CN109837531A - Gold nano triangle piece preparation method with surface-enhanced Raman effects - Google Patents

Gold nano triangle piece preparation method with surface-enhanced Raman effects Download PDF

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CN109837531A
CN109837531A CN201810723772.6A CN201810723772A CN109837531A CN 109837531 A CN109837531 A CN 109837531A CN 201810723772 A CN201810723772 A CN 201810723772A CN 109837531 A CN109837531 A CN 109837531A
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gold nano
enhanced raman
triangle piece
piece preparation
acid solution
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CN109837531B (en
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刘晓燕
司东辉
望军
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Chongqing University of Science and Technology
Shenzhen Institute of Advanced Technology of CAS
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Chongqing University of Science and Technology
Shenzhen Institute of Advanced Technology of CAS
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Abstract

The present invention discloses a kind of gold nano triangle piece preparation method with surface-enhanced Raman effects, the following steps are included: taking lithium niobate monocrystal piece as substrate, substrate forward direction polarization is face-up, and chlorauric acid solution is added dropwise, then photochemical precipitation reaction is carried out with ultraviolet light chlorauric acid solution, using the beneficial effects of the invention are as follows provide the brand-new method of one kind come the good SERS substrate of processability, i.e. photochemical precipitation method prepares gold nano triangular plate, this method is simple to operation, experimental period the much shorter than traditional chemical compound experiment period, the time is greatly saved, and it can accurately control the size of Golden Triangle piece, and it can be used repeatedly for the lithium niobate monocrystal piece used, service life is very long, experimental cost is greatly saved.

