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A kind of green preparation method and application of porous spongy ag square particles

A porous sponge and sponge-like technology, applied in the field of nanomaterials, can solve the problems of complex process and small specific surface area of ​​sponge-like porous noble metal nanoparticles, and achieve the effect of facilitating adsorption and subsequent functionalization, large specific surface area and convenient operation

Inactive Publication Date: 2021-04-02
JIANGXI SCI & TECH NORMAL UNIV
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Problems solved by technology

[0005] Aiming at the shortcomings of the traditional method for preparing sponge-like porous noble metal nanoparticles, such as complex process, the presence of surfactants, and small specific surface area, the present invention provides a green, simple and economical method for preparing porous sponge-like Ag square particles, and studies its Applications of near-infrared SERS

Method used

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  • A kind of green preparation method and application of porous spongy ag square particles
  • A kind of green preparation method and application of porous spongy ag square particles
  • A kind of green preparation method and application of porous spongy ag square particles

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Embodiment 1

[0025] As attached to the manual figure 1 The process flow diagram shown, a porous sponge-like microstructure of Ag square particles, was prepared using the following steps:

[0026] Step a, first prepare [Ag(NH 3 ) 2 ] + Solution: Add 0.45M ammonia water drop by drop to 0.45M AgNO under stirring condition 3 solution until the solution becomes clear and [Ag(NH 3 ) 2 ] + solution; the prepared [Ag(NH 3 ) 2 ] + The solution was dropped into 100mL deionized water and stirred evenly. 1 mL of 0.15M Na 2 HPO 4 The aqueous solution was added dropwise to the above [Ag(NH 3 ) 2 ] + In the solution, keep stirring for 10-20min, and centrifuge to obtain the square Ag 3 PO 4 Nanoparticles, which are matcha-colored in appearance.

[0027] Step b, Ag 3 PO 4 Square nanoparticles were redispersed in 10 mL deionized water, and 50 μL of 0.5 M NaBH 4 Aqueous solution, reaction at room temperature for 2-5 minutes, centrifuged to obtain porous sponge-like Ag square particles.

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Abstract

The invention relates to the field of nanomaterials, in particular to the green preparation of porous sponge-like Ag square particles and its application in near-infrared SERS, and proposes sodium borohydride (NaBH 4 ) reduced silver phosphate (Ag 3 PO 4 ) Square nano-particles, the method for preparing porous sponge-like Ag square particles, the sponge-like microstructure Ag square particles prepared by the present invention have strong absorption in the near-infrared, and can realize the near-infrared SERS detection. In the process of Raman measurement, if visible light is used as the excitation wavelength, the Raman signal of the target molecule will be annihilated due to strong light scattering and fluorescent background, which will lead to large detection errors and low detection sensitivity. Substantial progress has been made.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to the green preparation and application of porous sponge-like Ag square particles. Background technique [0002] Porous noble metal (such as Au, Ag) nanoparticles are widely used in electrocatalysis, drug sustained release, bioimaging, and surface-enhanced pulling due to their large specific surface area, high loading capacity, and surface plasmon resonance (Surface Plasmon Resonance, SPR) in the near-infrared. Mann scattering (SERS) and many other fields have good application prospects. [0003] At present, the methods for synthesizing porous or spongy metal micro / nanomaterials are mainly template method and dealloying corrosion method. For example, Walsh et al. used dextran as a soft template to synthesize sponge-like silver, gold, copper, silver-copper oxide and silver-titanium dioxide composites. Although this method is relatively simple, low-cost and environmentally friend...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00G01N21/65B82Y40/00
CPCG01N21/658B82Y40/00B22F9/24B22F2009/245B22F1/07B22F1/054
Inventor 门丹丹张洪华向军淮
Owner JIANGXI SCI & TECH NORMAL UNIV
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