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A preparation method of silver-based composite nanomaterial with surface-enhanced Raman activity and its products and applications

A technology of nanomaterials and silver-based composites, applied in nanostructure manufacturing, Raman scattering, nanotechnology, etc., can solve the problems of difficult to guarantee detection repeatability, shortened service life, high preparation cost, etc., achieving remarkable SERS effect and easy control , the effect of not easy to reunite

Inactive Publication Date: 2017-02-01
HAINAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to obtain monodisperse noble metal colloids with controllable particle size, the preparation process usually requires the use of special reagents and protective agents under heating conditions, and the preparation cost is high; at the same time, nanoparticles have higher particle size due to their small particle size. Surface energy is very easy to agglomerate, resulting in reduced activity, severely shortened service life, and difficult to guarantee detection repeatability

Method used

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  • A preparation method of silver-based composite nanomaterial with surface-enhanced Raman activity and its products and applications
  • A preparation method of silver-based composite nanomaterial with surface-enhanced Raman activity and its products and applications
  • A preparation method of silver-based composite nanomaterial with surface-enhanced Raman activity and its products and applications

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Weigh 160 mg of melamine and 68 mg of silver nitrate with an electronic analytical balance, and dissolve them in 55 mL and 5 mL of water, respectively. Then, the newly prepared silver nitrate solution was slowly added dropwise to the melamine aqueous solution under stirring at room temperature, and continued to stir for 30 minutes to obtain a white nearly gelatinous substance, and the supernatant was discarded by centrifugation to obtain an intermediate product. The obtained intermediate product is a solid one-dimensional helical nanoribbon, and its microscopic morphology is shown in figure 1 with figure 2 , the surface of the nanobelt is smooth, the length is submillimeter, the width is about 100 nm, and the thickness is about 40 nm.

[0057] The obtained intermediate product was re-dispersed ultrasonically with 5 mL of absolute ethanol, evenly drop-coated on a glass plate with a clean surface, and dried in an oven at 45 °C. After drying, the glass plate containing t...

Embodiment 2

[0059] Weigh 160 mg of melamine and 30 mg of silver nitrate with an electronic analytical balance, and dissolve them in 55 mL and 5 mL of water, respectively. Then, the newly prepared silver nitrate solution was slowly added dropwise to the melamine solution under stirring at room temperature, and continued to stir for 30 minutes to obtain a white nearly gelatinous substance, and the supernatant was discarded by centrifugation to obtain an intermediate product. The obtained intermediate product is a solid one-dimensional helical nanoribbon, and its microscopic morphology is shown in Figure 4 , the surface of the nanobelt is smooth, the width is 100-200 nm, the thickness is 30-50 nm, and the length is submillimeter.

[0060] The obtained intermediate product was re-dispersed ultrasonically with 3 mL of absolute ethanol, evenly drop-coated on a glass plate with a clean surface, and dried in an oven at 45 °C. After drying, the glass plate containing the intermediate product was ...

Embodiment 3

[0062] Weigh 160 mg of melamine and 48 mg of silver nitrate with an electronic analytical balance, and dissolve them in 55 mL and 5 mL of water, respectively. Then, slowly drop the newly configured silver nitrate solution into the melamine solution under stirring at room temperature, and continue to stir for 30 minutes to obtain a white and nearly gelatinous substance. The supernatant was discarded by centrifugation to obtain a solid one-dimensional helical nanoribbon. intermediate product, its microscopic appearance is shown in Image 6 , the surface of the nanobelt is smooth, the width is 50-200 nm, the thickness is 40-50 nm, and the length is submillimeter.

[0063] The obtained intermediate product was re-dispersed ultrasonically with 5 mL of absolute ethanol, evenly drop-coated on a glass plate with a clean surface, and dried in an oven at 45 °C. After drying, the glass plate containing the intermediate product was immersed in 0.5 mmol / L boron Sodium hydride aqueous solu...

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Abstract

The invention discloses a preparation method of a silver-based composite nanomaterial with surface-enhanced Raman activity, a product obtained with the preparation method and an application of the silver-based composite nanomaterial. The preparation method comprises preparation steps as follows: silver ions and melamine have a coordination polymerization reaction in water, and a coordination polymer is obtained; the coordination polymer is reduced with a sodium borohydride solution, nanosilver is generated on the surface of the coordination polymer, a layer of metal oxide is deposited on the surface of the reduced intermediate product, the deposited product is calcined, and the silver-based composite nanomaterial is obtained. The intermediate product with good morphology is obtained through the simple coordination polymerization reaction, silver sources can be uniformly dispersed in the intermediate product, the intermediate product is taken as a sacrificial template, and the silver-based composite nanomaterial with good morphology is obtained through metal oxide deposition and calcination. A process is simple, particle sizes of the obtained nanosilver particles are small, the nanosilver particles are distributed in a concentrated manner and are not prone to agglomeration under the protection of metal oxide, the stability is high, the SERS (surface-enhanced Raman scattering) effect is remarkable, and the silver-based composite nanomaterial has wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing a silver-based composite nanomaterial, in particular to a method for preparing a silver-based composite nanomaterial used as a surface-enhanced Raman active substrate, and belongs to the technical field of nanomaterial preparation. Background technique [0002] Raman (Raman) spectroscopy is a widely used rapid, non-destructive detection and molecular identification technology, which can provide rich molecular structure fingerprint information at the molecular level. But since the conventional Raman scattering cross section is only 10 of that of the infrared and fluorescence processes -6 , the resulting signal is relatively weak, which seriously restricts the application of Raman spectroscopy in the field of trace detection and analysis. Since the 1970s, people have successively discovered that the Raman signal of some molecules can be significantly enhanced on the surface of rough noble metal electrodes....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B82B1/00B82B3/00G01N21/65
Inventor 窦智峰王桂振
Owner HAINAN UNIV
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