Description

Gold nano triangle piece preparation method with surface-enhanced Raman effects
Technical field
The present invention relates to field of molecular detection, and in particular to the gold nano triangular plate with surface-enhanced Raman effects Preparation method.
Background technique
Raman scattering spectrum is referred to as the fingerprint of substance, can identify type even intermolecularization of molecule using it The vibration information of key is learned, however the intensity of Raman diffused light is very weak, only accounts for the 10 of total scattering luminous intensity-6-10-10, it is very difficult to it obtains and divides The Raman signal of son.Research is found: Surface Enhanced Raman Scattering Spectrum (SERS) i.e. by Molecular Adsorption noble metal granule such as silver, Gold or copper particle surface, or are adsorbed on the rough surface of these sheet metals, and the intensity for sample its Raman spectrum being adsorbed can mention It is high by 103-106Times.It is generally believed that more violent in coarse surface upper surface of substrate plasma vibration, rough surface can To be coupled out very strong electromagnetic field, this is very prominent for the contribution of Raman scattering enhancing.Usually preparation Raman scattering enhances substrate Method has magnetron sputtering method, chemical etching method, photoetching process etc., although these technologies have developed relative maturity, there are technique items The disadvantages of part is harsh, complicated for operation, cost is excessively high, the severe constraints application of Surface enhanced Raman scattering (SERS) substrate.
Summary of the invention
In order to solve the above technical problems, the present invention provides the gold nano triangular plate preparation side with surface-enhanced Raman effects Method.
Technical solution is as follows: a kind of gold nano triangle piece preparation method with surface-enhanced Raman effects, and key exists In the following steps are included: taking lithium niobate monocrystal piece as substrate, up by substrate forward direction polarization, and in the forward direction plane of polarization Upper dropwise addition chlorauric acid solution, then carries out photochemical precipitation reaction with ultraviolet light chlorauric acid solution, in the lithium niobate list Gold nano triangular plate is made on the positive plane of polarization of chip.By adopting the above technical scheme using lithium niobate monocrystal piece as substrate, adopt Gold nano triangular plate is prepared with light chemical deposition, this method is easy to operate, and preparation gained gold nano triangle chip size is controllable, real Period much shorter than the traditional chemical compound experiment period is tested, the time is greatly saved, only uses in the entire experiment process Chlorauric acid solution and lithium niobate monocrystal piece, and it can be used repeatedly for lithium niobate monocrystal piece, and service life is very long (if do not broken Damage can be used always), experimental cost is greatly saved in this.
Above-mentioned ultraviolet lighting angle is the vertical substrate incident, adds 10- every 5min during the ultraviolet lighting The chlorauric acid solution of 20 μ l, to maintain the concentration to solution under the uniform irradiation of dropping liquid and illumination.
It further include that photochemical precipitation rinses substrate surface with alcohol and pure water respectively after reaction, and is blown with nitrogen It is dry.It is to wash off the acid solution for being attached to substrate surface and organic matter using the purpose of this scheme, the Jenner for facilitating observation to generate The size of rice triangular plate simultaneously carries out Raman experiments.
Above-mentioned ultraviolet ray intensity is 10-40 μ W/cm2
The time of above-mentioned ultraviolet light is 5-20min.
The above-mentioned a length of 280-400nm of ultraviolet light wave.
The concentration of above-mentioned chlorauric acid solution is 10mmol/l.
The utility model has the advantages that using good come processability the beneficial effects of the invention are as follows a kind of brand-new method is provided SERS substrate, i.e. photochemical precipitation method prepare gold nano triangular plate, and this method is simple to operation, and experimental period closes than traditional chemical Much shorter is wanted at experimental period, the time is greatly saved, and can accurately control the size of gold nano triangular plate, and is used Lithium niobate monocrystal piece it can be used repeatedly, service life is very long, and experimental cost is greatly saved.
Detailed description of the invention
Fig. 1 a is the electron microscope of a sample;
Fig. 1 b is the electron microscope of b sample;
Fig. 1 c is the electron microscope of c sample;
Fig. 1 d is the electron microscope of d sample;
Fig. 1 e is the electron microscope of e sample;
Fig. 1 f is the electron microscope of f sample;
Fig. 1 g is the electron microscope of g sample;
Fig. 1 h is the electron microscope of h sample;
Fig. 2 a is the EDS distribution diagram of element of lithium niobate monocrystal on piece Au, Nb, O element;
Fig. 2 b is the EDS distribution diagram of element of lithium niobate monocrystal on piece Nb element;
Fig. 2 c is the EDS distribution diagram of element of lithium niobate monocrystal on piece Au element;
Fig. 2 d is the EDS distribution diagram of element of lithium niobate monocrystal on piece O element;
Fig. 3 is the Raman scattering enhanced spectrum figure of Au nanometers of triangular plates;
Fig. 4 is the Raman scattering enhanced spectrum figure of Au nanometers of triangular plates and Au particle.
Specific embodiment
Below with reference to test example and attached drawing, the invention will be further described.
(1) preparation method: a kind of gold nano triangle piece preparation method with surface-enhanced Raman effects, by following step It is rapid to carry out: congruent melting component ratio lithium niobate monocrystal is taken, edge cuts to obtain lithium niobate monocrystal thin slice perpendicular to crystallographic axis c-axis direction, The thin slice is polished to a thickness of 0.3mm, surface smoothness reaches optics rank, using the lithium niobate monocrystal thin slice after polishing as Substrate, upward by the substrate forward direction plane of polarization (face+Z), and on the forward direction plane of polarization be added dropwise 10mmol/l chlorauric acid solution, The chlorauric acid solution of dropwise addition is in semi-ellipsoid shape, is then carried out with the ultraviolet light vertical irradiation chlorauric acid solution of 280-400nm photochemical Deposition reaction is learned, ultraviolet source used is mercury xenon lamp (shore pine light source curing L9566-02) and with heat-insulated purple filter plate (model A916-03 can penetrate the light of 280-400nm wavelength), every the chlorine gold of 5min addition 10-20 μ l during the reaction Acid solution, to maintain first to use alcohol rinse after experiment to the concentration of chlorauric acid solution under the uniform irradiation of dropping liquid and illumination Substrate surface twice, is rinsed one minute every time, is then rinsed twice with clean water, and is rinsed one minute, is finally blown with nitrogen every time It is dry.
(2) influence of the analysis different illumination intensity, light application time to the gold nano triangle chip size of deposition.
Test example 1, influence of the different light application times to the gold nano triangular plate of deposition
