fixing member.

[0010] In an embodiment, the first fixing member and the second fixing member are electrically conductive at an end close to the alumina template, and the electrically conductive end of the first fixing member and the second fixing member are electrically connected to an external power supply device.

[0011] In an embodiment, an end of the first fixing member away from the alumina template is insulated.

[0012] In an embodiment, an end of the first fixing member close to the alumina template is provided with a clamping member, and the clamping member is an elastic member.

[0013] To solve the above technical problems, the present application provides another technical solution as follows: a high-efficiency preparation method of an alumina template, comprising the following steps:

[0014] An initial template of alumina is obtained, and the surface of the initial template is pretreated;

[0015] The pretreated initial template is placed in an oxidizing solution for primary oxidation to obtain a primary oxidation template;

[0016] The primary oxidation template is placed in a preset solution to remove the oxidation layer, so that nano pits are formed on the surface of the primary oxidation template to obtain a base template;

[0017] The base template is placed in the same preset oxidizing solution, a preset voltage is applied for oxidation to obtain a secondary oxidation template;

[0018] The secondary oxidation template is placed in a preset acidic solution for surface impurity removal and hole expansion to obtain a target template.

[0019] In an embodiment, the pretreated initial template is placed in an oxidizing solution for primary oxidation, which specifically comprises the following steps:

[0020] The pretreated initial template is placed in an oxalic acid solution with a concentration of 0.2 mol / L, a voltage of 60 V is applied, and the duration is 30 min at an ambient temperature of 5℃.

[0021] In an embodiment, the application of the preset voltage for oxidation specifically comprises a voltage rising process and a voltage falling process.

[0022] The voltage rising process comprises first applying a voltage of 60 V for 5 min, and then rising to a preset voltage of 100 V-140 V at a voltage rising rate of 1 V / min;

[0023] The voltage falling process comprises falling the preset voltage of 100 V-140 V at a voltage falling rate of 0.5 V / min, and finally falling to a voltage of 5 V.

[0024] In an embodiment, the secondary oxidation template is placed in a preset acidic solution for surface impurity removal and hole expansion, and the preset acidic solution is a phosphoric acid solution with a volume fraction of 10%.

[0025] The technical scheme of the present application realizes the separate clamping of the two electrodes of the alumina template and the negative electrode by the cooperation of the substrate and the fixing member, realizes the separate use of the electrode and the electrolytic cell, simplifies the structure of the electrolytic cell, reduces the limitation of the electrolytic cell on the alumina template, expands the contact area, so that a larger area of the oxidation layer can be obtained, and the size of the negative electrode is no longer limited, so that the preparation efficiency of the oxidation layer can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of an alumina template clamping device provided by the first embodiment of the present application.

[0027] Figure 2 is a step flow chart of an efficient preparation method of an alumina template provided by the second embodiment of the present application.

[0028] Figure 3 is a cross-sectional SEM of a super-thick alumina template of an efficient preparation method of an alumina template provided by the second embodiment of the present application Figure 1 .

[0029] Figure 4 is a cross-sectional SEM of a super-thick alumina template of an efficient preparation method of an alumina template provided by the second embodiment of the present application Figure 2 .

[0030] Figure 5 is a physical diagram of a super-thick alumina template of an efficient preparation method of an alumina template provided by the second embodiment of the present application.

[0031] The drawings are explained as follows:

[0032] 1. An alumina template clamping device;

[0033] 11. A substrate; 12. A first fixing member; 13. A second fixing member; 14. A negative electrode;

[0034] 121. A clamping member. DETAILED DESCRIPTION

[0035] The technical scheme 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 specific embodiments described here are only used to explain the present application, and are not used to limit the present application. The specific embodiments described are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, motion condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0037] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0038] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and examples.

[0039] At present, nanowire arrays composed of various materials have been successfully prepared by chemical vapor deposition, molecular beam epitaxy, hydrothermal method, template method and other methods. However, chemical vapor deposition requires expensive equipment, molecular beam epitaxy has high cost, and the morphology of samples prepared by hydrothermal method is not easy to control, while the morphology of samples prepared by template method assisted by template is uniform and has excellent performance. Among them, anodic aluminum oxide template is widely concerned because of its low preparation cost, good heat resistance and good chemical stability.

