Method for synthesizing fluorescent silver nano-particles under microwave by polymethylacrylic acid

A technology of polymethacrylic acid and sodium polymethacrylate, applied in the field of fluorescent nano silver particles, can solve the problems of tedious and time-consuming operation, and achieve the effects of uniform particle size distribution, good dispersibility and easy realization.

Inactive Publication Date: 2011-05-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The methods usually used to detect copper ions include spectrophotometry and atomic absorption spectrometry, but these methods often need to go through steps such as separation, enrichment, color development, and measurement, and the operation is tedious and time-consuming

Method used

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  • Method for synthesizing fluorescent silver nano-particles under microwave by polymethylacrylic acid
  • Method for synthesizing fluorescent silver nano-particles under microwave by polymethylacrylic acid
  • Method for synthesizing fluorescent silver nano-particles under microwave by polymethylacrylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Measure 4.8mL (0.05M) AgNO with a pipette 3 The aqueous solution is placed in a 20mL beaker, 0.6mL of polymethacrylic acid aqueous solution (molecular weight 5,000) is added, the two are mixed uniformly, the pH is adjusted to 82 with hydrochloric acid or NaOH, placed in an 8mL quartz reaction flask, and the cap is sealed. The reaction flask was put into the microwave heating cavity, and then treated in a microwave reactor at 120°C for 30 minutes. After the reaction system is naturally cooled to room temperature, it is stored in a 4°C low-temperature refrigerator and protected from light.

[0035] For the TEM image of the silver nanoparticles prepared in Example 1, see figure 1 For the particle size distribution diagram of the silver nanoparticles prepared in Example 1, see figure 2 For the high-resolution TEM image of the silver nanoparticles prepared in Example 1, see image 3 For the selected area electron diffraction pattern of the silver nanoparticles prepared in Examp...

Embodiment 2

[0036] Example 2 Influence of PMAA concentration on fluorescence intensity

[0037] Measure 3mL (0.05M) AgNO with a pipette 3 The aqueous solution, placed in a 20mL beaker, add 0.3mL of polymethacrylic acid aqueous solution (molecular weight 10,000) and 0.4mL of polymethacrylic acid aqueous solution (molecular weight 50,000), mix the three evenly, adjust the pH to 8.0 with hydrochloric acid or NaOH , Placed in an 8mL quartz reaction flask, sealed with a cap, put the reaction flask into a microwave heating chamber, and then treated in a microwave reactor at 120°C for 30 minutes. After the reaction system is naturally cooled to room temperature, the fluorescence spectrum is measured at the maximum fluorescence excitation wavelength of 515 nm.

[0038] For the fluorescence spectrum of the silver nanoparticles prepared in Example 2, see Figure 5 .

Embodiment 3

[0039] Example 3 The influence of different pH on fluorescence intensity

[0040] Measure 4.8mL (0.05M) AgNO with a pipette 3 Aqueous solution, placed in a 20mL beaker, add 0.8mL sodium polymethacrylate aqueous solution (molecular weight 100,000), mix the two evenly, adjust the pH to 3.0~8.5 with hydrochloric acid or NaOH, put it in an 8mL quartz reaction flask, and press the cap Seal, put the reaction flask into the microwave heating cavity, and then treat it in a microwave reactor at 120°C for 30 minutes. After the reaction system is naturally cooled to room temperature, the fluorescence spectrum is measured at the maximum fluorescence excitation wavelength of 515 nm.

[0041] For the fluorescence spectrum of the silver nanoparticles prepared in Example 3, see Image 6 .

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Abstract

The invention provides a method for synthesizing fluorescent silver nano-particles under microwave by polymethylacrylic acid, relating to fluorescent silver nano-particles, and provides the method for synthesizing the fluorescent silver nano-particles under microwave by polymethylacrylic acid. In the method, the polymethylacrylic acid is used as a stabilizing agent and a reducing agent to synthesize the fluorescent silver nano-particles by a microwave method; silver nitrate aqueous solution is prepared; polymer is added into the silver nitrate aqueous solution, and is stirred to prepare reaction precursor solution; the reaction precursor solution is filled in a quartz reaction flask, the quartz reaction flask is sealed and subject to a microwave heating reaction; and after the microwave heating reaction, the system is cooled to room temperature to obtain the fluorescent silver nano-particles, and the obtained product can be placed in a 4 DEG C low-temperature refrigerator to keep in dark place.

Description

Technical field [0001] The invention relates to a fluorescent nano silver particle, in particular to a method for synthesizing fluorescent silver nano particle by a polymethacrylic acid microwave method and its application in copper ion detection. Background technique [0002] Silver nanoparticles have become one of the hot spots in the research field of nanomaterials in recent years due to their characteristics such as quantum size effect, small size effect, and ideal optical and electrical properties. When the size of silver nanoparticles is gradually reduced to the Fermi wavelength (<0.5nm), they will exhibit similar characteristics to semiconductors, produce energy level separation, and emit fluorescence. [0003] Due to the limitation of the preparation method, the early research mainly focused on the basic theoretical research. In recent years, with the improvement of preparation methods, silver quantum dots with good chemical stability and high fluorescence efficiency ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 翁建崔强丁家包
Owner XIAMEN UNIV
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