Fluorescent silver nanoparticle and preparation method thereof

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,...

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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.

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