[0040] Anodic aluminum oxide template is a porous nanometer structure material formed by self-organizing electrochemical oxidation process of high-purity aluminum substrate in acidic electrolyte system under anodic polarization. Its essence is the result of synergistic effect of oxidation reaction and hydrolysis reaction of aluminum substrate under anodic polarization condition, and finally forms a nanometer pore array structure with hexagonal close-packed arrangement, the pore diameter distribution range is 10 nm-400 nm, and the pore density can reach 10 11 cm -2 order of magnitude.

[0041] In the preparation of the alumina template, the anodic alumina template has low preparation cost, good heat resistance and good chemical stability, so it has attracted widespread attention. At present, the preparation process of the alumina template has been relatively mature, but it is limited to the preparation of thin alumina template. The increase of the application of nanomaterials in various industries has put forward the demand for the preparation of super-thick alumina template.

[0042] However, when the alumina template is prepared by the traditional oxidation method, the electrode is usually used with the electrolytic cell, and the electrode needs to be powered on to react quickly, which is inconvenient to operate. The contact area between the alumina template and the electrolytic cell is usually limited, and it is difficult to prepare a super-thick and super-large oxidation layer in a short time. Therefore, the oxidation method and the corresponding device need to be improved.

[0043] In order to improve the efficient preparation of super-thick and super-large oxidation layer, the application provides an alumina template clamping device and an efficient preparation method of alumina template.

[0044] Please refer to Figure 1 An alumina template clamping device 1 comprises a base plate 11, a first fixing member 12 and at least one second fixing member 13 arranged on the base plate 11; the first fixing member 12 is arranged at the middle of the base plate 11 to clamp the alumina template and is movably connected with the base plate 11, and the second fixing member 13 is arranged on both sides of the first fixing member 12 and is movably connected with the base plate 11.

[0045] It should be noted that, in order to simplify the structure of the electrolytic cell, the negative electrode 14 is separated from the electrolytic cell, so it is necessary to clamp the two electrodes manually or by a device to make the whole process stable;

[0046] Therefore, corresponding clamping positions are arranged on the alumina template clamping device 1 to clamp the two electrodes respectively, and the alumina template to be oxidized also needs to be clamped, so that the alumina template and the negative electrode 14 can be placed in the electrolyte at the same time for reaction.

[0047] It can be understood that the size of the negative electrode 14 is not limited, and the size of the negative electrode 14 can be large enough to ensure sufficient reaction rate, as long as the electrolytic cell can accommodate it;

[0048] The negative electrode 14 is arranged on both sides of the alumina template, which can promote more efficient reaction.

[0049] Specifically, in the embodiment of the application, the size of the negative electrode 14 is the same, and the orthographic projection of the negative electrode 14 on the alumina template coincides with the alumina template.

[0050] In an embodiment, the first fixing member 12 is threadedly connected with the base plate 11, and the second fixing member 13 is threadedly connected or slidably connected with the base plate 11.

[0051] It should be noted that the threaded connection of the first fixing member 12 and the base plate 11 can adjust the clamping height of the aluminum oxide template by screwing in and out, and the adjustment is made without changing the position of the base plate 11, so that the contact area between the aluminum oxide template and the electrolyte is adjusted.

[0052] In addition, the second fixing member 13 is slidably connected to the base plate 11, which can make the height adjustment of the negative electrode 14 more smooth, and can be stably fixed by manually setting the buckle or clamping member 121, and is more convenient to use.

[0053] In an embodiment, the aluminum oxide template clamping device 1 further comprises a negative electrode 14, and the negative electrode 14 is fixed on the same side of the aluminum oxide template on the base plate 11 through the second fixing member 13.

[0054] It should be noted that the negative electrode 14 can be fixedly arranged on the aluminum oxide template clamping device through the second fixing member 13, or can be detachably connected to the base plate 11 on the same side of the working position of the aluminum oxide template, which is not limited here.

[0055] When the negative electrode 14 is fixedly arranged on the base plate 11 through the second fixing member 13, the working position of the negative electrode 14 can be adjusted by adjusting the second fixing member 13, and when the electrode is damaged or needs to be replaced, the second fixing member 13 can be replaced together.

