CN101308084A - Method for discriminating sample for containing tiny semiconductor carbon nanometer tube bundle or not - Google Patents
Method for discriminating sample for containing tiny semiconductor carbon nanometer tube bundle or not Download PDFInfo
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- CN101308084A CN101308084A CNA2007100992882A CN200710099288A CN101308084A CN 101308084 A CN101308084 A CN 101308084A CN A2007100992882 A CNA2007100992882 A CN A2007100992882A CN 200710099288 A CN200710099288 A CN 200710099288A CN 101308084 A CN101308084 A CN 101308084A
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Abstract
The invention provides a method for identifying whether a sample contains micro semiconductor carbon nano-tube bundle or not, which is characterized in that the method comprises: testing an absorption spectrum or Raman spectrum of a single-wall carbon nano-tube sample; confirming a band gap of a semiconductor carbon nano-tube in the single-wall carbon nano-tube sample according to the absorption spectrum or Raman spectrum; selecting an exciting light matched with an exciton energy level corresponding to a semiconductor carbon nano-tube electronic energy level with rather broad band gap to excite the photoluminescence spectrum of the single-wall carbon nano-tube sample; and judging whether the single-wall carbon nano-tube sample contains micro semiconductor carbon nano-tube bundle or not according to whether or not the photoluminescence spectrum has fluorescence signals from the semiconductor carbon nano-tube with rather narrow band gap.
Description
Technical field
The present invention relates to component and structure how to utilize absorption spectrum and photoluminescence spectra to characterize liquid and membraneous material, be meant especially whether a kind of sample of differentiating contains the method for tiny semiconductor carbon nanometer tube bundle
Background technology
Single Walled Carbon Nanotube is a kind of tubular structure that surrounds by by the Graphene lamella.Single Walled Carbon Nanotube can be passed through texture index, and (n m) characterizes.The diameter of Single Walled Carbon Nanotube changes to several nanometers from 0. 5 nanometers always.A Single Walled Carbon Nanotube of/3rd has metallicity, and other 2/3rds Single Walled Carbon Nanotube has semiconductive.Because the diameter Distribution scope of Single Walled Carbon Nanotube is very wide, makes the band gap of semiconductor single-walled carbon change to far infrared from visible light.With respect to other nano material, Single Walled Carbon Nanotube has the character of a lot of uniquenesses.But because that the Van der Waals between Single Walled Carbon Nanotube interacts is very strong, single Single Walled Carbon Nanotube is easy to assemble and becomes the big and small carbon nanotube bundles of size.The existence of carbon nanotube bundles has changed optical property and other physical propertys thereof of Single Walled Carbon Nanotube significantly.For example, the exciton that studies show that carbon nanotube bundles has more relaxation passage; Carbon nanotube bundles has shielding action to single Single Walled Carbon Nanotube wherein, thereby has changed the exciton bind energy of single Single Walled Carbon Nanotube in the carbon nanotube bundles significantly; Metal carbon nanotube around the photoproduction exciton of semiconductor carbon nanometer tube is easy to be tunneling in the carbon nanotube bundles, thus the luminescence efficiency of semiconductor carbon nanometer tube in the carbon nanotube bundles may have been reduced.Therefore, study the physical property of single Single Walled Carbon Nanotube exactly, just must seek a kind of method for accurate testing differentiates whether the Single Walled Carbon Nanotube sample only contains single Single Walled Carbon Nanotube.On the other hand, carbon nanotube bundles, particularly semiconductor carbon nanometer tube bundle have a lot of potential application, such as, if carbon nanotube bundles mainly is made of semiconductor carbon nanometer tube, then carbon nanotube bundles can be used for improving the luminescence efficiency of narrow gap semiconductor carbon nano-tube.Therefore, need also conversely to differentiate whether the Single Walled Carbon Nanotube sample contains tiny semiconductor carbon nanometer tube bundle.
With respect to single Single Walled Carbon Nanotube, blue shift can take place in the Raman mould frequency of carbon nanotube bundles, and red shift then takes place the band gap of Single Walled Carbon Nanotube in the carbon nanotube bundles.But, when utilizing this method to characterize existing of carbon nanotube bundles, a reference standard must be arranged.Single Single Walled Carbon Nanotube shows different character under different environment, this just causes reference standard to be difficult to determine.The more important thing is, when the diameter of carbon nanotube bundles very hour, the skew of raman frequency and band gap is very not remarkable.Therefore, there is so a kind of method in urgent hope, and it can directly judge whether contain tiny semiconductor carbon nanometer tube bundle in the Single Walled Carbon Nanotube sample without any need for reference standard.
