Graphene-based gas sensitive sensor material loaded with metal palladium and preparation and application thereof

A gas-sensing sensing material, graphene-based technology, applied in the field of graphene-based gas-sensing sensing materials and its preparation and application, can solve the problems affecting the sensor's working stability, affecting the accuracy, direct work, etc., to achieve excellent hydrogen Sensing performance, good catalytic reactivity, and enhanced adsorption performance

Inactive Publication Date: 2019-04-02
BEIJING GUANGKEBOYE SCI & TECH
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the above chemical reactions involve the adsorption of oxygen species in the environment, most sensors can only be used in aerobic environments, and are difficult to apply in anaerobic environments.
[0005] 2) Some semiconductor metal oxide materials (such as SnO2 materials) cannot directly work in the air at room temperature, and need to use direct heat or side heat to assist their work, which not only increases the energy consumption of the sensing element, but also fluctuates the heat source Influenced by external factors, it will further affect the working stability of the sensor
[0006] 3) Most semiconductor metal oxide materials (such as TiO2, ZnO materials), due to their intrinsic properties as semiconductor materials, lead to a very large body resistance, which will increase the overall device resistance in the subsequent development of circuit modules and instruments. Matching Difficulty, Hardware Cost and Test Accuracy
[0007] 4) Semiconductor metal oxide materials have excellent catalytic performance, which makes them widely used as gas-sensing sensing materials, but due to the limitations of the material itself, the gas selectivity of semiconductor sensors in practical applications is limited. Not good, it will be interfered by similar oxidizing gases, reducing gases and organic vapors, which will affect the accuracy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphene-based gas sensitive sensor material loaded with metal palladium and preparation and application thereof
  • Graphene-based gas sensitive sensor material loaded with metal palladium and preparation and application thereof
  • Graphene-based gas sensitive sensor material loaded with metal palladium and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The present embodiment provides the preparation of a metal palladium-supported graphene-based gas-sensing sensing material, comprising the following steps:

[0066] 1) Warm up 10mL of concentrated sulfuric acid (98%) to 90°C, slowly add 2g of K 2 S 2 o 8 , after stirring evenly, slowly add 2g P 2 o 5 Stir evenly, adjust the temperature to 80°C, add 1.8g graphene, and maintain the temperature for 30 minutes; dry at 60°C for 4-6 hours, then add deionized water, filter and wash until the filtrate is neutral, and dry at room temperature , to obtain pre-oxidized graphene;

[0067] 2) Slowly add the pre-oxidized graphene obtained in step 1) into 92mL of concentrated sulfuric acid (98%), slowly add 12g of KMnO at a temperature not higher than 10°C 4 , adjust the temperature to 35°C, and react for 2h;

[0068] 3) Dilute the reaction mixture in step 2) with 184 mL of deionized water, adjust the temperature to 60°C after dilution, and react for 2 hours;

[0069] Wherein, t...

Embodiment 2

[0078] This embodiment provides a kind of preparation of metal palladium-supported graphene-based gas-sensing sensing material, and the difference from Example 1 is only: the difference in reaction time in step 6);

[0079] Specifically, "Then add the reducing agent solution, and react at a temperature of 90°C for 6 hours to form a black suspension;"

[0080] Such as image 3 It is the SAED diagram of the Pd / rGO composite material prepared in this example.

Embodiment 3

[0082] This embodiment provides the preparation of a metal palladium-supported graphene-based gas-sensing sensing material. The difference from Example 1 is that the "surfactant" in step 6) is replaced by "CTAB" by PVP (polyvinylpyrrolidone). (cetyltrimethylammonium bromide)";

[0083] Specifically, "Prepare palladium chloride at a concentration of 0.5mol / L to prepare 2 mL of a dispersion, and mix it with the dispersion of graphene oxide described in step 5); stir for 30 minutes, then add CTAB (hexadecyltrimethyl ammonium bromide) according to the concentration of 1mg / mL, the 5mL dispersion liquid was prepared and continued to stir for 30min; then the reducing agent solution was added and reacted for 4h at a temperature of 90°C to form a black suspension”

[0084] Such as Figure 5It is the SEM image of the metal palladium supported graphene-based gas sensing material (Pd / rGO composite material) prepared in this embodiment. Among them, due to the addition of the surfactant C...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a graphene-based gas sensitive sensor material loaded with a metal palladium and a preparation and an application. The preparation comprises the following steps of: pre-oxidizing the graphene, and then performing oxidation treatment; reducing the oxidized graphene to reduced graphene oxide by an one-step reduction method; and simultaneously loading the metal palladium on the surface layer of the reduced graphene oxide to obtain a graphene-based gas sensitive sensor material. The graphene-based gas sensitive sensor material has excellent hydrogen sensing properties, exhibits 23% sensitivity to 1000 ppm hydrogen gas under normal-temperature and oxygen-free environment, and exhibits far better selectivity than other gases. The sensing material has a very wide application prospect due to the characteristics of being capable of operating in a normal-temperature and oxygen-free environment and high selectivity.

Description

technical field [0001] The invention belongs to the preparation and application of a semiconductor-type hydrogen sensor, in particular to a metal palladium-supported graphene-based gas-sensing sensing material and its preparation and application. Background technique [0002] Hydrogen is a common combustible gas. It is not only a common industrial raw material gas in production and life, but also a new type of secondary energy that is valued at present. It is widely used in petrochemical, electronic industry, metallurgy due to its unique physical and chemical properties Industry, food processing, float glass, fine organic synthesis, aerospace and other fields. However, hydrogen has a wider explosion range (4-75%) and lower ignition energy (0.019mJ) than other combustible gases. At the same time, due to the small molecular structure and light gas density of hydrogen, the possibility of leakage in actual production and life is higher. Therefore, in order to prevent the occur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 邬宝峰田陆
Owner BEIJING GUANGKEBOYE SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap