CN106198489B - A kind of molecule knot optical near-field microscopic system and its building method - Google Patents
A kind of molecule knot optical near-field microscopic system and its building method Download PDFInfo
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- CN106198489B CN106198489B CN201610648871.3A CN201610648871A CN106198489B CN 106198489 B CN106198489 B CN 106198489B CN 201610648871 A CN201610648871 A CN 201610648871A CN 106198489 B CN106198489 B CN 106198489B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q60/00—Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
- G01Q60/18—SNOM [Scanning Near-Field Optical Microscopy] or apparatus therefor, e.g. SNOM probes
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Abstract
Molecule knot optical near-field microscopic system of the invention, including microscope, high vacuum cavity, spectroanalysis instrument, current detecting system, high-voltage amplifier, computer and quartz glass needle point, the microscope is connected with high vacuum cavity, spectroanalysis instrument and computer respectively, the current detecting system and high-voltage amplifier is connected between high vacuum cavity and computer, the spectroanalysis instrument is also connected with computer, and the quartz glass needle point is arranged in the top of high vacuum cavity by bracket and is located at microscopical lower section.By above-mentioned, molecule knot optical near-field microscopic system of the invention and its building method, novel molecular knot optical near-field microscopic system has been constructed by enhancing two kinds of technical principles using electron tunneling effect and near field needle point tip, it is successfully realized the electrical signal of unimolecule knot in situ and the collaboration test of optical signalling, optical near-field microscope can be used for a variety of analyses and research based on unimolecule organic photoelectric characteristic device.
Description
Technical field
The present invention is a kind of molecule knot optical near-field microscopic system (Molecular junction near field
Spectroscopy) test macro is constructed by enhancing two kinds of technical principles using electron tunneling effect and near field needle point tip
Novel molecular knot optical near-field microscopic system is successfully realized the collaboration test for realizing minute yardstick optical signal and electric signal.
Background technique
As unimolecule measuring technology and means are constantly progressive, a variety of advanced technology (such as atomic force microscope, scanning-tunnellings
Microscope and needle point enhancing near-field microscope etc.) be applied to organic semiconductor small molecule, large biological molecule test and answer
With.Molecules align, electric charge transfer and optical Quality Research are functionalized nano technical research in recent years under the conditions of minute yardstick
Emphasis.The research of single molecules apparatus electric charge transfer is mainly realized by high resolution scanning tunnel microscope, it is especially electric
I-E characteristic in lotus transfer process, which not only reflects, surrounds and watches the distribution of intramolecule cloud density, also reflects simultaneously
Electronics transmission characteristic in the molecule (as described in document 1,2).However, in order to deeper into probe into minute yardstick molecular relativity matter,
Sensitiveer means of testing is badly in need of being developed.Needle point enhancing near-field microscope is that one kind of test ultra micro scale optical property is micro-
Mirror.The microscope is particularly suitable for test needle point using the enhancing of needle point near field principle test regional area (being less than 8nm) optical signal
Enhance Raman spectrum (as described in document 3,4).Within the scope of micro-scale, tests the special nature of single small molecule, prepares too
Positive energy battery, organic electroluminescent and organic field effect tube device all have high difficulty, survey under molecular scale
The innovative equipment that examination optical signal, electric signal and photoelectric-synergetic response property then need high-tech background to support.
