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CNT (carbon nano tube) electroluminescent gas sensor and application thereof

A technology of gas sensor and carbon nanotubes, which is applied in the field of sensors to achieve the effect of prolonging life

Inactive Publication Date: 2013-04-24
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of electroluminescent properties of substances to analytical chemistry has not been reported

Method used

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  • CNT (carbon nano tube) electroluminescent gas sensor and application thereof
  • CNT (carbon nano tube) electroluminescent gas sensor and application thereof
  • CNT (carbon nano tube) electroluminescent gas sensor and application thereof

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Experimental program
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Embodiment Construction

[0031] Experimental steps:

[0032] 1) Acid treatment of carbon nanotubes: Weigh 2.0g of original single-wall or multi-wall carbon nanotubes, add them to a mixed solution of 150ml concentrated sulfuric acid and 50ml concentrated nitric acid, stir to disperse the carbon nanotubes evenly, and then put them into ultrasonic cleaning The instrument was sonicated for 6 hours, and washed repeatedly with ultrapure water until the pH of the filtrate was neutral. The carbon nanotubes were centrifuged and dried for later use.

[0033] 2) Use absolute ethanol to mix the carbon nanotube material into a suspension liquid, put it into the ultrasonic wave for about 1-1.5 hours, and use a glass rod to evenly coat the conductive side of the ITO conductive glass. After the absolute ethanol is volatilized, use an insulating The conductive glass coated with carbon nanotube material and the flat aluminum sheet are bonded together by resin or gas non-conductive substance, and a certain gap (50 μm t...

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Abstract

The invention discloses a CNT electroluminescent gas sensor and the application in gas testing, wherein the sensor includes a CNT coasted on one surface of a conducting glass which is bonded with a flat aluminum sheet through an insulator, the CNT is coasted on one surface of the conducing glass and is positioned between the conducting glass and the aluminum sheet, the space between the conducting glass and the aluminum sheet is 50Mu Mu-150Mu Mu, moreover, a channel for gas passing is arranged between the conducting glass and the aluminum sheet. The aluminum sheet and the conducting glass are placed in an air breather and sealed well, and are respectively connected with the positive pole and the negative pole of a power supply. The sensor is placed in a cassette and a photomultiplier collects optical signals. The CNT electroluminescent gas sensor is capable of achieving room temperature detection; moreover, the process of detecting CNT electroluminescence is low in power consumption (low in voltage). By using low voltage to prebreakdown ionized gas, the strong discharging of breakdowning ionized type cannot happen, no damage to electrode of CNT generates, and the life of sensor is prolonged.

Description

technical field [0001] The invention belongs to the field of sensors, in particular to a carbon nanotube electroluminescent gas sensor and its application. Background technique [0002] In environmental protection, medical treatment and industrial production, NO 2 , O 2 , NH 3 , N 2 , CO 2 、H 2 、CH 4 , CO and H 2 Real-time detection of gas molecules such as O is of great significance. Currently, metal oxide semiconductor (MOS) sensors and solid electrolyte (SE) sensors occupy most of the gas sensor market. However, they either need to work at a higher temperature, or consume a lot of power, have low sensitivity, and have poor anti-interference ability, which is inconvenient to use. Other gas sensors mainly include catalytic combustion gas sensors, electrochemical gas sensors, fiber optic gas sensors, etc. Catalytic combustion gas sensors are less affected by temperature and humidity and respond quickly, but this sensor is aimed at detecting the lower explosive limi...

Claims

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Application Information

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IPC IPC(8): G01N21/66
Inventor 申丽华于春侠李华静闫蓓魏海霞刘勇缪琳高广前吴波
Owner XIAN UNIV OF SCI & TECH