CN102181891A - Silver nanodendrite surface enhanced Raman scattering (SERS) substrate, and preparation method and application thereof - Google Patents
Silver nanodendrite surface enhanced Raman scattering (SERS) substrate, and preparation method and application thereof Download PDFInfo
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- CN102181891A CN102181891A CN 201110087513 CN201110087513A CN102181891A CN 102181891 A CN102181891 A CN 102181891A CN 201110087513 CN201110087513 CN 201110087513 CN 201110087513 A CN201110087513 A CN 201110087513A CN 102181891 A CN102181891 A CN 102181891A
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Abstract
The invention discloses a silver nanodendrite surface enhanced Raman scattering (SERS) substrate, and a preparation method and application thereof, relating to the technical field of nanomaterial science and Raman detection. The SERS active substrate is of silver dendrites which are distributed evenly, and the three-dimensional sizes of dendrites are adjustable. The preparation method of the invention is characterized in that the silver nanodendrites are electrically deposited on commercially available ITO (Indium-doped Tin Oxide) conductive glass by adopting a constant current deposition method and using a silver nitrate solution as electrolyte without adding any other auxiliary. The preparation method of the invention has the advantages of simple, convenient fast (30s) preparation process, low cost, small current and low voltage, and the silver dendrites can be transferred to any substrate (paper, other metal sheets or plastic sheets). The substrate obtained by the method disclosed by the invention has high stability and ordered and controllable structure, and exhibits quite high sensitivity in Raman spectrum detection.
Description
Technical field
The invention belongs to laser raman detection technique field and nanomaterial science, be specifically related to a kind of silver-colored nanometer dendrite surface enhanced Raman scattering substrate and preparation method thereof.
Background technology
Raman spectroscopy is that what with the Raman effect to be that the basis sets up is probe with the photon, has the molecular structure characterization technology of real non-destructive rapid detection characteristics.Yet because common Raman scattering efficient is very low, a little less than the signal, may produce side effects such as damage or photobleaching by sample if improve laser intensity, when tested molecular conecentration lower, or when surperficial adsorbent detected, conventional Raman detection seems unable to do what one wishes, so need by other auxiliary enhancements.Therefore, surface enhanced Raman scattering spectrum (SERS) arises at the historic moment as the Raman enhancements, and the SERS technology comes from the trace molecular adsorption in Cu, Au, metal-sol and electrode surfaces such as Ag, Raman signal can strengthen 104 ~ 1015 times, wherein reinforcing effect the best of Ag is also commonly used.Since people such as Fleischman found the SERS technology in 1974, surface enhanced Raman technique has become the effective tool of a kind of high-sensitive detection interfacial property and molecular interaction, sign surface molecular absorption behavior and molecular structure, is used widely in the research aspect trace analysis, Molecular Detection, chemical industry, environmental science, biomedical system, nano material and transmitter.
Surface enhanced Raman scattering spectrographic effect and substrate are very close, and the quality of substrate fabrication directly affects surface enhanced Raman scattering spectrographic effect.Commonly used prepare the method that strengthens substrate a lot, and silver sol is use always the most a kind of, and silver sol is a kind of metastable state system, can form behind the adding analysans and be easy to settled aggregate.Cause the colloidal sol aggregation extent to be difficult to determine owing to the consistence of character such as the colloid size in the starting condition, shape, surface topography is difficult to control, this directly causes the less stable of Raman signal, and the surface enhanced Raman scattering spectral signal changes thereupon.At present, the research focus of surface Raman enhancement substrate concentrate on prepare that surface tissue is determined, is evenly distributed, controlled in order 3-D nano, structure silver (as the silver-colored dendrite of three-dimensional) is as at the bottom of the SRES active group, at the bottom of this active group can not only broad dynamicrange in obtain reliable, stable, SRES signal uniformly, and can provide the ideal model with check SRES theory.Yet this substrate preparation generally exists, and cost height, program are loaded down with trivial details, technical sophistication, be difficult to problems such as big area amount, to such an extent as to limited its application at the molecule sensory field.Obtain corresponding 3-D nano, structure silver surface continuously and strengthen the Raman spectrum substrate as being reported in behind the polyaniline film assembling