Method for controlling fold degree of ultrathin palladium nanosheet
By regulating the reaction conditions in the solvent thermal method, the wrinkle degree of palladium nanosheets was successfully controlled, and the problem of high wrinkle of palladium nanosheets was solved, and the preparation of ultra-thin palladium nanosheets with high yield and low cost was achieved, with broad electrocatalysis Application prospects.
Patent Information
- Application Number
- CN202310671941.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-08
- Publication Date
- 2024-12-10
AI Technical Summary
The palladium nanosheets synthesized by the existing methods have a high degree of wrinkle, causing the palladium sheets to become thicker together, and the active sites of the overlapping parts are inactivated, making it difficult to obtain flat ultra-thin palladium nanosheets.
The type, dosage, reaction time, reaction temperature, amino ligand type, potassium hydroxide concentration and sodium chloropalladium concentration of the halogen reagent are controlled by the solvothermal method, and the wrinkle degree of palladium nanosheets is controlled, using ethylene glycol, N, Palladium nanosheets were prepared by ternary solution system of N-dimethylformamide and diethylenetriamine, ultrasonic dispersion and oil bath heating.
It has achieved high yield and low impurity particles for ultra-thin palladium nanosheet preparation, which is simple to operate and low cost, and is suitable for electrocatalysis and other fields.
Smart Images
Figure CN119098593A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the synthesis of nano materials, in particular to a method for controlling the wrinkle degree of an ultra-thin palladium nano sheet. Technical Background
[0002] Ultra-thin two-dimensional precious metal nanomaterials have broad application prospects in the fields of sensing, biomedicine, catalysis, etc. due to their unique electronic, catalytic, electrochemical and optical properties. Compared with other similar materials of different dimensions, the atomic-level thickness of ultra-thin nanosheets exposes more internal atoms, giving them an ultra-large specific surface area and thus more active sites. These active sites are conducive to rapid surface reactant diffusion and interfacial charge transfer, thus giving them excellent catalytic properties. Among transition metals, palladium has good compatibility and small lattice mismatch, and its reserves are relatively abundant compared to metals such as platinum, making it a good candidate metal.
[0003] However, the palladium nanosheets synthesized by general methods are very wrinkled, which makes the palladium sheets wrinkled together and thicker, and the active sites in the overlapping parts are inactivated. Therefore, it is crucial to synthesize flat ultra-thin sheets. Summary of the invention
[0004] The object of the present invention is to provide a method for controlling the wrinkle degree of ultra-thin palladium nanosheets. The present invention synthesizes palladium nanosheets with different wrinkle degrees by regulating the type of halogen reagent, the amount of halogen reagent, the reaction time, the reaction temperature, the type of amino ligand, the concentration of potassium hydroxide and the concentration of sodium chloropalladate through a solvothermal method. The method for controlling the wrinkle degree of palladium nanosheets in the present invention has the advantages of high yield of ultra-thin palladium nanosheets, few impurity particles, common reagents used, simple operation, low cost, easy reaction control, simple process and flow, no need for large-scale instruments and equipment, and mild reaction conditions, and has broad application prospects in the fields of electrocatalysis and the like.
[0005] In order to solve the technical problem of the present invention, a technical solution is proposed: a method for controlling the wrinkle degree of ultra-thin palladium nanosheets, comprising the following steps:
[0006] (1) a ternary solution system consisting of 28 wt% ethylene glycol, 36 wt% N,N-dimethylformamide and 30 wt% diethylenetriamine is prepared in a reaction container, 6 wt% potassium hydroxide is weighed, and the potassium hydroxide is placed in the mixed solution for ultrasonic dispersion to obtain a uniform solution A;
[0007] (2) 0.16182 mol / L sodium chloropalladate and different concentrations of different types of halogen reagents sodium iodide or sodium bromide were placed in solution A, manually shaken until no flocs were visible, and heated in an oil bath;
[0008] (3) After the reaction is completed, the mixture is naturally cooled to room temperature, and the obtained product is washed four times with anhydrous ethanol and deionized water alternately, and dispersed in anhydrous ethanol.
[0009] Preferably, the method comprises the following steps:
[0010] (1) a ternary solution system consisting of 28 wt% ethylene glycol, 36 wt% N,N-dimethylformamide and 30 wt% diethylenetriamine is prepared in a reaction container, 6 wt% potassium hydroxide is weighed and placed in the mixed solution for ultrasonic dispersion to obtain a uniform solution A;
[0011] (2) 0.16182 mol / L 0.004 wt% sodium chloropalladate and 0.3 wt% sodium bromide were placed in solution A, and the mixture was manually shaken until no flocs were visible. The mixture was then heated in an oil bath at 100°C for 10 min.