The above document:
1、Rev. Phys. Chem. 2006, 57, 593;
2、Nature 2000, 408, 541
3、Physical review letters 2004, 92,96101;
4、Ultramicroscopy 1984, 13, 227。
Summary of the invention
The invention mainly solves the technical problem of providing a kind of molecule knot optical near-field microscopic systems, by utilizing electricity
Sub- tunneling effect and near field needle point tip enhance two kinds of technical principles and have constructed novel molecular knot optical near-field microscopic system, at
Function, which realizes the electrical signal of unimolecule knot in situ and the collaboration test of optical signalling, this optical near-field microscope, can be used for
A variety of analyses and research based on unimolecule organic photoelectric characteristic device.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: it is close to provide a kind of molecule knot optics
Microscopic system, including microscope, high vacuum cavity, spectroanalysis instrument, current detecting system, high-voltage amplifier, computer with
And quartz glass needle point, the microscope are connected with high vacuum cavity, spectroanalysis instrument and computer respectively, the electricity
Current test system and high-voltage amplifier are connected between high vacuum cavity and computer, the spectroanalysis instrument also with computer
It is connected, the microscope includes lens, reflecting mirror and spectroscope, and the reflecting mirror and spectroscope are separately positioned on
Between mirror, lens are additionally provided between the reflecting mirror and spectroscope, the quartz glass needle point is arranged by bracket
The top of high vacuum cavity is simultaneously located at microscopical lower section.
In a preferred embodiment of the present invention, the high vacuum cavity includes substrate and piezoelectric ceramics, the base
The top of piezoelectric ceramics is arranged in bottom.
In a preferred embodiment of the present invention, the quartz glass needle point uses the table of the quartz glass of triangular prism-shaped
The preparation of 20-40 nano-Au films is deposited in face.
In a preferred embodiment of the present invention, the molecule knot optical near-field microscopic system further includes He-Ne Lasers
Device, the microscope pass through optical fiber respectively and are connected with He-Ne laser and spectroanalysis instrument.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: it is close to provide a kind of molecule knot optics
The building method of field microscopic system, comprising the following specific steps
Step 1: preparing quartz glass needle point using quartz glass angle
Quartz glass is cut into 4 millimeters of equilateral triangles of side length and is used to prepare needle point, the stone of triangular prism-shaped will be cut into
The surface vapor deposition 20-40 nano-Au films of English glass prepare quartz glass needle point, use quartz glass needle point as electrical signal detection
With light guide circulation passage, when the laser of He-Ne laser converges to the tip of quartz glass needle point by rigid resolution microscopy,
The tip of quartz glass needle point will generate high near field intensity, when this near field, enhancement effect is used in testing for spectrum test
It will realize the test of near field enhanced spectrum；
Step 2: realizing unimolecule junction current-voltage tester using electron tunneling effect principle under minute yardstick
The quartz glass needle point of preparation is fixed on bracket, control piezoelectric ceramics makes to be fixed on to be moved down in substrate above
It is dynamic, when distance is close enough between quartz glass needle point and substrate, it will be observed that tunnelling current, when quartz glass needle point and substrate
Distance further shortens the length for reaching molecule knot, and quartz glass needle point is contacted with the molecule realization in substrate, realizes molecule knot
Construct behavior, it is after molecular structure is built, i.e., controllable to be applied to the voltage that molecule is tied, test its Current Voltage row
For；
Step 3: utilizing quartz glass Tip-Enhanced Raman Spectroscopy technology, constructed the tip enhancing light of quartz glass needle point
Spectrum testing system
The laser of He-Ne laser is introduced in high vacuum cavity using spectroscope, and passes through high-resolution object lens for He-Ne
The laser of laser converges at the tip of quartz glass needle point, and strong in the tip of the quartz glass needle point extremely strong near field of generation
Degree, realizes the test of the single molecule optical signal at the tip of quartz glass needle point, meanwhile, stone is acquired using high-resolution object lens
The spectroanalysis instrument that optical signal imports low temperature is finally carried out spectrum analysis by the tip optical signal of English glass needle point；
Step 4: the electrical signal of unimolecule knot in situ and the collaboration test of optical signalling
Unimolecule knot is constructed by controlling substrate level, driving voltage, test current-voltage letter are applied to unimolecule knot
Number, meanwhile, Tip-Enhanced Raman Spectroscopy is tested at the tip that the laser of He-Ne laser guides to quartz glass needle point, is realized with this
The collaboration of molecule knot electric signal and optical signal is tested.
In a preferred embodiment of the present invention, the quartz glass with a thickness of 0.2 millimeter.
