Preparation method of silicon nanowires with controlled surface-modified silver particles as single-molecule SERS (surface enhanced Raman scattering) detection substrate
A technology of silicon nanowires and silver particles, applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of unstable detection signals, small size of silver nanoparticles, and complicated equipment, and achieve simple and fast preparation methods, silver The uniformity of nanoparticles and the effect of preventing aggregation between particles
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Examples
Embodiment 1
[0023] Example 1. Preparation of silicon nanowires with controllable surface modification of silver particles as a single-molecule SERS detection substrate
[0024] The silicon nanowires used in this example are obtained by using an existing method: using tin powder as a catalyst, and thermally evaporating SiO powder; the details are as follows: Weigh 3.0g SiO powder and 0.5g Sn powder, place them in a porcelain boat and mix them evenly. The porcelain boat is placed in the high temperature zone of the vacuum tube furnace, and the vacuum tube furnace is closed; the air is pumped until the pressure in the furnace chamber reaches 5×10 -2 After mbar, the mixed gas of argon and hydrogen is introduced until the pressure in the furnace is 350mbar, and the high temperature zone in the furnace is heated to 1360°C at a speed of 40°C / min, kept for 7-8h, and then cooled to room temperature. The diameter of the prepared silicon nanowire is about 100-500 nanometers, and the surface is cover...
Embodiment 2
[0029] Example 2. Preparation of silicon nanowires with controllable surface modification of silver particles as a single-molecule SERS detection substrate
[0030] Prepare the silicon nanowires with silver particles on the surface according to the method of Example 1, the difference is that the AgNO3 solution used in this example has a concentration of 0.2mM, observe its morphology under a transmission electron microscope, and the obtained silicon nanowires The morphology of the silver nanoparticles loaded on the surface is as follows figure 2 as shown in a. Depend on figure 2 a It can be seen that the average particle size of silver nanoparticles is about 17nm, and the distance between adjacent particles is about 30nm; the single-molecule surface-enhanced Raman spectrum of the sample is as follows figure 2 b shown by figure 2 b It can be seen that the sample does not have the ability of single molecule detection.
Embodiment 3
[0031] Example 3. Preparation of silicon nanowires with controllable surface modification of silver particles as a single-molecule SERS detection substrate
[0032] Prepare the silicon nanowires with silver particles on the surface according to the method of Example 1, the difference is that the AgNO3 solution used in this example has a concentration of 1.5mM, observe its morphology under a transmission electron microscope, and the obtained silicon nanowires The morphology of the silver nanoparticles loaded on the surface is as follows image 3 as shown in a. Depend on image 3 a It can be seen that the average size of silver nanoparticles is 30.55nm, and the distance between adjacent particles is about 3nm; this sample is used to detect single molecule surface enhanced spectroscopy such as image 3 b shown by image 3 b It can be seen that the single molecule detection signal of this sample is better.
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Abstract
Description
Claims
Application Information
- IPC
- G01N21/65; B82B3/00
- Inventors
- 张晓宏; 韩雪梅