CN100395172C - Negative light control conductive device based on macroscopical long single-wall or double-wall nano tube bundle - Google Patents
Negative light control conductive device based on macroscopical long single-wall or double-wall nano tube bundle Download PDFInfo
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- CN100395172C CN100395172C CNB2004101018136A CN200410101813A CN100395172C CN 100395172 C CN100395172 C CN 100395172C CN B2004101018136 A CNB2004101018136 A CN B2004101018136A CN 200410101813 A CN200410101813 A CN 200410101813A CN 100395172 C CN100395172 C CN 100395172C
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Abstract
The present invention discloses a negative light control conductive device based on a macroscopical long single-wall or double-wall nano tube bundle, which relates to a photoelectric device. The device comprises a macroscopical long single-wall or double-wall nano tube bundle filament and two metal electrodes, wherein both ends of the long single-wall or double-wall nano tube bundle filament are respectively connected with the two metal electrodes and then the single-wall or double-wall nano tube bundle filament is sealed in a quartz glass cover. When the device works, the two metal electrodes are connected with an external circuit first, and then the middle part of the single-wall or double-wall nano tube bundle filament is directly irradiated by a light beam through the quartz glass cover. Experiments show that the total conductivity of the negative light control conductive device is regulated and controlled by the intensity of an incident light beam, specifically the total conductivity of the device can be increased when the intensity of the light beam is increased; the total conductivity of the device can be decreased when the intensity of the light beam is decreased. However, regardless of the strength of the incident light beam, the change rate of the total conductivity of the device is always less than or equal to zero. The device has the advantages of simple structure and convenient fabrication. The wavelength response range of incident light is from 405 nm to 1064 nm, and the photoelectric response time of the device is less than 1 second.
Description
Technical field
The present invention relates to a kind of optoelectronics device, particularly a kind of design and making of the negative light-operated conductivity apparatus spare that constitutes by the long carbon nano-tube bundle of macroscopic view.
Background technology
Utilize light-operated conductivity apparatus spare can lead the variation of (resistance) value, and then can change the size of the electrical quantities such as curtage in the device, realize purpose with optical means control electrical signal intensity by the electricity in the effective control device of optical instrument; Otherwise, also can be by measuring the size of electrical quantities in the light-operated conductivity apparatus spare, and then detect the intensity that incides the optical signalling on the light-operated conductivity apparatus spare, realization utilizes electrical method to measure the purpose of optical signal intensity, therefore, light-operated conductivity apparatus spare has broad application prospects in the photoelectronics field.Documents and materials show that CNT has special level structure and excellent electricity and optical property.The mature technology of synthetic at present preparation single wall or double-walled carbon nano-tube is varied, for example the inventor is at document [Ci LJ, Wei JQ, Wei BQ, Liang J, Xu CL, and Wu DH, CARBON 2001,39 (3): 329-335] the middle report about preparing the method for SWCN, and at document [Wei JQ, Ci LJ, Jiang B, Li YH, ZhangXF, Zhu HW, Xu CL, and Wu DH, JOURNAL OF MATERIALS CHEMISTRY 2003,13 (6): 1340-1344] the middle technology of preparing of reporting about double-walled carbon nano-tube; Chinese invention patent (publication number: 1456498) also disclose the technology of preparing of double-walled carbon nano-tube.But utilize the design of long single wall of macroscopic view or double-walled carbon nano-tube material and make light-operated conductivity apparatus spare and have not yet to see report.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, easy to make, fast a kind of negative light-operated conductivity apparatus spare of its photoelectric respone time simultaneously.Utilize this light-operated conductivity apparatus spare can lead the variation of (resistance) value, and then can change the size of the electrical quantities such as curtage in the device, realize purpose with optical means control electrical signal intensity by the electricity in the effective control device of optical instrument; Equally also can pass through to measure the size of electrical quantities in the light-operated conductivity apparatus spare, and then detect the intensity that incides the optical signalling on the light-operated conductivity apparatus spare, realize utilizing electrical method to measure the purpose of optical signal intensity.
Technical scheme of the present invention is as follows:
A kind of negative light-operated conductivity apparatus spare based on long single wall of macroscopic view or double-walled carbon nano-tube bundle, it is characterized in that: this negative light-operated conductivity apparatus spare comprises a single wall or double-walled carbon nano-tube synnema and two metal electrodes and quartz glass cover, described single wall or double-walled carbon nano-tube synnema are made of macroscopic view long single wall or double-walled carbon nano-tube bundle, the two ends of single wall or double-walled carbon nano-tube synnema are connected with two metal electrodes respectively, and are encapsulated in the quartz glass cover.
Negative light-operated conductivity apparatus spare based on long single wall of macroscopic view or double-walled carbon nano-tube bundle provided by the present invention has characteristics simple in structure, easy to make.And the lambda1-wavelength response range is wide, can respond the light of 405nm～1064nm wavelength, and its photoelectric respone time was a kind of novel light-operated conductivity apparatus spare less than 1 second simultaneously.Utilize the photoelectric response characteristic of this device, can design other novel optoelectronic sensor and photoelectric detector etc.
Description of drawings
Fig. 1 is the scanning electron microscope image of the used carbon nanotube bundles of the present invention.
Fig. 2 is the scanning electron microscope image of the used double-walled carbon nano-tube bundle of the present invention.
Fig. 3 is the schematic diagram of the light-operated conductivity apparatus spare of the present invention, among the figure: the 1-quartz glass cover; 2-single wall or double-walled carbon nano-tube synnema; The 3-metal electrode; The 4-incident beam.
