High-concentration fast preparation method for silver nanowires

[0035] Example 1:

[0036] A closed 100ml three-necked flask equipped with a condensing reflux device was filled with argon and placed in an oil bath at 180°C; 10ml of ethylene glycol was added and preheated with a magnetic stirrer for 30min; then the molar concentration of 10ml was 0.3M The ethylene glycol solution of silver nitrate was added to the preheated ethylene glycol solution, and the addition rate was controlled to 50ml/min. At the same time, 10ml of polyvinylpyrrolidone glycol solution with a molar concentration of 0.3M was added. The alcohol solution contains copper chloride with a molar concentration of 0.05 mM, and the addition rate is controlled to be 1 ml/min; the reaction time is 15 minutes; the mother liquor of silver nanowires is obtained by cooling to room temperature; after the reactants are naturally cooled, the mother liquor of silver nanowires is transferred to Three 50ml centrifuge tubes, add a solution of 10:1 volume ratio of acetone to ethanol; ultrasonic for 1min to mix well, centrifuge at 3000rpm for 20min, remove the supernatant; repeat once; add ethanol and deionized water to the obtained precipitate The volume ratio of the solution is 10:1, ultrasonic for 1min to disperse uniformly; centrifuge at 3000rpm for 30min and then remove the supernatant; repeat twice; add 10ml ethanol to the precipitate, ultrasonically disperse evenly, and store. figure 1 Is a scanning electron microscope (SEM) photograph of the silver nanowires obtained in this example; figure 2 This is the X-diffraction pattern of the silver nanowire obtained in this example.

[0037] Example 2:

[0038] A closed 100ml three-necked flask equipped with a condensing reflux device was filled with argon and placed in an oil bath at 180°C; 10ml of ethylene glycol was added and preheated with a magnetic stirrer for 30min; then the molar concentration of 10ml was 0.3M The ethylene glycol solution of silver nitrate was added to the preheated ethylene glycol solution, and the addition rate was controlled to 50ml/min. At the same time, 10ml of 0.5M polyvinylpyrrolidone glycol solution with a molar concentration of 0.5M was added. The alcohol solution contains copper chloride with a molar concentration of 0.05 mM, and the addition rate is controlled to 10 ml/min; the reaction time is 30 minutes; the mother liquor of silver nanowires is obtained by cooling to room temperature; after the reactants are naturally cooled, the reaction mother liquor is transferred to 3 Add a 50ml centrifuge tube with a volume ratio of acetone to ethanol of 5:1; sonicate for 1 min to mix well and centrifuge at 3000 rpm for 20 min to remove the supernatant; repeat once; add ethanol and deionized water to the resulting precipitate For a solution with a ratio of 5:1, ultrasonically disperse uniformly for 1 min; centrifuge at 3000 rpm for 30 minutes and then remove the supernatant; repeat twice; add 10 ml of ethanol to the precipitate, ultrasonically disperse, and store. image 3 It is a scanning electron microscope (SEM) photograph of the silver nanowires obtained in this example.

[0039] Example 3:

[0040] A closed 100ml three-necked flask equipped with a condensing reflux device was filled with argon and placed in an oil bath at 180°C; 10ml of ethylene glycol was added and preheated with a magnetic stirrer for 30min; then the molar concentration of 10ml was 0.3M The ethylene glycol solution of silver nitrate was added to the preheated ethylene glycol solution, and the addition rate was controlled to 50ml/min; at the same time, 10ml of polyvinylpyrrolidone ethylene glycol solution with a molar concentration of 1.5M was added. The alcohol solution contains copper chloride with a molar concentration of 0.05 mM, and the addition rate is controlled to 5 ml/min; the reaction time is 15 minutes; the mother liquor of silver nanowires is obtained by cooling to room temperature; after the reactants are naturally cooled, the reaction mother liquor is transferred to 3 Add a 50ml centrifuge tube with a solution of 10:1 volume ratio of acetone and ethanol; ultrasonicate for 1min to mix well and centrifuge at 3000rpm for 20min to remove the supernatant; repeat once; add the volume of ethanol and deionized water to the obtained precipitate The solution with a ratio of 5:1 is uniformly dispersed by ultrasonic for 1 min; the supernatant is removed after centrifugation at 3000 rpm for 30 minutes; repeated 3 times; the precipitate is added to 10 ml of ethanol, ultrasonically dispersed, and stored. Figure 4 It is a scanning electron microscope (SEM) photograph of the silver nanowires obtained in this example.