Use method of precious metal nanocone SERS substrate for detecting novel coronavirus
A coronavirus and nanocone technology, applied in the field of laser Raman spectroscopy and virus detection, can solve the problems of low capture efficiency and weak Raman signal intensity
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Embodiment 1
[0027] S1. By the method of self-assembly, the surface of the substrate is covered with a single layer of polystyrene microspheres. The diameter of the polystyrene microspheres is 100nm. The diameter of the same batch of polystyrene microspheres is highly consistent and the particle size is standard. The deviation is less than 5%;
[0028] S2. Place the substrate covered with polystyrene microspheres in a reactive ion etching device, use sulfur hexafluoride as the reaction gas, and polymerize under the conditions of a gas flow rate of 30 sccm, a chamber pressure of 15 Pa, and an etching power of 150 watts. Reactive ion etching is carried out on the substrate surface where the styrene microspheres are located, until nanocones are formed on the surface of the substrate and the polystyrene microspheres are completely removed;
[0029] S3. Depositing noble metal nanoparticles on the surface of the substrate where the nanocone is located by magnetron sputtering to form a noble meta...
Embodiment 2
[0031] S1. By the method of self-assembly, the surface of the substrate is covered with a single layer of polystyrene microspheres. The diameter of the polystyrene microspheres is 100nm. The diameter of the same batch of polystyrene microspheres is highly consistent and the particle size is standard. The deviation is less than 5%;
[0032] S2. Smoothly bend the two opposite sides of the substrate toward the center of the surface where the polystyrene microspheres are located for 20 degrees, and then place the curved substrate in a reactive ion etching device;
[0033] S3, using sulfur hexafluoride as the reaction gas, under the conditions of gas flow rate 30 sccm, cavity pressure 15 Pa, and etching power 150 watts, reactive ion etching is carried out 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;
[0034] S4, keeping the curved state of the subst...
Embodiment 3
[0036] 10 micrograms of polystyrene colloidal microspheres with a diameter of 100nm are blown out at a gas flow rate of 100 sccm, and the noble metal nanocone SERS substrate sample 1 prepared in Example 1 is placed flat to capture and collect, and then rinsed with running water for 10 seconds and then carried out Raman Spectral characterization, such as image 3 As shown in the curve 1;
[0037] 10 micrograms of polystyrene colloidal microspheres with a diameter of 100nm are blown out at a gas flow rate of 100 sccm, using the noble metal nanocone SERS substrate sample 1 made in Example 1, and the two opposite ends of the sample 1 substrate are facing away from the nanocone array The surface where it is located is smoothly bent at 20 degrees, and kept in a curved state for capture and collection. The curved substrate is laid flat, and then the two opposite ends of the substrate are bent 20 degrees toward the surface where the nanocone array is located, and rinsed with running w...
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