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Nanocrystalline metal oxide functionalized carbon nanotube material and formaldehyde gas sensor

A technology of carbon nanotubes and nanometals, which is applied in the field of electronic device manufacturing, can solve problems such as time-consuming, expensive instruments, and increased manufacturing costs of sensors, achieving low-cost and good-response effects

Inactive Publication Date: 2014-03-26
SUZHOU NANOGRID TECH
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Problems solved by technology

[0004] Most of the traditional formaldehyde detection methods are time-consuming, expensive instruments, and cannot be detected online in real time. In recent years, with the development of sensor technology, formaldehyde gas sensors made of nickel oxide materials have been widely used. However, in order to improve For the detection sensitivity of formaldehyde gas, some noble metals (such as gold) need to be added as active materials, which leads to the increase of sensor manufacturing cost, which is not conducive to large-scale industrial implementation

Method used

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  • Nanocrystalline metal oxide functionalized carbon nanotube material and formaldehyde gas sensor

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Embodiment 1

[0061] The mass ratio of carbon nanotubes to nickel oxide is 1:0.5; the specific preparation process: the metal paste is printed on the substrate with conductive electrodes and heating electrodes by screen printing, and after high temperature sintering, inkjet printing is used to print conductive electrodes on the substrate. Print a layer of carbon nanotubes in the electrode area, and then print a layer of Ni(OH) on the carbon nanotubes by inkjet printing or chemical water bath deposition 2 , and finally the formaldehyde gas sensor was obtained after annealing.

[0062] The test curve for the detection of formaldehyde gas is as follows: Figure 17 As shown, it can be seen from the figure that the initial resistance is 9025 ohms. When the input amount of formaldehyde gas is 10.5ppm, the response of the sensor at this time is relatively large; when the input formaldehyde is 5.25ppm, the response of the sensor drops by nearly half ; When the input formaldehyde was 3.15ppm, the r...

Embodiment 2

[0064] The mass ratio of carbon nanotubes to nickel oxide is 1:1; the specific preparation process: the pattern on the mask plate is transferred to the substrate by photolithography, a layer of metal bonding layer is deposited, and then deposited on the metal bonding layer A layer of metal or alloy film is used to obtain heating electrodes and conductive electrodes, and then nanometer metal oxide functionalized carbon nanotubes are deposited on the conductive electrode area, and formaldehyde gas sensors are obtained after high-temperature annealing.

[0065] The test curve for the detection of formaldehyde gas is as follows: Figure 18 As shown, the formaldehyde test concentration of this formaldehyde gas sensor can reach 1.05ppm, which is a little lower than that measured in Example 1. From the perspective of indoor health conditions, the response of the formaldehyde sensor to formaldehyde cannot meet the standard at this time.

Embodiment 3

[0067] The mass ratio of carbon nanotubes to nickel oxide is 1:14; the specific preparation process: prepare heating electrodes on the substrate by physical vapor deposition or printing methods, configure the precursor ink of the insulating layer, and print a Layer precursor ink, annealed at a certain temperature in the air atmosphere to obtain an insulating dielectric layer; on the insulating dielectric layer, use physical vapor deposition or printing methods to prepare conductive electrodes; deposit nanometer metal oxide functionalized carbon nanotubes on the conductive electrodes to obtain formaldehyde Gas sensor, and then use this sensor to detect formaldehyde gas, the test curve is as follows Figure 19 shown. It can be seen from the figure that 10ppb formaldehyde gas can be detected under this condition. As the concentration of formaldehyde gas increases, the response of the gas becomes higher and higher, and the response time and recovery time are both fast, and the co...

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Abstract

The invention discloses a nanocrystalline metal oxide functionalized carbon nanotube material and a formaldehyde gas sensor prepared by using the material. The material comprises carbon nanotube and nickel oxide, and the mass ratio of the carbon nanotube to the nickel oxide is (1:0.1)-(1:30). The nanocrystalline metal oxide functionalized carbon nanotube material provided by the invention, can have a well response to the formaldehyde gas when used as gas sensitive material applied to the formaldehyde gas sensor through special proportion between the carbon nanotube and the nickel oxide, is relative low in cost, and can facilitate the industrialized implementation of the formaldehyde gas sensor.

Description

technical field [0001] The invention belongs to the technical field of electronic device manufacturing, and in particular relates to a nanometer metal oxide functionalized carbon nanotube material and a formaldehyde gas sensor using the material. Background technique [0002] With the improvement of people's living standards and the change of people's requirements for furniture environment decoration, the problem of indoor air quality has become increasingly prominent. The main indoor polluting gases after home decoration are formaldehyde and benzene series. It is reported from time to time. Formaldehyde is highly irritating to the eyes and respiratory tract of the human body. Delayed pulmonary edema, adult respiratory distress syndrome, chest tightness, respiratory distress, cough and other symptoms often occur after an incubation period of several hours to ten hours or longer. Therefore, the detection of formaldehyde in indoor air is of great significance to the protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/18C01B31/02C01G53/04B82Y30/00C01B32/158
Inventor 徐红艳张克栋崔铮
Owner SUZHOU NANOGRID TECH
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