A temperature detection device and a method of using the same

Abstract

The present invention relates to the field of temperature detection technology, and in particular to a temperature detection device and a method for using the same. In the present invention, the ambient temperature changes the size of the thermal expansion layer, thereby changing the distance between the first carbon nanotube and the second carbon nanotube, and then changing the chiral field in the chiral luminescent molecular layer, which ultimately causes a serious change in the luminescence intensity of the chiral molecules in the chiral luminescent molecular layer. Therefore, the temperature detection sensitivity and accuracy of the device are high. The present invention changes the luminescence intensity difference of the chiral molecules in the chiral luminescent molecular layer by changing the polarization direction of the linearly polarized light. These differences are only caused by the intensity of the chiral field, eliminating the influence of other factors. Therefore, the accuracy of temperature detection is high.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature detection, and in particular to a temperature detection device and a use method thereof. Background Art

[0002] Temperature detection is a technology that is often needed in real life. With the continuous development of modern science and technology, the application of new materials and new processes, various temperature detectors have appeared one after another, and the method of temperature detection is constantly improving. Similarly, the speed of temperature detection is also constantly improving. Fast and convenient temperature detection methods are also widely used in various fields.

[0003] In the prior art, the general method of detecting temperature is to use a temperature measuring instrument with the help of a temperature sensing element to complete the detection. Common temperature detection instruments in the industry mainly include bimetallic thermometers, thermocouples, thermal resistors and radiation thermometers.

[0004] However, due to the limitation of principle or structure, the accuracy and sensitivity of the above-mentioned temperature detection device are insufficient, which makes it difficult to apply the above-mentioned temperature detection device in high-precision and high-sensitivity temperature detection. Summary of the invention

[0005] To solve the above problems, on the one hand, the present invention provides a temperature detection device, including a substrate, a thermal expansion layer, a carbon nanotube layer, and a chiral luminescent molecule layer; the thermal expansion layer is placed on the substrate, the carbon nanotube layer is placed on the thermal expansion layer, and the chiral luminescent molecule layer is placed on the carbon nanotube layer; the carbon nanotube layer includes periodic units arranged periodically, and the periodic units include first carbon nanotubes and second carbon nanotubes arranged in parallel.

[0006] Furthermore, the first carbon nanotubes and the second carbon nanotubes are doped with nitric acid.

[0007] Furthermore, a distance between the first carbon nanotube and the second carbon nanotube is less than 10 nanometers.

[0008] Furthermore, the period is greater than 1 micron and less than 4 microns.

[0009] Furthermore, it also includes a graphene layer, the graphene layer is disposed on the substrate, and the thermal expansion layer is disposed on the graphene layer.

[0010] Furthermore, the material of the substrate is a thermally conductive material.

[0011] Furthermore, the material of the substrate is a noble metal.

[0012] In another aspect, the present invention provides a method for using a temperature detection device, the method comprising the following steps:

[0013] Step 1, in a test environment, irradiate the carbon nanotube layer with linear polarized light, the angle between the polarization direction of the linear polarized light and the direction of the first carbon nanotube is 45 degrees, and measure the luminous intensity I1 of the chiral luminescent molecular layer;

[0014] Step 2, in the test environment, irradiate the carbon nanotube layer with linear polarized light, the angle between the polarization direction of the linear polarized light and the direction of the first carbon nanotube is 135 degrees, and measure the luminous intensity I2 of the chiral luminescent molecular layer;

[0015] Step 3: Determine the temperature of the environment to be tested by the difference between I1 and I2.

