A method for preparing water-soluble silver nanoclusters by reducing silver-ammonia solution with ultraviolet light

A silver ammonia solution, silver nanocluster technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems that need to be further improved, and achieve convenient large-scale synthesis, simple operation, and reaction. Simple system effect

Active Publication Date: 2016-06-22
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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  • A method for preparing water-soluble silver nanoclusters by reducing silver-ammonia solution with ultraviolet light
  • A method for preparing water-soluble silver nanoclusters by reducing silver-ammonia solution with ultraviolet light

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[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 0.8494gAgNO 3 Prepare AgNO with a concentration of 0.1M in 50mL of water 3 Stock solution; Weigh 0.4000g NaOH and dissolve it in 50mL water to prepare a 0.2M 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; weigh 0.0860g carboxymethyl dextran and dissolve in 50mL 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 (0.1M) solution was added to a 5mL graduated colorimetric tube, then slowly added 20-625μL 0.2M NaOH solution and oscillated while adding, a precipitate was formed, and NH was added drop by drop under oscillating 3 ·H 2 O (5%) 35-160 μL until the precipitate is completely dissolved, and finally add twice distilled wat...

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Abstract

The invention provides a method for preparing water-soluble silver nanoclusters by reducing silver ammonia solution with ultraviolet light, comprising: taking AgNO 3 Add the solution into the reaction vessel, slowly add NaOH solution while shaking, and add NH dropwise under shaking after precipitation is formed. 3 ·H 2 O until the precipitate is completely dissolved, add twice distilled water to make the concentration 5.0×10 - 3 Silver ammonia stock solution of M; add carboxymethyl dextran dropwise into a weighing bottle, add silver ammonia stock solution under stirring, add secondary water until the volume of the solution is 5-10 times the volume of carboxymethyl dextran times, stir with a magnetic stirrer for 5-10min, and place it under a UV lamp at room temperature for 2-4 hours while stirring. The method of the present invention adopts carboxymethyl dextran as a stabilizer and a reducing agent, and irradiates silver ammonia solution with UVC ultraviolet light to synthesize water-soluble silver nanoclusters; the system is simple, the fluorescence is strong, the particle size is relatively uniform, and the stability is very high it is good.

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 Patents(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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