Fluorescent silver nanoparticle and preparation method thereof

A technology of silver nanoparticles and fluorescence, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve problems that have not been reported, and achieve the effect of simple methods

Inactive Publication Date: 2010-08-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for silver nanoparticles, although researchers have prepared particles of various shapes and their properties have been well characterized, the synthesis of silver nanoparticles with high fluorescence efficiency has not been reported yet.

Method used

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  • Fluorescent silver nanoparticle and preparation method thereof
  • Fluorescent silver nanoparticle and preparation method thereof
  • Fluorescent silver nanoparticle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] At 70°C, 3 μmol AgNO 3 Add it into 10 mL of pure water containing 5 mM cetyltrimethylammonium chloride and 2 mM ascorbic acid, and stir for 2 h in the dark to obtain fluorescent silver nanoparticles. The fluorescence emission peak of the silver nanoparticles was measured at 475nm on a fluorescence spectrophotometer. Under natural light, the silver nanoparticles fluoresced blue-green when viewed against a black background. Its fluorescence quantum yield is 0.5%.

Embodiment 2

[0021] At 100°C, 10 μmol AgNO 3 Add it into 10 mL of pure water containing 0.1 mM cetyltrimethylammonium bromide and 2 mM ascorbic acid, and stir for 15 minutes in the dark to react to obtain fluorescent silver nanoparticles. The fluorescence emission peak of the silver nanoparticle is at 440nm, and when observed with a black background under natural light, the silver nanoparticle emits blue fluorescence. Its fluorescence quantum yield is 0.7%.

Embodiment 3

[0023] At 90°C, 3 μmol AgNO 3 Add it into 10 mL of pure water containing 5 mM cetyltrimethylammonium chloride and 2 mM ascorbic acid, and let it stand in the dark for 1 h to obtain fluorescent silver nanoparticles. The fluorescent emission peak of the silver nanoparticle is a broad peak between 425nm and 475nm, and when observed with a black background under natural light, the silver nanoparticle emits blue fluorescence. Its fluorescence quantum yield is 0.8%.

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Abstract

The invention discloses a fluorescent silver nanoparticle and a preparation method thereof. The fluorescent silver nanoparticle is prepared according to the following steps: mixing a mixed aqueous solution of a wrapping agent and a reducing agent with a soluble silver salt, and reacting under the light-resistant or the irradiant condition to obtain the fluorescent silver nanoparticle; wherein thewrapping agent is cetyltrimethyl ammonium chloride or cetyltrimethyl ammonium bromide, and the reducing agent is ascorbic acid. The particle fluoresces under natural light, the yield of the fluorescent quantum is over 0.5%, and the particle can be fully settled out at the rotating speed of 4000-6000 rpm through the centrifugation. When the particle is kept in dark place at 4 DEG C, the fluorescence of the particle can be stable for more than 4 months. The fluorescent particles of different emission wavelengths (420-480 nm) can be obtained by controlling the reaction conditions (such as keeping out of the sun or irradiation of natural light, stirring or static placing and the like). The method is simple and rapid, and provides a new path for the synthesis of the fluorescent noble metal nanoparticles.

Description

technical field [0001] The invention relates to a fluorescent silver nano particle and a preparation method thereof. Background technique [0002] Due to their excellent optical properties, such as high quantum yield, wide range of excitation and emission wavelengths, and high optical stability, fluorescent nanomaterials have attracted great attention from researchers. Among them, quantum dots are currently widely studied fluorescent nanomaterials, but their toxicity to organisms is the biggest concern of people. In contrast, noble metal nanomaterials such as gold and silver have good biocompatibility and are better choices for synthesizing fluorescent nanomaterials. [0003] According to the size of noble metal nanomaterials, they can be divided into nanoparticles (several nanometers to tens of nanometers) and nanoclusters (less than one nanometer). The energy levels of nanoparticles are continuous, and localized surface plasmon resonance phenomenon exists on the surface,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/08C09K11/56
Inventor 陈义袁勋
Owner INST OF CHEM CHINESE ACAD OF SCI
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