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Preparation method of gas sensitive material namely multi-metal nano crystal modified metal oxides

A multi-metal and gas-sensitive material technology, applied in nanotechnology, nanotechnology, material electrochemical variables, etc., can solve the problems of limited performance improvement and lower detection limit of metal oxide sensitive materials

Active Publication Date: 2016-09-07
上海摇橹仪器设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it has been reported that the use of single metal nanocrystals can improve the response sensitivity of metal oxide sensitive materials and reduce the detection limit (Sensors and Actuators B-Chemical, 2016, 224, 193-200; Langmuir, 2015, 31, 13247- 13256; Nanoscale, 2015, 7, 14872-14880), however, the performance improvement of single metal nanocrystals on metal oxide sensitive materials is still very limited, especially in terms of specific response to target detection gases

Method used

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  • Preparation method of gas sensitive material namely multi-metal nano crystal modified metal oxides
  • Preparation method of gas sensitive material namely multi-metal nano crystal modified metal oxides
  • Preparation method of gas sensitive material namely multi-metal nano crystal modified metal oxides

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Multi-element metal nanocrystals are PdPd (see attached figure 1 ), the oxide semiconductor material is SnO 2 Nanoparticles

[0023] In this example, PtPd nanocrystals modified SnO 2 The nanoparticles are modified in situ:

[0024] Weigh a certain amount of pre-prepared SnO 2 The nanoparticles were uniformly dispersed in 10 mL of ethylene glycol under ultrasound, and the resulting suspension was transferred to a 25 mL flask, and refluxed at 100 °C for 30 min. Then weigh a certain amount of polyvinylpyrrolidone (PVP) and add it to the above suspension, and continue to reflux for 30 min after the dissolution is complete. Weigh a certain amount of chloroplatinic acid (H 2 PtCl 6 ·6H 2 O) and palladium chloride (PdCl 2 ) Dissolve in 5 mL of ethylene glycol, and slowly add dropwise to the flask after it is completely dissolved. The solution turns black when the temperature is programmed to 180 °C. Wash the resulting precipitate with ethanol and deionized water. Dry under vacuum ...

Embodiment 2

[0028] Multi-element metal nanocrystals are PtNi (see attached image 3 ), the oxide semiconductor material is SnO 2 Nano stave

[0029] PtNi nanocrystals modified SnO in this example 2 Nanorods use a distributed modification method:

[0030] First transfer 5 mL of oleylamine into a 25 mL flask, reflux at 80 °C for 30 min, then weigh a certain amount of PVP into the flask, and continue reflux for 30 min. Weigh a certain amount of platinum chloride (PtCl 2 ), nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) Dissolve separately in 5 mL of oleylamine, slowly add dropwise to the flask after it is completely dissolved, control the program to raise the temperature to 160 °C, and then the solution turns black. Wash the resulting precipitate with ethanol and deionized water. Dry under vacuum at 60 °C to obtain PtNi nanocrystals.

[0031] The specific modification method is: Weigh PtNi nanocrystals and SnO at 0.5% mass fraction 2 Nanorods were dispersed in ethanol ultrasonically for 1 h, and then dried ...

Embodiment 3

[0035] Multi-element metal nanocrystals are Ag@AgAu (see attached Figure 5 ), the oxide semiconductor material is ZnO nanoparticles

[0036] In this example, Ag@AgAu nanocrystals modified ZnO nanoparticles using a step-by-step modification method: first pipette 10 mL of oleic acid into a 25 mL flask, reflux at 100 °C for 30 min, and then weigh a certain amount Amount of silver nitrate (AgNO 3 ) Add to the flask, continue to reflux for 30 minutes, program the temperature to 160 °C, the solution turns black, and centrifuge to wash the resulting precipitate. Then redisperse the resulting black precipitate in 5 mL of oleic acid, reflux for 10 min at 100 °C, weigh a certain amount of 2-MEPA in this suspension, and continue to reflux for 20 min; Amount of chloroauric acid (HAuCl 4 ·4H 2 O) and silver nitrate (AgNO 3 ) Dissolve in 5 mL of oleic acid, and slowly add dropwise to the flask after it is completely dissolved. After the temperature is programmed to 180 °C, the solution turns ...

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Abstract

The invention relates to a preparation method of a gas sensitive material namely multi-metal nano crystal modified metal oxides. The preparation method is characterized in that multi-metal nano crystals are taken as the key material, then the multi-metal nano crystals are assembled on the surface of a metal oxide sensitive material through a one-step in-situ synthesis method or a step-by-step modification method, the physical properties, chemical properties, and electric characteristics of original sensitive material can be changed, and thus the preparation method is worthy to research. According to the preparation method, the composition and structure of multi-metal nano crystals are optimized, then the multi-metal nano crystals are modified on the surface of a gas sensitive material (metal oxide), the parameters such as absorption strength of substances absorbed on the surface, active centers, and the like, are prominently improved, the sensitivity responding to gas to be detected is improved therefore, and specific responding to target gas is realized.

Description

Technical field [0001] The invention relates to a method for preparing a multi-element metal nanocrystal modified metal oxide gas sensitive material, and belongs to the technical field of nano gas sensitive material manufacturing technology. technical background [0002] Compared with single metals, multi-element metals (noble metal-transition metal, transition metal-transition metal, etc.) not only have their own structure, but also have typical metallic properties and the characteristics of their respective metals. In theory, they have very excellent and controllable catalysis performance. Considering that almost all metal catalysts are transition metals (located in the d zone and ds zone of the periodic table of elements), with similar atomic radii, similar outer electronic structure and crystal structure, so it is easy to produce diversified metal combinations. It exhibits a synergetic effect (Synergetic Effect) from each combination component, which often produces an effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N27/26
Inventor 谢祯芳张源胡丹朱丽莲徐甲强
Owner 上海摇橹仪器设备有限公司