[0012] (3) After the reaction was completed, the mixture was naturally cooled to room temperature and centrifuged at 8000 rpm for 10 min. The obtained product was washed four times with anhydrous ethanol and deionized water alternately and dispersed in anhydrous ethanol.
[0013] Preferably, in step (2), the concentration of the halogen reagent can be adjusted to obtain palladium nanosheets with different degrees of wrinkling.
[0014] Preferably, in step (2), palladium nanosheets with different degrees of wrinkling can be obtained by changing the type of halogen reagent.
[0015] Preferably, in step (2), the heating time can be adjusted to obtain palladium nanosheets with different degrees of wrinkling.
[0016] Preferably, in step (2), the heating temperature can be adjusted to obtain palladium nanosheets with different degrees of wrinkling.
[0017] Preferably, in step (1), palladium nanosheets with different degrees of wrinkling can be obtained by changing the type of amino ligand.
[0018] Preferably, in step (1), the concentration of potassium hydroxide can be adjusted to obtain palladium nanosheets with different degrees of wrinkling.
[0019] Preferably, in step (2), the concentration of sodium chloropalladate can be adjusted to obtain palladium nanosheets with different degrees of wrinkling.
[0020] Preferably, 1 g of potassium hydroxide is weighed and placed in a mixed solution consisting of 4 mL of ethylene glycol, 6 mL of N,N-dimethylformamide and 5 mL of diethylenetriamine and ultrasonically dispersed to obtain a uniform solution, 30 μL of 0.16182 mol / L sodium chloropalladate and 100 μL of 0.5 g / mL NaBr are placed in the mixed solution, and manually shaken until no flocs are visible, the mixed solution is placed in a 100° C. oil bath and heated for 10 min. After the reaction is completed, the product is naturally cooled to room temperature and centrifuged at 8000 rpm for 10 min, washed four times alternately with anhydrous ethanol and deionized water, and dispersed in anhydrous ethanol to prepare flat palladium nanosheets.
[0021] A method for controlling the wrinkle degree of an ultrathin palladium nanosheet comprises the following steps:
[0022] (1) a ternary solution system consisting of 28 wt% ethylene glycol, 36 wt% N,N-dimethylformamide and 30 wt% diethylenetriamine is prepared in a reaction container, 6 wt% potassium hydroxide is weighed and placed in the mixed solution for ultrasonic dispersion to obtain a uniform solution A;
[0023] (2) 0.16182 mol / L 0.004 wt% sodium chloropalladate and 0.3 wt% halogen reagent were placed in solution A, manually shaken until no flocs were visible, and heated in an oil bath (preferably at a heating temperature of 100-150° C. and a heating time of 10-120 min); palladium nanosheets with different degrees of wrinkling can be obtained by adjusting the amount of halogen reagent added, the type of halogen reagent, the heating temperature, the heating time, the amount of potassium hydroxide added, the type of amino ligand, and the concentration of sodium chloropalladate;
[0024] (3) After the reaction was completed, the mixture was naturally cooled to room temperature and centrifuged at 8000 rpm for 10 min. The obtained product was washed four times with anhydrous ethanol and deionized water alternately and dispersed in anhydrous ethanol.
[0025] Beneficial effects:
[0026] Potassium hydroxide can induce the decomposition of N,N-dimethylformamide to produce another amino ligand, dimethylamine (DMA), which plays a role in controlling the crystal surface in the system. 2+ Chelation forms a complex and changes the redox potential of the palladium precursor, which can significantly reduce the metal reduction rate, which can suppress the excessive reduction and random nucleation of palladium nanoparticles and allow selective growth into nanosheets. Sodium bromide is a common surfactant, in which Br -It can effectively cover the metal ions, thereby further slowing down the reduction of palladium monomers, and has a special effect on stabilizing precious metal ions. The present invention uses sodium chloropalladate as a raw material, potassium hydroxide, N,N-dimethylformamide, ethylene glycol and diethylenetriamine mixed solution as a reaction system, and uses an oil bath method to prepare palladium nanosheets. In this system, the synthesis of palladium nanosheets with different wrinkle degrees is achieved by changing the concentration of sodium bromide, the type of halogen ions, the reaction time and the reaction temperature.
