A method for increasing the enhancement factor of surface-enhanced infrared absorption spectrum
A technology of infrared absorption spectroscopy and surface enhancement, which is applied in the field of electrochemical detection and can solve problems such as not getting ideal results.
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Embodiment 1
[0044] Preparation of gold nano-island membranes. 0.03M NaAuCl 4 solution, 0.3MNa 2 SO 4 , 0.1MNa 2 S 2 o 3 , 0.1MNH 4 The Cl mixed solution and the HF solution with a volume fraction of 3% were mixed sequentially at a volume ratio of 1:1:1, and quickly and evenly dropped on the surface of the silicon crystal heated to 70°C in a water bath, and deposited for 60s. Then, the silicon crystal deposited with the gold film was installed on the surface-enhanced infrared spectroscopy reaction cell.
[0045] Add 0.5 mL of ethanol to the reaction cell as a background spectrum. Then add 0.5mL of 2mM p-mercaptoaniline (PATP) ethanol solution to collect the sample spectrum. Each spectrum is superimposed by 512 scans. After monitoring for 20 minutes, the intensity of the infrared absorption spectrum remains basically unchanged, indicating that the adsorption of PATP on the surface of the gold film reaches Saturation, the obtained curve is as follows figure 2 Shown in solid line (a...
Embodiment 2
[0048] According to the method provided in Example 1, the first layer is gold nano-island film, the second layer is D-penicillamine, and the third layer is a sandwich structure of gold nanorods, and the enhancement factor reaches 500 times.
Embodiment 3
[0050] According to the method provided in Example 1, the enhancement factor is expanded to 400 times with the first layer being a gold nano-island membrane, the second layer being PATP, and the third layer being a gold nanoparticle-supported macroporous carbon sandwich structure.
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