In a preferred embodiment of the present invention, the length of the molecule knot is 0.2 nanometer.
The beneficial effects of the present invention are: a kind of molecule knot optical near-field microscopic system of the invention and its building method,
It is aobvious by having constructed novel molecular knot optical near-field using electron tunneling effect and near field needle point tip two kinds of technical principles of enhancing
Micromirror systems, are successfully realized the electrical signal of unimolecule knot in situ and the collaboration test of optical signalling, this optical near-field are aobvious
Micro mirror can be used for a variety of analyses and research based on unimolecule organic photoelectric characteristic device.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, in which:
Fig. 1 is the structural block diagram of optical storage near-field microscope system；
Fig. 2 is gold atom conductive test schematic diagram；
Fig. 3 is Raman spectrum needle point enhancing signal testing wavelength relationship figure；
Fig. 4 is Raman spectrum needle point enhancing signal testing distance relation figure.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
As shown in Figure 1, the embodiment of the present invention includes:
A kind of molecule knot optical near-field microscopic system, including microscope, high vacuum cavity, spectroanalysis instrument, electric current are surveyed
Test system, high-voltage amplifier, computer and quartz glass needle point, the microscope respectively with high vacuum cavity, spectrum analysis
Instrument and computer are connected, the current detecting system and high-voltage amplifier be connected to high vacuum cavity and computer it
Between, the spectroanalysis instrument is also connected with computer, and the microscope includes lens, reflecting mirror and spectroscope, described
Reflecting mirror and spectroscope be separately positioned between lens, be additionally provided with lens between the reflecting mirror and spectroscope, it is described
Quartz glass needle point by bracket be arranged in high vacuum cavity top and be located at microscopical lower section.
Among the above, the high vacuum cavity includes substrate and piezoelectric ceramics, and piezoelectric ceramics is arranged in the substrate
Top.
Wherein, the quartz glass needle point is thin using the surface vapor deposition 20-40 nanogold of the quartz glass of triangular prism-shaped
Film preparation.
Further, the molecule knot optical near-field microscopic system further includes He-Ne laser, the microscope
It is connected respectively by optical fiber with He-Ne laser and spectroanalysis instrument.
The present invention also provides a kind of building methods of molecule knot optical near-field microscopic system, including walk in detail below
It is rapid:
Step 1: preparing quartz glass needle point using quartz glass angle
Quartz glass is cut into 4 millimeters of equilateral triangles of side length and is used to prepare needle point, the stone of triangular prism-shaped will be cut into
The surface vapor deposition 20-40 nano-Au films of English glass prepare quartz glass needle point, use quartz glass needle point as electrical signal detection
With light guide circulation passage, when the laser of He-Ne laser converges to the tip of quartz glass needle point by rigid resolution microscopy,
The tip of quartz glass needle point will generate high near field intensity, when this near field, enhancement effect is used in testing for spectrum test
It will realize the test of near field enhanced spectrum；
Step 2: realizing unimolecule junction current-voltage tester using electron tunneling effect principle under minute yardstick
The quartz glass needle point of preparation is fixed on bracket, control piezoelectric ceramics makes to be fixed on to be moved down in substrate above
It is dynamic, when distance is close enough between quartz glass needle point and substrate, it will be observed that tunnelling current, when quartz glass needle point and substrate
Distance further shortens the length for reaching molecule knot, and quartz glass needle point is contacted with the molecule realization in substrate, realizes molecule knot
Construct behavior, it is after molecular structure is built, i.e., controllable to be applied to the voltage that molecule is tied, test its Current Voltage row
For；
Step 3: utilizing quartz glass Tip-Enhanced Raman Spectroscopy technology, constructed the tip enhancing light of quartz glass needle point
Spectrum testing system
The laser of He-Ne laser is introduced in high vacuum cavity using spectroscope, and passes through high-resolution object lens for He-Ne
The laser of laser converges at the tip of quartz glass needle point, and strong in the tip of the quartz glass needle point extremely strong near field of generation
Degree, realizes the test of the single molecule optical signal at the tip of quartz glass needle point, meanwhile, stone is acquired using high-resolution object lens
The spectroanalysis instrument that optical signal imports low temperature is finally carried out spectrum analysis by the tip optical signal of English glass needle point；
Step 4: the electrical signal of unimolecule knot in situ and the collaboration test of optical signalling
Unimolecule knot is constructed by controlling substrate level, driving voltage, test current-voltage letter are applied to unimolecule knot
Number, meanwhile, Tip-Enhanced Raman Spectroscopy is tested at the tip that the laser of He-Ne laser guides to quartz glass needle point, is realized with this
The collaboration of molecule knot electric signal and optical signal is tested.
