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Test method of nanometer carbon material oxides based on ultraviolet-visible spectrophotometry

A nano-carbon material and spectrophotometry technology, applied in the measurement of color/spectral properties, etc., can solve the problems of limited rGO application field, poor dispersion, difficult absorption peaks, etc., to achieve convenient testing process, ensure stability and reliability, and maintain long-term stability. sexual effect

Inactive Publication Date: 2017-09-26
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the reduction degree of GO is high, its dispersion in water is poor and it is easy to agglomerate, resulting in weak UV-visible absorption spectrum signals and difficult absorption peaks.
[0004] In order to solve the above problems, researchers usually deliberately control the reduction degree of GO to meet the test requirements or use solid-phase method for testing; however, when the reduction degree of GO is relatively shallow, although it can be tested, the application of rGO is limited. field, especially in electronic devices; and the use of solid-phase method testing requires a large amount of powdery samples to be tested, which also puts forward higher requirements for testing

Method used

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  • Test method of nanometer carbon material oxides based on ultraviolet-visible spectrophotometry
  • Test method of nanometer carbon material oxides based on ultraviolet-visible spectrophotometry
  • Test method of nanometer carbon material oxides based on ultraviolet-visible spectrophotometry

Examples

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Embodiment 1

[0031] figure 1 It is a flow chart of the steps of the testing method of nano-carbon material oxide based on UV-visible spectrophotometry according to Example 1 of the present invention.

[0032] Specific reference figure 1 , according to the testing method of the nano-carbon material oxide based on ultraviolet-visible spectrophotometry of the present embodiment specifically includes the following steps:

[0033] Step S1 , coating the suspension of carbon nanomaterial oxide on the test support base, and drying the nano carbon material oxide film on the test support base.

[0034] In the present embodiment, the nano-carbon material oxide specifically selects graphene oxide (hereinafter referred to as GO); generally, the amount of GO on the control test bearing seat is 1.7×10 -2 mg / cm 2 ~0.6mg / cm 2 That is, specifically, 0.3mL-1.5mL of GO suspension with a concentration of 0.04mg / mL-4mg / mL can be used, and after drying, a GO film in which GO is the above-mentioned content ca...

Embodiment 2

[0049] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between Example 2 and Example 1 is that in step S1, the concentration of the GO suspension is 0.50 mg / mL, and the volume is 0.6 mL; in step S3, the GO film is placed in an oven, and controlled The temperature was maintained at 200° C. for 1 h to obtain an rGO film; the rest was described in Example 1.

[0050] In this example, the UV-visible absorption spectra of GO before and after the in situ reduction reaction are as follows: image 3 shown. from image 3 It can be seen in (a) that the π-π* transition absorption peak before the reaction in the curve (a) red-shifts from 225.8nm to the 261.92nm of the π-π* transition absorption peak in the (b) curve after the reaction, and the reaction greater than 239nm The absorption intensity is also enhanced compared with that before the reaction, indicatin...

Embodiment 3

[0053] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between Example 3 and Example 1 is that in step S1, the dosage of GO is 0.15 mg, 0.3 mg, 0.6 mg and 2 mg respectively, corresponding to the concentration of 0.5 mg / mL and 1 mg / mL respectively from 300 μL and 2mg / mL GO suspension and 1mL of 2mg / mL GO suspension; the rest are described in Example 1.

[0054] In this example, since the addition of 300 μL is difficult to effectively spread the GO in the GO suspension with a concentration of 1 mg / mL and 2 mg / mL, this operational problem is overcome by continuing to add solvent.

[0055] This shows that the method for testing nano-carbon material oxides based on ultraviolet-visible spectrophotometry according to this embodiment can also realize the control of the concentration of the sample to be tested and the strength of the absorption spectrum signal ...

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Abstract

The invention provides a test method of nanometer carbon material oxides based on ultraviolet-visible spectrophotometry. The method comprises the following steps of coating suspension of the nanometer carbon material oxides onto a test carrying seat to obtain a nanometer carbon material oxide film; performing in-situ reduction treatment to obtain a reducing state nanometer carbon material film; using the ultraviolet-visible spectrophotometry for respectively testing the light absorption performance of the nanometer carbon material film before and after the in-situ reduction treatment; correspondingly obtaining the parameters before the reduction and the parameters after the reduction; comparing the parameters before the reduction and the parameters after the reduction; obtaining the influence of the reduction degree on the light absorption performance and the structure. By using the test method provided by the invention, an interface limitation sample manufacturing method is used, so that the sample to be tested is limited by the interface, so that after the in-situ reduction, the agglomeration phenomenon cannot occur; the long-period stability of the samples of the nanometer carbon material oxides can be maintained, so that the stability and the reliability of the experiment results can be ensured; in addition, great convenience is brought to the test process of the ultraviolet-visible absorption spectrum.

Description

technical field [0001] The invention belongs to the technical field of nano-carbon material oxide testing, and in particular relates to a testing method for nano-carbon material oxide based on ultraviolet-visible spectrophotometry. Background technique [0002] Ultraviolet-visible spectrophotometry is a qualitative, quantitative and structural analysis method established based on the absorption characteristics of the molecules of the measured substance to electromagnetic waves with a wavelength in the range of 200nm to 780nm. Good performance and many other advantages. For example, for carbon nanomaterials, especially when they are used in electronic devices, it is necessary to measure the change of the bandgap width before and after reduction. [0003] Taking graphene oxide (GO for short) as an example, UV-Vis spectrophotometry can characterize the occurrence of its reduction reaction, specifically through the absorption peak corresponding to the π-π* transition (correspon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 申月周园海春喜董欧阳李翔曾金波任秀峰
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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