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Method for restoring silver ammonia solution with ultraviolet light to prepare water-soluble silver nano-clusters

A technology of silver nanoclusters and silver ammonia solution, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that need to be further improved, and achieve the convenience of large-scale synthesis, simple operation, and reaction The effect of the simplicity of the system

Active Publication Date: 2014-12-03
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

At present, there are many methods for synthesizing silver nanoclusters, such as chemical reduction method, photoreduction method, template method, radiation method, ultrasonic method, inverse microemulsion method, etc. These synthesis methods still need to be improved in terms of synthesis efficiency, reproducibility, and stability. Further improve

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  • Method for restoring silver ammonia solution with ultraviolet light to prepare water-soluble silver nano-clusters
  • Method for restoring silver ammonia solution with ultraviolet light to prepare water-soluble silver nano-clusters

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with specific experimental examples.

[0015] (1) Preparation of the solution used:

[0016] Weigh 0.8494 g AgNO 3 Prepare AgNO at a concentration of 0.1 M in 50 mL of water 3 Stock solution; weigh 0.4000 g NaOH and dissolve in 50 mL water to prepare a 0.2 M NaOH stock solution; 5% NH 3 ·H 2 O solution was prepared from commercially available 25% NH 3 ·H 2 O diluted 5 to obtain; weighed 0.0860 g carboxymethyl dextran dissolved in 50 mL of water to prepare a concentration of 1.0 × 10 -2 The carboxymethyl dextran stock solution of M was diluted to 5.0×10 -3 M. Take 250 μL AgNO 3 Add the (0.1 M) solution into a 5 mL graduated colorimetric tube, then slowly add 20-625 μL of 0.2 M NaOH solution and shake while adding, if there is precipitation, add NH drop by drop under shaking 3 ·H 2 O (5%) 35-160μL until the precipitate is completely dissolved, and finally add twice distilled water ...

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Abstract

The invention provides a method for restoring a silver ammonia solution with ultraviolet light to prepare water-soluble silver nano-clusters. The method includes: adding an AgNO3 solution to a reaction vessel, slowly adding a NaOH solution to the vessel in oscillation, after sediment is generated, dropwise adding NH3.H2O to the vessel in oscillation till the sediment is fully dissolved, and adding redistilled water to prepare a silver ammonia stock solution with the concentration of 5.0*10<-3>M; dropwise adding carboxymethyl dextran to a weighing bottle, adding the silver ammonia stock solution in stirring, adding secondary water till volume of the solution reaches 5 to 10 times of that of the carboxymethyl dextran, stirring the solution with a magnetic stirrer for 5 to 10 minutes, and placing the solution in an exposure manner at the normal temperature under an ultraviolet lamp prior to stirring while light the solution for 2 to 4 hours. The carboxymethyl dextran is taken as a stabilizer and a reducing agent, and the water-soluble silver nano-clusters can be synthesized from the silver ammonia solution under irradiation of the ultraviolet light.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for synthesizing water-soluble fluorescent silver nanoclusters by reducing silver ammonia solution with carboxymethyl dextran as a stabilizer and reducing agent under ultraviolet light irradiation. Background technique [0002] Noble metal nanoclusters have become one of the hotspots in the field of nanomaterials research in recent years due to their unique optical, electrical and chemical properties due to the quantum size effect and small size effect. Its small size, non-toxicity and photostability make it a new type of fluorescent probe with broad application prospects in chemical detection, biomarking, catalysis and other fields. At present, there are many methods for synthesizing silver nanoclusters, such as chemical reduction method, photoreduction method, template method, radiation method, ultrasonic method, inverse microemulsion method, etc. These syn...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 龙云飞符丽丽李春娟陈述
Owner HUNAN UNIV OF SCI & TECH
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