Among the above, the quartz glass with a thickness of 0.2 millimeter；The length of the molecule knot is 0.2 nanometer.
The present invention provides the devices that one kind can measure unimolecule spectral property and electrical properties simultaneously, as shown in Figure 1.
The optics and electrical testing of molecule knot realize (~ 10-7 millibars) under UHV condition, pass through autonomous Design circuit drives system
System, the instrument realize constructing for stable molecule knot, and real-time testing molecule junction voltage-current characteristics.Pass through autonomous Design
Optical platform and signal collection system are realized and are tested the monomolecular optical signalling in the tip of quartz glass needle point.Finally, originally
Invention combines both measuring technologies, realizes the electrical signal of unimolecule knot in situ and the collaboration test of optical signalling.This
Invention provides a kind of single molecules level optical near-field microscope and its building method, this optical near-field microscope and can use
In a variety of analyses and research based on unimolecule organic photoelectric characteristic device.
The needle point in the instrument is prepared using quartz glass angle.Quartz glass thickness is about 0.2 millimeter, is cut into side
Long 4 millimeters of equilateral triangles are used to prepare needle point.To be cut into the quartz glass of triangular prism-shaped surface (triangular prism-shaped glass
Two side surfaces and bottom surface) vapor deposition 20-40 nano-Au films prepare molecule class survey needle point.Utilize this gold-plated quartz glass
Needle point is as electrical signal detection and light guide circulation passage.This needle surface is due to having the film of gold, in addition to having electric conductivity,
It is also equipped with good light conduction characteristic.When laser converges to needle point tip by rigid resolution microscopy, needle point tip will be generated
High near field intensity will be carried out near field enhanced spectrum when enhancement effect is used in testing for spectrum test when this near field
Test.The core of foregoing invention is exactly dexterously to be combined together laser Raman spectroscopy and STM using gold-plated glass needle point,
And realize the test of near field enhanced spectrum.
Unimolecule junction current-voltage tester is realized using electron tunneling effect principle under minute yardstick.The present invention is using fixation
Needle point, relative distance between the control substrate method control needle point moved up and down and substrate.The present invention is by the quartz glass needle of preparation
Point is fixed on bracket, and control piezoelectric ceramics makes to be fixed on that substrate moves up and down above.When distance is enough between needle point and substrate
When close, it will be observed that tunnelling current.Reach molecule knot length when needle point and substrate distance further shorten, about 0.2 nanometer
When left and right, needle point is contacted with the molecule realization in substrate, and that realizes molecule knot constructs behavior.After molecular structure is built, i.e.,
It is controllable to be applied to the voltage that molecule is tied, test its Current Voltage behavior.Firstly, the design of fixed needle point can guarantee for a long time
Stablize above substrate, improves molecule knot stability.It is moved secondly, controlling substrate by High Precision Piezoelectric Ceramic and current amplifier
It moves to realize constructing and separating for molecule knot.Finally, being sacrificed by way of breaking through tradition and retouching tunnel microscope (STM) concept
X, the control in Y-direction to substrate, realizes the high stability of needle point Yu substrate relative position.
