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 the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of unstable detection signals, complicated equipment, and small size of silver nanoparticles, and achieve a simple and fast preparation method, prevent The effect of interparticle aggregation and uniformity of silver nanoparticles

Inactive Publication Date: 2011-06-22
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0004] In order to deposit metallic silver nanoparticles on the surface of silicon nanowires, it has been reported to apply vacuum thermal evaporation method and ion sputtering method (Linyou Cao, Bora Garipcan, Eric M. Gallo, Stephen S. Nonenmann, Bahra-m Nabet, and Jonathan E .Spanier, Nano Lett, 2008, 8, 601 and C.P Li, X.H.Sun, N.B.Wong, C.S.Lee, S.T.Lee, B.K.Teo, J.Phys.Chem.B 2002, 106, 6980), but this is based on surface physics The preparation method of deposition, the equipment is relatively complicated, the particle distribution is uneven, and the particles are easy to fall off the surface with time, which leads to unstable detection signals
There are also literature reports on the application of chemical redox method to deposit metal particles (M.L.Zhang, C.Q.Yi, X.Fan, K.Q.Peng, N.B.Wong, M.S.Yang, R.Q.Zhang, and S.T, Lee, Appl.Phys.Lett, 2008, 92, 043116), the SERS detection substrate prepared by this method is relatively stable due to the chemical combination between metal particles and silicon nanowires, but the size of the prepared silver nanoparticles is too small, only in the range of 4-25nm, which cannot be used as a super Conditions for Sensitive Detection

Method used

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  • Preparation method of silicon nanowires with controlled surface-modified silver particles as single-molecule SERS (surface enhanced Raman scattering) detection substrate
  • Preparation method of silicon nanowires with controlled surface-modified silver particles as single-molecule SERS (surface enhanced Raman scattering) detection substrate
  • Preparation method of silicon nanowires with controlled surface-modified silver particles as single-molecule SERS (surface enhanced Raman scattering) detection substrate

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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

The invention discloses a method for loading silver particles on the surface of silicon nanowires. The method comprises the following steps: dispersing the silicon nanowires without a surface oxide layer in a cetyl-trimethyl ammonium bromide (CTAB) aqueous solution to obtain a dispersion solution of the silicon nanowires; adding a silver nitrate solution to the dispersion solution of the silicon nanowires while stirring, and reacting at room temperature; and centrifuging the obtained reaction solution after reaction, and colleting precipitate to obtain the silicon nanowires loaded with silver particles on the surface. The method is simple and rapid, and the adopted equipment is cheap. By utilizing the method, the silicon nanowires can be prepared in quantity, and topographical dispersion density of the silver particles deposited on the surface of the silicon nanowires can be regulated and controlled by changing the concentrations of the dispersion solution and the silver nitrate solution, thus meeting different needs.

Description

technical field [0001] The invention relates to a method for mass-preparing silicon nanowires with controllable surface modification of silver particles as a single-molecule SERS detection substrate. Background technique [0002] The application of silicon nanowires loaded with metal nanoparticles in nanocatalysis, solar cells, nanophotoelectric devices, and surface enhanced Raman scattering (SERS) detection has attracted widespread attention from the scientific and technological community. [0003] The surface-enhanced Raman effect means that when some molecules are adsorbed on the surface of some rough metals, such as gold, silver or copper, their Raman line intensity will be greatly enhanced. At present, this technology has been developed to be able to Detection is performed at the single molecule level. Among them, silver nanoparticles are most commonly used due to their easy preparation and outstanding reinforcement effect. According to theoretical calculations, when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00B82B1/00G01N21/65
Inventor 张晓宏韩雪梅王辉欧雪梅李述汤
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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