CN111335019B

CN111335019B - Intermediate infrared emission method based on graphene fibers

Info

Publication number: CN111335019B
Application number: CN202010149927.7A
Authority: CN
Inventors: 高超; 方波; 徐杨
Original assignee: Hangzhou Gaoxi Technology Co Ltd
Current assignee: Hangzhou Gaoxi Technology Co Ltd
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2022-09-09
Anticipated expiration: 2040-03-06
Also published as: CN111335019A

Abstract

The invention discloses a graphene fiber-based mid-infrared emission method, which comprises the steps of firstly preparing high-flexibility graphene fibers by using a wet spinning technology, and then enabling the graphene fibers to emit mid-infrared light under the driving of an electric field by using an ash body radiation principle; the distribution area of the light-emitting wavelength is 1-30 microns, and the light-emitting frequency reaches 10 MHz as fast as possible; the method takes the graphene fiber as an emission light source, and has the advantages of good flexibility, low price, low density and low energy consumption.

Description

Intermediate infrared emission method based on graphene fibers

Technical Field

The invention relates to a mid-infrared emission method, in particular to a mid-infrared emission method based on graphene fibers.

Background

The longer wavelength distribution of the mid-infrared light determines that the mid-infrared light can be absorbed by chemical molecules, and the mid-infrared light is in the radiation range of organisms, so that the mid-infrared light plays an important role in the fields of molecular detection, medical care, meteorological science, security inspection, secret communication and the like.

The emitting source of mid-infrared light reported before is mostly constructed by semiconductor devices, and the principle is that carriers are recombined under the action of an electric field to generate mid-infrared photons. This device has two major drawbacks: the first is low efficiency, and the second is that most semiconductor devices are transition metal materials with high brittleness, high price and high preparation cost.

Disclosure of Invention

The invention aims to provide a graphene fiber-based mid-infrared emission method, which is characterized in that mid-infrared light is emitted by graphene fibers by inputting voltage to the graphene fibers; the method takes the graphene fiber as an emission light source, has good flexibility, low price, low density, good conductivity and low energy consumption, and is suitable for complex working environments, wherein the working air pressure environment is 0-1013mbar, and the working temperature environment is 30-400K.

In order to achieve the purpose, the invention adopts the following scheme: a mid-infrared emission method based on graphene fibers is characterized in that voltage is input to the graphene fibers, and the voltage range is 0.1-3.6V/cm; the carbon-oxygen ratio of the graphene fiber is more than 10.

Generally, the diameter of the graphene fiber is 0.1-1000 microns, and the length can be arbitrarily selected according to actual conditions.

The graphene fiber is prepared by wet spinning.

The graphene fiber is fixed between two metal electrodes to input an excitation voltage.

In some preferred embodiments, copper, silver, or zinc may be used as the metal electrode.

The graphene fiber can be a solid cylinder, a hollow cylinder, a core-shell structure, a belt shape and a spiral shape.

The graphene fiber converts input electric energy into joule heat through grey body radiation and radiates the joule heat in the form of mid-infrared light, and the wavelength distribution and the light-emitting frequency of the radiation can be regulated and controlled through an electric field; the input electric field is gradually increased, the temperature of the surface of the fiber is gradually increased, the luminous intensity is enhanced, and the wavelength is blue-shifted to short wave.

The distribution area of the light-emitting wavelength of the graphene fiber is 1-30 micrometers, and the light-emitting frequency can reach 10 MHz as fast as possible.

The invention has the beneficial effects that: the preparation process is safe and controllable, the energy consumption is low, and the raw materials are wide in source; the operation process is simple and convenient, and the emission frequency is high; because the graphene fiber has good flexibility, the intermediate infrared emitter has wide application prospect in the fields of flexible electronic devices, wearable intelligent devices and the like.

Drawings

FIG. 1 is a schematic diagram of mid-infrared emission of graphene fibers;

fig. 2 is a schematic structural diagram (a) of a graphene fiber testing device and a schematic light-emitting frequency diagram (B) thereof.

Fig. 3 is a wavelength distribution and a theoretical curve of the graphene fiber under different working voltages, and the input electric field magnitudes corresponding to the curve are 1.1, 2.53 and 3.53V/cm from bottom to top in sequence.