[0027] Compared with the prior art, the present invention studies the influence of halogen ions on the reduction rate of palladium nanosheets, and mainly synthesizes palladium nanosheets with different wrinkle degrees by adjusting the type of halogen reagent, the amount of halogen reagent, the reaction time, the reaction temperature, the type of amino ligand and the concentration of potassium hydroxide through a solvothermal method. The method for controlling the wrinkle degree of palladium nanosheets in the present invention has the advantages of high yield of ultra-thin palladium nanosheets, less impurity particles, common reagents used, simple operation, low cost, easy reaction control, simple process and flow, no need for large-scale instruments and equipment, mild reaction conditions, and broad application prospects in the fields of electrocatalysis.
[0028] like Figure 1 , is a SEM photo of the palladium nanosheets prepared without adding any halogen reagents and heated at 100°C for 10 minutes. The product was analyzed by scanning electron microscopy, and it was found that the palladium nanosheets had a very high degree of wrinkles.
[0029] like Figure 2 , which are SEM images of palladium nanosheets prepared by adding 100 μL of (a) 0.1 g / mL and (b) 0.5 g / mL NaBr and heating at 100°C for 10 min. The product was analyzed by scanning electron microscopy, and it can be seen that sodium bromide has the effect of flattening the palladium nanosheets, and the higher the sodium bromide concentration, the flatter the palladium sheet.
[0030] like Figure 3 , which is a SEM photo of palladium nanosheets prepared by heating at 100°C for 10 min after adding 100 μL of (a) 0.1 g / mL sodium iodide and (b) 0.1 g / mL sodium chloride. The product was analyzed by scanning electron microscopy, and sodium iodide and sodium bromide both have the effect of flattening the palladium sheet, and the flatness of the palladium sheet is similar to that of the sample with sodium bromide added; while sodium chloride has no such effect, and the palladium sheet is still very wrinkled.
[0031] like Figure 4 , are SEM images of palladium nanosheets prepared by heating at 100°C for (a) 40 min (b) 120 min. The product was analyzed by scanning electron microscopy, and it can be seen that the longer the heating time, the more wrinkled the palladium nanosheets.
[0032] like Figure 5, is a SEM photo of the palladium nanosheets prepared by heating at 130°C for 10 min. The product was analyzed by scanning electron microscopy, and it can be seen that the palladium nanosheets become wrinkled as the temperature rises.
[0033] like Figure 6 , which is a SEM photo of the palladium nanosheets prepared by adding 5mL (a) 1,4-butanediamine (b) tris(2-aminoethyl)amine (c) triethylenetetramine (d) 1,4-cyclohexanediamine (e) oleylamine (f) disodium ethylenediaminetetraacetic acid and heating at 100°C for 10 minutes. The product was analyzed by scanning electron microscopy, and it can be seen that when the amino ligand diethylenetriamine is replaced with tris(2-aminoethyl)amine or triethylenetetramine, the palladium nanosheets have a similar flattening effect; but when diethylenetriamine is replaced with 1,4-butanediamine, 1,4-cyclohexanediamine, oleylamine, and disodium ethylenediaminetetraacetic acid, the palladium sheet becomes more wrinkled.
[0034] like Figure 7 , are SEM images of palladium nanosheets prepared by heating at 100°C for 10 min after adding (a) 0.2g (b) 0.6g potassium hydroxide. The product was analyzed by scanning electron microscopy, and the wrinkling degree of the palladium sheet increased when less potassium hydroxide was added.
[0035] like Figure 8 , which is a SEM photo of the palladium nanosheets prepared by adding 30μL 0.5394mol / L sodium chloropalladate and heating at 100℃ for 10min. The product was analyzed by scanning electron microscopy, and the palladium nanosheets became more wrinkled when excessive sodium chloropalladate was added. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] Figure 1 This is a SEM picture of the palladium nanosheet prepared by heating at 100° C. for 10 min without adding any halogen reagent in the present invention.
[0037] Figure 2 The SEM images of palladium nanosheets prepared in the present invention are obtained by adding 100 μL of (a) 0.1 g / mL and (b) 0.5 g / mL sodium bromide and heating at 100° C. for 10 min.
[0038] Figure 3 This is a SEM photograph of the palladium nanosheet prepared by adding 100 μL of (a) 0.1 g / mL sodium iodide and (b) 0.1 g / mL sodium chloride and heating at 100° C. for 10 min in the present invention.
[0039] Figure 4 These are SEM photos of palladium nanosheets prepared at a temperature of 100° C. for (a) 40 min and (b) 120 min in the present invention.