golden nanometer particle control reduction silver ions among the patent CN101566571, overcome the problem of the homogeneity difference of signal, improved sensitivity, but still there are problems such as complicated process of preparation, cost height to a certain extent.Reported among the patent CN101566571 and had the periodically flower-shaped silver-colored nanometer island structure surface-enhanced Raman of hexagonal substrate, although higher surface-enhanced Raman effects is arranged, structurally ordered adjustable, repeatability is also good, but need prepare the porous alumina formwork of different scale in advance.Recently, (the J. Appl. Phys. of national literature in Meng seminar of Inst., of Solid Physics, Chinese Academy of Sciences, 2010,107,044315) also reported based on the rapid detection of Yin Nami " dentrite " SERS effect tetrachloro biphenyl, and detectability can be very low, yet the preparation process of its silver nanometer tree branches crystalline substance need be used the HF solution of higher concentration, and this has limited its large-scale application.External people such as Maboudian are by dense HF solution-treated aluminium paper surface, with AgF as precursor, the reduction of 24h lucifuge obtains three-dimensional silver-colored dendrite, and utilize its substrate to detect 2, compounds such as 2 '-two sulphur, two pyridines, though show higher SERS signal, preparation cycle use long and high density HF solution has limited its range of application (J. Am. Chem. Soc. 2010 to a certain extent, 132,1476).In addition, utilize the reductibility of metal, controlled reduction silver ions on sheet surface, active metal and obtain three-dimensional silver-colored pine-tree structure, (Langmuir 2008 as Sn; 24:12010), Zn (J. Phys. Chem. C 2008,112,16301), Cu (Mater. Lett., 2009,63,2306) though method is easy, has limited the use of substrate raw material to a certain extent to the requirement of metal activity.
Summary of the invention
First purpose of the present invention is to provide a kind of substrate to have the Yin Nami dendrite surface enhanced Raman scattering substrate of low, easy and simple to handle, structurally ordered controlled, the favorable repeatability of cost, substrate good stability for remedying the deficiencies in the prior art and defective.
Another object of the present invention provides the preparation method of above-mentioned silver-colored nanometer dendrite surface enhanced Raman scattering substrate.
The 3rd purpose of the present invention provides the purposes of above-mentioned silver-colored nanometer dendrite surface enhanced Raman scattering substrate.
For realizing first purpose of the present invention, technical scheme of the present invention is to be substrate with the ITO conductive glass, at substrate surface by electro-deposition method depositing silver nanometer dendrite equably.
Further setting is that other the angle with trunk of described silver-colored nanometer dendrite is 60o, the length of trunk〉5 μ m, the length 100 nm-1 μ m of other branch, the diameter＜60nm of side branch.
For realizing second purpose of the present invention, technical scheme of the present invention is may further comprise the steps: with the ITO substrate is working electrode, and Silver Nitrate is as electrolytic solution, by galvanostatic method at its surperficial controlled galvanic deposit Yin Nami dendrite.Described Silver Nitrate concentration of electrolyte is 0.005-0.5 molL
-1
Further being provided with is that the used range of current of described galvanostatic method is at 0.1-50 mA.
Further being provided with is the depositing time 10-30s of galvanic deposit.
For realizing the 3rd purpose of the present invention, technical scheme of the present invention is the organic molecule that the substrate of described silver-colored nanometer dendrite surface enhanced Raman spectroscopy is used for detecting solution, as 2,2 '-two sulphur, two pyridines, adjacent diphenyl disulfide phenol, phenyl sulfur alcohol, vinyl thiocarbamide, rhodamine 6G, the detectability of concentration can reach 1 μ molL
-1
Further being provided with is to be to the method that organic molecule in the solution detects: as the Raman detection substrate, is 1 μ molL with methyl alcohol as the solvent compound concentration with the substrate of Yin Nami dendrite surface enhanced Raman spectroscopy
-1Organic molecule solution, be 1 μ molL with 50 μ l concentration
-1The organic molecule drips of solution in this substrate, treat to do Raman detection after the methanol solvate volatilization.
The present invention also provides the substrate of a kind of silver-colored nanometer dendrite surface enhanced Raman spectroscopy, its technical scheme be with the Yin Nami dendrite on the ITO conductive glass of the described silver-colored nanometer dendrite surface enhanced Raman scattering of claim 1 substrate be transferred on paper, tinsel (as copper, nickel, aluminium, gold etc.) and the plastic sheet, obtain to have equally the Yin Nami dendrite surface enhanced Raman spectroscopy substrate of surface-enhanced Raman scattering activity.
