Fluorescent silver cluster, and preparation method and application thereof

A fluorescence and cluster technology, applied in fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of poor controllability, high cost, complicated process, etc., and achieve excellent stability, high sensitivity and specificity. Effect

Inactive Publication Date: 2011-07-20
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Application Information

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Problems solved by technology

[0004] However, the synthesis process used in the above-mentioned mercury ion detection technology often involves many com

Method used

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  • Fluorescent silver cluster, and preparation method and application thereof
  • Fluorescent silver cluster, and preparation method and application thereof
  • Fluorescent silver cluster, and preparation method and application thereof

Examples

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Example Embodiment

[0043] Example 1 Preparation of water-soluble silver clusters:

[0044] Add 20.63mg of lipoic acid (Hla) and 10ml of deionized water into a round bottom flask, stir quickly, most of the lipoic acid will not dissolve; then slowly drop 100ul of 1mol / L NaOH aqueous solution, the hydrogen ion of the carboxyl group of lipoic acid It is neutralized by NaOH and dissolved in water; then add 100ul of AgNO3 solution with a concentration of 25mM. After stirring for five minutes, slowly add 100ul of newly prepared NaBH4 solution with a concentration of 300mM. Observe that the solution will gradually turn brown, and then use tin foil. Keep away from light, overnight at room temperature; take it out the next day, the solution turns light yellow, that is, the required fluorescent silver cluster particles are generated. Observed by transmission electron microscope, the cluster size is found to be about 1nm (see figure 1 ), its optical properties such as figure 2 As shown, the emission wavelength...

Example Embodiment

[0047] Example 2 Fluorescence experiment on the selectivity of silver cluster particles to various ions:

[0048] Take the same volume of silver cluster solution and use metal ion salt (Hg 2+ , Mg 2+ , Pb 2+ , Zn 2+ , Cu 2+ ) Make the same solution concentration, use a pipette to take a small volume of the solution from each of these metal ion salts, and add it to the prepared silver cluster aqueous solution. The final concentration of various ions is 20uM. Add the above ions The fluorescence of the latter solution was quickly measured with a fluorescence spectrophotometer, and the fluorescence spectrum was measured at 420nm. The results are shown in the attached file. image 3 .

Example Embodiment

[0049] Example 3 Fluorescence response experiment of silver cluster nanoparticles to various concentrations of mercury ions:

[0050] Take the same volume of silver cluster solution, and mix the mercury salt into solutions of different concentrations according to the gradient, then use a pipette to take a small volume of the solution from each of these mercury ion salts, and add them to the prepared silver cluster aqueous solution , Measure the fluorescence of the above-mentioned solution after adding ions quickly with a fluorescence spectrophotometer, select excitation at 420nm, and measure the fluorescence spectrum. The results are shown in the attached file. Figure 4 .

[0051] In summary, the present invention utilizes the solubility of lipoic acid under alkaline conditions and the easy coordination of sulfur elements with silver ions, and proposes a water-soluble fluorescent silver cluster and its preparation method. The size of the fluorescent silver cluster is very high. S...

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Abstract

The invention relates to a fluorescent silver cluster, and a preparation method and application thereof. The average particle size of the fluorescent silver cluster is 1nm, and the fluorescent silver cluster can emit fluorescence, of which the wavelength is 650nm or so, under the excitation of light with different wavelengths. The preparation method comprises the following steps: reacting a silver salt and a protective agent in a water solution to generate a soluble silver complex, and slowly adding a reducer to generate the water-soluble fluorescent silver cluster. The fluorescent silver cluster can be used as a reagent for detecting mercury ions. The high-stability nano silver cluster, which can emit strong red fluorescence within the range of quantum scale, is formed by using common and cheap chemical reagents through a simple and practical synthesis technique. The nano silver cluster has very high sensitivity and specificity when being used as a reagent for detecting metallic ions, especially mercury ions. The invention can be widely used in the technical fields of environment detection, food safety and the like.

Description

Technical field [0001] The invention specifically relates to a fluorescent silver cluster, a preparation method and application thereof. The fluorescent silver cluster can be used for qualitatively or semi-quantitatively detecting mercury ions in a water environment with high sensitivity and selectivity. Background technique [0002] Mercury ions and salts are very toxic chemical substances. Due to their persistence, mobility and high bioaccumulation, they pose a serious threat to humans and the environment. They cannot be obtained through physical, chemical, or biological methods. Effective degradation can only be transferred from one form to another. Mercury is widely used in various industrial production processes due to its unique chemical and physical properties. Most of them are eventually converted into mercury cations and discharged into nature. The main source of environmental mercury pollution is the mercury-containing discharge from industrial production. Wastewater. ...

Claims

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Application Information

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IPC IPC(8): C09K11/58G01N21/64
Inventor 王强斌陈中兰祥
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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