[0040] Figure 5This is a SEM image of the palladium nanosheet prepared by heating at 130° C. for 10 min in the present invention.
[0041] Figure 6 This is a SEM picture of the palladium nanosheet prepared when 5 mL of (a) 1,4-butanediamine (b) tri(2-aminoethyl)amine (c) triethylenetetramine (d) 1,4-cyclohexanediamine (e) oleylamine (f) disodium ethylenediaminetetraacetate is added in the present invention.
[0042] Figure 7 These are SEM photos of palladium nanosheets prepared when (a) 0.2 g and (b) 0.6 g potassium hydroxide are added in the present invention.
[0043] Figure 8 This is a SEM picture of the palladium nanosheets prepared when 30 μL of 0.5394 mol / L sodium chloropalladate is added in the present invention. DETAILED DESCRIPTION
[0044] The present invention will be further described below in conjunction with specific implementations and drawings.
[0045] Example 1
[0046] Weigh 1g potassium hydroxide, place it in a mixture of 4mL ethylene glycol, 6mL N,N-dimethylformamide and 5mL diethylenetriamine and disperse it ultrasonically to obtain a uniform solution. Measure 30μL 0.16182mol / L sodium chloropalladate and place it in the mixture, and shake it manually until no flocs are visible. Heat the mixture in a 100℃ oil bath for 10min. After the reaction is completed, cool it naturally to room temperature, centrifuge the product at 8000rpm for 10min, wash it four times with anhydrous ethanol and deionized water alternately, and disperse it in anhydrous ethanol. Figure 1 , is a SEM photo of the palladium nanosheets prepared without adding any halogen reagents and heated at 100°C for 10 minutes. The product was analyzed by scanning electron microscopy, and it was found that the palladium nanosheets had a very high degree of wrinkles.
[0047] Example 2
[0048] Weigh 1g potassium hydroxide, place it in a mixture of 4mL ethylene glycol, 6mL N,N-dimethylformamide and 5mL diethylenetriamine and disperse it ultrasonically to obtain a uniform solution. Measure 30μL 0.16182mol / L sodium chloropalladate and 100μL NaBr of different concentrations and place them in the mixture. Shake it manually until no flocs are visible. Heat the mixture in a 100℃ oil bath for 10min. After the reaction is completed, cool it naturally to room temperature and centrifuge the product at 8000rpm for 10min. Wash it four times with anhydrous ethanol and deionized water alternately and disperse it in anhydrous ethanol. Figure 2, which are SEM images of palladium nanosheets prepared by adding 100 μL of (a) 0.1 g / mL and (b) 0.5 g / mL NaBr and heating at 100°C for 10 min. The product was analyzed by scanning electron microscopy, and it can be seen that sodium bromide has the effect of flattening the palladium nanosheets, and the higher the sodium bromide concentration, the flatter the palladium sheet.
[0049] Example 3
[0050] Weigh 1g potassium hydroxide, place it in a mixture of 4mL ethylene glycol, 6mL N,N-dimethylformamide and 5mL diethylenetriamine and disperse it ultrasonically to obtain a uniform solution. Measure 30μL 0.16182mol / L sodium chloropalladate and different types of halogen reagents and place them in the mixture. Shake them manually until no flocs are visible. Heat the mixture in a 100℃ oil bath for 10min. After the reaction is completed, cool it naturally to room temperature and centrifuge the product at 8000rpm for 10min. Wash it four times with anhydrous ethanol and deionized water alternately and disperse it in anhydrous ethanol. Figure 3 , which is a SEM photo of palladium nanosheets prepared by heating at 100°C for 10 min after adding 100 μL of (a) 0.1 g / mL sodium iodide and (b) 0.1 g / mL sodium chloride. The product was analyzed by scanning electron microscopy, and sodium iodide and sodium bromide both have the effect of flattening the palladium sheet, and the flatness of the palladium sheet is similar to that of the sample with sodium bromide added; while sodium chloride has no such effect, and the palladium sheet is still very wrinkled.