We have at length studied the influence (seeing accompanying drawing 1) that depositing time forms silver-colored pattern among the present invention, when depositing time is 2s, the silver pattern is that (Fig. 1 a) for sphere big or small about 300nm, when being increased to 4 s and 6 s respectively along with the time, silver nano-grain the phenomenon of constantly growing up and occurred germinateing (Fig. 1 b, c).The time that silver dendrite begins to occur is in 8 s, the size of dendrite and density all smaller (Fig. 1 d).More ironically, when electrochemical deposition process further carried out along with the increase of time, between 12 s and 14 s, the deposition of silver product became extraordinary, well-bedded branched structure.Comprised a long trunk in these structures, and the branch of second level and the leaf of tri-layer (Fig. 1 c, d).According to above-mentioned result, we have proposed the possible forming process (accompanying drawing 2) of nanometer silver dendrite.In the short time, the new nuclear that forms is grown up into nano particle in substrate, along with the time increases, silver ions on every side has and accumulates on the old nuclear, cause particulate to become big, when particle become greater to certain size, no longer continue to increase but begin to germinate, follow several growth rhythms as seed, slowly grow branch and leaf.
For further proving the high SERS activity of three-dimensional silver-colored dendrite substrate, 2,2 '-two sulphur, two pyridines only need simply certain density probe molecule is dropped in the substrate as probe molecule, can detect the existence of its molecule, and pipetting concentration is 1 μ molL
-12,2 '-two sulphur, two pyridine solutions, 50 μ l drop in the three-dimensional silver-colored dendrite substrate, treat to do Raman spectrum after the solvent evaporates, observe the characteristic peak of 2,2 '-two sulphur, two pyridines significantly, as 1001 cm
-1, 1051 cm
-1, 1083 cm
-1, 1116 cm
-1, 1231 cm
-1, 1281 cm
-1, 1414 cm
-1, 1553 cm
-1, 1579 cm
-1, with the result consistent (J. Am. Chem. Soc. 2010,132,1476) of bibliographical information, and Raman signal has enhancing (Fig. 3) to a certain degree.Wherein Fig. 3 A and Fig. 3 a are the corresponding datas that this experiment obtains, and Fig. 3 B and Fig. 3 b are silver-colored dendrite and the Raman signals that obtains with the method that is published in (J. Am. Chem. Soc. 2010,132,1476) respectively.In addition, we also to have done be the SERS experiment of probe molecule with the ethylene thiourea.Ethylene thiourea is the degraded product of most fruit organic bactericides, therefore develops a kind of convenience, and sensitive lower concentration detection method is significant.At present, can provide very feasible means to detect ethylene thiourea with our the silver-colored dendrite of preparation.Fig. 4 is the SERS spectrogram of ethylene thiourea molecule, and wherein highest peak is at 493.5 cm
-1The position, corresponding to the C-S stretching vibration.SERS experimental results show that the ethylene thiourea molecule lumps together by the Ag-S bond on the surface of silver-colored dendrite, appears at 1145 cm respectively by-pentacyclic characteristic peak that C-N-C-forms
-1, 1230 cm
-1, 1317 cm
-1, and 1425 cm
-1, this also is the basically identical of bibliographical information.
The silver-colored dendrite that the present invention deposits out can be transferred to any base material and comprise on inflexible and the flexible material.With 2,2'-two sulphur two pyridines are probe molecule equally, transfer on copper sheet, nickel sheet, silicon chip, plastic sheet and the scraps of paper and also can detect 2 being deposited on silver-colored dendrite on the ITO conductive glass, and the raman characteristic peak of 2'-two sulphur two pyridine molecules as shown in Figure 5.Based on the above results, the silver-colored dendrite nano material of this Experiment Preparation can be used as a kind of substrate of very effective surface enhanced Raman scattering.
The present invention compared with prior art, its outstanding advantage is:
1. the nanometer silver dendrite substrate of the present invention preparation, the pattern homogeneous, size is adjustable, broad dynamicrange in obtain reliable, stable, SRES signal uniformly.
2. the substrate that is deposited is business-like ITO, need not that substrate is carried out etching obtains uneven surface or prepares template in advance to strengthen its surface-enhanced raman scattering activity, the depositing operation of silver nanometer dendrite is simple, cost is low, and whole process of preparation is efficient and convenient, only needs tens second time.
3. sedimentary nanometer silver dendrite can adhere to simply and be transferred on the scraps of paper, plastic sheet or the tinsel, and range of application is wider.
Below in conjunction with specification drawings and specific embodiments the present invention is done further introduction.