It is carried out by method described in (one) preparation method, the difference is that: controlling the ultraviolet ray intensity is 40 μ W/ cm2, the control ultraviolet lighting time is respectively 5min, 10min, 15min, 20min, respectively obtains tetra- samples of a, b, c, d, is tested After under an optical microscope respectively observe tetra- samples of a, b, c, d SEM image, as a result as is shown in figs. la to ld.
Gold nano triangular plate in sample a is minimum, and side length is in 400-700nm, with the continuous extension of light application time, four Gold nano triangular plate in a sample is constantly being grown up, and when light application time is 20min, the gold nano triangular plate side length of sample d reaches To 3-4 μm, but gold nano triangular plate can't grow up without end with the extension of time, when gold nano triangular plate is grown To regular shape, the gold nano triangular plate being fully crystallized will stop growing.
Test example 2, influence of the different illumination intensity to the gold nano triangular plate of deposition
It is carried out by method described in (one) preparation method, the difference is that: controlling the ultraviolet light time is 20min, Controlling intensity of illumination is respectively 10 μ W/cm2、20μW/cm2、30μW/cm2With 40 μ W/cm2, respectively obtain tetra- samples of e, f, g, h Product observe the SEM image of tetra- samples of e, f, g, h, as a result such as Fig. 1 e-1h institute respectively under an optical microscope after the test Show.In the case where concentration determines, the ion stream in chlorauric acid solution is constant, and with the increase of light intensity, photon stream also exists Increase, the electronics that lithium niobate is inspired will increase, and the gold atom restored will be more, will be easier to combine between atom Together, the growth of gold nano triangular plate can be accelerated, and volume can constantly become larger.
It can be seen that ultraviolet light intensity and chlorauric acid solution concentration can all influence the growth of gold nano triangular plate, it is ultraviolet Illumination power decides photon stream size, and the stronger photon stream of intensity of illumination will be bigger;The concentration of chlorauric acid solution decide from Subflow size, solution concentration more macroion stream will be bigger.It is controlled by adjusting ultraviolet light intensity and chlorauric acid solution concentration The ratio of photon stream processed and ion stream, to achieve the purpose that the size for controlling gold nano triangular plate obtained by photochemical precipitation.
In lithium columbate crystal, the coplanar accumulation of oxygen octahedra, public face is vertical with oxygen octahedra polar axis, and ferroelectric crystal has Ferroelectric phase and paraelectric phase, para-electric alpha region is without spontaneous polarization, and in ferroelectric phase region, Li atom leaves the public face of oxygen octahedra along c Axis translation, and Nb atom is translated along octahedra center along c-axis.Lithium niobate structure cell is hexagonal cells, and triple rotary shafts are c-axis. Spontaneous polarization is generated inside lithium columbate crystal under ferroelectric phase and forms the built in field generated by polarization.Ultraviolet light (200~ Under 400nm) shining, the band gap of lithium niobate is 3.9eV, and electronics obtains energy jump conduction band in valence band, in built-in electric field force The Au ion moved in the polarization of lithium niobate forward direction surface, with chlorauric acid solution under effect occurs reduction reaction and restores gold ion At gold atom.The gold atom restored in the solution is according to face-centered cubic packing, since lithium niobate is hexagonal cells structure, and gold Lattice matches, that is to say, that has a common brilliant picture, thus is easy to form gold nano triangular plate on lithium niobate surface Seed.With the continuous reduction of gold atom, gold atom on the basis of face-centered cubic packing along the energy of triangular plate crystal phase most Bottom surface growth, until growing into complete gold nano triangular plate.
(3) result verification
(1) ingredient is verified
A sample Optical microscopy distribution diagram of element is taken, as a result as shown in Figure 2 a-2d.Fig. 2 a represents three kinds of members Plain Au, Nb, O distribution diagram of element, the light-colored part of Fig. 2 b represent Nb Elemental redistribution, this part is more, and representative element distribution is more, Also thus prove that the part not being blanked is lithium niobate substrate;Fig. 2 c represents the distribution of Au element, it is compared with 2a, can The nanometer triangular plate for proving deposition is Au;Fig. 2 d represents O Elemental redistribution, and the light-colored part O Elemental redistribution in the figure is higher, the portion Dividing exactly is exactly the place not covered by Au element, it proves that substrate is niobic acid lithium material with the Nb element in Fig. 2 b jointly. It is analyzed by EDS, has been well demonstrated that the nanometer triangular plate deposited in photochemical precipitation reaction is exactly to be made of Au element, has verified Photochemical precipitation reaction produces Au nanometers of triangular plates.
(2) Raman scattering is verified
Any one sample in a-h is taken, adsorbs 4NBT on sample first, then acquires Raman with the laser of 633nm Spectrum, acquisition position are as shown in Figure 3.(Fig. 3 intermediate cam shape at location A at the tip of Au nanometers of triangular plates, that is, in Fig. 3 Apex angle draw at small circle, do not deposit gold nano grain at this) do not collect and be adsorbed on 4NBT on Au nanometers of triangular plates The signal of molecule;There is an Au nano particle on Au nanometers of triangular plates simultaneously, (Fig. 3 at the B location in the point i.e. figure The intervening deposition of intermediate cam shape has at gold nano grain) Raman signal that the molecule can be collected, in this spectrum can also See the characteristic peak of DMAB molecule, that is to say, that surface plasma driving catalysis reaction has occurred, reason is that Au nanometers Both particle and Au nanometers of triangular plates can be coupled out stronger electromagnetic field under laser, this stronger electromagnetic field can be put Electronics inelastic scattering signal in macromolecular, so as to collect Raman.
Equally, Raman signal is acquired at another tip of the sample, acquisition position and result are as shown in figure 4, difference Be that the tip has an Au nano particle, can equally obtain the Raman scattering signal of molecule, and if it is Au nanometers single Piece is then it is very difficult to collect Raman signal on lithium niobate, this shows to have between Au nano particle the enhancing of electromagnetic field to imitate It answers, and is difficult that signal can be captured on lithium niobate.
In addition research also found, when acquiring Raman scattering signal between two Au nanometers of triangular plates, can equally acquire To the signal of enhancing.
Finally, it should be noted that foregoing description is only the preferred embodiment of the present invention, the ordinary skill people of this field Member under the inspiration of the present invention, without prejudice to the purpose of the present invention and the claims, can make multiple similar tables Show, such transformation is fallen within the scope of protection of the present invention.