Fig. 4 is that the electricity of negative light-operated conductivity apparatus spare when laser shines that the present invention is based on the long carbon nanotube bundles of macroscopic view led the response curve of rate of change to the time.
Fig. 5 is that the electricity of negative light-operated conductivity apparatus spare when laser shines that the present invention is based on the long double-walled carbon nano-tube bundle of macroscopic view led the response curve of rate of change to the time.
Tool spare embodiment
Negative light-operated conductivity apparatus spare based on long single wall of macroscopic view or double-walled carbon nano-tube bundle provided by the invention comprises a single wall or double-walled carbon nano-tube synnema 2 and two metal electrodes 3, and wherein single wall or double-walled carbon nano-tube synnema are made of long single wall or the double-walled carbon nano-tube bundle of many macroscopic views.Metal electrode can adopt the electrode of materials such as nickel, silver, copper, tungsten.Preparation method is that the two ends with single wall or double-walled carbon nano-tube synnema 2 are connected with the both positive and negative polarity of metal electrode respectively, then it is encapsulated in the quartz glass cover 1, just constitutes negative light-operated conductivity apparatus spare.During work, earlier metal electrode is connected with external circuit, utilizes a light beam then by the middle part of quartz glass cover direct irradiation at the CNT synnema, like this, total electricity of this device is led the regulation and control that can be subjected to incident beam intensity, and promptly when beam intensity increased, total electricity of device was led and can be descended; Otherwise when beam intensity reduced, total electricity of device was led and can be risen.But incident beam intensity size no matter, total electricity of this device is led rate of change and is less than or equal to zero all the time, so just constitutes negative light-operated conductivity apparatus spare.
Can further understand the present invention below by specific embodiment.
The present invention adopts single wall to be connected with the metallic nickel electrode with double-walled carbon nano-tube synnema (as illustrated in fig. 1 and 2) respectively, constitutes negative light-operated conductivity apparatus spare (as shown in Figure 3).Single-walled nanotube synnema diameter is 20 μ m, and length is 2.23mm, and resistance is 1.23k Ω, and double-walled nanotubes synnema diameter is 35 μ m, and length is 4.52mm, and resistance is 395 Ω.Be respectively the focussed laser beam of 405nm, 532nm, 780nm and 1064nm when inciding the middle part of CNT synnema (as shown in Figure 3) with wavelength, diminish total the electricity of device leads to increase with light intensity.Experimental measurements shows: the electricity that the laser that the device that constitutes for SWCN, every watt of unit power wavelength are 405nm causes is led rate of change and is about-60.2%; The laser that every watt of unit power wavelength is 532nm causes that the electricity of this device leads rate of change and be about-52.8%; The laser that every watt of unit power wavelength is 780nm causes that the electricity of this device leads rate of change and be about-42.6%; The laser that every watt of unit power wavelength is 1064nm causes that the electricity of this device leads rate of change and be about-36.7%.
The electricity that the laser that the device that constitutes for double-walled carbon nano-tube, every watt of unit power wavelength are 405nm causes is led rate of change and is about-15.4%; The laser that every watt of unit power wavelength is 532nm causes that the electricity of this device leads rate of change and be about-39.7%; The laser that every watt of unit power wavelength is 780nm causes that the electricity of this device leads rate of change and be about-78.9%; The laser that every watt of unit power wavelength is 1064nm causes that the electricity of this device leads rate of change and be about-80.5%.
Certainly, total electricity is led rate of change except that the power that depends on incident laser, and also to be subjected to the area of light to account for the factors such as ratio of total surface area relevant with spot diameter, intensity distribution function, carbon nano-tube bundle wire connection, and therefore, concrete device needs independent calibration in use.Lead variation to the response curve (Figure 4 and 5) of time as can be known from the electricity of this light-operated conductivity apparatus spare when laser shines, the photoelectric respone time of this device was less than 1 second.
Claims (1)
1. negative light-operated conductivity apparatus spare based on long single wall of macroscopic view or double-walled carbon nano-tube bundle, it is characterized in that: this negative light-operated conductivity apparatus spare comprises a single wall or double-walled carbon nano-tube synnema and two metal electrodes and quartz glass cover, described single wall or double-walled carbon nano-tube synnema are made of macroscopic view long single wall or double-walled carbon nano-tube bundle, the length of carbon nanotube bundles silk is 2.23mm, and the length of double-walled carbon nano-tube synnema is 4.52mm; The two ends of single wall or double-walled carbon nano-tube synnema are connected with two metal electrodes respectively, and are encapsulated in the quartz glass cover.
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| CNB2004101018136A CN100395172C (en) | 2004-12-24 | 2004-12-24 | Negative light control conductive device based on macroscopical long single-wall or double-wall nano tube bundle |
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| CNB2004101018136A CN100395172C (en) | 2004-12-24 | 2004-12-24 | Negative light control conductive device based on macroscopical long single-wall or double-wall nano tube bundle |
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| CN100395172C true CN100395172C (en) | 2008-06-18 |
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| CN101794837B (en) * | 2010-02-05 | 2011-10-26 | 清华大学 | Photoconductive sensor based on asymmetric different dimensionalities structures |
| CN104372444B (en) * | 2014-01-17 | 2016-04-13 | 江西理工大学 | Overlength carbon nano pipe macroscopic fibres and preparation method thereof and the application in electric arc |
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