[0016] Beneficial effects of the present invention: The present invention provides a temperature detection device, comprising a substrate, a thermal expansion layer, a carbon nanotube layer, and a chiral luminescent molecule layer; the thermal expansion layer is placed on the substrate, the carbon nanotube layer is placed on the thermal expansion layer, and the chiral luminescent molecule layer is placed on the carbon nanotube layer; the carbon nanotube layer includes a periodic unit arranged periodically, and the periodic unit includes a first carbon nanotube and a second carbon nanotube arranged in parallel. In the present invention, the ambient temperature changes the size of the thermal expansion layer, thereby changing the distance between the first carbon nanotube and the second carbon nanotube, and then changing the chiral field in the chiral luminescent molecule layer, and finally causing the luminescent intensity of the chiral molecules in the chiral luminescent molecule layer to change seriously, so the temperature detection sensitivity and accuracy of the device are high. The present invention changes the luminescent intensity difference of the chiral molecules in the chiral luminescent molecule layer by changing the polarization direction of the linearly polarized light, and these differences are only caused by the intensity of the chiral field, eliminating the influence of other factors, so the temperature detection has high accuracy.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a temperature detection device.

[0019] Figure 2 It is a schematic diagram of another temperature detection device.

[0020] In the figure: 1, substrate; 2, thermal expansion layer; 3, carbon nanotube layer; 31, first carbon nanotube; 32, second carbon nanotube; 4, chiral luminescent molecule layer; 5, graphene layer. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples.

[0022] Example 1

[0023] The present invention provides a temperature detection device. Figure 1As shown, the temperature detection device includes a substrate 1, a thermal expansion layer 2, a carbon nanotube layer 3, and a chiral luminescent molecule layer 4. The thermal expansion layer 2 is disposed on the substrate 1, the carbon nanotube layer 3 is disposed on the thermal expansion layer 2, and the chiral luminescent molecule layer 4 is disposed on the carbon nanotube layer 3. The carbon nanotube layer 3 includes a periodic unit arranged periodically, and the periodic unit includes a first carbon nanotube 31 and a second carbon nanotube 32 arranged in parallel.

[0024] The substrate 1 is used to support the thermal expansion layer 2. The material of the substrate 1 can be silicon or silicon dioxide. Preferably, the material of the substrate 1 is a thermally conductive material, that is, the substrate 1 is a good conductor of heat, and preferably the substrate 1 is a precious metal. In this way, the substrate 1 is more likely to absorb heat from the environment, thereby changing the size of the thermal expansion layer 2 more, causing the thermal expansion layer 2 to expand more. This also makes it easier to fix the substrate 1 on the object to be tested, so that the heat in the object to be tested is more easily transferred to the thermal expansion layer 2, and the thermal expansion layer 2 expands more, which changes the chiral field at the chiral luminescent molecular layer 4 more.

[0025] The thermal expansion layer 2 is made of a material with a high thermal sensitivity coefficient. Preferably, the thermal expansion layer 2 is made of a material with low light absorption. The material of the thermal expansion layer 2 can be PMMA, or ZnSe, etc.

[0026] In the carbon nanotube layer 3, nitric acid is doped on the first carbon nanotube 31 and the second carbon nanotube 32. Specifically, the method of evaporating nitric acid can be applied to dope nitric acid on the first carbon nanotube 31 and the second carbon nanotube 32. After the carbon nanotube layer 3 is set on the thermal expansion layer 2, the nitric acid can be evaporated, and the preparation method is simple. The natural one-dimensional properties of carbon nanotubes and the unique ballistic transport mode of electrons make the carbon nanotube plasmon have excellent characteristics of strong spatial confinement and low loss. The surface plasmon resonance wavelength of carbon nanotubes appears in the infrared band, and the infrared penetration ability is strong, which is convenient for building a complete detection system. In addition, the surface plasmon characteristics of carbon nanotubes can be regulated by chemical doping. Experiments show that hole injection can be achieved by doping nitric acid, which can not only form stronger surface plasmon vibrations near carbon nanotubes, but also realize the regulation of their surface plasmon optical properties. In the carbon nanotube layer 3, the period is greater than 1 micron and less than 4 microns. The first carbon nanotube 31 and the second carbon nanotube 32 are not in contact, and the distance between the first carbon nanotube 31 and the second carbon nanotube 32 is less than 10 nanometers, so that strong coupling is generated between the first carbon nanotube 31 and the second carbon nanotube 32, and a strong chiral field is generated therebetween. The first carbon nanotube 31 and the second carbon nanotube 32 are not in contact because when the thermal expansion layer 2 expands, the chiral field will not suddenly change, causing a sudden change in the luminous intensity of the chiral luminescent molecules.

