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Palladium-doped stannic oxide wrapped carbon nano tube as well as preparation method and application of nano tube

A technology of tin dioxide and carbon nanotubes, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of low gas sensitivity performance and long response-recovery time, achieve high sensitivity and improve gas sensitivity Performance, easy-to-achieve effects

Inactive Publication Date: 2014-04-09
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] SnO 2 It is a common semiconductor gas-sensing material, which responds to many gases, but its gas-sensing performance is low, and it usually needs to be above 350°C to reach the optimum operating temperature, and the response-recovery time is long

Method used

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  • Palladium-doped stannic oxide wrapped carbon nano tube as well as preparation method and application of nano tube
  • Palladium-doped stannic oxide wrapped carbon nano tube as well as preparation method and application of nano tube
  • Palladium-doped stannic oxide wrapped carbon nano tube as well as preparation method and application of nano tube

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Ultrasonically disperse carbon nanotubes in ultrapure water for 20 minutes, add tin tetrachloride pentahydrate precursor and ultrasonically disperse, then add sodium chloropalladate solution (the molar ratio of Pd / Sn is 1%) to adjust the pH value to 8, magnetically stirred at 60-90°C for 6h to obtain a milky white sol, washed, dried, calcined at 200°C and kept for 24h to prepare palladium-doped tin dioxide-coated carbon nanotubes (Pd / SnO 2 / CNT).

[0036] Take a certain amount of Pd / SnO 2 / CNT is placed in an agate mortar, added an appropriate amount of deionized water and ground into a uniform and fine slurry, and then coated on the gold finger electrode based on aluminum oxide, and the gas sensor is prepared by coating. The sensing layer is about 100um, dried in the shade after coating, and then placed in a gas sensor tester, assembled into a complete circuit to form a complete gas sensing device, and aged for 24 hours. Testing its gas-sensing performance shows that...

Embodiment 2

[0039] Ultrasonically disperse carbon nanotubes in ultrapure water for 20 minutes, add tin tetrachloride pentahydrate precursor and ultrasonically disperse, then add sodium chloropalladate solution (the molar ratio of Pd / Sn is 3%) to adjust the pH value to 8, magnetically stirred at 60-90°C for 6h to obtain a milky white sol, washed, dried, calcined at 200°C and kept for 24h to prepare palladium-doped tin dioxide-coated carbon nanotubes (Pd / SnO 2 / CNT).

[0040] Take a certain amount of Pd / SnO 2 / CNT is placed in an agate mortar, added an appropriate amount of deionized water and ground into a uniform and fine slurry, and then coated on the gold finger electrode based on aluminum oxide, and the gas sensor is prepared by coating. The sensing layer is about 100um, dry it in the shade after painting, then put it in the gas sensor tester, assemble it into a complete circuit, form a complete gas sensing device, age the current for 24 hours, and set it aside.

[0041] performance ...

Embodiment 3

[0043] Ultrasonic dispersion of carbon nanotubes in ultrapure water for 20 min, adding tin tetrachloride pentahydrate precursor and ultrasonic dispersion, then adding sodium chloropalladate solution (Pd accounted for Pd / SnO 2 / CNT mass fraction is 1wt%), adjust the pH value to 7, stir magnetically at 30°C for 36h to obtain a milky white sol, wash, dry, calcinate at 700°C and keep warm for 1h to prepare palladium-doped tin dioxide-coated carbon nano tube (Pd / SnO 2 / CNT).

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Abstract

The invention discloses a palladium-doped stannic oxide wrapped carbon nano tube which is prepared by using a gel-sol method. The carbon nano tube is structurally prepared by wrapping the surface of the carbon nano tube with palladium-doped stannic oxide crystal (Pd / SnO2), and the method comprises the following steps: dispersing the carbon nano tube into super-pure water in an ultrasonic mode, adding a stannic chlori precursor, dispersing in the ultrasonic mode again, subsequently adding a sodium tetrachloropalladate solution, uniformly stirring, mixing, adjusting the pH value to be 7-9, preserving for 0.2-36 hours at 30-200 DEG C so as to obtain milk white gel, washing and drying the gel, subsequently calcining at 200-700 DEG C so as to prepare the palladium-doped stannic oxide wrapped carbon nano tube. Due to adoption of noble metal and doping of the carbon nano tube, the gas-sensitive property of a stannic oxide-based gas sensor is greatly improved, the response and recovery time is shortened, and the low operation temperature is optimal.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and relates to a palladium-doped tin dioxide-coated carbon nanotube (Pd / SnO2) prepared by a sol-gel method. 2 / CNT). Background technique [0002] Metal oxide semiconductor gas sensors are widely used in the detection of explosive, toxic, and environmental hazards. At present, the most common metal oxide sensitive materials are ZnO, SnO 2 , Fe 2 o 3 、TiO 2 etc., where SnO 2 It is the most widely used gas sensor. There are many preparation methods for tin dioxide-based powder and film materials, such as powder sintering method, chemical vapor deposition method, spray pyrolysis method, sol-gel method, radio frequency magnetron sputtering method, pulsed laser deposition method, compared with other There are many advantages in the preparation of tin dioxide-based materials by the sol-gel method, so it is widely used. Its main advantages are: low production cost, simple equipment, materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 刘善堂胡清华刘欢欢
Owner WUHAN INSTITUTE OF TECHNOLOGY
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