CN109440148A - A kind of preparation method and applications of palladium cobalt nanowire - Google Patents
A kind of preparation method and applications of palladium cobalt nanowire Download PDFInfo
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- CN109440148A CN109440148A CN201811266288.1A CN201811266288A CN109440148A CN 109440148 A CN109440148 A CN 109440148A CN 201811266288 A CN201811266288 A CN 201811266288A CN 109440148 A CN109440148 A CN 109440148A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
- B22F1/0547—Nanofibres or nanotubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/07—Metallic powder characterised by particles having a nanoscale microstructure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/12—Anodising more than once, e.g. in different baths
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/567—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of platinum group metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
- G01N27/127—Composition of the body, e.g. the composition of its sensitive layer comprising nanoparticles
Abstract
The invention discloses a kind of preparation method and applications of palladium cobalt nanowire, include the following steps: to prepare anodic oxidation aluminium formwork first；Configure palladium cobalt electrolyte: by PdCl2、CoSO4·7H2O and H3BO3·7H2O mixing, with salt acid for adjusting pH；By the palladium cobalt bath deposition on anodic oxidation aluminium formwork, the palladium cobalt nanowire has been obtained.By the way that cobalt is added in palladium in the present invention, so that the structurally ordered arrangement of palladium cobalt nanowire of preparation, and then sensitivity, response time and recovery time can be increased when applying in the sensor, and eliminate or reduce the palladium metal stability difference as caused by the conditions such as density of hydrogen, operating temperature defect, obtained high sensitivity, temperature applicable range extensively, integrability, low-power consumption and excellent in stability hydrogen gas sensor.
Description
Technical field
The invention belongs to technical field of polymer materials, and in particular to a kind of preparation method of palladium cobalt nanowire and its answer
With.
Background technique
Hydrogen plays important role in modern industry, and the reasonable employment of hydrogen can be the development of human society
Very big power-assisted is provided.However, many unsafe conditions are often faced with during using hydrogen, especially in transport, storage
Link, there are all multivariates, small carelessness to be likely to cause hydrogen leak for outdoor diversified environment, endangers huge.Cause
This, the hydrogen detectability under unconventional situation is particularly significant.Monodimension nanometer material is because having special construction, in chemistry, object
Reason etc. shows outstanding performance, becomes the area research hot spot.
Pd because of metal has good reactivity worth to hydrogen, is largely constantly reported about its correlative study as sensitive material
Road.Pd can react in air with hydrogen, form Pd-H system.When contacting the metal surface Pd, H2It can be with Pd atomic surface
Electron interaction so that H2Molecule is decomposed into H atom, and depends on Pd.H atom enters Pd metal grate and forms PdHx,
At this time according to the difference of H/Pd content, there are two kinds of solid phases of α phase and β phase.When room temperature, as H/Pd < 0.008, it is α phase, works as H/
It is β phase when Pd > 0.067.With increasing for hydrogen atom content, the cell volume of Pd expands, and changes resistivity, causes material
Resistance changes.By measuring resistance variation value, the content of Hydrogen in Air can be calculated.
Since the lattice parameter of two-phase has a certain distance, repeatedly two alternate circulations can cause the distortion of material broken
It splits, ultimately causes permanent destruction, is i.e. " hydrogen embrittlement " phenomenon, reduce the stability of Pd sensor.In addition, the change of temperature can draw
The opposite air-sensitive behavior of Pd metal is played, resistance variations mode is caused to change, becomes resistance reduction from hydrogen resistance increase is absorbed, seriously
Influence sensor can temperature range of operation.Pure Pd is mixed usually using some disparate metals atoms, improves the upper of pure Pd material
State disadvantage.
For these reasons, the present invention is specifically proposed.