Using Tip-Enhanced Raman Spectroscopy technology, needle point tip enhanced spectrum test macro has been constructed.The instrument, which utilizes, to be divided
Light microscopic introduces laser (633nm) in vacuum chamber, and laser is converged at needle point tip by high-resolution object lens.And in needle point
Tip generates extremely strong near field intensity.In near field under the action of enhancement effect, this instrument realizes the unimolecule light at needle point tip
Learn the test of signal.Meanwhile needle point tip optical signal is acquired using high-resolution object lens, optical signal is finally imported into low temperature spectra
Analyzer carries out spectrum analysis.By introducing quartz glass needle point, the present invention, which effectively reduces, enhances Raman at needle point tip
Behavior is quenched in common spectrum in spectral technique.This feature ensure that the steady of during molecule knot spectrum test molecule knot
It is fixed.
Another distinguishing feature of the invention successfully combines above two advanced experimental technique.It is high by control substrate
Degree constructs unimolecule knot, applies driving voltage to unimolecule knot, tests current-voltage signal.Meanwhile laser is guided into needle point point
End test Tip-Enhanced Raman Spectroscopy.The collaboration test of molecule knot electric signal and optical signal is realized with this.
Choosing three directions below, the present invention is further elaborated, and proves application effect of the present invention, rather than wants
It is limited the invention with this.
Embodiment 1: performance testing is connected in single gold atom
This experiment is using gold thin film as substrate, and the electric current of time is by real-time monitoring between needle point and gold substrate.In needle point and base
Apply the voltage of 10 mW between bottom, gold substrate is constantly mobile to needle point under the control of piezoelectric ceramics.When needle point and substrate reach
When to a specific range, electric current is tunneled through.After needle point and substrate thoroughly contact, exponentially property enhances rapidly electric current.So
Substrate is slowly moved down afterwards, and needle point is contacted with substrate at this time realizes step-like electric current change as shown in Figure 2 close to closely separating
Change.In Fig. 2, abscissa shows the distance change between needle point and substrate of testing time and piezoelectric ceramics voltage secondary indication simultaneously
Change.Ordinate indicates quantum transport property between needle point and substrate, i.e., the gold atom number between needle point and substrate.
The experiment shows that near field optic needle point used in this instrument has reached the acuity of single gold atom rank.Platform
The stabilization time of stepwise electric current can confirm that molecule organic semiconductor can keep for a long time stable between needle point and substrate
Contact.
Embodiment 2: pinpoint enhanced Raman microscope test
The experiment constructs monolayer in gold surface with isothiocyano-malachite green molecule, and as experiment substrate.Work as needle
When distance realizes tunnelling current between point and substrate, its Tip-Enhanced Raman Spectroscopy is tested, as shown in Figure 3.At this point, its Raman spectrum
Relative to needle point far from substrate in the case where spectral intensity significantly increase.Raman spectrum characteristic peak position is obvious.Therefore, the present invention is real
The test of needle point tip enhancing Raman spectrum is showed.It is horizontal preferably to test accurate manipulation of the invention, further test needle point
The correlation between distance and spectral intensity between substrate, as shown in Figure 4.When needle point and substrate distance are less than 15 nm, needle point increases
It is by force that can both be observed.As needle point constantly reduces with substrate distance, the near field intensity of needle point constantly enhances, and needle point increases
Strong raman spectrum strength constantly enhances therewith.It can be found that only needle point tip sub-fraction molecule is exposed to the increasing of needle point near field
Under strong, and form needle point tip enhancing Raman spectrum.Realize test unimolecule rank Raman light mentioned in the present invention
The test target of spectrum.