Summary of the invention
The object of the present invention is to provide a kind of sample of differentiating whether to contain the method for tiny semiconductor carbon nanometer tube bundle, utilize this method, can differentiate very directly whether sample contains tiny semiconductor carbon nanometer tube bundle, and not need any reference standard.
The invention provides a kind of sample of differentiating and whether contain the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that this method comprises:
The absorption spectrum or the Raman spectrum of test Single Walled Carbon Nanotube sample;
Determine the band gap of semiconductor carbon nanometer tube in the Single Walled Carbon Nanotube sample according to absorption spectrum or Raman spectrum;
Select with than wide band gap semiconducter carbon nano electronic energy level the exciting light that is complementary of corresponding exciton level excite the photoluminescence spectra of Single Walled Carbon Nanotube sample;
Judge according to whether existing in the photoluminescence spectra whether the Single Walled Carbon Nanotube sample contains tiny semiconductor carbon nanometer tube bundle from the fluorescence signal of narrow band gap semiconductor carbon nanometer tube.
If wherein sample comprises carbon nanotube bundles, the mean diameter of every carbon nanotube bundles greatly about 2 nanometers between 20 nanometers.
Wherein the absorption spectrum measurement range of sample in 400 nanometers between 2500 nanometers.
Wherein absorption spectrum can be determined the band gap of semiconductor carbon nanometer tube in the Single Walled Carbon Nanotube sample per sample.
Wherein the Raman spectrum of sample utilizes one or more of laser rays to characterize.
Wherein Raman spectrum per sample can be determined the diameter Distribution of semiconductor carbon nanometer tube, and the band gap of semiconductor carbon nanometer tube in definite sample.
Wherein during the photoluminescence spectra of specimen, excite light wavelength will be complementary than the pairing exciton level of wide band gap semiconducter carbon nano electronic energy level.
Wherein the photoluminescence spectra measurement range of sample in 800 nanometers between 2500 nanometers.
Wherein the concrete measurement range of photoluminescence spectra is the wavelength coverage that is covered between the narrow band gap wavelength in excitation wavelength and the semiconductor carbon nanometer tube.
If wherein there is the photoluminescence signal of narrow band gap semiconductor carbon nanometer tube in the photoluminescence spectra of sample, just contain tiny semiconductor carbon nanometer tube bundle in the interpret sample.
Whether a kind of sample of differentiating of the present invention contains the method for nano semiconductor carbon nano-tube bundle, be mainly used in well discrete, the Single Walled Carbon Nanotube solution that may have the nano semiconductor carbon nano-tube bundle, the standard of single-wall carbon nanotube composite and single wall carbon nano-tube film and discriminating.
Description of drawings
For further specifying content of the present invention and characteristics, below in conjunction with drawings and Examples the inventive method is done a detailed description, wherein:
Fig. 1 is the Raman spectrum of the Single Walled Carbon Nanotube solution that excited of 514.5 nanometer lasers.
Fig. 2 is the absorption spectrum of Single Walled Carbon Nanotube solution.
Fig. 3 is the photoluminescence spectra of the Single Walled Carbon Nanotube solution that excited of 568 and 981 nanometer exciting lights.
