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Silver nanoparticles and preparation method thereof
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A silver nanoparticle, silver nitrate technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve uniform size, easy dispersion, and good dispersibility.
Pending Publication Date: 2022-03-25
江苏纳美达光电科技有限公司
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preparation example Construction
[0024] See figure 1 , the preparation method of the silver nanoparticle of one embodiment of the present invention comprises the following steps:
[0027] In a feasible implementation, the ratio of silver nitrate, dodecanoic acid, polyvinylpyrrolidone and organic solvent is (0.005mol~0.008mol):(0.016mol~0.032mol):(0.15g~0.4g):( 0.8mol~1.2mol).
[0028] In one possible implementation, the organic solvent is ethanol. Silver nitrate, dodecanoic acid and polyvinylpyrrolidone have good solubility in ethanol, and ethanol is easy to get and the cost is...
Embodiment 1
[0042] 0.8mol ethanol, 0.02mol dodecanoic acid, 0.0066mol silver nitrate and 0.21 gram of PVP are added to the reaction vessel, and mixed in the reaction vessel to obtain a mixed solution;
[0043] Place the reaction vessel containing the mixed solution in a pressure-resistant reaction kettle, exhaust the air in the kettle with carbon monoxide; then fill a certain amount of carbon monoxide into the kettle so that the pressure in the kettle reaches 1.0Mpa; slowly raise the temperature while stirring to 90° C., and reacted at this temperature for 2 hours; after that, the pressure in the kettle was released, filtered with acetone, and dried to obtain the silver nanoparticles of Example 1.
[0044] Silver nanoparticles prepared in Example 1 were characterized by transmission electronmicroscope, obtained figure 1 . Depend on figure 1 It can be seen that the silver nanoparticles prepared in Example 1 are uniform in size, with an average size of 4.41 nm, uniform distribution, and ...
Embodiment 2
[0046] 0.8mol ethanol, 0.02mol dodecanoic acid, 0.0066mol silver nitrate and 0.21 gram of PVP are added to the reaction vessel, and mixed in the reaction vessel to obtain a mixed solution;
[0047] Place the reaction vessel containing the mixed solution in a pressure-resistant reaction kettle, exhaust the air in the kettle with carbon monoxide; then fill a certain amount of carbon monoxide into the kettle so that the pressure in the kettle reaches 0.5Mpa; slowly raise the temperature while stirring to 90° C., and react at this temperature for 2 hours; then release the pressure in the kettle, filter with acetone, and dry to obtain the silver nanoparticles of Example 2.
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Abstract
The invention relates to silver nanoparticles and a preparation method thereof. The preparation method of the silver nanoparticles comprises the following steps: uniformly mixing silver nitrate, dodecanoic acid, polyvinylpyrrolidone and an organic solvent to obtain a mixed solution; and the mixed solution is heated to 80-100 DEG C in the atmosphere of reducing gas, the reaction pressure is maintained to be 0.5-3.0 MPa, solid-liquid separation is conducted after full reaction, solids are reserved, and the silver nanoparticles are obtained. Experiments prove that the silver nanoparticles prepared by the preparation method of the silver nanoparticles according to the technical scheme are uniform in size, free of agglomeration, easy to disperse and good in dispersity in an organic solvent. Meanwhile, according to the preparation method of the silver nanoparticles in the technical scheme, reducing gas is introduced to serve as a reducing agent, the reaction does not need to be carried out at the high temperature of 150 DEG C or above, the crosslinking degree of organic coatings on the surfaces of the silver nanoparticles is reduced, and therefore the organic coatings on the surfaces of the silver nanoparticles can be decomposed at the relatively low temperature.
Description
technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a silver nanoparticle and a preparation method thereof. Background technique [0002] Silver nanoparticles have attracted more and more attention due to their excellent electrical and catalytic properties. Due to the high surface energy brought by the nano-size effect, silver nanoparticles are prone to agglomeration in solvents and are difficult to disperse. Therefore, the traditional preparation method of silver nanoparticles is to use less reducing organic reagents as solvents (such as ethanol, saturated fatty acids) to control the nucleation rate of the reaction process and reduce the surface energy of the particles. [0003] However, in the traditional preparation method of silver nanoparticles, even if ethanol is used as a solvent to react with silver carbonate to prepare silver nanoparticles, it is difficult to disperse enough silver nanoparticles in a sol...
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