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Ammonia gas sensor loaded with platinum particles and preparation method thereof

A technology of ammonia sensor and particles, which is applied in the direction of chemical instruments and methods, instruments, scientific instruments, etc., can solve the problems of too many researches on the gas-sensing performance of ammonia gas, and achieve the improvement of responsiveness and reaction speed, and excellent gas-sensing performance , the effect of changing the conductivity

Inactive Publication Date: 2018-11-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method focuses on the electrochemical performance of the reduced graphene oxide composite, and has not conducted much research on its ammonia gas sensing performance

Method used

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  • Ammonia gas sensor loaded with platinum particles and preparation method thereof
  • Ammonia gas sensor loaded with platinum particles and preparation method thereof
  • Ammonia gas sensor loaded with platinum particles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. A method for preparing an ammonia gas-sensitive material loaded with platinum particles, comprising the steps of:

[0057] (1) Preparation of graphene film: select 25 μm thick copper foil as the growth substrate, use acetone, absolute ethanol, and deionized water to clean the copper foil in sequence, and put the copper foil into chemical vapor deposition equipment after drying. Introduce 400sccm argon and 20sccm hydrogen as the gas source for copper foil treatment, and perform annealing treatment on the copper foil at 1000°C for 2 hours. After the end, it enters the natural cooling process, and 400 sccm argon is introduced as a protective gas source. After cooling down, take out the copper foil with graphene, and then press the graphene / copper foil and PET / silica gel with a hot press at 60°C, and put the PET / graphene / copper foil in a concentration of 2.5M Soak in ferric chloride solution for 4 hours to completely dissolve the copper foil, wash it in deionized water ...

Embodiment 2

[0062] 1. A method for preparing an ammonia gas-sensitive material loaded with platinum particles, the same as in Example 1, the difference is that steps (2) and (3) are not included, that is, the ammonia gas-sensitive material of the present embodiment has not passed through ultraviolet ozone modified, and there is no graphene film loaded with platinum particles on the surface.

[0063] 2. A method for preparing an ammonia sensor, which is the same as that in Embodiment 1, except that the gas-sensitive material for the sensor is prepared in this embodiment.

Embodiment 3

[0065] 1. A method for preparing an ammonia gas-sensitive material loaded with platinum particles, the same as in Example 1, except that step (3) is not included, that is, the ammonia gas-sensitive material of the present embodiment has only been modified by ultraviolet ozone, But there is no graphene film loaded with platinum particles on the surface.

[0066] 2. A method for preparing an ammonia sensor, which is the same as that in Embodiment 1, except that the gas-sensitive material for the sensor is prepared in this embodiment.

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Abstract

The invention relates to an ammonia gas sensor loaded with platinum particles and a preparation method thereof, and belongs to the field of gas sensors. A gas sensitive material is composed of the platinum particles and a graphene film. The platinum particles are loaded on the graphene film carrier. The method includes the following steps: (1) preparing the graphene film and keeping for later use;(2) using ultraviolet ozone to modify the graphene film obtained in the step (1) and keeping for later use; and (3) impregnating the modified graphene film in the step (2) in a platinum chloride solution, and heating and insulating the graphene film after the impregnation so as to decompose chloroplatinic acid into the platinum particles to obtain the ammonia gas sensitive material loaded with the platinum particles on the graphene film. According to the preparation method, through the ultraviolet ozone treatment, the graphene film is firstly modified by introducing an oxygen-containing functional group, increasing defect sites and adsorption sites of the film, changing resistance characteristics and wettability of the film and loading the platinum particles onto the graphene film. The gas sensitive sensor prepared according to the method has excellent room temperature response performance to ammonia gas.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to an ammonia gas sensor loaded with platinum particles and a preparation method thereof. Background technique [0002] Ammonia is an extremely important industrial raw material, widely used in chemical and pharmaceutical fields, but for the human body, ammonia is a highly irritating and toxic gas, and low concentrations of ammonia can damage the eyes and The respiratory tract is irritated, and high concentrations of ammonia can cause strong irritation to the human body and seriously threaten life and health. Therefore, the preparation of a new type of ammonia sensor with high sensitivity, fast response, and stable operation at room temperature is of great significance for the monitoring of living environment and the health of workers in related industries. [0003] At present, most common ammonia sensors are based on metal oxide materials, such as zinc oxide and tin dioxide. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C01B32/194
CPCC01B32/194G01N27/125
Inventor 慈立杰陈靖桦彭瑞芹聂祥坤
Owner SHANDONG UNIV
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