[0027] The chiral luminescent molecule layer 4 is composed of chiral luminescent molecules. After the carbon nanotube layer 3 is provided, the chiral luminescent molecules can be spin-coated, and the preparation method is simple. The chiral luminescent molecules can be chiral luminescent small molecules or chiral luminescent supramolecular molecules, which are not limited here.

[0028] Example 2

[0029] Based on Example 1, the present invention further provides a method for using a temperature detection device, the method comprising the following steps:

[0030] Step 1, in a test environment, irradiate the carbon nanotube layer 3 with linear polarized light, the angle between the polarization direction of the linear polarized light and the direction of the first carbon nanotube 31 is 45 degrees, and measure the luminescence intensity I1 of the chiral luminescent molecule layer 4;

[0031] Step 2, in the test environment, irradiate the carbon nanotube layer 3 with linear polarized light, the angle between the polarization direction of the linear polarized light and the direction of the first carbon nanotube 31 is 135 degrees, and measure the luminescence intensity I2 of the chiral luminescent molecule layer 4;

[0032] Step 3: Determine the temperature of the environment to be tested by the difference between I1 and I2.

[0033] When the angle between the polarization direction of the linear polarized light used for excitation and the direction of the first carbon nanotube 31 is 45 degrees or 135 degrees, the excitation light excites the first carbon nanotube 31 and the second carbon nanotube 32 to produce a surface plasmon effect, and simultaneously excites three modes on the surface of the first carbon nanotube 31 and the second carbon nanotube 32, that is, m=-1, 0, +1, resulting in the generation of vortex plasmons near the first carbon nanotube 31 and the second carbon nanotube 32, that is, the generation of chiral surface plasmons. At the same time, the excitation light will also excite the chiral luminescent molecules to emit light. The chiral surface plasmons and the chiral luminescent molecules are coupled to each other, so that the luminescence intensity of the luminescent molecules increases or decreases.

[0034] When the angle between the polarization direction of the excitation light and the first carbon nanotube 31 is 45 degrees, the left-handed surface plasmon is excited; when the angle between the polarization direction of the excitation light and the first carbon nanotube 31 is 135 degrees, the right-handed surface plasmon is excited. If the chirality of the chiral luminescent molecule is the same as the chirality of the chiral field around the first carbon nanotube 31 and the second carbon nanotube 32, the luminescence of the chiral luminescent molecule will be enhanced; otherwise, it will be weakened.

[0035] When the temperature of the environment changes, the size of the thermal expansion layer 2 changes, resulting in a change in the distance between the first carbon nanotube 31 and the second carbon nanotube 32, thereby causing the chiral field around the first carbon nanotube 31 and the second carbon nanotube 32 to change. Then the coupling effect with the chiral molecules will also change, so the luminescence intensity of the chiral molecules will also change, resulting in the changes in the above-mentioned I1 and I2. By measuring the difference between I1 and I2, the temperature of the environment to be measured is determined.

[0036] In the present invention, the ambient temperature changes the size of the thermal expansion layer 2, thereby changing the distance between the first carbon nanotube 31 and the second carbon nanotube 32, and then changing the chiral field in the chiral luminescent molecular layer 4, which ultimately causes a serious change in the luminescence intensity of the chiral molecules in the chiral luminescent molecular layer 4. Therefore, the temperature detection sensitivity and accuracy of the device are high. The present invention changes the luminescence intensity difference of the chiral molecules in the chiral luminescent molecular layer 4 by changing the polarization direction of the linearly polarized light. These differences are only caused by the intensity of the chiral field, eliminating the influence of other factors, and therefore, the temperature detection has high accuracy.

[0037] In the present invention, the intensity of the luminescence can not only be judged visually by naked eyes, but also can be accurately judged by detecting the luminescence spectrum, which is convenient to use. In addition, the device can be reused, which reduces the cost.

