a kind of sno 2 /Modified carbon nanotube composite electrothermal film and preparation method thereof

A nanotube composite and carbon nanotube technology is applied in the field of SnO2/modified carbon nanotube composite electrothermal film and its preparation, which can solve the problem of high surface resistance of semiconductor electrothermal films, inability to prepare high-temperature conductive films, and high cost of carbon-based electrothermal films. problem, to achieve the effect of increasing the carrier concentration, strong chemical stability, and excellent thermal efficiency

Active Publication Date: 2021-07-02
平江岳峰电热科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above-mentioned carbon-based electric heating film has high cost and low operating temperature; the preparation method of the metal-based electric heating film is not suitable for industrial production; the surface resistance of the semiconductor electric heating film is high, and the emissivity is low; Preparation of high-temperature conductive films

Method used

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  • a kind of sno <sub>2</sub> /Modified carbon nanotube composite electrothermal film and preparation method thereof
  • a kind of sno <sub>2</sub> /Modified carbon nanotube composite electrothermal film and preparation method thereof
  • a kind of sno <sub>2</sub> /Modified carbon nanotube composite electrothermal film and preparation method thereof

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Effect test

Embodiment 1

[0028] SnO of the present invention 2 / Modified carbon nanotube composite electrothermal film includes modified carbon nanotubes and SnO with a mass ratio of 0.005:1 2 . Among them, the modified carbon nanotubes are supported TiO 2 Multi-walled carbon nanotubes with a loading ratio of 1:1.

[0029] The preparation method of the electrothermal film comprises the following steps:

[0030] (1) Carbon nanotube impurity removal: take multi-walled carbon nanotubes and roast them in air at 400°C for 1 hour, then put them into 20% dilute nitric acid solution for 30 minutes of ultrasonication, let them stand for 6 hours, then filter and wash them with distilled water until they are neutral, then dry them. Grind and set aside. The present invention can effectively remove amorphous carbon impurities such as amorphous carbon by heating and oxidizing multi-walled carbon nanotubes in air, oxidizing dilute nitric acid and ultrasonically standing can remove remaining amorphous carbon, cat...

Embodiment 2

[0043] Design 5 groups of parallel experiments, basic steps are identical with embodiment 1, difference is the addition of carbon nanotube, it and SnO 2 The mass ratios are 0.006:1, 0.007:1, 0.008:1, 0.009:1 and 0.016:1, respectively.

[0044] The electrothermal film prepared in this embodiment was tested for performance, and the obtained results are shown in Table 2 below.

[0045] Table 2 The performance table of the electrothermal film prepared by embodiment 2

[0046]

[0047] Combining Table 2 and image 3 It can be seen that the electrothermal film prepared by the present invention has the advantages of high thermal efficiency, good chemical stability, etc., the sheet resistance is less than 100Ω / □, the emissivity reaches 0.9, and the electrothermal conversion efficiency is >90%, which can replace the traditional heating resistor and thermal efficiency is not high. Excellent heating element. When the content of carbon nanotubes is too much, due to their small size,...

Embodiment 3

[0076] Design group parallel experiments, the basic steps are the same as in Example 1, except that the concentration of tin element in the electrothermal film precursor solution is 0.4mol / L, 0.6mol / L, 0.8mol / L and 1mol / L respectively.

[0077] The electrothermal film prepared in Example 3 was tested for performance, and the obtained results are described in Table 6 below.

[0078] The performance table of the electrothermal thin film prepared in table 6 embodiment 3

[0079]

[0080] It can be seen from Table 6 that when the concentration of tin element in the electrothermal film precursor solution is 0.4-0.8mol / L, the prepared electrothermal film has the advantages of high thermal efficiency, good chemical stability, etc., and the sheet resistance is less than 100Ω / □, and the emission The rate reaches 0.9, and the electrothermal conversion efficiency is >90%. If the concentration is low, lower than 0.4mol / L, the sample sprayed with the same solution will have less solute ...

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Abstract

The invention discloses a SnO 2 / Modified carbon nanotube composite electrothermal film and preparation method thereof, the composite electrothermal film includes modified carbon nanotubes and SnO with a mass ratio of 0.005 to 0.01:1 2 The preparation method is to add tin salt into a solvent to prepare a mixed solution, add modified carbon nanotubes and stir well to obtain an electrothermal film precursor solution, preheat the substrate and immerse it in the precursor solution to form a film naturally, The coated substrate is annealed at 450-550° C. for 10-20 minutes. The composite electrothermal film of the invention has small resistance, high emissivity, excellent thermal efficiency, and strong chemical stability, and can replace existing heating resistors or heating elements with poor thermal efficiency; meanwhile, the manufacturing method is simple, energy-saving and environment-friendly, and can be industrialized.

Description

technical field [0001] The invention belongs to the field of electrothermal film preparation, in particular to a SnO 2 / Modified carbon nanotube composite electrothermal film and preparation method thereof. Background technique [0002] Carbon nanotubes are another allotrope of carbon discovered after C60, and their radial dimensions are small. The outer diameter of the tube is generally several nanometers to tens of nanometers, and the inner diameter of the tube is even smaller, some of which are only about 1nm; Its length is generally in the order of microns, and the ratio of length to diameter is very large, up to 103-106nm. Therefore, carbon nanotubes are considered as a typical one-dimensional nanomaterial. Carbon nanotubes have been hailed as future materials since they were discovered by humans, and they are one of the frontier fields of international science in recent years. [0003] At present, electric heating film mainly includes the following four types: [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/12H05B3/14
CPCH05B3/12H05B3/145H05B2203/017
Inventor 吴其胜董卫红侯海军杨子润顾斌黎水平诸华军何寿成杨涛
Owner 平江岳峰电热科技有限公司
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