Precious metal nanocone SERS substrate for detecting novel coronavirus and preparation method
A coronavirus and nanocone technology, which is applied in the field of laser Raman spectroscopy and virus detection, can solve the problems of cumbersome and time-consuming capture methods, low capture efficiency, and weak Raman signal intensity, and achieve high capture efficiency and detection accuracy , Improve capture efficiency and avoid false negative effects
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[0031] Example 1
[0032] S1. Cover the surface of the substrate with a single layer of polystyrene microspheres by means of self-assembly. The diameter of the polystyrene microspheres is 100 nm. The diameters of the polystyrene microspheres in the same batch are highly consistent and the particle size is standard. The deviation is less than 5%;
[0033] S2, smoothly bend the periphery of the substrate toward the center of the surface of the polystyrene microsphere by 20 degrees, and then place the bent substrate in the reactive ion etching device;
[0034] S3. Using sulfur hexafluoride as the reactive gas, under the conditions of gas flow rate of 30 sccm, cavity pressure of 15 Pa, and etching power of 150 watts, reactive ion etching is performed on the substrate surface where the polystyrene microspheres are located, to the surface of the substrate. Nanocones are formed and polystyrene microspheres are completely removed;
[0035] S4. Keep the bent state of the substrate, d...
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