Embodiment
Whether a kind of sample of differentiating of the present invention contains the method for tiny semiconductor carbon nanometer tube bundle, and this method comprises:
The absorption spectrum or the Raman spectrum of test Single Walled Carbon Nanotube sample;
Determine the band gap of semiconductor carbon nanometer tube in the Single Walled Carbon Nanotube sample according to absorption spectrum or Raman spectrum;
Select with than wide band gap semiconducter carbon nano electronic energy level the exciting light that is complementary of corresponding exciton level excite the photoluminescence spectra of Single Walled Carbon Nanotube sample; If wherein sample comprises carbon nanotube bundles, the mean diameter of every carbon nanotube bundles greatly about 2 nanometers between 20 nanometers; Wherein the absorption spectrum measurement range of sample in 400 nanometers between 2500 nanometers; Wherein absorption spectrum can be determined the band gap of semiconductor carbon nanometer tube in the Single Walled Carbon Nanotube sample per sample; Wherein the Raman spectrum of sample utilizes one or more of laser rays to characterize; Wherein Raman spectrum per sample can be determined the diameter Distribution of semiconductor carbon nanometer tube, and the band gap of semiconductor carbon nanometer tube in definite sample; Wherein during the photoluminescence spectra of specimen, excite light wavelength will be complementary than the pairing exciton level of wide band gap semiconducter carbon nano electronic energy level; Wherein the photoluminescence spectra measurement range of sample in 800 nanometers between 2500 nanometers;
Judge according to whether existing in the photoluminescence spectra whether the Single Walled Carbon Nanotube sample contains tiny semiconductor carbon nanometer tube bundle from the fluorescence signal of narrow band gap semiconductor carbon nanometer tube; Wherein the concrete measurement range of photoluminescence spectra is the wavelength coverage that is covered between the narrow band gap wavelength in excitation wavelength and the semiconductor carbon nanometer tube, if wherein there is the photoluminescence signal of narrow band gap semiconductor carbon nanometer tube in the photoluminescence spectra of sample, just contain tiny semiconductor carbon nanometer tube bundle in the interpret sample.
As an example, we have discussed the discriminating problem of the tiny semiconductor carbon nanometer tube bundle of the Single Walled Carbon Nanotube solution in discrete neopelex and the heavy water.
The concrete preparation method of Single Walled Carbon Nanotube solution is as follows: a kind of Single Walled Carbon Nanotube that a certain amount of semiconductor carbon nanometer tube content is more joins heavy water, the neopelex that contains 1-2wt% in the heavy water, it is inserted ultrasonic system ultrasonic a few hours, make Single Walled Carbon Nanotube be distributed in the heavy water; The nanotube solution after ultrasonic at once subsequently with 0.7 micron fibrous glass filter paper filtering, and use hydro-extractor centrifugal a few hours immediately, the limpid nanotube solution of taking-up the first half.
We have measured the Raman spectrum of this Single Walled Carbon Nanotube solution under 514.5 nanometer lasers excite, as shown in Figure 1.Raman spectrum has provided several Raman peaks, lays respectively at 372,334,313,307,292,272,263 and 247 wave numbers.According to the energy of exciting light and these Raman peaks the diameter of corresponding Single Walled Carbon Nanotube, can point out these Raman peaks respectively from (5,4), (6,4), (8,2), (6,5), (9,2), (8,4), (8,5) and Single Walled Carbon Nanotube such as (7,7).Wherein the band gap of (6,5) and (8,4) semiconductor carbon nanometer tube lays respectively at about 980 nanometers and 1120 nanometers.
We have measured the near-infrared absorption spectrum of this Single Walled Carbon Nanotube solution, as shown in Figure 2.Observe a lot of absorption peaks in the 900-1300 nanometer range, these absorption peaks are distinguished semiconductor carbon nanometer tube corresponding as that figure indicates.For example, the absorption peak that is positioned at about 980 nanometers and 1120 nanometers corresponds respectively to (6,5) and (8,4) semiconductor carbon nanometer tube.
According to the data of Raman spectrum and absorption spectrum, can judge in this Single Walled Carbon Nanotube sample and contain (8,3), (6,5), (7,5), (8,4), (7,6), (9,5), semiconductor carbon nanometer tube such as (8,7) and (10,5), wherein (8,3), (6,5) and the band gap of (7,5) bigger, and the band gap of other nanotubes is less.Broad-band gap carbon nano-tube (6,5) electron level the wavelength of corresponding exciton level be 568 nanometers and 981 nanometers.Therefore, we select the exciting light of 568 nanometers and 981 nanometers to excite the photoluminescence spectra of Single Walled Carbon Nanotube solution respectively, and the result as shown in Figure 3.If Single Walled Carbon Nanotube solution only contains single semiconductor carbon nanometer tube, owing to have only wide band gap semiconducter carbon nano-tube (6,5) by resonance excitation, the luminous intensity of other semiconductor carbon nanometer tubes should be very little so.But we have observed the fluorescence signal of narrow band gap semiconductor carbon nanometer tube (8,4) and (7,6) under two excitation wavelengths.This explanation contains tiny semiconductor carbon nanometer tube bundle in Single Walled Carbon Nanotube solution, the exciton that is produced in the broad-band gap carbon nano-tube can be transferred to narrow band gap carbon nano-tube and compound at the band edge of narrow band gap carbon nano-tube by dipole-dipole interaction very soon, thereby can observe the fluorescence signal of narrow band gap semiconductor carbon nanometer tube.