Example 1

(1) The graphene oxide dispersion liquid is used as a raw material, and a wet spinning technology is used for preparing ribbon-shaped graphene fibers with the diameter of 10 microns.

(2) Graphene fibers with the length of 1cm are fixed between zinc electrodes, an electric field is input, the graphene fibers emit mid-infrared light, and a schematic diagram of the mid-infrared emission of the graphene fibers is shown in fig. 1. When the electric field strength was 0.1V/cm, 0.3V/cm, 1V/cm, 2V/cm, 3V/cm, and 3.6V/cm, respectively, the surface temperature, the emission intensity, and the emission wavelength of the graphene fiber were changed, as shown in table 1. The variation of the light emission frequency is shown in fig. 2.

Table 1: surface temperature and light-emitting wavelength of graphene fiber under different electric field intensities

Electric field intensity (V/cm)	Surface temperature (K)	Luminescence wavelength (mum)
			0.1	310	2-18
0.3	318	2-15
			1.0	330	1.8-12
2.0	560	1.7-12
			3.0	630	1.5-12
3.6	720	1.5-10

As can be seen from table 1, as the electric field intensity increases, the surface temperature of the graphene fiber increases, the emission intensity increases, and the emission wavelength shifts to a short-wave blue.

As can be seen from fig. 2, the light emission frequency of the graphene fiber is not affected by the magnitude of the electric field.

Fig. 3 is a wavelength distribution and a theoretical curve of the graphene fiber under different working voltages, and comparison with the theoretical curve of the gray body radiation proves that the working principle of infrared emission in the graphene fiber is gray body radiation, and the efficiency is high.

Example 2

(1) The solid cylindrical graphene fiber with the diameter of 30 microns is prepared by using a wet spinning technology by taking the dispersion liquid of graphene oxide as a raw material.

(2) Graphene fibers with the length of 2.5cm are fixed between copper electrodes, and an electric field with the strength of 1V/cm is input. Through tests, the surface temperature of the graphene fiber is about 330K, the mid-infrared light with the emission wavelength distribution of 1.8-12 microns is emitted, and the light emitting frequency is 10 MHz.

Example 3

(1) The graphene fiber with the core-shell structure and the diameter of 80 microns is prepared by using a wet spinning technology and taking a dispersion liquid of graphene oxide as a raw material.

(2) And fixing the graphene fiber with the length of 5cm between silver electrodes, and inputting an electric field with the strength of 2.5V/cm. Through tests, the surface temperature of the graphene fiber is about 580K, the mid-infrared light with the emission wavelength distribution of 1.6-12 microns is emitted, and the light emitting frequency is 10 MHz.

Example 4

(1) The method is characterized in that a dispersion liquid of graphene oxide is used as a raw material, and a wet spinning technology is used for preparing the hollow cylindrical graphene fiber with the diameter of 100 microns.

(2) Graphene fibers with the length of 8cm are fixed between zinc electrodes, and an electric field with the strength of 3V/cm is input. Through tests, the surface temperature of the graphene fiber is about 630K, the mid-infrared light with the emission wavelength distribution of 1.5-12 microns is emitted, and the light-emitting frequency is 10 MHz.

Example 5

(1) Taking the dispersion liquid of graphene oxide as a raw material, and preparing the spiral graphene fiber with the diameter of 200 microns by using a wet spinning technology.

(2) Graphene fibers with the length of 10cm are fixed between copper electrodes, and an electric field with the size of 3.5V/cm is input. Through tests, the surface temperature of the graphene fiber is about 660K, the emitted wavelength distribution of the medium infrared light is 1.5-12 microns, and the light emitting frequency is 10 MHz.

Claims

1. A mid-infrared emission method based on graphene fibers is characterized in that voltage is input to the graphene fibers, and the voltage range is 0.1-3.6V/cm; the carbon-oxygen ratio of the graphene fiber is more than 10.

2. The method according to claim 1, wherein graphene fibers are fixed between two metal electrodes to input an excitation voltage.

3. The method of claim 1, wherein the graphene fiber may be a solid cylinder, a hollow cylinder, a core-shell structure, a ribbon, or a helix.