Description of drawings
Fig. 1 deposition current is 5mA, and depositing time is respectively: (a) 2s, (b) 4s, (c) 6s, (d) 8s, (e) 12s and (f) during 14s, at the SEM of ITO surface deposition gained sample figure.AgNO
3Concentration be 20 mM;
Fig. 2 silver dendrite forming process synoptic diagram;
Fig. 3 silver dendrite detects the Raman spectrogram (laser excitation wavelength is 632.8 nm, and be 10s integral time) of 2,2 '-two sulphur, two pyridines at the bottom of as the SERS active group;
Fig. 4 silver dendrite detects the Raman spectrogram (laser excitation wavelength is that 632.8 nm and integral time are 10 s) of ethylene thiourea molecule at the bottom of as the SERS active group;
Transfer to as (A) copper (B) nickel, (C) silicon, (D) plastics, (E) Raman spectrogram during the paper surface behind Fig. 5 silver dendrite surface adsorption 2,2 '-two sulphur two pyridine molecules.Built-in: various substrate optical photographs.
Embodiment
Below by embodiment the present invention is carried out concrete description; only be used for the present invention is further specified; can not be interpreted as the qualification to protection domain of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the content of foregoing invention.
In the electrolyzer of 10ml, add 8ml AgNO
3(0.02 molL
-1) solution is ionogen, inserts small pieces ITO in electrolyzer, as working electrode, the significant part that immerses electrolytic solution is 1 cm * 0.5 cm, with the Pt silk as reference electrode and counter electrode.Open working current, and be adjusted to 5 mA, Yin Nami dendrite is in the ITO surface growth, and close current behind the 14s is used water wash ITO substrate, dries just to obtain at the bottom of the SERS active group.
The above-mentioned surface that obtains is had at the bottom of the active group of SERS effect as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are 1 μ molL as solvent with its compound concentration with methyl alcohol as probe molecule
-1Solution is measured 50 μ l with microsyringe and is dropped in this substrate, treats to do Raman detection (JY-T64000 Raman spectrometer, excitation wavelength are 632.8 nm) after the solvent evaporates, observes the characteristic peak (Fig. 3 A) of 2,2 '-two sulphur, two pyridines significantly.
Embodiment 2
In the electrolyzer of 10ml, add 8ml AgNO
3(0.02 molL
-1) solution is ionogen, inserts small pieces ITO in electrolyzer, as working electrode, the significant part that immerses electrolytic solution is 1 cm * 0.5 cm, with the Pt silk as reference electrode and counter electrode.Open working current, and be adjusted to 5 mA, Yin Nami dendrite is in the ITO surface growth, and close current behind the 10s is used water wash ITO substrate, dries just to obtain at the bottom of the SERS active group.
The above-mentioned surface that obtains is had at the bottom of the active group of SERS effect as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are as probe molecule, do Raman detection by the method among the embodiment 1, observe 2 significantly, the characteristic peak of 2 '-two sulphur, two pyridines, its Raman signal intensity is near embodiment 1.
Embodiment 3
In the electrolyzer of 10ml, add 8ml AgNO
3(0.02 molL
-1) solution is ionogen, inserts small pieces ITO in electrolyzer, as working electrode, the significant part that immerses electrolytic solution is 1 cm * 0.5 cm, with the Pt silk as reference electrode and counter electrode.Open working current, and be adjusted to 5 mA, Yin Nami dendrite is in the ITO surface growth, and close current behind the 30s is used water wash ITO substrate, dries just to obtain at the bottom of the SERS active group.
The above-mentioned surface that obtains is had at the bottom of the active group of SERS effect as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are as probe molecule, do Raman detection by the method among the embodiment 1, observe 2 significantly, the characteristic peak of 2 '-two sulphur, two pyridines, its Raman signal intensity is suitable with embodiment 1.
Embodiment 4
In the electrolyzer of 10ml, add 8ml AgNO
3(0.02 molL
-1) solution is ionogen, inserts small pieces ITO in electrolyzer, as working electrode, the significant part that immerses electrolytic solution is 1 cm * 0.5 cm, with the Pt silk as reference electrode and counter electrode.Open working current, and be adjusted to 50 mA, Yin Nami dendrite is in the ITO surface growth, and close current behind the 10s is used water wash ITO substrate, dries just to obtain at the bottom of the SERS active group.
The above-mentioned surface that obtains is had at the bottom of the active group of SERS effect as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are as probe molecule, do Raman detection by the method among the embodiment 1, observe 2 significantly, the characteristic peak of 2 '-two sulphur, two pyridines, its Raman signal intensity is suitable with embodiment 1.