In conclusion a kind of molecule knot optical near-field microscopic system of the invention and its building method, pass through and utilize electricity
Sub- tunneling effect and near field needle point tip enhance two kinds of technical principles and have constructed novel molecular knot optical near-field microscopic system, at
Function, which realizes the electrical signal of unimolecule knot in situ and the collaboration test of optical signalling, this optical near-field microscope, can be used for
A variety of analyses and research based on unimolecule organic photoelectric characteristic device.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (4)
1. a kind of molecule knot optical near-field microscopic system, which is characterized in that including microscope, high vacuum cavity, spectrum analysis
Instrument, current detecting system, high-voltage amplifier, computer and quartz glass needle point, the microscope respectively with high vacuum cavity,
Spectroanalysis instrument and computer are connected, the current detecting system and high-voltage amplifier be connected to high vacuum cavity and
Between computer, the spectroanalysis instrument is also connected with computer, and the microscope includes lens, reflecting mirror and light splitting
Mirror, the reflecting mirror and spectroscope are separately positioned between lens, are additionally provided between the reflecting mirror and spectroscope
Mirror, the quartz glass needle point are arranged in the top of high vacuum cavity by bracket and are located at microscopical lower section, wherein institute
20-40 nano-Au films system is deposited using two side surfaces of the quartz glass of triangular prism-shaped and bottom surface in the quartz glass needle point stated
It is standby；The high vacuum cavity includes substrate and piezoelectric ceramics, and the top of piezoelectric ceramics is arranged in the substrate；Point
Son knot optical near-field microscopic system further includes He-Ne laser, the microscope pass through respectively optical fiber and He-Ne laser and
Spectroanalysis instrument is connected.
2. the building method of molecule knot optical near-field microscopic system according to claim 1, which is characterized in that including with
Lower specific steps:
Step 1: preparing quartz glass needle point using quartz glass angle
Quartz glass is cut into 4 millimeters of equilateral triangles of side length and is used to prepare needle point, the quartzy glass of triangular prism-shaped will be cut into
Two side surfaces of glass and bottom surface vapor deposition 20-40 nano-Au films prepare quartz glass needle point, use quartz glass needle point as electricity
Signal detection and light guide circulation passage, when the laser of He-Ne laser converges to quartz glass needle point by rigid resolution microscopy
When tip, the tip of quartz glass needle point will generate high near field intensity, and when this near field, enhancement effect is used in testing for light
The test of near field enhanced spectrum will be realized when spectrum test；
Step 2: realizing unimolecule junction current-voltage tester using electron tunneling effect principle under minute yardstick
The quartz glass needle point of preparation is fixed on bracket, control piezoelectric ceramics makes to be fixed on that substrate moves up and down above,
When distance is close enough between quartz glass needle point and substrate, it will be observed that tunnelling current, when quartz glass needle point and substrate away from
From the length that further shortening reaches molecule knot, quartz glass needle point is contacted with the molecule realization in substrate, realizes molecule knot
Behavior is constructed, it is after molecular structure is built, i.e., controllable to be applied to the voltage that molecule is tied, test its Current Voltage behavior；
Step 3: utilizing quartz glass Tip-Enhanced Raman Spectroscopy technology, the tip enhanced spectrum for having constructed quartz glass needle point is surveyed
Test system
The laser of He-Ne laser is introduced in high vacuum cavity using spectroscope, and passes through high-resolution object lens for He-Ne Lasers
The laser of device converges at the tip of quartz glass needle point, and generates extremely strong near field intensity at the tip of quartz glass needle point, real
Show the test of the single molecule optical signal at the tip of quartz glass needle point, meanwhile, quartzy glass is acquired using high-resolution object lens
The spectroanalysis instrument that optical signal imports low temperature is finally carried out spectrum analysis by the tip optical signal of glass needle point；
Step 4: the electrical signal of unimolecule knot in situ and the collaboration test of optical signalling
Unimolecule knot is constructed by controlling substrate level, driving voltage is applied to unimolecule knot, tests current-voltage signal, together
When, Tip-Enhanced Raman Spectroscopy is tested at the tip that the laser of He-Ne laser guides to quartz glass needle point, molecule is realized with this
Tie the collaboration test of electric signal and optical signal.
3. the building method of molecule knot optical near-field microscopic system according to claim 2, which is characterized in that described
Quartz glass with a thickness of 0.2 millimeter.
4. the building method of molecule knot optical near-field microscopic system according to claim 3, which is characterized in that described
The length of molecule knot is 0.2 nanometer.
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