[0056] It can be understood that the negative electrode 14 is fixedly connected or detachably connected to the base plate through the second fixing member 13, which can be adapted to various use occasions, improve the application range of the aluminum oxide template clamping device 1, and improve the convenience of use.

[0057] In an embodiment, the first fixing member 12 and the second fixing member 13 are electrically conductive at one end close to the aluminum oxide template, and the electrically conductive end of the first fixing member 12 and the second fixing member 13 is electrically connected to an external power supply device.

[0058] It should be noted that the contact end of the first fixing member 12 and the second fixing member 13 is set as an electrically conductive structure, so that the external power supply can directly connect the first fixing member 12 and the second fixing member 13 to complete the power supply to the system, and act on the negative electrode 14 and the aluminum oxide template.

[0059] Specifically, in the specific embodiments of the present application, the length of the electrically conductive part of the first fixing member 12 and the second fixing member 13 accounts for at least one half of the length of each.

[0060] In an embodiment, the end of the first fixing member 12 away from the aluminum oxide template is insulated.

[0061] Optionally, in an embodiment, the first fixing member 12 is insulated at an end away from the electrode.

[0062] It should be noted that, if it is necessary to observe the preparation effect during the preparation of the aluminum oxide template, or to fine-tune the size of the contact area between the aluminum oxide template and the electrolytic cell, the first fixing member 12 can be used to adjust.

[0063] In addition, the first fixing member 12 is insulated at one end, or the first fixing member 12 and the second fixing member 13 are insulated at ends away from the electrolyte, which can improve the safety performance of the device and prevent the user from being accidentally touched with the risk of electric shock.

[0064] Specifically, in the specific embodiments of the present application, the first fixing member 12 is provided with a hanging structure at an end away from the aluminum oxide template, which can suspend and support the aluminum oxide template clamping device 1, thereby increasing the number of control modes.

[0065] In an embodiment, the first fixing member 12 is provided with a clamping member 121 at an end close to the aluminum oxide template, and the clamping member 121 is an elastic member.

[0066] It should be noted that the clamping member 121 is also a conductive structure that can guide the current of the first fixing member 12 to the aluminum oxide template.

[0067] Specifically, the clamping member 121 is designed as an elastic member.

[0068] It can be understood that the elastic member can use the extrusion generated by elastic deformation to generate friction force to prevent the aluminum oxide template from sliding downward under the influence of gravity, and within the elastic limit, the clamping member 121 can adapt to aluminum oxide templates of different thicknesses, thereby improving the versatility of different templates.

[0069] Please refer to Figures 2-5 To solve the above technical problems, the present application provides another technical solution as follows: an efficient preparation method of an aluminum oxide template, comprising the following steps:

[0070] S1: obtaining an initial template of aluminum oxide, and pretreating the surface of the initial template;

[0071] S2: placing the pretreated initial template into an oxidation solution for primary oxidation to obtain a primary oxidation template;

[0072] S3: placing the primary oxidation template into a pre-set solution to remove the oxidation layer, so that nano pits are formed on the surface of the primary oxidation template to obtain a base template;

[0073] S4: placing the base template into the same pre-set oxidation solution, and applying a pre-set voltage for oxidation to obtain a secondary oxidation template;

[0074] S5: Put the secondary oxidation template into a preset acidic solution for surface impurity removal and hole expansion to obtain a target template.

[0075] Specifically, in the specific embodiment of the present application, the initial template of aluminum oxide is selected to have a thickness of 0.5 mm. The pretreatment of the initial template first requires the initial template to be cut into a metal sheet, then clamped by the aluminum oxide template clamping device 1, immersed in anhydrous ethanol for ultrasonic cleaning for 10 min to remove surface grease, and then placed in a muffle furnace for annealing at 500℃ for 2h.

[0076] Further, after the initial template of aluminum oxide is annealed, the initial template of aluminum oxide after annealing is clamped by the aluminum oxide template clamping device 1, and is placed in a NaOH solution with a concentration of 1 mol / L for rough polishing for 5 min to remove the oxide layer formed on the aluminum sheet in the air.

