Optical fiber hydrogen sensor based on au@pd nanoparticles and its preparation method and application

A nanoparticle and sensor technology, which is applied in the field of optical fiber hydrogen sensor based on Au@Pd nanoparticles and its preparation, can solve the problems that the comprehensive performance of the sensor cannot be improved, the diffusion distance of hydrogen atoms can be reduced, and the signal modulation ability can be weakened, etc., to achieve Good application prospects, small zero drift, and the effect of improving overall performance

Active Publication Date: 2021-12-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because the thinner sensitive film reduces the diffusion distance of hydrogen atoms, reduces the time for the hydrogen permeation reaction to reach equilibrium and thus improves the response speed, but also correspondingly reduces the total amount of sensitive materials involved in optical signal coupling modulation, weakening the The signal modulation ability reduces the sensitivity, so that the overall performance of the sensor cannot be improved

Method used

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  • Optical fiber hydrogen sensor based on au@pd nanoparticles and its preparation method and application
  • Optical fiber hydrogen sensor based on au@pd nanoparticles and its preparation method and application
  • Optical fiber hydrogen sensor based on au@pd nanoparticles and its preparation method and application

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Embodiment 1

[0039] Provided is an optical fiber hydrogen sensor based on Au@Pd nanoparticles, comprising a flexible substrate, a nano-grating structure on the surface of the flexible substrate, and an Au@Pd nano-particle monolayer film covering the surface of the nano-grating structure. Among them, the gold core diameter in Au@Pd nanoparticles is 12nm; the average thickness of the palladium shell is 3nm; the flexible substrate is a single-layer structure with a thickness of 0.5mm; the nano-grating structure is a two-dimensional structure with a period of 416.6nm and a groove depth of 110nm, the duty cycle is 50%, and the groove width is 208nm.

[0040] The hydrogen-sensitive material adopts a gold-palladium core-shell structure nanoparticle monolayer film, which is no longer a continuous film. After repeated use, the continuous film is prone to delamination and rupture, causing the film to fail. Large zero drift and poor stability. However, the present invention greatly increases the con...

Embodiment 2

[0044] Provide an optical fiber hydrogen sensor with the same embodiment 1, the difference is: the size of the gold core in the Au@Pd nanoparticle film is 12nm, and the average thickness of the palladium shell is 6nm.

[0045] Figure 5 It is the response curve of the optical fiber hydrogen sensor in this embodiment, as shown in the figure: 0.1% hydrogen gas is introduced, the average response speed is 10s, the average response amplitude is 18mV, the zero point drift is 0.2mV, and the stability is excellent.

Embodiment 3

[0047] Provide an optical fiber hydrogen sensor with the same embodiment 1, the difference is: the size of the gold core in the Au@Pd nanoparticle film is 40nm, and the average thickness of the palladium shell is 3nm.

[0048] Image 6 It is the response curve of the optical fiber hydrogen sensor in this embodiment. The figure shows that 0.1% hydrogen gas is injected, the average response speed is 8s, the average response amplitude is 20mV, the zero point drift is 1mV, and the stability is good.

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Abstract

The invention relates to an optical fiber hydrogen sensor based on Au@Pd nanoparticles and its preparation method and application. An optical fiber hydrogen sensor based on Au@Pd nanoparticles is provided, including a flexible substrate and an Au@Pd nanoparticle monolayer film, wherein the surface of the flexible substrate is printed with a nano-grating structure, and the Au@Pd nanoparticle monolayer film is covered on a nano Grating structured surface. Its preparation is as follows: (1) Au@Pd nanoparticles are made hydrophobic and dropped onto the surface of ultrapure water, and the flexible substrate is inserted into the liquid surface; (2) Au@Pd nanoparticles are gathered onto the flexible substrate to print From the area with the nano-grating structure to the mirror surface with metallic luster, it will leave the liquid surface at a speed of 0.1mm / s after 10s, and peel off the flexible substrate after evaporation. Using the above-mentioned optical fiber hydrogen sensor for hydrogen detection has fast response speed and good stability, and the response speed can reach 3s when measuring the hydrogen concentration of 0.1%.

Description

technical field [0001] The invention relates to the technical field of optical fiber hydrogen sensors, in particular to an optical fiber hydrogen sensor based on Au@Pd nanoparticles and its preparation method and application. Background technique [0002] With its unique advantages, hydrogen has become one of the most important clean energy carriers in the 21st century. However, the chemical nature of hydrogen is active. During the production, storage, transportation and filling of hydrogen energy, the leakage of hydrogen can easily lead to major accidents, so hydrogen leakage monitoring is essential. The optical fiber hydrogen sensor is a sensor that uses light as the information transmission medium of hydrogen concentration. It has unique advantages such as intrinsic safety, small size and easy remote measurement. It is suitable for real-time monitoring of hydrogen concentration in various dangerous and complex environments. [0003] The existing hydrogen sensor types mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25B01J13/02B82Y15/00B82Y30/00B82Y40/00
CPCB01J13/02B82Y15/00B82Y30/00B82Y40/00G01N21/25
Inventor 宋涵蔡琪辉刘明尧王启东
Owner WUHAN UNIV OF TECH
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