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A kind of preparation method of concave silver nanoparticles with high index crystal plane
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A technology of silver nanoparticles and high-index crystal planes is applied in the field of preparation of concave silver nanoparticles, which can solve the problems of high surface chemical energy and few fingers, and achieve a simple preparation process, controllable concave curvature and high repeatability. Effect
Inactive Publication Date: 2016-06-29
EAST CHINA NORMAL UNIV
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However, theory and experiments have proved that concave silver nanoparticles with high-index crystal planes have high surfacechemical energy and are not thermodynamically stable nanomaterials. Therefore, concave silver nanoparticles with high-index crystal planes can only be synthesized under special synthesis conditions.
There are still only a handful of methods reported for the preparation of concave silver nanoparticles with high-index crystal faces
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Embodiment 1
[0023] Embodiment 1, the preparation of the concave silver nanoparticles of the high index crystal face of the present invention
[0024] Include the following steps:
[0025] 1. Polyvinylpyrrolidone (average molecular weight is 29000Da) is dissolved in ethanol, and preparation obtains the ethanol solution of 1 mmol / L (in average molecular weight) polyvinylpyrrolidone;
[0026] 2. Add 10 milliliters of prepared polyvinylpyrrolidone ethanol solution to a 25 milliliter polytetrafluoroethylene high-temperature reactor;
[0027] 3. The preparation concentration is 2.2×10 13 Particle / liter of silver nanoparticle ethanol suspension, 0.3 milliliters of this silver nanocube ethanol suspension is added in the above-mentioned polytetrafluoroethylene high-temperature reaction kettle;
[0028] 4. Tighten the seal of the reaction kettle, and then place it in a constant temperature oven at 80°C for 6 hours;
[0029] 5. When the reaction time is over, put the reaction kettle in the water ...
Embodiment 2
[0032] Embodiment 2 Preparation of concave silver nanocubes with different high-index crystal planes with different concave curvatures
[0033] Refer to Example 1 for other implementation conditions and steps. In the above-described embodiment, the reaction time is stopped at 1, 2, 4, and 6 hours, and the concave silver nanocubes of the high-index crystal faces of different concave surface curvatures can be obtained, such as figure 2 shown. Among them, Figures A, B, C, and D represent concave silver nanocubes with high-index crystal faces of different concave curvatures obtained after the reaction is stopped for 1, 2, 4, and 6 hours, respectively.
Embodiment 3
[0034] The preparation of the concave silver nanocube of embodiment 3 high index crystal face
[0035] Refer to Example 1 for other implementation conditions and steps. In the above example, the reaction temperature is increased to 160°C, and the concave silver nanocube with high indexcrystal plane can be obtained after reacting for 1-2 hours. This method can shorten the reaction time by increasing the reaction temperature, and can also obtain high-quality concave silver. nanocube.
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Abstract
The invention discloses a manufacturing method of concave silver nanoparticles with a high-index crystal face. The method comprises the steps of respectively preparing a polyvinylpyrrolidoneethanol solution and a silver nanoparticleethanol suspension liquid; adding the prepared polyvinylpyrrolidoneethanol solution and the silver nanoparticle ethanol suspension liquid into a polytetrafluoroethylene high temperature reactor; reacting for a certain time under sealing and constant temperature conditions; cooling the reactants fast and centrifuging the reactants to obtain sediments which are the concave silver nanoparticles with the high-index crystal face. The manufacturing method is simple and high in repeatability, can be used for manufacturing various shapes of the concave silver nanoparticles with the high-index crystal face, and can be used for large-scale production. The concave silver nanoparticles with the high-index crystal face manufactured by the method is uniform in size, good in dispersity, controllable in concave curvature and high in yield.
Description
technical field [0001] The invention relates to a method for preparing silver nanoparticles, in particular to a method for preparing concave silver nanoparticles with high-index crystal planes. Background technique [0002] Silver nanomaterials have shown excellent properties in the fields of optics, electronics, catalysis, biodiagnostic markers, antibacterial and anti-inflammatory. Up to now, there have been a large number of methods to accurately synthesize silver nanomaterials with different shapes, sizes and structures. However, most of these silver nanomaterials are convex surface (convexsurface) silver nanoparticles with low index crystal faces. In recent years, the synthesis of concave silver nanoparticles with high-index crystal faces has been proved to be more efficient or special in the fields of optics, catalysis, and electronics than convex silver nanoparticles with low-index crystal faces. However, theory and experiments have proved that concave silver nanopar...
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