[0077] The process specifically manifests that dense small bubbles are continuously generated on the surface of the initial template of aluminum oxide, i.e., rough polishing is completed.

[0078] After the rough polishing of the initial template of aluminum oxide is completed, the initial template of aluminum oxide can be clamped by the aluminum oxide template clamping device 1, placed in a polishing solution composed of perchloric acid and anhydrous ethanol mixed at a volume ratio of 1:4, and subjected to electrochemical polishing with the initial template of aluminum oxide as an anode and a direct current voltage of 20V applied for 8-10 min. The polished part of the sample presents a mirror effect, i.e., electrochemical polishing is completed.

[0079] Optionally, in the specific embodiment of the present application, the negative electrode can be an aluminum sheet, a graphite electrode, etc.

[0080] In an embodiment, the pretreated initial template is placed in an oxidizing solution for primary oxidation, specifically including the following steps:

[0081] The pretreated initial template is clamped by the aluminum oxide template clamping device 1, placed in an oxalic acid solution with a concentration of 0.2 mol / L, and a voltage of 60V is applied to the negative electrode of the aluminum oxide template clamping device 1 and the initial template, and the temperature is 5℃ and the duration is 30 min.

[0082] It should be noted that the end of the first fixing member 12 away from the aluminum oxide template is insulated, and the end close to the initial template is conductive. Therefore, the voltage applied to the pretreated initial template can be applied to the end of the first fixing member 12 close to the initial template.

[0083] The preset solution used to remove the oxide layer of the primary oxidation template is phosphoric acid with a volume fraction of 10%.

[0084] Specifically, in the specific embodiment of the present application, the time for removing the primary oxidation layer is 3h, and the reaction temperature is 20℃.

[0085] In an embodiment, the applying the preset voltage for oxidation specifically comprises a boosting process and a reducing process:

[0086] The boosting process comprises applying a voltage of 60 V for 5 min, and then boosting to a preset voltage of 100 V-140 V at a boosting rate of 1 V / min;

[0087] Then the reducing process is performed, wherein:

[0088] The reducing process comprises reducing the preset voltage of 100 V-140 V at a reducing rate of 0.5 V / min, and finally reducing the voltage to 5 V.

[0089] Specifically, in the embodiment of the present application, the preset voltage is 120 V.

[0090] More specifically, in the embodiment of the present application, the boosting process comprises applying a voltage of 60 V for 5 min, and then boosting to 120 V at a boosting rate of 1 V / min, and then starting timing.

[0091] After boosting to 120 V, timing for 3 h, and then slowly reducing the voltage at a reducing rate of 0.5 V / min, and finally reducing the voltage to 5 V for 2 min, and then turning off the power to obtain a secondary oxidation template.

[0092] In an embodiment, the secondary oxidation template is placed in a preset acidic solution for surface impurity removal and pore expansion. The preset acidic solution is a phosphoric acid solution with a volume fraction of 10% and a temperature of 20°C. The impurity removal and pore expansion time is 1 h, i.e. soaking for 1 h.

[0093] It can be understood that, in the method, the alumina template holder is used to make the alumina template as an anode, i.e. a positive electrode, and each side provides a cathode, i.e. a negative electrode, thereby expanding the electrode area, increasing the contact area between the alumina template and the electrolyte, and making the small-area alumina template commonly used for oxidation into a large-area alumina template, so that the front and back surfaces of the alumina template are both oxidized.

[0094] At the same time, the traditional mild oxidation with low current and low voltage is changed to hard oxidation with high current and high voltage, which greatly improves the thickness growth rate of the alumina template and the sample preparation efficiency. It provides more possibilities for the alumina template in the preparation of nanowires.

[0095] The application provides an aluminum oxide template clamping device, which realizes the separate clamping of the aluminum oxide template and the negative electrode by adopting the cooperation of the base plate and the fixing piece, realizes the separate use of the electrode and the electrolytic cell, simplifies the structure of the electrolytic cell, reduces the limitation of the electrolytic cell on the aluminum oxide template, expands the contact area, so that a larger area of the oxidation layer can be obtained, and the size of the negative electrode is no longer limited, so that the preparation efficiency of the oxidation layer can be further improved.