Above example explanation, because the dipole-dipole interaction between the semiconductor carbon nanometer tube in the carbon nanotube bundles is very strong, and the effective range of dipole-dipole interaction is a nanometer scale, therefore, differentiate the semiconductor carbon nanometer tube kind that exists in the Single Walled Carbon Nanotube sample by Raman spectrum and absorption spectrum, utilize photoluminescence spectrum then with the exciting light deexcitation sample that is complementary than the pairing exciton level of wide band gap semiconducter carbon nano electronic energy level, if examine the fluorescence signal of narrow band gap semiconductor carbon nanometer tube, just there is the tiny semiconductor nanotube bundle in the instruction book wall carbon nano tube sample, otherwise, just do not have the tiny semiconductor nanotube bundle in the Single Walled Carbon Nanotube sample basically.
The method can be used for differentiating rapidly and accurately whether the Single Walled Carbon Nanotube sample exists the tiny semiconductor nanotube bundle.
Claims (10)
1, whether a kind of sample of differentiating contains the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that this method comprises:
The absorption spectrum or the Raman spectrum of test Single Walled Carbon Nanotube sample;
Determine the band gap of semiconductor carbon nanometer tube in the Single Walled Carbon Nanotube sample according to absorption spectrum or Raman spectrum;
Select with than wide band gap semiconducter carbon nano electronic energy level the exciting light that is complementary of corresponding exciton level excite the photoluminescence spectra of Single Walled Carbon Nanotube sample;
Judge according to whether existing in the photoluminescence spectra whether the Single Walled Carbon Nanotube sample contains tiny semiconductor carbon nanometer tube bundle from the fluorescence signal of narrow band gap semiconductor carbon nanometer tube.
2, whether discriminating sample according to claim 1 contains the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that, if wherein sample comprises carbon nanotube bundles, the mean diameter of every carbon nanotube bundles greatly about 2 nanometers between 20 nanometers.
3, whether discriminating sample according to claim 1 contains the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that, wherein the absorption spectrum measurement range of sample in 400 nanometers between 2500 nanometers.
4, whether discriminating sample according to claim 3 contains the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that, wherein absorption spectrum can be determined the band gap of semiconductor carbon nanometer tube in the Single Walled Carbon Nanotube sample per sample.
5, whether discriminating sample according to claim 1 contains the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that, wherein the Raman spectrum of sample utilizes one or more of laser rays to characterize.
6, whether discriminating sample according to claim 5 contains the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that, wherein Raman spectrum per sample can be determined the diameter Distribution of semiconductor carbon nanometer tube, and the band gap of semiconductor carbon nanometer tube in definite sample.
7, the method that whether contains tiny semiconductor carbon nanometer tube bundle according to claim 1,4 or 6 described discriminating samples, it is characterized in that, wherein during the photoluminescence spectra of specimen, excite light wavelength will be complementary than the pairing exciton level of wide band gap semiconducter carbon nano electronic energy level.
8, whether contain the method for tiny semiconductor carbon nanometer tube bundle according to claim 1 or 7 described discriminating samples, it is characterized in that, wherein the photoluminescence spectra measurement range of sample in 800 nanometers between 2500 nanometers.
9, whether discriminating sample according to claim 8 contains the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that wherein the concrete measurement range of photoluminescence spectra is the wavelength coverage that is covered between the narrow band gap wavelength in excitation wavelength and the semiconductor carbon nanometer tube.
10, whether discriminating sample according to claim 1 contains the method for tiny semiconductor carbon nanometer tube bundle, it is characterized in that, if wherein there is the photoluminescence signal of narrow band gap semiconductor carbon nanometer tube in the photoluminescence spectra of sample, just contain tiny semiconductor carbon nanometer tube bundle in the interpret sample.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459001A (en) * | 2017-02-20 | 2018-08-28 | 中国科学院青岛生物能源与过程研究所 | A kind of method of rapid quantitatively evaluating difference antibacterials function and effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459001A (en) * | 2017-02-20 | 2018-08-28 | 中国科学院青岛生物能源与过程研究所 | A kind of method of rapid quantitatively evaluating difference antibacterials function and effect |
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Open date: 20081119 |