Summary of the invention
In order to solve problem above of the existing technology, the present invention provides a kind of preparation method of palladium cobalt nanowire and
It is applied, by the way that cobalt is added in palladium in the present invention, so that the structurally ordered arrangement of palladium cobalt nanowire of preparation, and then in sensor
Sensitivity, response time and recovery time can be increased when middle application.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of preparation method of palladium cobalt nanowire, includes the following steps:
(1) anodic oxidation aluminium formwork is prepared first；
(2) palladium cobalt electrolyte is configured: by PdCl2、CoSO4·7H2O and H3BO3·7H2O mixing, with salt acid for adjusting pH；
(3) the palladium cobalt bath deposition palladium cobalt nanowire has been obtained on anodic oxidation aluminium formwork.
Further, anodic oxidation aluminium formwork is prepared via a method which:
(a) aluminium flake is impregnated in acetone, is rinsed with water, air-dried；
(b) aluminium flake after air-drying makes annealing treatment under argon atmosphere；
(c) aluminium flake then handled with oxalic acid solution oxidizing annealing obtains the aluminium flake of first anode oxidation, is soaked with phosphorus chromic acid
Striping is steeped, then carries out second of anodic oxidation with oxalic acid solution；
(d) by SnCl4It is added on the aluminium flake by second of anodic oxidation, is impregnated through water, dry, be then placed in phosphorus
It is impregnated in acid solution, metal spraying processing obtains the anodic oxidation aluminium formwork.
Further, 8-12min is impregnated in step (a), it is preferred that impregnate 10min.
Further, annealing temperature is 500-600 DEG C in step (b), time 9-11h, it is preferred that annealing
Temperature is 550 DEG C, time 10h.
Further, first time anodic oxidation is identical with the condition of second of anodic oxidation in step (c), oxalic acid solution
Concentration is 0.2-0.4mol/L, oxidization time 7-9h.
Further, 25-35min is impregnated in step (d) in water, drying temperature is 60-80 DEG C, dries 10-14h.
Further, the concentration of step (d) phosphoric acid is 4-6%, and 40-60min is impregnated in phosphoric acid.
For the hole of the anodic oxidation aluminium formwork of method preparation of the invention in fine and close, parallelly distribute on, size is close, average hole
Gap diameter is about 30nm, has apparent regular hexagon shape, is conducive to a large amount of production hydrogen gas sensor sensitive materials.
Further, PdCl in step (1)2Concentration be 0.008-0.012mol/L, CoSO4·7H2The concentration of O is
0.013-0.017mol/L and H3BO3·7H2The concentration of O is 0.013-0.017mol/L.
Further, pH value is adjusted in step (1) to 2-3.
Application of the palladium cobalt nanowire of preparation method preparation described in a kind of in hydrogen gas sensor.
Palladium cobalt nanowire prepared by the present invention needs to be handled as follows before being prepared into sensor: by what is be prepared
Palladium cobalt nanowire, which is dissolved in the sodium hydroxide solution of 4mol/L, removes anodic oxidation aluminium formwork, is repeatedly rinsed using deionized water
Sample and drying, finally in ethanol by palladium cobalt nanowire obtained dissolution, ultrasonic vibration, realization is evenly dispersed, obtains palladium cobalt
Nano wire/ethanol liquid, it can prepare sensor.
Sensor the preparation method is as follows: palladium cobalt nanowire/ethanol liquid of preparation is added drop-wise in interdigital electrode, divulge information
Drying, secondly, interdigital electrode is fixed in sensor base using conductive silver glue.Finally, by welding wire machine pressure welding aluminium wire with
Interdigital electrode both ends and pedestal pin are connected, hydrogen gas sensor is obtained.
Compared with prior art, the invention has the benefit that
By the way that cobalt is added in palladium in the present invention, so that the structurally ordered arrangement of palladium cobalt nanowire of preparation, and then sensing
Sensitivity, response time and recovery time can be increased when applying in device, and eliminate or reduce by density of hydrogen, operating temperature etc.
