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A method for improving the temperature-sensitive properties of graphene oxide with n and mo

A graphene and characteristic technology, which is applied to thermometers, thermometers, and electrical devices that use electrical/magnetic components that are directly sensitive to heat. It can solve the problems of small feedback signal current, increase measurement accuracy, and effectively measure large temperatures. range, the effect of increasing the feedback current

Active Publication Date: 2018-03-20
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the applicable range of the temperature sensor invented by Chinese patent CN103318874B is only in the range of 25-250°C, and its resistivity increases rapidly to exceed 10°C near room temperature. 7 Ωcm, such a huge resistivity causes the feedback signal current to be too small

Method used

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  • A method for improving the temperature-sensitive properties of graphene oxide with n and mo
  • A method for improving the temperature-sensitive properties of graphene oxide with n and mo
  • A method for improving the temperature-sensitive properties of graphene oxide with n and mo

Examples

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Embodiment 1

[0025] Step 1: Prepare doped graphene oxide powder, the steps are as follows: add 50g / L graphite powder and 20g / L potassium permanganate to obtain a mixed solution in the concentrated sulfuric acid with a mass fraction of 98%, and the above mixed solution is successively added at 10 / L After stirring for 1 hour at 30 / 90 degrees Celsius, add 30% hydrogen peroxide with a mass fraction equal to the volume of the mixed solution, take out the precipitate after standing for 5 days, ultrasonicate for 2 hours, centrifugal filter and dry to obtain graphene oxide powder.

[0026] Step 2: Utilize NO 2 The gas N-doped graphene oxide, the steps are as follows: put the graphene oxide powder into the tube furnace, under the pressure of 50Pa NO 2 Heated to 800°C in the atmosphere, then kept the temperature for 5 minutes, cooled to room temperature, and took it out.

[0027] Step 3: Using MoCl 3 Doping graphene oxide with Mo, the steps are as follows: MoCl 3 Dissolve in THF and prepare a sol...

Embodiment 2

[0031] The preparation method and test are the same as in Example 1, but the doping steps in Step 2 and Step 3 are omitted. figure 2 The resistivity measured at different temperatures of the graphene oxide block prepared in this implementation is provided in the present embodiment, it can be seen that the resistivity changes with the temperature, but the degree of nonlinearity is larger than that of Example 1, In the low temperature area, the resistivity rises very fast, and it is close to 10 at 0°C. 8 Ωcm order of magnitude, while the resistivity change is not obvious in the high temperature zone, and the overall temperature sensitivity is worse than that of Example 1. Comparing Example 1 and Example 2, it can be seen that co-doping significantly improves the temperature-sensitive properties of graphene oxide.

Embodiment 3

[0033] The preparation method and test are the same as in Example 1, but the doping link in Step 2 is omitted. image 3 The resistivity measured at different temperatures of the graphene oxide block prepared in this implementation is given in the figure. It can be seen that the resistivity changes with the temperature, but the degree of nonlinearity is greater than that of Example 1.

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Abstract

The invention discloses the application of N and Mo for improving the temperature-sensitive properties of graphene oxide. The graphene oxide is doped with NO2 and MoCl3 as doping sources. The energy band structure of the doped graphene changes, and the functional group The restraint ability of graphene oxide has changed, and the resistance-temperature characteristic of graphene oxide material has been improved; adopt the method of the present invention, can significantly reduce the resistivity of graphene oxide to the non-linear degree of temperature change, thereby can allow corresponding graphene oxide Graphene temperature sensor obtains a larger effective temperature measurement range; adopting the method of the present invention can significantly reduce the resistivity of graphene oxide at room temperature and low temperature region, thereby improving the feedback current at room temperature and low temperature region, and increasing the measurement accuracy; The invented method is a post-processing process after the graphene oxide is prepared, and does not conflict with the specific preparation process of graphene oxide. It is a characteristic enhancement scheme for graphene oxide finished products, so the method has wide adaptability.

Description

technical field [0001] The invention relates to the field of electronic materials and their preparation, and relates to a method for improving the temperature-sensitive properties of graphene oxide materials by co-doping, in particular to a method for improving the temperature-sensitive properties of graphene oxide with N and Mo. Background technique [0002] Graphene is a material composed of one or several layers of C atoms, and its C-C bonds are combined by sp2 to form a dense honeycomb lattice structure. Due to its unique two-dimensional carbon nanostructure and excellent physical properties, it has attracted widespread interest in the fields of physics, materials science, and condensed matter physics. [0003] Graphene is a very good conductive material, while graphene oxide is a material with high resistivity, but at the same time, due to the adsorption and desorption properties of graphene oxide functional groups, its resistivity has certain temperature-sensitive char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/22
Inventor 倪磊杨甜甜任新苗段理樊继斌于晓晨田野程晓姣何凤妮
Owner CHANGAN UNIV
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