Composite nanomaterial and preparation method and application thereof

A technology of composite nanomaterials and nanosheets, applied in the field of composite materials, can solve the problems of high cost and low detection sensitivity, and achieve the effect of mild and controllable reaction conditions, simple preparation method, and enhanced SERS signal

Inactive Publication Date: 2019-11-15
SHENZHEN PEOPLES HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the SERS substrates are derived from pure noble metal nanoparticles (such as gold and silver nanoparticles), but the cost is high, especially the detection sensitivity of pesticide molecules with complex components is low.

Method used

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  • Composite nanomaterial and preparation method and application thereof
  • Composite nanomaterial and preparation method and application thereof
  • Composite nanomaterial and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A composite nanomaterial composed of two-dimensional MXene nanosheets and one-dimensional gold nanorods through electrostatic adsorption.

[0046] The preparation method of this composite nanomaterial comprises the following steps:

[0047] (1) Preparation of two-dimensional MXene nanosheets:

[0048] Under anaerobic conditions, take the multi-layer MXene powder, disperse the multi-layer MXene powder in N-methylpyrrolidone to obtain a dispersion with a concentration of 1.0 mg / mL, and perform probe ultrasonication on the dispersion at a power of 1000W for 10 hours , followed by ultrasonication in a water bath at a power of 300W for 10h. After ultrasonication, centrifuge at 3500rpm / 10min to collect the supernatant to obtain two-dimensional MXene nanosheets. After centrifugation again at 10000rpm / 10min, the precipitate was dispersed in 1mL of water.

[0049] (2) Preparation of one-dimensional gold nanorods:

[0050] Gold nanorods were synthesized by a one-step method. U...

Embodiment 2

[0059] A method for preparing a composite nanomaterial for pesticide trace detection, comprising the following steps:

[0060] (1) Preparation of two-dimensional MXene nanosheets:

[0061] Under anaerobic conditions, take multi-layer MXene powder, disperse multi-layer MXene powder in the first organic solvent to obtain a dispersion with a concentration of 0.5 mg / mL, and perform probe ultrasonication on the dispersion at a power of 700W 8h, followed by ultrasonication in a water bath for 8h at a power of 400W. After ultrasonication, centrifuge at 3500rpm / 10min to collect the supernatant to obtain two-dimensional MXene nanosheets. After centrifugation again at 10000rpm / 10min, disperse the precipitate in 0.5mL water .

[0062] (2) Preparation of one-dimensional gold nanorods:

[0063] Gold nanorods were synthesized by a one-step method. Under room temperature conditions, the chloroauric acid solution with a concentration of 0.004mol / L, the hexadecyltriethylammonium bromide wit...

Embodiment 3

[0071] A method for preparing a composite nanomaterial for pesticide trace detection, comprising the following steps:

[0072] (1) Preparation of two-dimensional MXene nanosheets:

[0073] Under anaerobic conditions, take multi-layer MXene powder, disperse multi-layer MXene powder in the first organic solvent to obtain a dispersion with a concentration of 0.75 mg / mL, and perform probe ultrasonication on the dispersion at a power of 1400W 5h, followed by water-bath ultrasonication at a power of 200W for 6h. After ultrasonication, centrifuge at 3500rpm / 10min, collect the supernatant to obtain two-dimensional MXene nanosheets, and then centrifuge again at 10000rpm / 10min, and disperse the precipitate in 2mL of water.

[0074] (2) Preparation of one-dimensional gold nanorods:

[0075] Gold nanorods were synthesized by a one-step method. Under room temperature conditions, concentration is the chloroauric acid solution of 0.004mol / L, the hexadecyltriethylammonium bromide that conce...

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Abstract

The invention discloses a composite nanomaterial, a preparation method and application thereof, a surface enhanced Raman scattering (SERS) substrate, a detection device and a detection method. Throughthe composite nanomaterial, the SERS substrate can have better sensitivity. The composite nanomaterial comprises a two-dimensional MXene nanosheet and a one-dimensional metal nanomaterial adsorbed onthe two-dimensional MXene nanosheet. According to the nanomaterial, through an adsorption function, the one-dimensional nano-metallic material is uniformly loaded on the two-dimensional nanosheet, many hotspots can be generated after loading due to an extremely high specific surface area and physico-chemical properties of the nanomaterial, and the purpose of enhancing an SERS signal is achieved;and the nanomaterial has sensitive Raman detection performance, the content of pesticide residues can be quickly detected, and the pesticide detection limit can reach 10<-10>mol / L. The prepared composite nanomaterial has good detection reproducibility when used for detecting the Raman substrate and can be widely applied to detection of other organic pollutants, for example, food additives.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a composite nanomaterial and its preparation method and application. Background technique [0002] As an important means of agricultural production, pesticides play an important role in agricultural development. However, the irrational use and excessive use of pesticides have resulted in excessive pesticide residues in agricultural products, seriously threatening human health. In recent years, the phenomenon of grain crops being refused to export due to excessive pesticides, food poisoned by excessive pesticides, and water with excessive pesticide content making it undrinkable has aroused widespread concern in the society. Eating foods with excessive pesticide residues will cause chronic poisoning of humans and animals, leading to diseases, cancer, and even affect the next generation. Therefore, to ensure the quality and safety of agricultural products, the detectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N21/658
Inventor 陈月谢寒寒
Owner SHENZHEN PEOPLES HOSPITAL
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