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A noble metal nanocrystal with tunable plasmon resonance absorption characteristics in visible band and preparation method thereof

A noble metal nanocrystal and plasmon resonance technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of limited control of LSPR absorption peaks, uneven shape and size, etc., and achieve uniform shape and size, and good dispersion , The effect of simple preparation process

Inactive Publication Date: 2018-04-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the structures of hollow silver-gold nanocrystals that have been reported include spherical, cubic, triangular, circular, etc., but these reports have very limited control of the LSPR absorption peak, and the shape and size are not uniform enough.

Method used

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  • A noble metal nanocrystal with tunable plasmon resonance absorption characteristics in visible band and preparation method thereof
  • A noble metal nanocrystal with tunable plasmon resonance absorption characteristics in visible band and preparation method thereof
  • A noble metal nanocrystal with tunable plasmon resonance absorption characteristics in visible band and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The concrete steps of preparation are:

[0029] (1) Preparation of silver nanocrystal seeds. First, measure 75 mL of glycerin and 25 mL of deionized water, mix them and heat to 95 °C; then, add 28.5 mg of AgNO 3 and stir evenly; finally, 1ml of 0.25M trisodium citrate was added thereto, and after stirring at 95° C. for 1 hour, a deep wine red silver nanocrystal seed solution was obtained.

[0030] (2) Preparation of silver-gold nanocrystals. First, 30 mg of polyvinylpyrrolidone was dissolved in 30 mL of deionized water and heated to 105 °C; then, 6 mL of the silver nanocrystal seed solution was added to it and stirred evenly; finally, 150 μL of 0.01 M chloroauric acid was added Wherein, after stirring at 105° C. for 10 min, a silver-gold nanocrystal solution is obtained.

[0031] figure 1 It is the absorption spectrum of the noble metal nanocrystal obtained in Example 1 of the present invention. It can be seen from the figure that the position of the plasmon resonan...

Embodiment 2

[0033] The concrete steps of preparation are:

[0034] (1) Preparation of silver nanocrystal seeds. First, measure 75 mL of glycerin and 25 mL of deionized water, mix them and heat to 95 °C; then, add 28.5 mg of AgNO 3 and stir evenly; finally, 1ml of 0.25M trisodium citrate was added thereto, and after stirring at 95° C. for 1 hour, a deep wine red silver nanocrystal seed solution was obtained.

[0035] (2) Preparation of silver-gold nanocrystals. First, 30 mg of polyvinylpyrrolidone was dissolved in 30 mL of deionized water and heated to 105 °C; then, 6 mL of the silver nanocrystal seed solution was added to it and stirred evenly; finally, 300 μL of 0.01 M chloroauric acid was added Wherein, after stirring at 105° C. for 10 min, a silver-gold nanocrystal solution is obtained.

[0036] image 3 It is the absorption spectrum of the noble metal nanocrystal obtained in Example 2 of the present invention. It can be seen from the figure that the plasmon resonance absorption pe...

Embodiment 3

[0038] The concrete steps of preparation are:

[0039] (1) Preparation of silver nanocrystal seeds. First, measure 75 mL of glycerin and 25 mL of deionized water, mix them and heat to 95 °C; then, add 28.5 mg of AgNO 3 and stir evenly; finally, 1ml of 0.25M trisodium citrate was added thereto, and after stirring at 95° C. for 1 hour, a deep wine red silver nanocrystal seed solution was obtained.

[0040](2) Preparation of silver-gold nanocrystals. First, 30 mg of polyvinylpyrrolidone was dissolved in 30 mL of deionized water and heated to 105 °C; then, 6 mL of the silver nanocrystal seed solution was added to it and stirred evenly; finally, 500 μL of 0.01 M chloroauric acid was added Wherein, after stirring at 105° C. for 10 min, a silver-gold nanocrystal solution is obtained.

[0041] Figure 5 It is the absorption spectrum of the noble metal nanocrystal obtained in Example 3 of the present invention. It can be seen from the figure that the position of the plasmon resonan...

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Abstract

The invention discloses a noble metal nanocrystal with adjustable plasmon resonance absorption characteristics in the visible wave band and a preparation method thereof. The galvanic displacement reaction between them is prepared, specifically: (1) silver nitrate is added to the mixed solution of glycerin and water containing a reducing agent to prepare silver nanocrystal seeds; (2) the silver nitrate is added to an aqueous solution containing a surfactant Silver nanocrystal seeds and an aqueous solution of chloroauric acid are added, and the elemental silver reduces the chloroauric acid to elemental gold to obtain a silver-gold nanocrystal solution. The invention realizes that the plasmon resonance absorption wavelength can be adjusted in the visible band (400-700nm). The invention has the advantages of simple preparation process, good product dispersibility, uniform shape and size, adjustable plasmon resonance absorption wavelength in the visible band, etc., and can be widely used in the fields of biological imaging, drug release, precious metal enhanced fluorescence, surface enhanced Raman, etc. .

Description

technical field [0001] The invention relates to a noble metal nanocrystal with ion resonance absorption characteristics, in particular to a noble metal nanocrystal with adjustable plasma resonance absorption characteristics in the visible wave band and a preparation method thereof. Background technique [0002] Noble metal nanomaterials, due to their unique Localized Surface Plasmon Resonance (LSPR) characteristics, have great application value in the fields of biological imaging, drug release, noble metal-enhanced fluorescence, surface-enhanced Raman and other fields. Currently, silver nanocrystals and gold nanocrystals are commonly used to realize LSPR, but their LSPR peaks are usually around 400nm and 520nm. Since the LSPR characteristics strongly depend on the geometric structure, size, dielectric constant and composition of noble metal nanocrystals, the position of the LSPR absorption peak can be realized by designing the geometric structure and composition of noble met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/07
Inventor 叶松李松王德平
Owner TONGJI UNIV
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