Rice-grain-shaped fluoride/silver composite nanometer material and preparation method and application thereof

A composite nanomaterial and nanomaterial technology, applied in the field of rice-like fluoride/silver composite nanostructure and preparation, can solve the problems of signal interference, cumbersome procedures and high cost, and achieve the elimination of Raman signal interference, simple operation and high cost. low effect

Inactive Publication Date: 2015-05-27
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the existing methods have obtained relatively ideal SERS performance, coupling agents, such as alkyl groups and biomolecules, are introduced in the synthesis process, which may cause additional signal interference, especially the Raman signal and coupling of analyte molecules. Groups with similar signals interfere more
In addition, some methods also have defects such as time-consuming, cumbersome procedures, high cost, and special post-processing.

Method used

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  • Rice-grain-shaped fluoride/silver composite nanometer material and preparation method and application thereof
  • Rice-grain-shaped fluoride/silver composite nanometer material and preparation method and application thereof
  • Rice-grain-shaped fluoride/silver composite nanometer material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 (Synthesis of rice grain NaNdF by solution method at room temperature 4 Nanoparticles)

[0037] Take 1 mL molar concentration 0.2 mol L -1The neodymium trichloride solution in a 100 mL beaker, add 30 mL deionized water and mix well, then add 1 mL molar concentration 0.2 mol L to the beaker -1 ethylenediaminetetraacetic acid (EDTA), after magnetic stirring for 30 minutes, finally add 10 mL molar concentration 0.2 mol L to the above solution -1 After the sodium fluoride solution was stirred evenly, it was transferred to a high-pressure reactor containing a polytetrafluoroethylene liner, and the temperature was set at 120 ° C. After 24 hours of constant temperature, it was naturally cooled to room temperature. Centrifuge with a high-speed centrifuge to obtain a solid and wash it repeatedly with deionized water for 3 times, then wash it once with absolute ethanol, and then disperse it in 5 mL of absolute ethanol to obtain rice-like NaNdF 4 nanoparticle suspen...

Embodiment 2

[0038] Example 2 (Synthesis of rice grain NaSmF by solution method at room temperature 4 Nanoparticles)

[0039] Take 1 mL molar concentration 1 mol L -1 Samarium trichloride solution in a 100 mL beaker, add 30 mL deionized water and mix well, then add 1 mL molar concentration 1 mol L to the beaker -1 EDTA, after magnetic stirring for 30 minutes, finally add 10 mL molar concentration 1 mol L to the above solution -1 After the sodium fluoride solution was stirred evenly, it was transferred to a high-pressure reactor containing a polytetrafluoroethylene liner, and the temperature was set at 120 ° C. After 24 hours of constant temperature, it was naturally cooled to room temperature. Centrifuge with a high-speed centrifuge, wash repeatedly with deionized water three times, and then wash once with absolute ethanol, and disperse into 5 mL of absolute ethanol to obtain rice-like NaSmF 4 Nanoparticle suspension, rice granular NaSmF 4 The structure is as Figure 1.2 shown.

Embodiment 3

[0040] Example 3 (Synthesis of rice grain NaEuF by solution method at room temperature 4 Nanoparticles)

[0041] Take 1 mL molar concentration 2 mol L -1 Europium trichloride solution in a 100 mL beaker, add 30 mL deionized water and mix evenly, then add 1 mL molar concentration 2 mol L to the beaker -1 EDTA, after magnetic stirring for 30 minutes, finally add 10 mL molar concentration 3 mol L to the above solution -1 After stirring evenly, transfer the sodium fluoride solution into a high-pressure reaction kettle containing a polytetrafluoroethylene liner, set the temperature at 140°C, keep the temperature for 36 hours, cool it to room temperature naturally, and centrifuge it with a high-speed centrifuge. Repeated washing with deionized water for 3 times, then washing once with absolute ethanol, and dispersing into 5 mL of absolute ethanol to obtain rice-like NaEuF 4 nanoparticle suspension.

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Abstract

The invention discloses a rice-grain-shaped fluoride / silver composite nanometer material. The material consists of rice-grain-shaped fluoride cores and a silver nano-particle layer, wherein silver nano-particles are gathered on the surfaces of the rice-grain-shaped cores. The invention also discloses a preparation method for the rice-grain-shaped fluoride / silver composite nanometer material and application of the rice-grain-shaped fluoride / silver composite nanometer material. Rice-grain-shaped fluoride is prepared by a hydrothermal method, and conditions are mild and controllable; the source of the rice-grain-shaped fluoride is wide, and multiple kinds of fluorides can be obtained; the silver nano-particles are sputtered in a magnetron sputtering mode, so that the method is convenient, quick, time-saving and low in cost; the product has high morphological reproducibility and can be massively produced; organic molecules and surfactant molecules are not contained in the product, so that the fluorescence interference is avoided; and according to the fluoride / silver composite nanostructure system, the fluoride absorbs the energy and transfers the energy to silver, so that the Raman scattering effect is effectively strengthened, and the single-molecule detection level can be reached on the detection of analytes.

Description

technical field [0001] The invention relates to a rice granular fluoride / silver composite nanostructure with a surface-enhanced Raman active substrate and a preparation method. Background technique [0002] The rapid detection of explosive TNT / DNT is of great significance in national security, public places and environmental monitoring and protection. The current standard methods for TNT / DNT liquid phase detection include ion chromatography and high performance liquid chromatography. Due to the low vapor pressure (<100ppb) of TNT / DNT at room temperature, it is difficult to directly detect explosive gases. Gas chromatography / mass spectrometry (GC / MS) is the most commonly used method for gas phase TNT / DNT detection. However, these methods have defects such as high detection cost, large equipment, time-consuming, and low sensitivity. The detection of explosives in public places and in the field must be completed without sample preparation and fast response time. The curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 赵爱武张茂峰
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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