Embodiment 5
In the electrolyzer of 10ml, add 8ml AgNO
3(0.02 molL
-1) solution is ionogen, inserts small pieces ITO in electrolyzer, as working electrode, the significant part that immerses electrolytic solution is 1 cm * 0.5 cm, with the Pt silk as reference electrode and counter electrode.Open working current, and be adjusted to 0.1 mA, Yin Nami dendrite is in the ITO surface growth, and close current behind the 30s is used water wash ITO substrate, dries just to obtain at the bottom of the SERS active group.
The above-mentioned surface that obtains is had at the bottom of the active group of SERS effect as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are as probe molecule, do Raman detection by the method among the embodiment 1, observe 2 significantly, the characteristic peak of 2 '-two sulphur, two pyridines, its Raman signal intensity is near embodiment 1.
Embodiment 6
In the electrolyzer of 10ml, add 8ml AgNO
3(0.005 molL
-1) solution is ionogen, inserts small pieces ITO in electrolyzer, as working electrode, the significant part that immerses electrolytic solution is 1 cm * 0.5 cm, with the Pt silk as reference electrode and counter electrode.Open working current, and be adjusted to 5 mA, Yin Nami dendrite is in the ITO surface growth, and close current behind the 30s is used water wash ITO substrate, dries just to obtain at the bottom of the SERS active group.
The above-mentioned surface that obtains is had at the bottom of the active group of SERS effect as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are as probe molecule, do Raman detection by the method among the embodiment 1, observe 2 significantly, the characteristic peak of 2 '-two sulphur, two pyridines, but its Raman signal intensity be embodiment 1 half.
Embodiment 7
In the electrolyzer of 10ml, add 8ml AgNO
3(0.5 molL
-1) solution is ionogen, inserts small pieces ITO in electrolyzer, as working electrode, the significant part that immerses electrolytic solution is 1 cm * 0.5 cm, with the Pt silk as reference electrode and counter electrode.Open working current, and be adjusted to 5 mA, Yin Nami dendrite is in the ITO surface growth, and close current behind the 10s is used water wash ITO substrate, dries just to obtain at the bottom of the SERS active group.
The above-mentioned surface that obtains is had at the bottom of the active group of SERS effect as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are as probe molecule, do Raman detection by the method among the embodiment 1, observe 2 significantly, the characteristic peak of 2 '-two sulphur, two pyridines, its Raman signal intensity is better than embodiment 1 slightly.
Embodiment 8
According to the method for embodiment 1 at the bottom of the Yin Nami dendrite active group of growing on the ITO substrate as the Raman detection substrate, as probe molecule, be 1 μ molL as solvent with its compound concentration with the vinyl thiocarbamide with methyl alcohol
-1Solution is measured 50 μ l with microsyringe and is dropped in this substrate, treats to do Raman detection (JY-T64000 Raman spectrometer, excitation wavelength are 632.8 nm) after the solvent evaporates, observes the characteristic peak (Fig. 4) of vinyl thiocarbamide significantly.
Embodiment 9
On the ITO substrate, obtain Yin Nami dendrite according to embodiment 1,, be transferred on the Cu sheet through simply adhering to, at the bottom of the active group as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are 1 μ molL as solvent with its compound concentration with methyl alcohol as probe molecule
-1Solution is measured 50 μ l with microsyringe and is dropped in this substrate, treats to do Raman detection (JY-T64000 Raman spectrometer, excitation wavelength are 632.8 nm) after the solvent evaporates, observes the characteristic peak (Fig. 5 A) of 2,2 '-two sulphur, two pyridines significantly.
Embodiment 10
On the ITO substrate, obtain Yin Nami dendrite according to embodiment 1,, be transferred on the Ni sheet through simply adhering to, at the bottom of the active group as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are 1 μ molL as solvent with its compound concentration with methyl alcohol as probe molecule
-1Solution is measured 50 μ l with microsyringe and is dropped in this substrate, treats to do Raman detection (JY-T64000 Raman spectrometer, excitation wavelength are 632.8 nm) after the solvent evaporates, observes the characteristic peak (Fig. 5 B) of 2,2 '-two sulphur, two pyridines significantly.
Embodiment 11
On the ITO substrate, obtain Yin Nami dendrite according to embodiment 1,, be transferred on the Si sheet through simply adhering to, at the bottom of the active group as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are 1 μ molL as solvent with its compound concentration with methyl alcohol as probe molecule
-1Solution is measured 50 μ l with microsyringe and is dropped in this substrate, treats to do Raman detection (JY-T64000 Raman spectrometer, excitation wavelength are 632.8 nm) after the solvent evaporates, observes the characteristic peak (Fig. 5 C) of 2,2 '-two sulphur, two pyridines significantly.
