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Synthesis method of ultrathin MoO2 nanosheet with SERS (Surface Enhanced Raman Scattering) effect and application of synthesis method

A synthesis method and nanosheet technology, applied in the field of detection, can solve the problems of weak Raman signal, application limitation, low sensitivity, etc., and achieve the effects of strong repeatability, easy promotion and low price

Inactive Publication Date: 2019-08-23
CHINESE ACAD OF INSPECTION & QUARANTINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Raman spectroscopy is a spectroscopic analysis method based on the Raman scattering effect, which can provide fingerprint information of chemical molecular structures, but its application is greatly limited due to weak Raman signals and low sensitivity.
Using noble metals as the detection enhancement substrate, placing the analyte molecules on the rough noble metal surface can greatly enhance the Raman signal of the analyte molecules, but due to the high price of noble metals, it largely hinders surface-enhanced Raman spectroscopy. learning development

Method used

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  • Synthesis method of ultrathin MoO2 nanosheet with SERS (Surface Enhanced Raman Scattering) effect and application of synthesis method
  • Synthesis method of ultrathin MoO2 nanosheet with SERS (Surface Enhanced Raman Scattering) effect and application of synthesis method

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Experimental program
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Effect test

Embodiment 1

[0027] Ultrathin flexible MoO 2 The synthesis steps of nanosheets are as follows:

[0028] Mix 50 mL of water with 20 mL of tert-butanol, add 0.264 g of molybdenum hexacarbonyl, and stir on a magnetic stirrer for 2 hours.

[0029] Transfer the resulting solution into a Teflon-lined high-pressure reactor, place it in an oven and heat it up to 220°C, keep it warm for 10 hours, then cool it down to room temperature naturally, pour out the supernatant in the reactor, and precipitate through 10000r / m Centrifuge for min, wash with water and ethanol three times.

[0030] The obtained product was characterized by XRD, SEM, TEM and EDS, etc., and was determined to be MoO with a sheet-like structure. 2 nanomaterials. see figure 1 ( figure 1 The scale in the lower left corner is 20nm), and the resulting ultrathin flexible MoO 2 Transmission electron micrograph of the nanosheets, whose cross-sectional lattice fringes show a thickness of only 5-10 atomic layers.

Embodiment 2

[0032] Mix 50 mL of water with 25 mL of tert-butanol, add 0.364 g of molybdenum hexacarbonyl, and stir on a magnetic stirrer for 2 hours.

[0033] Transfer the obtained solution into a Teflon-lined high-pressure reactor, place it in an oven and heat it up to 180°C, keep it warm for 16 hours, then cool it down to room temperature naturally, pour out the supernatant in the reactor, and precipitate through 10000r / m Centrifuge for min, wash with water and ethanol three times.

[0034] The obtained product was characterized by XRD, SEM, TEM and EDS, etc., and was determined to be MoO with a sheet-like structure. 2 nanomaterials.

Embodiment 3

[0036] There is the synthetic method of the ultrathin MoO2 nanosheet of SERS effect, comprises the steps:

[0037] 1) First mix tert-butanol with water, stir on a magnetic stirrer for 2 hours to obtain a mixed solution, then add molybdenum hexacarbonyl to the mixed solution, and stir evenly; the mass ratio of tert-butanol to water is 3: 5. The mass ratio of molybdenum hexacarbonyl to the mixed liquid is 1:160.

[0038] 2) The mixture obtained in step 1) was placed in a Teflon-lined autoclave, heated to 240° C. in an oven, maintained for 18 hours, and then naturally cooled to room temperature.

[0039] The obtained product was characterized by XRD, SEM, TEM and EDS, etc., and was determined to be MoO with a sheet-like structure. 2 nanomaterials.

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Abstract

The invention discloses a synthesis method of an ultrathin MoO2 nanosheet with an SERS (Surface Enhanced Raman Scattering) effect and application of the synthesis method. The synthesis method comprises the following step: by taking molybdenum hexacarbonyl as a raw material, and tertiary butanol as a solvent and a structure template, carrying out synthesis under a medium temperature condition. Thesynthesis method which is disclosed by the invention and has solvothermal is simple and reliable, low in price, good in repeatability and easy to popularize. The ultrathin MoO2 nanosheet synthesized by using the synthesis method disclosed by the invention can be directly used as a Raman detection substrate and is capable of intensifying a Raman signal for 106 times.

Description

technical field [0001] The invention belongs to the technical field of detection, in particular to an ultra-thin MoO used for Raman spectrum detection 2 Preparation methods and applications of nanosheets. Background technique [0002] Raman spectroscopy is a spectroscopic analysis method based on the Raman scattering effect, which can provide fingerprint information of chemical molecular structures, but its application is greatly limited due to weak Raman signals and low sensitivity. Using noble metals as the detection enhancement substrate, placing the analyte molecules on the rough noble metal surface can greatly enhance the Raman signal of the analyte molecules, but due to the high price of noble metals, it largely hinders surface-enhanced Raman spectroscopy. learning development. Using metal oxides as Raman-enhanced substrates not only exhibits a Raman-enhancing effect similar to noble metals, but also has higher chemical stability and lower production costs, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02G01N21/65B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G39/02C01P2002/72C01P2002/85C01P2004/03C01P2004/04C01P2004/64G01N21/658
Inventor 席广成田峥杜瑞峰
Owner CHINESE ACAD OF INSPECTION & QUARANTINE
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