Silver nanodendrite surface enhanced Raman scattering (SERS) substrate, and preparation method and application thereof
A surface-enhanced Raman and silver nanotechnology, applied in Raman scattering, nanotechnology, material excitation analysis, etc., can solve the problem of high-concentration HF solution limiting the application range, metal activity limiting the use of substrate raw materials, and limiting large-scale applications and other problems, to achieve the effect of enhancing surface Raman scattering activity, fast and convenient preparation process, and adjustable size
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Embodiment 1
[0030] Add 8ml AgNO to a 10ml electrolytic cell 3 (0.02 mol·L -1 ) solution as the electrolyte, a small piece of ITO is inserted into the electrolytic cell as the working electrode, the effective part immersed in the electrolyte is 1 cm×0.5 cm, and the Pt wire is used as the reference electrode and the counter electrode. Turn on the working current and adjust it to 5 mA, silver nanodendrites grow on the surface of ITO, turn off the current after 14s, rinse the ITO substrate with water, and dry to obtain the SERS active substrate.
[0031] The above-mentioned active substrate with SERS effect on the surface was used as the Raman detection substrate, 2, 2’-dithiobipyridine was used as the probe molecule, and methanol was used as the solvent to prepare it at a concentration of 1 μmol L -1 solution, use a micro-syringe to measure 50 μl and drop it on the substrate, and do Raman detection after the solvent evaporates (JY-T64000 Raman spectrometer, excitation wavelength is 632.8 nm...
Embodiment 2
[0033] Add 8ml AgNO to a 10ml electrolytic cell 3 (0.02 mol·L -1 ) solution as the electrolyte, a small piece of ITO is inserted into the electrolytic cell as the working electrode, the effective part immersed in the electrolyte is 1 cm×0.5 cm, and the Pt wire is used as the reference electrode and the counter electrode. Turn on the working current and adjust it to 5 mA, silver nanodendrites grow on the surface of ITO, turn off the current after 10s, wash the ITO substrate with water, and dry to obtain the SERS active substrate.
[0034] The active substrate with the SERS effect obtained above was used as the Raman detection substrate, and 2,2'-dithiobipyridine was used as the probe molecule, and the Raman detection was performed according to the method in Example 1, and it was clearly observed that 2, The characteristic peak of 2'-dithiodipyridine, its Raman signal intensity is close to that of Example 1.
Embodiment 3
[0036] Add 8ml AgNO to a 10ml electrolytic cell 3 (0.02 mol·L -1 ) solution as the electrolyte, a small piece of ITO is inserted into the electrolytic cell as the working electrode, the effective part immersed in the electrolyte is 1 cm×0.5 cm, and the Pt wire is used as the reference electrode and the counter electrode. Turn on the working current and adjust it to 5 mA. Silver nanodendrites grow on the surface of ITO. After 30s, turn off the current, rinse the ITO substrate with water, and dry it to obtain the SERS active substrate.
[0037] The active substrate with the SERS effect obtained above was used as the Raman detection substrate, and 2,2'-dithiobipyridine was used as the probe molecule, and the Raman detection was performed according to the method in Example 1, and it was clearly observed that 2, The characteristic peak of 2'-dithiodipyridine, its Raman signal intensity is equivalent to that of Example 1.
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