Method for detecting photochemical activity of carbon nano tube by utilizing transient absorption spectrum technology

A technology of photochemical activity and carbon nanotubes, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem of inability to quickly and accurately judge carbon nanotubes, and achieve the effect of low detection cost, significant difference, and accurate and reliable results

Inactive Publication Date: 2013-03-13
NANJING UNIV
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Problems solved by technology

[0007] Aiming at the problem that the current detection methods under steady-state conditions cannot quickly and accurately judge whether carbon nanotubes have photoresponsive ability in a specific solution system, the present invention provides a method for detecting carbon nanotube photochemical The active method, for

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  • Method for detecting photochemical activity of carbon nano tube by utilizing transient absorption spectrum technology
  • Method for detecting photochemical activity of carbon nano tube by utilizing transient absorption spectrum technology
  • Method for detecting photochemical activity of carbon nano tube by utilizing transient absorption spectrum technology

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Embodiment 1

[0034] A method for detecting the photochemical activity of carbon nanotubes using transient absorption spectroscopy, the method comprising the following steps:

[0035]a. To prepare an aqueous solution of carbon nanotubes, weigh 1 mg of single-walled carbon nanotubes (S-SWNTs) and dissolve them in 25 mL of ultrapure water, and sonicate them with an ultrasonic cleaner. The purpose of ultrasonic treatment is to better disperse carbon nanotubes in aqueous solution. Generally speaking, the longer the ultrasonic time, the better the dispersion effect of carbon nanotubes. The carbon nanotubes with hydroxyl, carboxyl and other polar functional groups on the surface need shorter ultrasonic dispersion time than the original carbon nanotubes. Therefore, the time of ultrasonic treatment can be 1-2 h, and the preferred choice of ultrasonic treatment in this embodiment is 2 h. After standing still, the supernatant of the carbon nanotube aqueous solution is taken as the detection object;...

Embodiment 2

[0040] A method for detecting the photochemical activity of carbon nanotubes using transient absorption spectroscopy, the method comprising the following steps:

[0041] a. To prepare an aqueous solution of carbon nanotubes, weigh 1 mg of multi-walled carbon nanotubes (MWNT-OH) containing 3.7% hydroxyl groups on the surface and dissolve them in 25 mL of ultrapure water, and then use an ultrasonic cleaner to sonicate for 1 h. Stand still and take the supernatant as the detection object.

[0042] b. Use a laser flash photolysis instrument to analyze the photochemical properties of the carbon nanotube aqueous solution under light conditions; take 2 mL of the supernatant of the carbon nanotube aqueous solution prepared in step a and transfer it into the sample cell of the laser flash photolysis instrument, and then Perform laser photolysis experiments.

[0043] c. Use the pulse radiolysis device to verify and analyze the characteristic peaks of the carbon nanotube transient absor...

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Abstract

The invention relates to a method for detecting photochemical activity of a carbon nano tube by utilizing a transient absorption spectrum technology and belongs to the field of photochemical activity detection of carbon nano tubes. The method comprises the following steps: a, preparing aqueous solution of the carbon nano tube, ultrasonically treating the aqueous solution of the carbon nano tube, standing, and taking supernatant liquid of the aqueous solution of the carbon nano tube as a detection object; b, analyzing photochemical properties of the aqueous solution of the carbon nano tube under illumination conditions by utilizing a laser flash photolysis instrument; and c, verifying and analyzing a characteristic peak of the transient absorption spectrum of the carbon nano tube obtained by the laser flash photolysis instrument in step b by utilizing a pulse radiolysis device. According to the detection method, aiming at a special carbon-based nano material such as the carbon nano tube, the photochemical activity particles in the aqueous solution can be conveniently and reliably detected, the carbon nano tube is insensitive to interference of an external environment, and a carbon nano tube sample is not required to be excessively modified and treated in the earlier stage.

Description

technical field [0001] The invention belongs to the field of photochemical activity detection of carbon nanotubes, and more specifically relates to a method for detecting photochemical activity of carbon nanotubes by using transient absorption spectrum technology. Background technique [0002] Carbon nanotubes, like diamond, graphite, and fullerene, are also an allotrope of carbon. It is a long tube-shaped tube wall molecule, generally a coaxial tube formed by carbon atoms arranged in a hexagonal manner and then curled. If the tube is composed of only a single layer of carbon atoms, it is called a single-walled carbon nanotube, and when the tube is composed of multiple layers of carbon atoms, it is called a multi-walled carbon nanotube. Carbon nanotubes have the characteristics of large specific surface area, high hardness and thermal stability. In addition, because it is evolved from graphite, there are many unpaired free electrons on its tube wall, so carbon nanotubes al...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 张淑娟朱敦学刘犀通潘丙才张炜铭吕路
Owner NANJING UNIV
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