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Preparation method of thermosensitive film for NTC powder and graphene compound plane

A graphene composite, graphene film technology, applied in the direction of flat products, non-adjustable metal resistors, electrical components, etc., can solve the limitation of the resistance range and convenience of thermistor and infrared detection applications, the resistance value is too large, The problem of large resistance value, etc., can improve the photoelectric conversion efficiency, reduce the internal resistance, and achieve the effect of good electrical conductivity.

Active Publication Date: 2018-09-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem is that this kind of material itself has a large resistance value at room temperature, and generates charge carriers after absorbing heat or infrared. The current is mainly consumed in heating itself, and it is difficult to conduct it as a current.
Although some researchers use it in solar cells, its internal resistance is too large and the actual efficiency of photoelectric conversion is low, which limits its application as solar cells.
Similarly, due to the large resistance value, its application resistance range and convenience as a thermistor and infrared detection are limited.

Method used

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  • Preparation method of thermosensitive film for NTC powder and graphene compound plane
  • Preparation method of thermosensitive film for NTC powder and graphene compound plane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: at first, make composite monolithic film, single-layer graphene powder is pressed into 0.1mm thickness film, brushes NTC semiconductor thermosensitive material 100 nanometers of Mn on it 3 co 2 NiO 18-x (x>0.01) powder film formation, the two are just pressed into a piece of monolithic composite film; According to coating 100 nanometer Mn 3 co 2 NiO 18-x (x>0.01) Different powder quality can prepare multiple different Mn 3 co 2 NiO 18-x monolithic composite film.

[0054] Secondly, make a laminated composite film, multiple different Mn 3 co 2 NiO 18-x content of monolithic composite films, according to Mn 3 co 2 NiO 18-x The content is high or low, stacked together in turn, and stacked together by pressure machinery or other tableting means to form a laminated composite film. The specific local microstructure of the laminated composite film is shown in the attached figure 1 shown.

Embodiment 2

[0055] Embodiment 2: at first, make composite monolithic thin film, NTC semiconductor thermosensitive material adopts average particle diameter 100 nanometers Mn 3 co 2 NiO 18-x (x>0.01) powder, single-layer graphene powder and heat-sensitive NTC semiconductor powder material according to the mass ratio 1:1, 1:3, 1:4, 1:5, 1:7: 1:9, Put the six kinds of mixed powder into the grinding equipment to grind and mix separately, and use the electron microscope to detect that after more than 90% of the NTC semiconductor powder is coated with graphene, it can be considered to be evenly mixed, and then the six different Mn 3 co 2 NiO 18-x content of mixed powders were compressed into tablets to make six kinds of single-chip composite films.

[0056] Secondly, make laminated composite films, six different Mn 3 co 2 NiO 18-x content of monolithic composite film, according to the Mn in the film 3 co 2 NiO 18-x The content is high or low, stacked together in turn, and stacked toge...

Embodiment 3

[0057] Embodiment 3: First, make a composite monolithic film. Stir and mix the single-layer graphene powder with water to form a suspension. Place a glass sheet in a container such as a beaker, let the single-layer graphene powder in the suspension settle on the glass surface, and wait for the graphene in the suspension to completely After the film is precipitated, the water above is clarified, and the water is poured out, and the graphene film on the glass is dried to remove residual moisture; then the glass sheet with graphene attached is placed in the container, and the Mn with an average particle size of NTC semiconductor is 50nm 3 CoNiCuO 18-x The powder is stirred and mixed with water to make a suspension, and it is also added to a container such as a beaker, so that the Mn in the suspension 3 CoNiCuO 18-x The powder is deposited on the glass surface, and the Mn in the suspension is allowed to stand 3 CoNiCuO 18-xAfter the powder is all precipitated into a film, the ...

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Abstract

The invention relates to a preparation method of a thermosensitive film for an NTC powder and graphene compound plane. An NTC powder material and graphene for forming the general formula are compounded to prepare a film shape, the NTC powder material is coated or superimposed with graphene to form a sheet film, and the total resistance value of the compounded film is reduced. In order to better absorb solar radiation energy, graphene and the NTC powder material with various ratios can be compounded to respectively prepare films, then the films are superimposed to form a film with a microscopicgradient structure, and the internal resistance value is anisotropic according to different electrode connecting directions and positions, so that a better heat absorbing effect is realized, the self-resistance is reduced, the electrical conductivity is good, and the resistance value also can be set artificially. A single film or a superimposed film and a polymer film or a polymer fiber porous film are pressed again to be compounded into a new compound film, so that the toughness and the strength are improved.

Description

technical field [0001] The invention belongs to a method for preparing solar light absorbing materials, and relates to a method for preparing a composite planar thermosensitive film of NTC powder and graphene. In a combined way, a flat multi-layer gradient film laminated structure is made. Through different electrode connection methods, different performance thermistors and infrared photoelectric absorption and detection devices can be obtained, which are used for infrared detection absorption, solar cells, and light detection. Switches, laser signal detection and high-performance thermistors and other fields. Background technique [0002] Negative temperature coefficient semiconductor (abbreviated NTC) powder material is a transition metal series oxide solid solution, and the general composition formula can generally be written as Mn a co b Fe c Cu d Ni e x f o h-x (in the composition a>0.1, b+c+d+e+f>0.01, b, c, d, e, any one or more of them can be equal to ze...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01H01C7/04
CPCB29D7/01H01C7/041
Inventor 苏力宏黄维邹子翱周云鹏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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