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Silver nanocluster preparation method with hydrogen serving as reducing agent

A reducing agent and hydrogen technology, applied in the field of synthesis of noble metal nanomaterials, can solve the problems that hinder the application of AgNCs, complex operation process, high cost, etc., and achieve excellent fluorescence characteristics and stability, high fluorescence intensity, and low cost.

Inactive Publication Date: 2015-06-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the current preparation method of AgNCs is to use NaBH in the presence of complex templates. 4 or more complex photochemical reducing agents, which mainly have two problems: 1) template problem: using polyaniline (PANI), polyethanolamine (PEI), polyglycerol-b-polyacrylic acid, etc. The process is complicated and time-consuming; the use of proteins and nucleic acids as soft templates has disadvantages such as high cost
2) The use of reducing agent: most of the reducing agent used in the preparation of AgNCs is NaBH 4 , the reducing agent has disadvantages such as poor stability and complicated operation process
These disadvantages hinder the application of AgNCs

Method used

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  • Silver nanocluster preparation method with hydrogen serving as reducing agent
  • Silver nanocluster preparation method with hydrogen serving as reducing agent

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Embodiment 1

[0024] In this embodiment, using polyacrylic acid as a template and hydrogen as a reducing agent, the polyacrylic acid and silver nitrate were reacted at 25° C. for 5 to 40 minutes under the hydrogen atmosphere, thereby obtaining silver clusters with near-infrared emission; Wherein, the molar ratio of silver ions in the silver nitrate to the polyacrylic acid monomer is 1:6. The specific steps are described below.

[0025] Use a pipette to accurately pipette 5ml of deionized water into a 10ml beaker, and add 6μl of freshly prepared 0.5 mol / l PAA solution and 1μl of 0.5 mol / l AgNO with a pipette gun while stirring 3 solution to obtain a mixed solution, after calculation: Ag in the mixed solution + The concentration is 0.1mmol / l, Ag + The molar ratio to PAA monomer is 1:6. The mixed solution was stirred under dark conditions for 10 minutes, then it was transferred to a 50ml autoclave, and filled with 1.5bar high-purity H 2 , and stirred at 25°C for 5-40 minutes. Finally, the...

Embodiment 2

[0028] In this embodiment, using polyacrylic acid as a template and hydrogen as a reducing agent, the polyacrylic acid and silver nitrate were reacted at 25° C. for 5 to 40 minutes under the hydrogen atmosphere, thereby obtaining silver clusters with near-infrared emission; Wherein, the molar ratio of silver ions in the silver nitrate to the polyacrylic acid monomer is 1:6. The specific steps are described below.

[0029] Use a pipette to accurately pipette 5ml of deionized water into a 10ml beaker, add 90μl of freshly prepared 0.5mol / l PAA solution, 15μl of 0.5mol / l AgNO 3 solution to obtain a mixed solution, after calculation: Ag in the mixed solution + Concentration of 1.5mmol / l, Ag + The molar ratio to PAA monomer is 1:6. The mixed solution was stirred under dark conditions for 10 minutes, then it was transferred to a 50ml autoclave, and filled with 1.5bar high-purity H 2 , and stirred at 25°C for 5-40 minutes. Finally, the prepared AgNCs solution was stored in a refr...

Embodiment 3

[0032]In this embodiment, using polyacrylic acid as a template and hydrogen as a reducing agent, the polyacrylic acid and silver nitrate were reacted at 25° C. for 5 to 40 minutes under the hydrogen atmosphere, thereby obtaining silver clusters with near-infrared emission; Wherein, the molar ratio of silver ions in the silver nitrate to the polyacrylic acid monomer is 1:6. The specific steps are described below.

[0033] Use a pipette to accurately pipette 5ml of deionized water into a 10ml beaker, and add 240μl of freshly prepared 0.5 mmol / l PAA solution and 40μl of 0.5 mmol / l AgNO 3 solution to obtain a mixed solution, after calculation: Ag in the mixed solution + The concentration is 3.8mmol / l, Ag + The molar ratio to PAA monomer is 1:6. The mixed solution was stirred under dark conditions for 10 minutes, then it was transferred to a 50ml autoclave, and filled with 1.5bar high-purity H 2 , and stirred at 25°C for 5-40 minutes. Finally, the prepared AgNCs solution was s...

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Abstract

The invention provides a silver nanocluster preparation method with hydrogen serving as a reducing agent. The silver nanocluster preparation method is characterized in that polyelectrolyte and silver salt react at a room temperature in a hydrogen atmosphere by taking the polyelectrolyte as a template and the hydrogen as the reducing agent so as to obtain a near-infrared emission silver nanocluster. The silver nanocluster preparation method has the advantages of low cost, simplicity, mild reacting conditions, no participation of highly-toxic substance and more economy and environmental protection, and the prepared silver nanocluster is excellent in fluorescence characteristic and stability.

Description

technical field [0001] The invention relates to the field of synthesis of noble metal nanometer materials, in particular to a method for preparing silver clusters with light-to-fluorescence emission by using hydrogen as a reducing agent. Background technique [0002] Silver nanoclusters (AgNCs) are fluorescent, water-soluble molecular-level aggregates composed of several to dozens of silver atoms. Its unique quantum size effect makes its optical properties vary with particle size, which makes its fluorescence emission spectrum tunable in the range from visible light to near-infrared light. In addition, AgNCs are characterized by good biocompatibility, strong photostability, strong anti-aggregation ability, large Stokes shift and no flickering on all relevant time scales, which greatly improved their performance as biomarkers, significantly Increased sensitivity of existing analytical methods. Therefore, AgNCs are becoming a new favorite in the field of bioanalysis. At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
Inventor 安学勤陆亮
Owner EAST CHINA UNIV OF SCI & TECH
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