[0096] It should be understood that every technical feature mentioned in the specification as "one embodiment" or "an embodiment" means that the specific feature, structure or property related to the embodiment is included in at least one embodiment of the application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or properties can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the application.

[0097] In various embodiments of the application, it should be understood that the size of the sequence number of the above processes does not mean the inevitable sequence of execution, and the execution sequence of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the application.

[0098] In the flowcharts and block diagrams in the drawings of the present application, the possible implementation architecture, function and operation of the system, method and computer program product according to various embodiments of the present application are illustrated. In this regard, each block in the flowchart or block diagram can represent a module, a program segment or a part of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks can also occur in different order from that marked in the drawings. For example, two blocks represented in succession can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, based on the functions involved. It should be particularly noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for executing the specified function or operation, or can be implemented by a combination of special hardware and computer instructions.

[0099] The above has carried out the detailed introduction to the aluminum oxide template clamping device and the efficient preparation method of the aluminum oxide template disclosed in the embodiment of the application, the principle and implementation mode of the application are described in this paper by applying specific examples, the above embodiment is only used for helping understanding the method of the application and its core idea; at the same time, for the general technical personnel in the art, according to the idea of the application, the specific implementation mode and application range will have changes, and the above is not understood as the limitation of the application, any modification, equivalent replacement and improvement within the principle of the application should be included in the protection scope of the application.

Claims

1. An alumina template clamping device, characterized by: It includes a substrate, a first fixing member and at least one second fixing member provided on the substrate; The first fixing member is arranged in the middle of the substrate to clamp the alumina template and is movably connected to the substrate. The second fixing members are arranged on both sides of the first fixing member and are movably connected to the substrate.

2. The alumina template clamping device according to claim 1, characterized in that: The first fixing member is threadedly connected to the base plate, and the second fixing member is threadedly connected or slidably connected to the base plate.

3. The alumina template clamping device according to claim 1, characterized in that: The alumina template clamping device also includes a negative electrode, and the negative electrodes are fixed on the same side of the alumina template on the substrate through a second fixing member.

4. The alumina template clamping device according to claim 1, characterized in that: One end of the first fixing member and the second fixing member close to the alumina template are both conductive, and the conductive ends of the first fixing member and the second fixing member are both electrically connected to an external power supply device.

5. The alumina template clamping device according to claim 4, characterized in that: One end of the first fixing member away from the alumina template is insulated.

6. The alumina template clamping device according to claim 1, characterized in that: A clamping piece is provided on one end of the first fixing piece close to the alumina template, and the clamping piece is an elastic piece.

7. An efficient preparation method of an alumina template, characterized in that The steps include: Obtaining an initial aluminum oxide template and pre-treating the surface of the initial template; The pretreated initial template is placed in an oxidizing solution for primary oxidation to obtain a primary oxidized template; The primary oxidation template is placed in a preset solution to remove the oxide layer, so that nano-pits are formed on the surface of the primary oxidation template to obtain a matrix template; The substrate template is placed in the same preset oxidation solution and a preset voltage is applied for oxidation to obtain a secondary oxidation template; The secondary oxidation template is placed in a preset acidic solution for surface impurity removal and pore expansion to obtain the target template.

8. The method for efficiently preparing an alumina template according to claim 7, wherein: The pre-treated initial template is placed in an oxidation solution for primary oxidation, which specifically includes the following steps: The pretreated initial template was placed in a 0.2 mol / L oxalic acid solution and a voltage of 60 V was applied for 30 min at an ambient temperature of 5°C.

9. The method for efficiently preparing an alumina template according to claim 7, wherein: Applying a preset voltage for oxidation specifically includes a boost process and a buck process: The voltage boost process involves applying a 60 V voltage for 5 minutes, and then increasing it to a preset voltage of 100 V to 140 V at a rate of 1 V / min. The voltage reduction process involves reducing the preset voltage from 100 V to 140 V at a rate of 0.5 V / min until the voltage is finally reduced to 5 V.

10. The method for efficiently preparing an alumina template according to claim 7, wherein: The secondary oxidation template is placed in a preset acidic solution for surface impurity removal and pore expansion. The preset acidic solution is a phosphoric acid solution with a volume fraction of 10%.

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