Precious metal nanocrystalline with adjustable plasma resonance absorption characteristic in visible wave band and preparation method of precious metal nanocrystalline

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

Inactive Publication Date: 2016-08-24
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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  • Precious metal nanocrystalline with adjustable plasma resonance absorption characteristic in visible wave band and preparation method of precious metal nanocrystalline
  • Precious metal nanocrystalline with adjustable plasma resonance absorption characteristic in visible wave band and preparation method of precious metal nanocrystalline
  • Precious metal nanocrystalline with adjustable plasma resonance absorption characteristic in visible wave band and preparation method of precious metal nanocrystalline

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 3and 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 precious metal nanocrystalline with an adjustable plasma resonance absorption characteristic in a visible wave band and a preparation method of the precious metal nanocrystalline. The precious metal nanocrystalline is a silver-gold nanocrystalline formed by silver and gold and is prepared through a galvanic replacement reaction between silver and chloroauric acid. The preparation method comprises the specific steps that (1), silver nitrate is added into a mixed solution of glycerinum containing a reducing agent and water, and silver nanocrystalline seeds are prepared; and (2), the silver nanocrystalline seeds and a water solution of chloroauric acid are added into a water solution containing a surface active agent, chloroauric acid is reduced into elemental gold through elemental silver, and a silver-gold nanocrystalline solution is obtained. The plasma resonance absorption wave length of the precious metal nanocrystalline is adjustable in the visible wave band (400 nm to 700 nm). The precious metal nanocrystalline with the adjustable plasma resonance absorption characteristic in the visible wave band and the preparation method of the precious metal nanocrystalline have the beneficial effects that the preparation process is simple, the production dispersity is good, the morphology and size are even, and the plasma resonance absorption wave length is adjustable in the visible wave band, and can be widely applied to the fields of bioimaging, drug release, precious metal fluorescence enhancement, surface Raman enhancement and the like.

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, etc. 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 metal nanocryst...

Claims

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Application Information

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Patent Type & Authority Applications(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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