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A flexible and transparent gas sensor based on semiconducting single-walled carbon nanotubes

A technology of single-walled carbon nanotubes and gas sensors, which is applied in the field of flexible and transparent gas sensors, can solve the problems of consuming a large amount of energy, and achieve the effects of high detection sensitivity, fast response speed, and small size

Active Publication Date: 2017-06-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a flexible and transparent gas sensor based on semiconducting single-walled carbon nanotubes and its preparation method. The obtained gas sensor is flexible, transparent and bendable, and realizes a single-walled carbon nanotube film gas sensor for the first time. The characteristics of miniaturization, stability and durability, portability, low power consumption, use at room temperature, and high sensitivity overcome the problem that existing oxide semiconductor sensors consume a lot of energy due to the need for heating, which is conducive to energy saving and emission reduction

Method used

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  • A flexible and transparent gas sensor based on semiconducting single-walled carbon nanotubes
  • A flexible and transparent gas sensor based on semiconducting single-walled carbon nanotubes
  • A flexible and transparent gas sensor based on semiconducting single-walled carbon nanotubes

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of semiconducting single-walled carbon nanotubes: ferrocene containing sulfur powder (the sulfur powder and ferrocene are evenly mixed, the weight ratio is 1:200) pressed into blocks and placed in a chemical vapor deposition reaction furnace (the diameter of the furnace tube is 50mm, the length of the constant temperature zone is 10cm), in a hydrogen atmosphere, the temperature rises to 1100°C at a rate of 22°C / min, and 30ml / min of methane and 2000ml / min of hydrogen are introduced, and the ferrocene block is pushed To the position where the furnace temperature is 80° C., the growth of single-walled carbon nanotubes is carried out. After the growth of carbon nanotubes, turn off the methane and use 400ml / min hydrogen as the protective gas to allow the reaction furnace to cool down to room temperature naturally. Samples were collected and characterized by multi-wavelength Raman. The Raman spectrum is as follows figure 1 (a)- figure 1(c) shown. Multi-waveleng...

Embodiment 2

[0037] Preparation of semiconducting single-walled carbon nanotubes: same as in Example 1.

[0038] Dry transfer preparation of semiconductive single-walled carbon nanotube film: same as in Example 1, this control deposition time is 4min, and the light transmittance of the obtained semiconductive single-walled carbon nanotube film is 90%, such as image 3 as shown in c.

[0039] Construction and performance of a flexible, transparent, and bendable gas sensor: the manufacturing steps are the same as in Example 1. The sensitivity of the gas sensor to ammonia is 25%, and the response time is 1s.

Embodiment 3

[0041] Preparation of semiconducting single-walled carbon nanotubes: same as in Example 1.

[0042] Wet preparation of semiconductor single-walled carbon nanotube films: the collected carbon nanotube samples are oxidized in air to remove impurities such as amorphous carbon, treated with hydrochloric acid to remove metal catalyst impurities, and rinsed with deionized water to medium sex. Dissolve the cleaned carbon nanotubes in an aqueous solution of 1wt% sodium dodecylbenzenesulfonate (SDBS) or sodium dodecyl sulfate (SDS), and perform TIP ultrasonication for 30 minutes in the mode of ultrasonic 1s, off 1s , then with 13000r / min centrifugal 30~60min, get the supernatant and spray on the PET film, obtain the semiconductive single-walled carbon nanotube-PET composite film that light transmittance is 55% (film thickness) such as image 3 as shown in b.

[0043] Construction and performance of a flexible, transparent, and bendable gas sensor: the manufacturing steps are the same...

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Abstract

The invention relates to the field of flexible and transparent gas sensors, in particular to a flexible and transparent gas sensor based on semiconducting single-wall carbon nanotubes and a preparation method thereof, and uses semiconducting single-wall carbon nanotube flexible transparent films to construct a high-performance flexible gas sensor . Using semiconducting single-walled carbon nanotubes as gas-sensing materials, using floating catalyst chemical vapor deposition to prepare and collect semiconducting single-walled carbon nanotube films, and prepare semiconducting single-walled carbon nanotubes loaded on flexible transparent substrates by hot-press transfer or spraying process The flexible and transparent film of single-walled carbon nanotubes is connected to the external output device by using silver glue or electroplating connecting wires to complete the assembly of flexible and transparent gas sensor elements of semiconducting single-walled carbon nanotubes. The invention realizes the preparation of small, light, flexible, transparent, bendable, and high-performance gas sensors, and breaks through the limitations of current metal oxide gas sensors in terms of flexibility, transparency, bendability, and weight.

Description

technical field [0001] The invention relates to the field of flexible and transparent gas sensors, in particular to a flexible and transparent gas sensor based on semiconducting single-wall carbon nanotubes and a preparation method thereof, and uses semiconducting single-wall carbon nanotube flexible transparent films to construct a high-performance flexible gas sensor . Background technique [0002] With the continuous development of intelligence and informatization, in many fields of modern society (including environmental monitoring, industrial production, medical diagnosis, national defense and military, etc.), the real-time monitoring of environmental gases has become more and more important, and the development of lightweight , Portable real-time gas analysis sensors will bring many conveniences to human production and life. Currently, metal oxide semiconductor (MOS) sensors and solid electrolyte (SE) sensors occupy most of the gas sensor market. However, both need t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 石超郭舒予侯鹏翔刘畅成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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