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A method for synthesizing silver nanoclusters using single-stranded DNA as a template

A technology of silver nanoclusters and single chains, which is applied in the field of nanomaterials, can solve the problems of high cost and inconvenient preparation of silver nanoclusters, and achieve the effects of low cost, excellent selectivity and sensitivity

Inactive Publication Date: 2016-05-18
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is to detect Hg in the prior art 2+ Due to the inconvenient preparation and high cost of silver nanoclusters, a method for synthesizing silver nanoclusters using single-stranded DNA as a template is proposed, which has the advantages of simplicity, low cost, green and reliable

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Embodiment 1

[0027] In this example, fluorescent silver nanoclusters were synthesized using polyinosinic acid (PI) as a template. The synthesis method is as follows: take 0.2mL 2.0%PI and 100μL 10mmolL respectively -1 AgNO3, added to 10mL buffer solution composed of ammonium acetate and acetic acid (0.09molL -1 , pH=4.0). After mixing the solution, let it wait at 0°C for 15 minutes, and then add 20 μL of newly prepared 0.1 mmolL dropwise to the mixed solution under stirring conditions. -1 Sodium borohydride solution. After another 15 minutes of reaction, the resulting mixed solution was placed in a dark place at room temperature for 8 hours for use. During the reaction process, as the amount of reducing agent increases, the color deepens, and the solution changes from light color to brown. As the reaction progresses, the newly generated Ag particles are large. As time increases, due to Ostwald's law of maturation , the particles become smaller, thereby forming yellow nanoclusters.

Embodiment 2

[0029] In this example, fluorescent silver nanoclusters were synthesized using polycytidylic acid (PC) as a template.

[0030] The synthesis method is as follows: take 0.5mL5.0%PI and 200μL12mmolL respectively -1 AgNO3, added to 25mL buffer solution composed of ammonium acetate and acetic acid (0.08molL -1 , pH=5.0). After mixing the solution, let it wait at 0°C for 15 minutes, and then add 50 μL of newly prepared 0.1 mmolL dropwise to the mixed solution under stirring conditions. -1 Sodium borohydride solution. After another 15 minutes of reaction, the resulting mixed solution was placed in a dark place at room temperature for 8 hours for use. During the reaction process, as the amount of reducing agent increases, the color deepens, and the solution changes from light color to brown. As the reaction progresses, the newly generated Ag particles are large. As time increases, due to Ostwald's law of maturation , the particles become smaller, thereby forming yellow nanocluste...

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Abstract

The invention provides a method for synthesizing silver nanoclusters by the aid of single-stranded DNA (deoxyribonucleic acid) used as a template, and belongs to the technical field of nano materials. By the method, problems of complicated production and excessively high cost of nano-silver for detecting mercury ions at present are solved. The method for synthesizing the silver nanoclusters by the aid of the single-stranded DNA used as the template is characterized in that the single-stranded DNA containing cytosine and guanine is used as the template and is mixed with Ag<+> solution to obtain a mixture, reducing agents are added into the mixture, and the fluorescent silver nanoclusters can be acquired after reduction reaction is performed on the mixture with the reducing agents. The method has the advantages that polyinosinic acid (PI) and polycytidylic acid (PC) which are commercially available are used as the template in the simple, low-cost, environment-friendly and reliable method for synthesizing the silver nanoclusters; fluorescence is utilized, and fluorescent silver nanocrystals are synthesized from the polyinosinic acid, the polycytidylic acid and the like without special design or preprocessing; and the novel silver nanoclusters are excellent in selectivity and sensitivity, can be applied to detecting Hg<2+>, and are feasible and have a future development prospect in the aspect of monitoring pollutants in water.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, relates to a silver nanocluster, in particular to a method for synthesizing a silver nanocluster using single-stranded DNA as a template. Background technique [0002] Environmental problems are one of the most concerned topics in the new century, and water pollution is an important problem that needs to be solved urgently. The most water pollution is the hazard of heavy metals. Heavy metal mercury exists in the form of inorganic mercury or organic mercury in nature. Through the accumulation of biological chains, mercury metal can be enriched in organisms. The damage of mercury and its compounds to the human body is related to the amount of mercury entering the body. The harm of mercury to the human body mainly involves the central nervous system, digestive system and kidneys, and also has certain effects on the respiratory system, skin, blood and eyes. The United States and Europe requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24G01N21/64
Inventor 冯九菊周丹玲奚焕祥蔡琳熠王爱军
Owner ZHEJIANG NORMAL UNIVERSITY
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