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Chemical enhancement SERS substrate preparation method for regulating oxide defects

An oxide and defect technology, applied in the field of spectral analysis technology detection, can solve the problem of low electromagnetic enhancement factor, and achieve the effect of easy operation and good repeatability

Inactive Publication Date: 2019-04-16
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although semiconductor material substrates exhibit a certain degree of SERS activity, their electromagnetic enhancement factors are generally low (only 10 2 -10 3 ), far below the requirements of practical applications

Method used

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  • Chemical enhancement SERS substrate preparation method for regulating oxide defects
  • Chemical enhancement SERS substrate preparation method for regulating oxide defects
  • Chemical enhancement SERS substrate preparation method for regulating oxide defects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Adding 2wt% lithium powder to prepare MoO with different concentrations of oxygen-rich defects 2-x (0<x<1) particles, including the following steps:

[0025] Dissolve 1mmol of molybdenum acetylacetonate in a mixed solution of 30ml of absolute ethanol, 10ml of isopropanol, and 10ml of deionized water, and stir magnetically for 2 hours to form a molybdenum source precursor; then transfer the precursor to a polytetrafluoroethylene lining, Seal it in a stainless steel reaction kettle, and place it in a blast drying oven at 180 degrees Celsius to keep warm for 8 hours; finally, after cooling to room temperature, transfer the liquid to a centrifuge tube, wash and centrifuge it with deionized water and absolute ethanol for 3 times, and place it in a vacuum at 60 degrees Celsius. Dry in a drying oven for 6 hours to obtain a uniform MoO 2 Nanospheres; Take 0.5g MoO 2 Add 1ml of dimethyl carbonate to the powder first, then add 10mg of lithium powder in an argon-protected glove ...

Embodiment 2

[0027] Adding 4wt% lithium powder to prepare MoO with different concentrations of oxygen-rich defects 2-x (0

[0028] Dissolve 1mmol of molybdenum acetylacetonate in a mixed solution of 30ml of absolute ethanol, 10ml of isopropanol, and 10ml of deionized water, and stir magnetically for 2 hours to form a molybdenum source precursor; then transfer the precursor to a polytetrafluoroethylene lining, Seal it in a stainless steel reaction kettle, and place it in a blast drying oven at 180 degrees Celsius to keep warm for 8 hours; finally, after cooling to room temperature, transfer the liquid to a centrifuge tube, wash and centrifuge it with deionized water and absolute ethanol for 3 times, and place it in a vacuum at 60 degrees Celsius. Dry in a drying oven for 6 hours to obtain a uniform MoO 2 Nanospheres; Take 0.5g MoO 2 Add 1ml of dimethyl carbonate to the powder first, then add 21mg of lithium powder in an argon-protected glove ...

Embodiment 3

[0030] Adding 6wt% lithium powder to prepare MoO with different concentrations of oxygen-rich defects 2-x (0

[0031] Dissolve 1mmol of molybdenum acetylacetonate in a mixed solution of 30ml of absolute ethanol, 10ml of isopropanol, and 10ml of deionized water, and stir magnetically for 2 hours to form a molybdenum source precursor; then transfer the precursor to a polytetrafluoroethylene lining, Seal it in a stainless steel reaction kettle, and place it in a blast drying oven at 180 degrees Celsius to keep warm for 8 hours; finally, after cooling to room temperature, transfer the liquid to a centrifuge tube, wash and centrifuge it with deionized water and absolute ethanol for 3 times, and place it in a vacuum at 60 degrees Celsius. Dry in a drying oven for 6 hours to obtain a uniform MoO 2 Nanospheres; Take 0.5g MoO 2 First add 1ml of dimethyl carbonate to the powder, then add 32mg of lithium powder in an argon-protected glove ...

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Abstract

The invention discloses a chemical enhancement SERS substrate preparation method for regulating oxide defects. The method comprises the steps that a hydrothermal synthesis method is used for synthesizing MoO2 nanosphere powder; and 2, 2wt%, 4wt%, 6wt% and 8wt% of lithium powder is added, and MoO2-x(0<x<1) materials with different oxygen-rich vacancy defect concentrations are obtained. According tothe MoO2-x spherical nano-materials, the average particle diameter is 70 nm, the detection limit of an SERS substrate prepared by regulating the oxide defects through lithium reduction on R6G can reach 10<-7> M, and the introduced oxygen vacancy concentration can be regulated through the mass ratio of the added lithium powder, and therefore the Raman enhancement effect of the oxide SERS substrateis controllably enhanced. The preparation method is simple and convenient, obtained materials are uniform in morphology, the Raman enhancement effect is excellent, and great potential in enhancing the Raman enhancement effect of the oxide SERS substrate is achieved.

Description

technical field [0001] The invention relates to a method for preparing a chemically enhanced SERS substrate that uses metal lithium reduction to regulate oxide defects at room temperature, and belongs to the field of spectral analysis technology detection. Background technique [0002] Surface-enhanced Raman scattering (SERS) is a surface-sensitive resonance extension of standard Raman scattering (RS), which is a vibrational spectroscopy technique. The observation of SERS can be traced back to a strong Raman signal observed by Fleischmann et al. on the rough surface of silver electrodes in 1974. In 1977, SERS was defined as the Raman enhancement effect observed on the surface of noble metals. Since then, metal material substrates with high sensitivity and high selectivity have been induced in various application fields such as chemical identification, biosensing, environmental analysis, and homeland security. However, metal nanomaterials have the disadvantages of high cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 梁培曹宇汪柯佳
Owner CHINA JILIANG UNIV
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