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based on dandelion-like ag/wo 3-x SERS substrates, preparation methods and applications of micro/nanostructured composites

A micro-nano structure, dandelion-like technology, applied in the field of cleaning SERS substrates, can solve the problem of easy re-contamination of the surface, and achieve the effects of high yield, high-sensitivity SERS analysis and detection, and mild reaction conditions

Active Publication Date: 2020-05-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Plasma bombardment or sputtering in a vacuum environment requires expensive vacuum equipment, and the cleaned surface is prone to recontamination, etc.

Method used

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  • based on dandelion-like ag/wo <sub>3-x</sub> SERS substrates, preparation methods and applications of micro/nanostructured composites
  • based on dandelion-like ag/wo <sub>3-x</sub> SERS substrates, preparation methods and applications of micro/nanostructured composites
  • based on dandelion-like ag/wo <sub>3-x</sub> SERS substrates, preparation methods and applications of micro/nanostructured composites

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Experimental program
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Effect test

Embodiment 1

[0034] The invention provides a SERS substrate based on a three-dimensional bionic micro-nano structure for pesticide residue detection and a construction method thereof. The SERS substrate has the advantages of clean surface and recyclable utilization. First of all, the present invention proposes a method for preparing dandelion-like Ag / WO 3-x (02.72 Micro-nanostructures (i.e. dandelion-like WO 2.72 Micro-nano thorn balls) hydrothermal reaction (see figure 1 ); (2), the WO 2.72 In situ reduction of silver nanoparticles on micro / nanostructured surfaces. Then the dandelion-like Ag / WO prepared by self-assembly on the surface of solid substrate by spin coating method 3-x (03-x (0<x<0.28) Composite SERS substrate.

[0035] Dandelion Ag / WO 3-x (0<x<0.28) The preparation method of the micro-nano structure is:

[0036] (1) With tungsten hexachloride (WCl 6 ) as a precursor, fully dissolved in absolute ethanol and then transferred to a hydrothermal reactor, and reacted at 180°...

Embodiment 2

[0050] 1) Add 1.6g of WCl 6 Add the solid powder into 100mL of absolute ethanol and fully stir until completely dissolved (molar concentration is about 0.04M), then quickly transfer to a 100mL hydrothermal reaction kettle; put the sealed hydrothermal reaction kettle into a vacuum oven, Raise the temperature from room temperature to 160°C at a rate of 10°C / min, then keep it warm for 12 hours, and cool it down to room temperature naturally after the keep warm;

[0051] 2) Open the hydrothermal reaction kettle, separate the precipitate obtained by vacuum filtration, rinse the precipitate three times with deionized water and absolute ethanol, and then dry it in vacuum at 60°C for 4 hours, and the obtained powder is non- Stoichiometric dandelion-like WO 2.72 Micro-nano structure, spare;

[0052] 3) 0.6g of prepared dandelion-like WO 2.72 Micro-nanostructures were added into 120mL deionized water to obtain a suspension, and then, at room temperature, 0.1M silver nitrate aqueous sol...

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Abstract

The invention provides a dandelion-like Ag / WO3-x micro-nanostructured composite material-based SERS substrate, and a preparation method and an application thereof. The preparation method comprises the following steps: carrying out a hydrothermal reaction on WCl6 and anhydrous ethanol to prepare a dandelion-like WO2.72 acanthosphere structure, and loading high-density silver nanoparticles onto the surface of the dandelion-like WO2.72 acanthosphere by using the weak reductibility of WO2.72 and using silver nitrate as an oxidant in order to obtain a dandelion-like Ag / WO3-x micro-nanostructure; and spin-coating the Ag / WO3-x micro-nanostructure on the surface of a solid-phase substrate, and carrying out self assembling to obtain the SERS substrate. The preparation method has the advantages of simplicity, mild conditions, no large devices, and high yield, and is suitable for industrial production; and the prepared dandelion-like Ag / WO3-x micro-nanostructure has a unique three-dimensional structure, and allows the recyclable SERS substrate with clean surface to be obtained, so the SERS substrate has wide application prospect in the fields of SERS detection, catalysis and sensing.

Description

technical field [0001] The invention relates to a recyclable clean SERS substrate, in particular to a dandelion-like Ag / WO 3-x (0<x<0.28) SERS substrate of micro-nano structure composite material and its preparation method and application in pesticide residue detection. Background technique [0002] The rapid development of agricultural industrialization makes the production of agricultural products more and more dependent on exogenous substances such as pesticides, antibiotics and hormones. However, the unreasonable use of various pesticides will inevitably lead to pesticide residues in agricultural products beyond the safe range, and seriously affect food safety. At present, there are many kinds of rapid detection methods for pesticide residues, which are mainly divided into biochemical analysis methods, chromatographic detection methods, and spectral analysis methods according to their principles. Among them, Surface-enhanced Raman Scattering (SERS) based on Rama...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 赵永席黄剑马大衍徐可为陈锋
Owner XI AN JIAOTONG UNIV
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