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AgNR/O-g-C3N4 substrate, preparation method and application thereof in recyclable SERS sensitive detection

An o-g-c3n4, m-o-g-c3n4 technology, applied in the application of cyclable SERS sensitive detection, AgNR/O-g-C3N4 substrate field, can solve the problems of weak reusability, oxidation, SERS activity reduction, etc., to achieve high reproducibility properties and stability, improved stability, and the effect of a simple preparation method

Active Publication Date: 2018-12-11
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once Ag is exposed to air, it will be oxidized rapidly, resulting in a decrease in SERS activity.
And the substrate usually exhibits weak reusability due to saturated adsorption of analytes

Method used

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  • AgNR/O-g-C3N4 substrate, preparation method and application thereof in recyclable SERS sensitive detection
  • AgNR/O-g-C3N4 substrate, preparation method and application thereof in recyclable SERS sensitive detection
  • AgNR/O-g-C3N4 substrate, preparation method and application thereof in recyclable SERS sensitive detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 AgNR / O-g-C 3 N 4 Preparation of substrate

[0028] 1. Preparation of AgNR Arrays

[0029] Glass slides were cleaned in piranha solution (80% sulfuric acid, 20% hydrogen peroxide), rinsed with deionized water, and dried under a nitrogen atmosphere. Then, place the cleaned slide on the deposition platform. In an electron beam evaporator (DE500 electron beam evaporation deposition method), at 1×10 -6 Under the pressure of Torr, a 20nm titanium film and a 500nm silver film system were deposited at a rate of 0.2nm / s and 0.3nm / s, respectively. Then the deposition table was rotated at a deposition angle of 86°, and a 2000 nm silver film was deposited at a rate of 0.3 nm / s to obtain an AgNR array.

[0030] 2. Preparation of Monolayer O-g-C 3 N 4

[0031] First, melamine (2 g) was placed in a muffle furnace, and the temperature was raised to 550° C. at a rate of 2° C. / min, and calcined for 4 hours. Then, the melamine was naturally cooled to room temperature to...

Embodiment 2

[0034] Example 2 AgNR / O-g-C 3 N 4 Determination of properties of the substrate

[0035] 1. AgNR / O-g-C 3 N 4 SERS Sensitivity Determination of Substrates

[0036] To prepare standard solutions of various concentrations, 10 -3 The R6G solution of M was diluted to a concentration of 1.0×10 -5 M to 1.0×10 -9 M's solution. For each sample, three SERS spectra were acquired from different positions of the substrate. The laser power is 10mW, the integration time is 5s, the result is as follows image 3 shown. from image 3 It can be seen that the detection limit of R6G is as low as 8.2×10 -10 M, indicating AgNR / O-g-C 3 N 4 The substrate has high detection sensitivity.

[0037] 2. AgNR / O-g-C 3 N 4 Stability determination of the substrate

[0038] Place the same substrate in the air and detect 5×10 R6G every 7 days -5 The signal of M, the detection result is as follows Figure 4 shown, from Figure 4 It can be seen that the SERS signal of R6G hardly changed after 21 ...

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Abstract

In the preparation method of AgNR / O-g-C3N4 substrate, O-g-C3N4 modification is carried out on the surface of AgNR to prepare multi-performance nanostructures for sensitive and recyclable SERS analysis. The AgNR / O-g-C3N4 substrate prepared by the preparation method and application thereof in recyclable SERS sensitive detection is disclosed. The method for preparing the AgNR / O-g-C3N4 substrate provided by the invention is simple; in the AgNR / O-g-C3N4 substrate provided by the invention, the O-g-C3N4 on the AgNR / O-g-C3N4 substrate can improve the adsorption capacity of the molecule and improve the SERS performance of the AgNRs and can avoid direct contact between AgNR and the atmosphere which improves the stability of AgNRs; the AgNR / O-g-C3N4 substrate of the invention can produce a significant Raman enhancement effect, and the SERS signal intensity obtained from AgNR / O-g-C3N4 is about three times stronger than unmodified AgNR, and the SERS signal intensity has high reproducibility and stability, has excellent photodegradability, and can perform multiple cycles of detection.

Description

technical field [0001] The present invention relates to SERS substrates, in particular to AgNR / O-g-C 3 N 4 The substrate, its preparation method and its application in the sensitive detection of recyclable SERS. Background technique [0002] Due to rapid population growth and increased agricultural and industrial activities, large amounts of organic pollutants are discharged into the aquatic environment. These pollutants can enter organisms through the biological chain, affect human health, and even have acute toxicity and carcinogenicity. Currently common techniques such as fluorescence spectroscopy, chromatographic analysis, capillary electrophoresis and electrochemical analysis have achieved the detection of these environmental organic pollutants, but these methods are usually technically demanding, time-consuming and low-sensitivity. Therefore, it has attracted worldwide attention. Currently, global efforts are underway to develop a rapid and sensitive technique to e...

Claims

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Application Information

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IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/01G01N21/658
Inventor 渠陆陆耿志琴韩彩芹王稳杨国海
Owner XUZHOU NORMAL UNIVERSITY
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