The defect of palladium metal stability difference caused by condition, has obtained that high sensitivity, temperature applicable range be wide, integrability, low-power consumption
With the hydrogen gas sensor of excellent in stability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the Electronic Speculum surface sweeping figure of anodic oxidation aluminium formwork of the invention；
Fig. 2 is the Electronic Speculum surface sweeping figure of anodic oxidation aluminium formwork of the invention；
Fig. 3 is the SEM figure of palladium cobalt nanowire of the invention；
Fig. 4 is the XRD diagram of palladium cobalt nanowire of the invention；
Fig. 5 is palladium cobalt sensor sensitivity curve under different hydrogen concentration under room temperature of the invention；
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
Embodiment 1
The preparation method of the palladium cobalt nanowire of the present embodiment, includes the following steps:
(1) anodic oxidation aluminium formwork is prepared first；
(2) palladium cobalt electrolyte is configured: the PdCl for being 0.008mol/L by concentration2, concentration be 0.013mol/L CoSO4·
7H2The H that O and concentration are 0.013mol/L3BO3·7H2O mixing, with salt acid for adjusting pH to 2；
It (3) is to electrode with graphite plate, at room temperature, adjusting constant voltage is 1.5-2.0V, by the palladium
Cobalt bath deposition has obtained the palladium cobalt nanowire in the nanoaperture on anodic oxidation aluminium formwork.
The anodic oxidation aluminium formwork of the present embodiment the preparation method is as follows:
(a) aluminium flake is impregnated into 8min in acetone, is rinsed with deionized water, air-dried；
(b) aluminium flake after air-drying makes annealing treatment under argon atmosphere, and temperature asks 500 DEG C, and constant temperature time is that 9h anneals to go
Except inside aluminium flake stress and other defects, improve the crystallinity of aluminium；
(c) then at 5 DEG C, the aluminium flake handled with the oxalic acid solution oxidizing annealing of 0.2mol/L aoxidizes 7h, voltage setting
For 50V, the aluminium flake of first anode oxidation is obtained, impregnates striping 2h with phosphorus chromic acid, taking-up washes and dries, and then uses oxalic acid solution
It is identical as first time anodic oxidation condition to carry out second of anodic oxidation；
(d) by SnCl4It is added on the aluminium flake by second of anodic oxidation, impregnates 25min through water, be 60 DEG C in temperature
Lower drying 10h is then placed in 50 DEG C, impregnates 40min in the phosphoric acid solution that concentration is 4% and carry out through-hole processing, use plasma
Body sputter carries out metal spraying processing, obtains the anodic oxidation aluminium formwork.
Embodiment 2
The preparation method of the palladium cobalt nanowire of the present embodiment, includes the following steps:
(1) anodic oxidation aluminium formwork is prepared first；
(2) palladium cobalt electrolyte is configured: the PdCl for being 0.01mol/L by concentration2, concentration be 0.015mol/L CoSO4·
7H2The H that O and concentration are 0.015mol/L3BO3·7H2O mixing, with salt acid for adjusting pH to 2.5；
It (3) is to electrode with graphite plate, at room temperature, adjusting constant voltage is 1.5-2.0V, by the palladium
Cobalt bath deposition has obtained the palladium cobalt nanowire in the nanoaperture on anodic oxidation aluminium formwork.
The anodic oxidation aluminium formwork of the present embodiment the preparation method is as follows:
(a) aluminium flake is impregnated into 10min in acetone, is rinsed with deionized water, air-dried；
(b) aluminium flake after air-drying makes annealing treatment under argon atmosphere, and temperature asks 550 DEG C, and constant temperature time is that 10h anneals to go
Except inside aluminium flake stress and other defects, improve the crystallinity of aluminium；
(c) then at 5 DEG C, the aluminium flake handled with the oxalic acid solution oxidizing annealing of 0.3mol/L aoxidizes 8h, voltage setting
For 50V, the aluminium flake of first anode oxidation is obtained, impregnates striping 2h with phosphorus chromic acid, taking-up washes and dries, and then uses oxalic acid solution
It is identical as first time anodic oxidation condition to carry out second of anodic oxidation；
(d) by SnCl4It is added on the aluminium flake by second of anodic oxidation, impregnates 30min through water, be 70 DEG C in temperature
Lower drying 12h is then placed in 50 DEG C, impregnates 50min in the phosphoric acid solution that concentration is 5% and carry out through-hole processing, use plasma
Body sputter carries out metal spraying processing, obtains the anodic oxidation aluminium formwork.
