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Trace CO Raman detection method with Au (at) M (at) CeO2 as enhanced substrate

A detection method and trace technology, applied in Raman scattering, measurement devices, air quality improvement, etc., can solve problems affecting signal repeatability and stability, uneven distribution of hot spots, uneven particle size and morphology, etc. , to achieve the effect of high Raman enhancement effect, broaden the research application field, and the synthesis process is simple and fast.

Pending Publication Date: 2022-05-24
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] With the continuous development and improvement of SERS technology, the high-performance, uniform and stable SERS substrate technology is gradually becoming mature. However, due to the huge gap between the actual catalytic system and SERS detection, and the size and shape of the synthesized particles Uniformity leads to uneven distribution of hot spots, which affects signal repeatability and stability

Method used

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  • Trace CO Raman detection method with Au (at) M (at) CeO2 as enhanced substrate
  • Trace CO Raman detection method with Au (at) M (at) CeO2 as enhanced substrate
  • Trace CO Raman detection method with Au (at) M (at) CeO2 as enhanced substrate

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Embodiment 1

[0051] One is Au@Pt@CeO 2 As a Raman detection method of trace CO as an enhanced substrate, the specific steps are as follows:

[0052] (1) the gold nanometer that uses is the nanometer gold particle that the particle diameter that the sodium citrate one-step method is rapidly synthesized is 55nm;

[0053] (2) Au@Pt core-shell with a shell thickness of 2 nm was synthesized by adding 1.2 ml of 10 mM ascorbic acid, 2 ml of 1 mM chloroplatinic acid solution, and 30 ml of gold nanoparticles with a size of 55 nm at a constant temperature of 80 °C in a water bath. structured nanoparticles;

[0054] (3) washing away the ascorbic acid and sodium citrate that above-mentioned inner core seeds were introduced during synthesis by centrifugal washing, and then dispersed in the 0.025M surfactant CTAB solution;

[0055] (4) Add 100 microliters of 0.01M EDTA-ammonia surface modifier and 100 microliters of 0.01M cerium nitrate solution precursor, and then hydrolyze them in a water bath at 90...

Embodiment 2

[0063] One is Au@Pd@CeO 2 As a Raman detection method of trace CO as an enhanced substrate, the specific steps are as follows:

[0064] (1) the gold nanometer that uses is the nanometer gold particle that the particle diameter that the sodium citrate one-step method is rapidly synthesized is 55nm;

[0065] (2) Au@Pt core with a shell thickness of 2 nm was synthesized by adding 1.2 ml of 10 mM ascorbic acid, 2 ml of 1 mM chloropalladic acid solution, and 30 ml of gold nanoparticles with a size of 55 nm at a constant temperature of 4 °C in an ice bath. shell-structured nanoparticles;

[0066] (3) washing away the ascorbic acid and sodium citrate that above-mentioned inner core seeds were introduced during synthesis by centrifugal washing, and then dispersed in the 0.025M surfactant CTAB solution;

[0067] (4) Add 100 microliters of 0.01M EDTA-ammonia surface modifier and 100 microliters of 0.01M cerium nitrate solution precursor, and then hydrolyze them in a water bath at 90°C...

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Abstract

The invention discloses a Raman detection method for trace CO by taking Au (at) M (at) CeO2 as an enhanced substrate, M is Pt or Pd, and the Raman detection method specifically comprises the following steps: (1) synthesizing core seed Au (at) M core-shell structure nanoparticles; (2) centrifugally cleaning the inner core seeds, and dispersing the inner core seeds in a surfactant CTAB (Cetyltrimethyl Ammonium Bromide) solution; (3) preparing Au (at) M (at) CeO2 core-shell structure nanoparticles; (4) washing and concentrating the Au (at) M (at) CeO2 core-shell structure nanoparticles, and dripping the Au (at) M (at) CeO2 core-shell structure nanoparticles on a clean silicon wafer; (5) applying different reaction atmospheres to carry out in-situ Raman spectrum research to detect SERS signals; and (6) analyzing and comparing the SERS signal obtained in the step (5) to obtain the catalytic reaction process on the multilayer core-shell nanostructure. According to the invention, cerium oxide is modified on the surface of the Au (at) M core-shell nanostructure to construct interface existence of metal-CeO2, so that the existence of trace CO in a to-be-detected system can be sensitively detected, and CO can be easily desorbed by switching into oxygen, so that the substrate can be repeatedly and stably used for multiple times.

Description

technical field [0001] The invention belongs to the technical field of Raman detection, and in particular relates to a kind of Au@M@CeO 2 Raman detection method for trace CO as an enhanced substrate. Background technique [0002] Carbon monoxide (CO) is a colorless, odorless, and toxic gas. The main purpose of CO monitoring is to prevent people from being poisoned by excessive CO concentrations. Its content detection has always been the focus of public systems such as conventional closed systems such as underground garages, air raid shelters, and so on. [0003] Raman spectroscopy is one of the most commonly used techniques for in situ characterization of heterogeneous catalysis, which can provide rich molecular structural information, but its low sensitivity makes it difficult to characterize trace amounts of adsorbed species on the catalyst surface. These shortcomings significantly limit its applications. Surface-enhanced Raman spectroscopy (SERS) has extremely high sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/658G01N21/01Y02A50/20
Inventor 李剑锋魏笛野
Owner XIAMEN UNIV
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