Claims (7)

1. a kind of gold nano triangle piece preparation method with surface-enhanced Raman effects, it is characterised in that the following steps are included: It takes lithium niobate monocrystal piece as substrate, which is polarized up, and dropwise addition gold chloride is molten on the forward direction plane of polarization Then liquid carries out photochemical precipitation reaction with ultraviolet light chlorauric acid solution, in the forward direction polarization of the lithium niobate monocrystal piece Gold nano triangular plate is made on face.
2. the gold nano triangle piece preparation method according to claim 1 with surface-enhanced Raman effects, feature exist In: the ultraviolet lighting angle is the vertical substrate incident, every 5min addition 10-20 μ l's during the ultraviolet lighting Chlorauric acid solution.
3. the gold nano triangle piece preparation method according to claim 2 with surface-enhanced Raman effects, feature exist In: further include that photochemical precipitation rinses substrate surface with alcohol and pure water respectively after reaction, and with being dried with nitrogen.
4. the gold nano triangle piece preparation method according to claim 1-3 with surface-enhanced Raman effects, It is characterized by: the ultraviolet ray intensity is 10-40 μ W/cm2
5. the gold nano triangle piece preparation method according to claim 4 with surface-enhanced Raman effects, feature exist In: the time of the ultraviolet light is 5-20min.
6. the gold nano triangle piece preparation method according to claim 1 with surface-enhanced Raman effects, feature exist In: a length of 280-400nm of ultraviolet light wave.
7. the gold nano triangle piece preparation method according to claim 6 with surface-enhanced Raman effects, feature exist In: the concentration of the chlorauric acid solution is 10mmol/l.
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