Anodic oxidation aluminium formwork surface sweeping electron microscope manufactured in the present embodiment is as illustrated in fig. 1 and 2, as shown in Figure 1, anodic oxidation
The hole of aluminum alloy pattern plate is in fine and close, parallelly distribute on, and size is close, and average pore diameter is about 30nm, has obvious positive six side
Shape shape.It can be seen that, the hole in template keeps orderly repeating substantially, and the depth of each hole can be more than 50 μm, put down in Fig. 2
Equal pore diameter is about 70nm, can satisfy the requirement for preparing hydrogen gas sensor sensitive material.Meanwhile hole is intensive enough, one
It is secondary to prepare both available a large amount of nano-materials, conducive to the large-scale production of material.
Palladium cobalt nanowire SEM figure manufactured in the present embodiment is as shown in figure 3, it can be seen from the figure that nanowire diameter is about
70nm, Co are metal-doped among Pd, nano thread ordered arrangement.
XRD analysis is carried out to palladium cobalt nanowire manufactured in the present embodiment, as shown in figure 4, from the figure, it can be seen that with pure Pd
It compares, 2 θ values of Pd/Co alloy are smaller, show that the lattice constant of alloy is greater than pure Pd.
Embodiment 3
The preparation method of the palladium cobalt nanowire of the present embodiment, includes the following steps:
(1) anodic oxidation aluminium formwork is prepared first；
(2) palladium cobalt electrolyte is configured: the PdCl for being 0.012mol/L by concentration2, concentration be 0.017mol/L CoSO4·
7H2The H that O and concentration are 0.017mol/L3BO3·7H2O mixing, with salt acid for adjusting pH to 3；
It (3) is to electrode with graphite plate, at room temperature, adjusting constant voltage is 1.5-2.0V, by the palladium
Cobalt bath deposition has obtained the palladium cobalt nanowire in the nanoaperture on anodic oxidation aluminium formwork.
The anodic oxidation aluminium formwork of the present embodiment the preparation method is as follows:
(a) aluminium flake is impregnated into 12min in acetone, is rinsed with deionized water, air-dried；
(b) aluminium flake after air-drying makes annealing treatment under argon atmosphere, and temperature asks 600 DEG C, and constant temperature time is that 11h anneals to go
Except inside aluminium flake stress and other defects, improve the crystallinity of aluminium；
(c) then at 5 DEG C, the aluminium flake handled with the oxalic acid solution oxidizing annealing of 0.4mol/L aoxidizes 9h, voltage setting
For 50V, the aluminium flake of first anode oxidation is obtained, impregnates striping 2h with phosphorus chromic acid, taking-up washes and dries, and then uses oxalic acid solution
It is identical as first time anodic oxidation condition to carry out second of anodic oxidation；
(d) by SnCl4It is added on the aluminium flake by second of anodic oxidation, impregnates 35min through water, be 80 DEG C in temperature
Lower drying 14h is then placed in 50 DEG C, impregnates 60min in the phosphoric acid solution that concentration is 6% and carry out through-hole processing, use plasma
Body sputter carries out metal spraying processing, obtains the anodic oxidation aluminium formwork.
Test example 1
Palladium cobalt nanowire prepared by embodiment 2 is prepared into hydrogen gas sensor, needs to carry out such as before being prepared into sensor
Lower processing: the palladium cobalt nanowire being prepared being dissolved in the sodium hydroxide solution of 4mol/L and removes anodic oxidation aluminium formwork,
Sample and drying are repeatedly rinsed using deionized water, finally in ethanol by palladium cobalt nanowire obtained dissolution, ultrasonic vibration is real
It is existing evenly dispersed, obtain palladium cobalt nanowire/ethanol liquid, it can prepare sensor.
