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Detection method and application of ultralow-temperature enhanced Raman spectrum signal

A detection method and Raman spectroscopy technology, applied in the field of material spectroscopy, to achieve high SERS detection sensitivity, good universality, and the effect of reducing ambient temperature

Active Publication Date: 2020-08-25
CIXI INST OF BIOMEDICAL ENG NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods are all based on chemical synthesis. Can the SERS performance of metal oxides be improved by simple physical methods, such as changing the test temperature?

Method used

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  • Detection method and application of ultralow-temperature enhanced Raman spectrum signal
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  • Detection method and application of ultralow-temperature enhanced Raman spectrum signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1 Low temperature enhanced SERS performance of defect state ZnO metal oxide nanoparticles

[0065] Under the condition of low temperature and room temperature, the defect-state flaky ZnO metal oxide nanoparticles with a particle size of 350nm were detected by photoluminescence spectroscopy at room temperature and low temperature, and it was found that the defect-state photoluminescence peak was significantly enhanced at low temperature.

[0066] The ZnO metal oxide nanoparticles in the defect state were mixed and adsorbed with different concentrations of rhodamine R6G molecules for 4 hours; then at low temperature, the Raman spectrum was detected. Excitation wavelengths are 488nm, 514nm, 532nm, 633nm, 647nm, 785nm. At low temperature, the SERS signal of rhodamine R6G molecule was significantly enhanced. The best detection sensitivity is 10 -8 M.

[0067] In the above steps, the room temperature is 293K, and the low temperature is 287K-77K, and a measurement i...

Embodiment 2

[0075] Example 2 Low temperature enhanced defect state TiO 2 SERS performance of metal oxide nanoparticles

[0076] Under the condition of low temperature and room temperature, the defect state TiO with particle size of 500nm 2 Metal oxide nanoparticles were detected by photoluminescence spectroscopy at room temperature and low temperature, and it was found that at low temperature, the defect state of TiO 2 The photoluminescence peak of metal oxide nanoparticles is obviously enhanced.

[0077] The temperatures in the above steps are 293K, 243K, 207K, 197K, 167K, 137K, 107K, 77K, respectively.

[0078] Defect state TiO 2 The metal oxide nanoparticles were mixed and adsorbed with different concentrations of rhodamine R6G molecules for 4 hours; then at low temperature, the Raman spectrum was detected. Excitation wavelengths are 488nm, 514nm, 532nm, 633nm, 647nm, 785nm. At low temperature, the SERS signal of rhodamine R6G molecule was significantly enhanced. The best detecti...

Embodiment 3

[0086] Example 3 Low temperature enhanced defect state Cu 2 SERS performance of O metal oxide nanoparticles

[0087] Under the condition of low temperature and room temperature, the defect state Cu with particle size of 500nm 2 O metal oxide nanoparticles were detected by photoluminescence spectroscopy at room temperature and low temperature, and it was found that at low temperature, the defect state Cu 2 The photoluminescence peak of O metal oxide nanoparticles is obviously enhanced.

[0088] The temperatures in the above steps are 293K, 243K, 207K, 197K, 167K, 137K, 107K, 77K, respectively.

[0089] Defect state Cu 2 O metal oxide nanoparticles and rhodamine R6G molecules of different concentrations were mixed and adsorbed for 4 hours; then, at low temperature, the Raman spectrum was detected. Excitation wavelengths are 488nm, 514nm, 532nm, 633nm, 647nm, 785nm. At low temperature, the SERS signal of rhodamine R6G molecule was significantly enhanced. The best detection ...

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Abstract

The invention discloses a detection method and application of an ultralow-temperature enhanced Raman spectrum signal. The method comprises the following steps: adsorbing a substance to be detected ona surface enhanced Raman spectrum substrate, and carrying out laser Raman spectrum test on the substance to be detected under the condition of 0.1-287K; wherein the surface enhanced Raman spectrum substrate is semiconductor nanoparticles; the semiconductor nanoparticles including metal oxide nanoparticles, and the metal oxide nanoparticles having surface defects. The method provided by the invention has very good universality and very high SERS detection sensitivity.

Description

technical field [0001] The application relates to a detection method and application of an ultra-low temperature enhanced Raman spectrum signal, which belongs to the technical field of material spectroscopy. Background technique [0002] As nanomaterials science and technology have made great progress in the field of materials, various application technologies that rely on nanomaterials science have also developed rapidly. It is well known that the size and shape of nanomaterials have an important impact on their physical and chemical properties. Therefore, it has always been a hot spot for researchers to prepare novel nanomaterials with different morphologies through synthetic methods, and then to improve and enhance the corresponding optical, thermal, and electrical properties of the materials. In recent years, due to their unique properties, metal oxide nanomaterials have shown great application potential in the field of optics, such as the field of surface-enhanced Rama...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 林杰吴爱国
Owner CIXI INST OF BIOMEDICAL ENG NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
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