[0038] Example 3

[0039] On the basis of Example 1, a graphene layer 5 is further included, and the graphene layer 5 is disposed on the substrate 1, and the thermal expansion layer 2 is disposed on the graphene layer 5. On the one hand, the graphene layer 5 helps the heat to spread to the thermal expansion layer 2 faster, so that the temperature measurement is more sensitive and more timely; on the other hand, the graphene layer 5 has a good reflection effect on infrared light, so that a strong coupling is generated between the graphene layer 5 and the carbon nanotube layer 3, and the chiral field between the graphene layer 5 and the carbon nanotube layer 3 is enhanced, and the effect of the chiral field and the chiral luminescent molecules is enhanced, so that the sensitivity of the device is higher.

[0040] Furthermore, the surface of the thermal expansion layer 2 is provided with a strip-shaped pit, and the first carbon nanotube 31 and the second carbon nanotube 32 are arranged in the pit. The cross section of the pit is rectangular. That is to say, the area where the first carbon nanotube 31 and the second carbon nanotube 32 are located is lower, and the junction of adjacent periods is higher. In this way, on the one hand, a stronger chiral field is gathered at the first carbon nanotube 31 and the second carbon nanotube 32; on the other hand, because the chiral luminescent molecules are prepared on the surface of the carbon nanotube layer 3 by the method of spinning glue, there are more chiral luminescent molecules at the first carbon nanotube 31 and the second carbon nanotube 32. These two effects lead to a greater difference in the luminescence intensity of the chiral luminescent molecules under different chiral fields, thereby achieving higher sensitivity temperature detection.

[0041] Furthermore, the depth of the pit is greater than the diameter of the first carbon nanotube 31 and the second carbon nanotube 32. In this way, on the one hand, the chiral field near the first carbon nanotube 31 and the second carbon nanotube 32 is stronger; on the other hand, the thermal expansion layer 2 at the pit is thinner, which is more conducive to the large-scale elongation at the pit. Both effects are conducive to achieving higher sensitivity temperature detection.

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A temperature detection device, characterized in that: It includes a substrate, a thermal expansion layer, a carbon nanotube layer, and a chiral luminescent molecule layer; the thermal expansion layer is placed on the substrate, the carbon nanotube layer is placed on the thermal expansion layer, and the chiral luminescent molecule layer is placed on the carbon nanotube layer; the carbon nanotube layer includes periodic units arranged periodically, and the periodic units include first carbon nanotubes and second carbon nanotubes arranged in parallel; the first carbon nanotubes and the second carbon nanotubes are not in contact, and the distance between the first carbon nanotubes and the second carbon nanotubes is less than 10 nanometers.

2. The temperature detection device according to claim 1, characterized in that: The first carbon nanotubes and the second carbon nanotubes are doped with nitric acid.

3. The temperature detection device according to claim 1, characterized in that: The period is greater than 1 micron and less than 4 microns.

4. The temperature detection device according to claim 1, characterized in that: The invention also includes a graphene layer, wherein the graphene layer is disposed on the substrate, and the thermal expansion layer is disposed on the graphene layer.

5. The temperature detection device according to claim 1, characterized in that: The material of the substrate is a thermal conductive material.

6. The temperature detection device according to claim 5, characterized in that: The material of the substrate is noble metal.

7. The method for using the temperature detection device according to any one of claims 1 to 6, characterized in that: The method of use comprises the following steps: Step 1, in a test environment, irradiate the carbon nanotube layer with linear polarized light, the angle between the polarization direction of the linear polarized light and the direction of the first carbon nanotube is 45 degrees, and measure the luminescence intensity I1 of the chiral luminescent molecule layer; Step 2, in a test environment, irradiate the carbon nanotube layer with linearly polarized light, wherein the angle between the polarization direction of the linearly polarized light and the direction of the first carbon nanotube is 135 degrees, and measure the luminescence intensity I2 of the chiral luminescent molecule layer; Step 3: Determine the temperature of the environment to be tested by the difference between I1 and I2.

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