Embodiment 12
On the ITO substrate, obtain Yin Nami dendrite according to embodiment 1,, be transferred on the plastic sheet through simply adhering to, at the bottom of the active group as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are 1 μ molL as solvent with its compound concentration with methyl alcohol as probe molecule
-1Solution is measured 50 μ l with microsyringe and is dropped in this substrate, treats to do Raman detection (JY-T64000 Raman spectrometer, excitation wavelength are 632.8 nm) after the solvent evaporates, observes the characteristic peak (Fig. 5 D) of 2,2 '-two sulphur, two pyridines significantly.
Embodiment 13
On the ITO substrate, obtain Yin Nami dendrite according to embodiment 1,, be transferred on the scraps of paper through simply adhering to, at the bottom of the active group as the Raman detection substrate, with 2,2 '-two sulphur, two pyridines are 1 μ molL as solvent with its compound concentration with methyl alcohol as probe molecule
-1Solution is measured 50 μ l with microsyringe and is dropped in this substrate, treats to do Raman detection (JY-T64000 Raman spectrometer, excitation wavelength are 632.8 nm) after the solvent evaporates, observes the characteristic peak of 2,2 '-two sulphur, two pyridines significantly.(Fig. 5 E).
Claims (9)
1. silver-colored nanometer dendrite surface enhanced Raman scattering substrate is characterized in that: with the ITO conductive glass is substrate, passes through electro-deposition method depositing silver nanometer dendrite equably at substrate surface.
2. a kind of silver-colored nanometer dendrite surface enhanced Raman scattering according to claim 1 substrate, it is characterized in that: the other branch of described silver-colored nanometer dendrite is 60o with the angle of trunk, the length of trunk〉5 μ m, the length 100 nm-1 μ m of other branch, the diameter＜60nm of other branch.
3. the preparation method of a silver-colored nanometer dendrite surface enhanced Raman scattering as claimed in claim 1 substrate, it is characterized in that may further comprise the steps: with the ITO substrate is working electrode, Silver Nitrate is as electrolytic solution, by galvanostatic method at its surperficial controlled galvanic deposit Yin Nami dendrite.
4. the preparation method of silver-colored nanometer dendrite surface enhanced Raman spectroscopy according to claim 3 substrate is characterized in that: the Silver Nitrate concentration of electrolyte is 0.005-0.5 molL
-1
5. the preparation method of silver-colored nanometer dendrite surface enhanced Raman spectroscopy according to claim 3 substrate is characterized in that: the used range of current of described galvanostatic method is at 0.1-50 mA.
6. the preparation method of silver-colored nanometer dendrite surface enhanced Raman spectroscopy according to claim 3 substrate is characterized in that: the depositing time 10-30s of galvanic deposit.
7. the purposes of a silver-colored nanometer dendrite surface enhanced Raman spectroscopy as claimed in claim 1 substrate, it is characterized in that: the organic molecule that the substrate of described silver-colored nanometer dendrite surface enhanced Raman spectroscopy is used for detecting solution, as 2,2 '-two sulphur, two pyridines, adjacent diphenyl disulfide phenol, phenyl sulfur alcohol, vinyl thiocarbamide, rhodamine 6G, the detectability of concentration can reach 1 μ molL
-1
8. the purposes of silver-colored nanometer dendrite surface enhanced Raman spectroscopy according to claim 7 substrate, it is characterized in that: the method that organic molecule in the solution is detected is: as the Raman detection substrate, is 1 μ molL with methyl alcohol as the solvent compound concentration with the substrate of Yin Nami dendrite surface enhanced Raman spectroscopy
-1Organic molecule solution, be 1 μ molL with 50 μ l concentration
-1The organic molecule drips of solution in this substrate, treat to do Raman detection after the methanol solvate volatilization.
9. silver-colored nanometer dendrite surface enhanced Raman spectroscopy substrate, it is characterized in that: with the Yin Nami dendrite on the ITO conductive glass of the described silver-colored nanometer dendrite surface enhanced Raman scattering of claim 1 substrate be transferred on paper, tinsel (as copper, nickel, aluminium, gold etc.) and the plastic sheet, obtain to have equally the Yin Nami dendrite surface enhanced Raman spectroscopy substrate of surface-enhanced Raman scattering activity.
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