Sensor the preparation method is as follows: palladium cobalt nanowire/ethanol liquid of preparation is added drop-wise in interdigital electrode, divulge information
Drying, secondly, interdigital electrode is fixed in sensor base using conductive silver glue.Finally, by welding wire machine pressure welding aluminium wire with
Interdigital electrode both ends and pedestal pin are connected, hydrogen gas sensor is obtained.
The detection and analysis of sensitivity are carried out to the hydrogen gas sensor of preparation, as shown in Figure 5, it is specified that transducer sensitivity is electricity
Resistive is than reference resistor value (△ R/R0), before measurement sensor performance, it is first passed through enough nitrogen into cavity, makes cavity
Inside emptying other impurities gas.And 310K at a temperature of, be passed through the hydrogen of 12sccm, it is more steady to sensor signal
Afterwards, hydrogen is closed, waits resistance to restore, repeatedly above-mentioned steps, so that the resistance sizes of material tend in nitrogen environment
Steadily, i.e., baseline tends to be steady, and Cong Tuzhong 5 can be seen that under normal temperature condition, as density of hydrogen reduces, transducer sensitivity
Also it is constantly reducing, is showing preferable linear.And after inverted sequence is passed through the hydrogen of various concentration, the resistance variations of sensor
With approximately reach same level before, sensor sheet reveals preferable repeatability.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of preparation method of palladium cobalt nanowire, which comprises the steps of:
(1) anodic oxidation aluminium formwork is prepared first；
(2) palladium cobalt electrolyte is configured: by PdCl2、CoSO4·7H2O and H3BO3·7H2O mixing, with salt acid for adjusting pH；
(3) the palladium cobalt bath deposition palladium cobalt nanowire has been obtained on anodic oxidation aluminium formwork.
2. the preparation method of palladium cobalt nanowire according to claim 1, which is characterized in that anodic oxidation aluminium formwork is by such as
Lower section method is prepared:
(a) aluminium flake is impregnated in acetone, is rinsed with water, air-dried；
(b) aluminium flake after air-drying makes annealing treatment under argon atmosphere；
(c) aluminium flake then handled with oxalic acid solution oxidizing annealing obtains the aluminium flake of first anode oxidation, is gone with the immersion of phosphorus chromic acid
Then film carries out second of anodic oxidation with oxalic acid solution；
(d) by SnCl4It is added on the aluminium flake by second of anodic oxidation, is impregnated through water, dry, it is molten to be then placed in phosphoric acid
It is impregnated in liquid, metal spraying processing obtains the anodic oxidation aluminium formwork.
3. the preparation method of palladium cobalt nanowire according to claim 2, which is characterized in that impregnate 8- in step (a)
12min, it is preferred that impregnate 10min.
4. the preparation method of palladium cobalt nanowire according to claim 2, which is characterized in that annealing temperature in step (b)
Degree is 500-600 DEG C, time 9-11h, it is preferred that annealing temperature is 550 DEG C, time 10h.
5. the preparation method of palladium cobalt nanowire according to claim 2, which is characterized in that first time anode in step (c)
Oxidation is identical with the condition of second of anodic oxidation, and the concentration of oxalic acid solution is 0.2-0.4mol/L, oxidization time 7-9h.
6. the preparation method of palladium cobalt nanowire according to claim 2, which is characterized in that impregnated in water in step (d)
25-35min, drying temperature are 60-80 DEG C, dry 10-14h.
7. the preparation method of palladium cobalt nanowire according to claim 2, which is characterized in that the concentration of step (d) phosphoric acid is
4-6% impregnates 40-60min in phosphoric acid.
8. the preparation method of palladium cobalt nanowire according to claim 1, which is characterized in that PdCl in step (1)2Concentration
For 0.008-0.012mol/L, CoSO4·7H2The concentration of O is 0.013-0.017mol/L and H3BO3·7H2The concentration of O is
0.013-0.017mol/L。
9. the preparation method of palladium cobalt nanowire according to claim 1, which is characterized in that adjust in step (1) pH value to
2-3。
10. a kind of palladium cobalt nanowire of preparation method preparation described in any one of claim 1-9 is in hydrogen gas sensor
Using.
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