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Application of employing N and Mo for improving temperature-sensitive characteristics of oxidized graphene

A graphene and temperature-sensitive 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 have wide adaptability. , the effect of reducing the resistivity

Active Publication Date: 2016-01-13
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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  • Application of employing N and Mo for improving temperature-sensitive characteristics of oxidized graphene
  • Application of employing N and Mo for improving temperature-sensitive characteristics of oxidized graphene
  • Application of employing N and Mo for improving temperature-sensitive characteristics of oxidized graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Step 1: Prepare doped graphene oxide powder. The steps are as follows: add 50g / L graphite powder and 20g / L potassium permanganate to 98% concentrated sulfuric acid to obtain a mixed solution. After stirring at 30 / 90 degrees Celsius for 1 hour each, adding 30% hydrogen peroxide with the same volume as the mixed solution, taking out the precipitate after standing for 5 days, ultrasonic treatment for 2 hours, centrifugal filtration and drying to obtain graphene oxide powder.

[0027] Step 2: Use NO 2 The gas doped graphene oxide with N, and the steps are as follows: Put the graphene oxide powder into a tube furnace, and place the graphene oxide powder at a pressure of 50Pa NO 2 After heating to 800°C in an atmosphere, the temperature is kept for 5 minutes, and then it is taken out after cooling to room temperature.

[0028] Step 3: Use MoCl 3 Doping graphene oxide with Mo, the steps are as follows: add MoCl 3 Dissolve in THF and prepare a solution with a molar concentration of 1...

Embodiment 2

[0032] The preparation method and test are the same as in Example 1, but the doping link in step 2 and step 3 is omitted. figure 2 The resistivity measured at different temperatures for the graphene oxide block prepared in this embodiment is given in the section. It can be seen that the resistivity changes with the temperature, but the degree of nonlinearity is greater than that of Example 1. The resistivity rises extremely fast in the low temperature zone, and it is close to 10 at 0℃ 8 In the order of Ωcm, the resistivity in the high temperature zone does not change significantly, 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 sensitivity of graphene oxide.

Embodiment 3

[0034] 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. It can be seen that the resistivity changes with the temperature, but the degree of non-linearity is greater than that of Example 1.

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Abstract

The invention discloses an application of employing N and Mo for improving temperature-sensitive characteristics of oxidized graphene. No2 and MoCl3 are employed as doping sources for the doping of the oxidized graphene, and the energy band structure of doped graphene after doping is changed. Moreover, the constraint capability for a functional group is also changed, and the resistance-temperature characteristics of an oxidized graphene material are improved. The method provided by the invention can remarkably reduce the nonlinearity degree of the specific resistance of the oxidized graphene for temperature change, and can enable a corresponding oxidized graphene temperature sensor to obtain a large temperature effective measurement range. The method can remarkably reduce the specific resistance of the oxidized graphene in indoor temperature and low temperature regions, increases feedback currents in the indoor temperature and low temperature regions, and improves the measurement precision. The method carries out subsequent processing after the preparation of the oxidized graphene, which causes no conflict with a specific preparation process of the oxidized graphene. The application is a characteristic enhancement scheme for an oxidized graphene finished product, so the application is high in applicability.

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 characteristics of graphene oxide materials by co-doping, and in particular to the application of N and Mo for improving the temperature-sensitive characteristics of graphene oxide. Background technique [0002] Graphene is a material composed of one or several layers of C atoms, and its C-C bonds are combined with sp2 to form a dense honeycomb lattice structure. Because of 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, because the graphene oxide functional group has adsorption and desorption properties, its resistivity has certain tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/22
Inventor 段理樊继斌于晓晨田野程晓姣何凤妮
Owner CHANGAN UNIV
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