[0051] Example 4
[0052] Weigh 1g potassium hydroxide, place it in a mixture of 4mL ethylene glycol, 6mL N,N-dimethylformamide and 5mL diethylenetriamine and disperse it ultrasonically to obtain a uniform solution. Measure 30μL 0.16182mol / L sodium chloropalladate and 100μL 0.5g / mL NaBr and place them in the mixture. Shake it manually until no flocs are visible. Heat the mixture in a 100℃ oil bath for different times. After the reaction is completed, cool it naturally to room temperature, centrifuge the product at 8000rpm for 10min, wash it four times with anhydrous ethanol and deionized water alternately, and disperse it in anhydrous ethanol. Figure 4 , are SEM images of palladium nanosheets prepared by heating at 100°C for (a) 40 min (b) 120 min. The product was analyzed by scanning electron microscopy, and it can be seen that the longer the heating time, the more wrinkled the palladium nanosheets.
[0053] Example 5
[0054] Weigh 1g potassium hydroxide, place it in a mixture of 4mL ethylene glycol, 6mL N,N-dimethylformamide and 5mL diethylenetriamine and disperse it ultrasonically to obtain a uniform solution. Measure 30μL 0.16182mol / L sodium chloropalladate and 100μL 0.5g / mL NaBr and place them in the mixture. Shake it manually until no flocs are visible. Heat the mixture in a 130℃ oil bath for 10min. After the reaction is completed, cool it naturally to room temperature, centrifuge the product at 8000rpm for 10min, wash it four times with anhydrous ethanol and deionized water alternately, and disperse it in anhydrous ethanol. Figure 5 , is a SEM photo of the palladium nanosheets prepared by heating at 130°C for 10 min. The product was analyzed by scanning electron microscopy, and it can be seen that the palladium nanosheets become wrinkled as the temperature rises.
[0055] Example 6
[0056] Weigh 1g potassium hydroxide, place it in a mixture consisting of 4mL ethylene glycol, 6mL N,N-dimethylformamide and 5mL of different types of amino ligands and disperse it ultrasonically to obtain a uniform solution. Measure 30μL 0.16182mol / L sodium chloropalladate and 100μL 0.5g / mL NaBr and place them in the mixture. Shake it manually until no flocs are visible. Heat the mixture in a 100℃ oil bath for 10min. After the reaction is completed, cool it naturally to room temperature, centrifuge the product at 8000rpm for 10min, wash it four times with anhydrous ethanol and deionized water alternately, and disperse it in anhydrous ethanol. Figure 6 , which is a SEM photo of the palladium nanosheets prepared by adding 5mL (a) 1,4-butanediamine (b) tris(2-aminoethyl)amine (c) triethylenetetramine (d) 1,4-cyclohexanediamine (e) oleylamine (f) disodium ethylenediaminetetraacetic acid and heating at 100°C for 10 minutes. The product was analyzed by scanning electron microscopy, and it can be seen that when the amino ligand diethylenetriamine is replaced with tris(2-aminoethyl)amine or triethylenetetramine, the palladium nanosheets have a similar flattening effect; but when diethylenetriamine is replaced with 1,4-butanediamine, 1,4-cyclohexanediamine, oleylamine, and disodium ethylenediaminetetraacetic acid, the palladium sheet becomes more wrinkled.
[0057] Example 7
[0058] Weigh different amounts of potassium hydroxide, place it in a mixture consisting of 4mL ethylene glycol, 6mL N,N-dimethylformamide and 5mL diethylenetriamine and disperse it ultrasonically to obtain a uniform solution. Measure 30μL 0.16182mol / L sodium chloropalladate and 100μL 0.5g / mL NaBr and place them in the mixture. Shake it manually until no flocs are visible. Heat the mixture in a 100℃ oil bath for 10min. After the reaction is completed, cool it naturally to room temperature, centrifuge the product at 8000rpm for 10min, wash it four times with anhydrous ethanol and deionized water alternately, and disperse it in anhydrous ethanol. Figure 7 , are SEM images of palladium nanosheets prepared by heating at 100°C for 10 min after adding (a) 0.2g (b) 0.6g potassium hydroxide. The product was analyzed by scanning electron microscopy, and the wrinkling degree of the palladium sheet increased when less potassium hydroxide was added.
[0059] Example 8
[0060] Weigh 1g potassium hydroxide, place it in a mixture of 4mL ethylene glycol, 6mL N,N-dimethylformamide and 5mL diethylenetriamine and disperse it ultrasonically to obtain a uniform solution. Measure 30μL of sodium chloropalladate of different concentrations and 100μL 0.5g / mL NaBr and place them in the mixture. Shake it manually until no flocs are visible. Heat the mixture in a 100℃ oil bath for 10min. After the reaction is completed, cool it naturally to room temperature and centrifuge the product at 8000rpm for 10min. Wash it four times with anhydrous ethanol and deionized water alternately and disperse it in anhydrous ethanol. Figure 8 , which is a SEM photo of the palladium nanosheets prepared by adding 30μL 0.5394mol / L sodium chloropalladate and heating at 100℃ for 10min. The product was analyzed by scanning electron microscopy, and the palladium nanosheets became more wrinkled when excessive sodium chloropalladate was added.
