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Portable disposable surface-enhanced Raman/colorimetric dual sensor as well as preparation method, detection method and application thereof

A surface-enhanced Raman and dual-sensor technology, which is applied in the field of nanomaterial preparation and chemical analysis, can solve the problems of not being easy to carry, poor storage stability of ion nanoparticles, and difficulty in on-site detection, etc., to achieve convenient storage and portability, and low price. Inexpensive, the effect of improving stability

Active Publication Date: 2020-08-14
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a portable and disposable surface-enhanced Raman / colorimetric dual sensor and its preparation method in order to solve the problem of poor storage stability of ionic nanoparticles in the prior art and the difficulty of carrying it, which makes on-site detection difficult. , detection methods and applications

Method used

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  • Portable disposable surface-enhanced Raman/colorimetric dual sensor as well as preparation method, detection method and application thereof
  • Portable disposable surface-enhanced Raman/colorimetric dual sensor as well as preparation method, detection method and application thereof
  • Portable disposable surface-enhanced Raman/colorimetric dual sensor as well as preparation method, detection method and application thereof

Examples

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Embodiment 1

[0057] This example is used to prepare a portable disposable surface-enhanced Raman / colorimetric dual sensor based on gold nanoparticles. The detection process of the sensor is as follows figure 1 Shown, the preparation method of sensor comprises the following steps:

[0058] 1) Synthesis of gold colloid solution: accurately add 4.8mL 30mmol / L tetrachloroauric acid solution (HAuCl 4 ), then add deionized water to dilute to 100mL (HAuCl 4 Concentration is 1.4mmol / L) and heated to slight boiling; then dropwise add 10mL 1mg / L sodium citrate solution, and continue to boil for 30min to obtain gold colloid solution (the transmission electron microscope picture of AuNPs is shown in figure 2 As shown, the particle size is about 50nm); after the solution was cooled to room temperature, it was centrifuged at a high speed of 8000r / min for 10min, and the supernatant was removed to obtain concentrated AuNPs, that is, the colloidal solution of ionic nanoparticles and stored at 4 ℃ in the...

Embodiment 2

[0061] This example is used to prepare a portable disposable surface-enhanced Raman / colorimetric dual sensor based on silver nanoparticles. During the preparation process, the nanoparticle precursor solution used is 1 mmol / L silver nitrate deionized aqueous solution, and With embodiment 1.

Embodiment 3

[0063] This example is used to use the storable cotton swab prepared in Example 1 and Example 2 to make standard colorimetric cardboard. The specific preparation process includes: applying acetamiprid of different standard concentrations on the surface of the cotton swab, breaking the Tube body 2 at position 6 of the indentation part, eliminate the vacuum area, and the gold glue / silver glue solution in the tube body 2 is dipped into the cotton ball downwards under the action of the upper atmospheric pressure, and then the cotton swab is left to stand for 5 minutes to make acetamiprid and The gold colloid / silver colloid solution is fully contacted, and the different colors of the AgNPs on the surface of the cotton swab (color-changing sampling part) are observed with the naked eye, and a standard color comparison card (such as Figure 4 shown).

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Abstract

The invention relates to a portable disposable surface-enhanced Raman / colorimetric dual sensor as well as a preparation method, a detection method and application thereof. The sensor comprises a sample measuring tube and a sampling part. The sample measuring tube comprises a tube body, an opening end and a sealing end arranged at two ends of the tube body, a detection solution section arranged inthe tube body, and a closed section. The preparation method comprises the following steps: preparing an ion nanoparticle colloidal solution by adopting a sodium citrate reduction method, and injectingthe ion nanoparticle colloidal solution into the tube body in a vacuum state to obtain the sensor. The detection method comprises the following steps: wiping the surface of a to-be-detected object through a sampling part; breaking the closed section of the tube body to immerse a detection solution into the sampling part; and then performing colorimetric detection or in-situ SERS detection on a discoloration sampling part to obtain qualitative and quantitative analysis results. Compared with the prior art, the portable disposable surface-enhanced Raman / colorimetric dual sensor can meet the requirement for large-batch rapid analysis in a laboratory, is convenient to use at a time in pollution field detection to avoids cross contamination; and a novel portable device for fruit and vegetablepesticide residue detection, emergency analysis and judicial expertise can be provided.

Description

technical field [0001] The invention belongs to the technical field of preparation and chemical analysis of nanomaterials, and relates to a portable disposable surface-enhanced Raman / colorimetric dual sensor and its preparation method, detection method and application, especially to a storable cotton swab-based sensor Portable and disposable surface-enhanced Raman / colorimetric dual sensor and its preparation method, detection method and application. Background technique [0002] Ionic nanoparticles (NPs), such as gold nanoparticles (AuNPs), silver nanoparticles (AgNPs), etc., exhibit unique properties due to their localized surface plasmon resonance (LSPR). When the size, shape, dielectric properties of the surrounding medium, and the distance between particles change, the NPs themselves will change in color, which can generate a colorimetric signal that is helpful for detection, and the analyte can be easily monitored with the naked eye. The colorimetric method for NPs agg...

Claims

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Application Information

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IPC IPC(8): G01N21/65G01N21/78B82Y15/00
CPCG01N21/658G01N21/78B82Y15/00Y02A50/30
Inventor 李原婷杨圆圆李学剑韩生蔺华林王露露马健胡晓敏
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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