Au@MoS2-based localized surface plasma enhanced NO2 gas sensor and preparation method thereof

A gas sensor and plasma technology, applied in the direction of nanotechnology, instruments, scientific instruments, etc. for sensing, can solve the problems of high sensitivity real-time detection obstacles of sensors, doubts about the accuracy of detection results, slow recovery speed of sensors, etc. Good anti-humidity interference ability, improving gas sensing performance, improving recovery rate and stability

Active Publication Date: 2021-07-16
XIANGTAN UNIV
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Problems solved by technology

but due to NO 2 Gas is a strong oxidizing gas, which is adsorbed on the surface of two-dimensional materials. It is difficult to desorb without heating, resulting in a slow recovery speed of this type of gas sensor, which affects the use of the sensor. Detection or multi-point monitoring makes the accuracy of the detection results doubtful
The problem that traditional metal oxide sensors need to be heated also causes this type of sensor to be used in NO 2 Barriers to high-sensitivity real-time detection
[0004] TMDS materials such as MoS 2 considered to be a method that can detect NO at room temperature 2 Very promising material, but NO 2 Probing suffers from humidity interference at room temperature and difficulties in trace detection

Method used

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  • Au@MoS2-based localized surface plasma enhanced NO2 gas sensor and preparation method thereof
  • Au@MoS2-based localized surface plasma enhanced NO2 gas sensor and preparation method thereof
  • Au@MoS2-based localized surface plasma enhanced NO2 gas sensor and preparation method thereof

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preparation example Construction

[0053] Au@MoS based Au@MoS according to embodiments of the present invention 2 The localized surface plasmon enhanced NO 2 The preparation method of the gas sensor includes the following steps:

[0054] Preparation of MoS 2 Nanosheets, the MoS 2 The nanosheets have a hexagonal structure;

[0055] MoS with Au nanoparticles 2 Nanosheets are modified to obtain heterostructured Au@MoS 2 ;as well as

[0056] Au@MoS with heterostructure 2 Preparation of gas sensors as sensitive materials, specifically including: the heterostructure of Au@MoS 2 The powder was dispersed in an ethanol solvent to make a dispersion, and then in Al with multiple interdigitated electrodes 2 O 3 The dispersion liquid was drop-coated on the substrate, dried to form a sensitive film, and Au@MoS was prepared. 2 Gas sensors as sensitive materials;

[0057] Fixing the gas sensor in the first cavity of the detection box;

[0058] A light source is arranged in the second cavity of the detection box for...

Embodiment 1

[0081] MoS 2 Nanosheet preparation

[0082] Step 1-1, 0.97g sodium molybdate dihydrate (Na 2 MoO 4 ·2H 2 O) and 0.75 g of thioacetamide (CH 3 CSNH 2 ) dissolved in 80ml resistivity>18.4Ω / cm 2 ultrapure water;

[0083] Step 1-2, put the solution on a magnetic stirrer and stir for 40min at room temperature (25°C) to obtain a clear and transparent homogeneous solution;

[0084] Step 1-3, the obtained homogeneous solution is shaken for 10min in an ultrasonic oscillator with a power of 250W;

[0085] Step 1-4, transfer the solution to a 100ml polytetrafluoroethylene lined autoclave, put it into a vacuum drying oven and continue heating at 200°C for 36h;

[0086] Step 1-5, wait for the solution in the reactor to be cooled to room temperature (25°C) naturally;

[0087] Steps 1-6, use a centrifuge to collect MoS from the resulting mixed solution at a centrifugal speed of 7500 rad / min 2 Precipitate, wash with deionized water and absolute ethanol for 2 to 3 times by centrifuga...

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Abstract

The invention provides a localized surface plasma enhanced NO2 gas sensor based on Au@MoS2 and a preparation method of the localized surface plasma enhanced NO2 gas sensor based on Au@coated MoS2, and the preparation method comprises the following steps: preparing a MoS2 nanosheet which has a hexagonal structure; modifying the MoS2 nanosheet by adopting Au nanoparticles to obtain Au@MoS2 with a heterostructure; and preparing the gas sensor by taking the Au@MoS2 with the heterostructure as a sensitive material. fixedly arranging the gas sensor in the first cavity of the detection box; and arranging a light source in the second cavity of the detection box wherein the light source is used for emitting light with the wavelength range of 530 nm towards the gas sensor during detection, a light-assisted environment is provided, and a channel for gas to flow through is arranged. According to the gas sensor prepared by the invention, the local surface plasma resonance effect of the gold nanoparticles is introduced, so that the prepared NO2 gas sensor is low in detection limit and high in moisture interference resistance, and the stability and the recovery rate are both superior to those of a traditional sensor.

Description

technical field [0001] The present invention relates to NO 2 The field of gas sensor technology, in particular to a kind of Au@MoS-based 2 The localized surface plasmon enhanced NO 2 Gas sensor and preparation method thereof. Background technique [0002] NO 2 (Nitrogen dioxide), as a toxic gas that harms human health and pollutes the environment, is produced in large quantities along with the process of industrialization and exists in the environment. Its extremely low concentration will stimulate the eyes and respiratory system of the human body, and even cause Permanent injury, causing severe respiratory distress syndrome, pulmonary fibrosis, neurasthenic syndrome, etc., real-time detection of NO 2 The gas concentration (ppm) is of great significance for environmental protection and human health protection. [0003] NO used in the prior art 2 Gas sensors, mainly metal oxide semiconductor sensors, this type of sensor integrates a micro heater and a sensing surface to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/552B82Y15/00B82Y40/00
CPCG01N21/554B82Y15/00B82Y40/00Y02A50/20
Inventor 张勇陈佩胡金勇曹觉先
Owner XIANGTAN UNIV
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