Claims
1. A method for controlling the wrinkle degree of ultrathin palladium nanosheets, characterized in that : Includes the following steps: (1) a ternary solution system consisting of 28 wt% ethylene glycol, 36 wt% N,N-dimethylformamide and 30 wt% diethylenetriamine is prepared in a reaction container, 6 wt% potassium hydroxide is weighed and placed in the mixed solution for ultrasonic dispersion to obtain a uniform solution A; (2) 0.16182 mol / L sodium chloropalladate and different concentrations of different types of halogen reagents sodium iodide or sodium bromide were placed in solution A, manually shaken until no flocs were visible, and heated in an oil bath; (3) After the reaction is completed, the mixture is naturally cooled to room temperature, and the obtained product is washed four times with anhydrous ethanol and deionized water alternately, and dispersed in anhydrous ethanol.
2. The method for controlling the wrinkle degree of ultra-thin palladium nanosheets according to claim 1, characterized in that : Includes the following steps: (1) a ternary solution system consisting of 28 wt% ethylene glycol, 36 wt% N,N-dimethylformamide and 30 wt% diethylenetriamine is prepared in a reaction container, 6 wt% potassium hydroxide is weighed and placed in the mixed solution for ultrasonic dispersion to obtain a uniform solution A; (2) 0.16182 mol / L 0.004 wt% sodium chloropalladate and 0.3 wt% sodium bromide were placed in solution A, and the mixture was manually shaken until no flocs were visible. The mixture was then heated in an oil bath at 100°C for 10 min. (3) After the reaction was completed, the mixture was naturally cooled to room temperature and centrifuged at 8000 rpm for 10 min. The obtained product was washed four times with anhydrous ethanol and deionized water alternately and dispersed in anhydrous ethanol.
3. The method for controlling the wrinkle degree of ultra-thin palladium nanosheets according to claim 1, characterized in that : In step (2), the concentration of the halogen reagent can be adjusted to obtain palladium nanosheets with different degrees of wrinkling.
4. The method for controlling the wrinkle degree of ultra-thin palladium nanosheets according to claim 1, characterized in that : In step (2), palladium nanosheets with different degrees of wrinkling can be obtained by changing the type of halogen reagent.
5. The method for controlling the wrinkle degree of ultra-thin palladium nanosheets according to claim 1, characterized in that : In step (2), palladium nanosheets with different degrees of wrinkling can be obtained by adjusting the heating time.
6. The method for controlling the wrinkle degree of ultra-thin palladium nanosheets according to claim 1, characterized in that : In step (2), palladium nanosheets with different degrees of wrinkling can be obtained by adjusting the heating temperature.
7. The method for controlling the wrinkle degree of ultrathin palladium nanosheets according to claim 1, characterized in that : In step (1), palladium nanosheets with different degrees of wrinkling can be obtained by changing the type of amino ligand.
8. The method for controlling the wrinkle degree of ultra-thin palladium nanosheets according to claim 1, characterized in that In step (1), the concentration of potassium hydroxide can be adjusted to obtain palladium nanosheets with different degrees of wrinkling.
9. The method for controlling the wrinkle degree of ultra-thin palladium nanosheets according to claim 1, characterized in that : In step (2), the concentration of sodium chloropalladate can be adjusted to obtain palladium nanosheets with different degrees of wrinkling.
10. The method for controlling the wrinkle degree of ultra-thin palladium nanosheets according to claim 2, characterized in that : Weigh 1g of potassium hydroxide, place it in a mixed solution consisting of 4mL of ethylene glycol, 6mL of N,N-dimethylformamide and 5mL of diethylenetriamine and ultrasonically disperse it to obtain a uniform solution, measure 30μL of 0.16182mol / L sodium chloropalladate and 100μL of 0.5g / mL NaBr and place them in the mixed solution, and shake it manually until no flocs are visible, place the mixed solution in a 100℃ oil bath and heat it for 10min. After the reaction is completed, naturally cool to room temperature, centrifuge the product at 8000rpm for 10min, wash it four times alternately with anhydrous ethanol and deionized water, and disperse it in anhydrous ethanol to prepare flat palladium nanosheets.