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Super-hydrophobic nano-silver raman-enhanced substrate material and preparation method thereof

A substrate material and nano-silver technology, which is applied in Raman scattering, material excitation analysis, metal material coating process, etc. Enhanced effect, not easy to deteriorate, simple effect

Inactive Publication Date: 2014-09-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the limit of detection is below 10 -10 The ultrasensitive Raman-enhanced substrates of M have been reported by many researchers, but the preparation process of these substrates is complicated, the required equipment is expensive, and they cannot be reused, so they are still not suitable for practical applications.
It is of course the goal of researchers to prepare periodic nano-silver arrays, but obtaining a Raman-enhanced substrate that is easy to prepare, has a long shelf life, and can be used many times is of great significance for production practice

Method used

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  • Super-hydrophobic nano-silver raman-enhanced substrate material and preparation method thereof
  • Super-hydrophobic nano-silver raman-enhanced substrate material and preparation method thereof
  • Super-hydrophobic nano-silver raman-enhanced substrate material and preparation method thereof

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Effect test

Embodiment 1

[0035] A copper sheet is selected as the metal substrate, and its surface is subjected to electrochemical degreasing and 20% sulfuric acid pickling treatment. Put the treated copper sheet in the chemical deposition solution for chemical deposition. The composition and concentration of the chemical deposition solution are: silver nitrate 0.08mol / L, ammonium citrate 0.08mol / L, boric acid 0mol / L, hypophosphorous acid Sodium 0mol / L, additive 0g, adjust pH to 7.5 with ammonia water, the temperature of chemical deposition is 80 ℃, and chemical deposition time is 10min, the rough nano-silver surface obtained is as follows figure 1 As shown, the particle size range of the rough nano-silver particles is between 100-500nm, and the distance between silver particles is 10-30nm, which can generate strong plasmon resonance. After storage for 1-2 months, the contact angle of water droplets on the surface is 150°. However, due to the poor uniformity of the particle size, the surface Raman enh...

Embodiment 2

[0037] A copper sheet is selected as the metal substrate, and its surface is subjected to electrochemical degreasing and 20% sulfuric acid pickling treatment. Put the treated copper sheet in the chemical deposition solution for chemical deposition. The composition and concentration of the chemical deposition solution are: silver nitrate 0.08mol / L, malic acid 0.08mol / L, boric acid 4mol / L, sodium hypophosphite 0mol / L, adjust the pH to 8 with ammonia water, the temperature of chemical deposition is 20°C, and the chemical deposition time is 5min. The rough nano-silver surface obtained is as follows figure 2 As shown, the rough nano-silver has a slender sheet structure with a length of 0.5-1.0 μm, a thickness of 0.01-0.03 μm, and a silver particle spacing of 100-300 nm, which can generate strong plasmon resonance and can be stored for 1-2 days. After one month, the contact angle of water droplets on the surface is 154°. However, due to the large distance between particles and poor...

Embodiment 3

[0039]A copper sheet is selected as the metal substrate, and its surface is subjected to electrochemical degreasing and 20% sulfuric acid pickling treatment. Put the treated copper sheet in the chemical deposition solution for chemical deposition. The composition and concentration of the chemical deposition solution are: silver nitrate 0.08mol / L, ammonium citrate 0.08mol / L, boric acid 4mol / L, hypophosphorous acid Sodium 0.2mol / L, polyvinyl alcohol 3g / L, adjust the pH to 8 with ammonia water, the temperature of chemical deposition is 50 ℃, and the chemical deposition time is 30min, the obtained rough nano-silver surface is as follows: image 3 As shown, the rough nano-silver is in an elongated sheet-like structure with a length of 1-1.5 μm, a thickness of 0.01-0.02 μm, and a silver particle spacing of 50-200 nm, which can generate strong plasmon resonance and can be stored for 1-2 After one month, the contact angle of water droplets on the surface is 156°, the distance between ...

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Abstract

The invention discloses a super-hydrophobic nano-silver raman-enhanced substrate material and a preparation method thereof. The preparation method comprises the following steps: performing surface de-oiling and acid washing on a base material in sequence; performing chemical deposition in chemical silver-plating deposition liquid at 20-80 DEG C for 2-30 minutes; and storing a nano-silver substrate obtained by the deposition for 1-2 months to obtain the super-hydrophobic nano-silver raman-enhanced substrate material. The method is a one-step chemical deposition process and is simple and feasible, and the super-hydrophobic surface with high contact angle hysteresis can be obtained without any surface modification; the prepared substrate has an ultrasensitive raman-enhanced effect, rhodamine 6G is taken as a probe molecule, and the detection limit is reduced to 10-12mol / L; meanwhile, the substrate is very good in surface structure stability and excellent in performances of acid resistance, alkaline resistance, organic solvent resistance, low temperature resistance, high temperature resistance and the like, and can meet the actual application needs.

Description

technical field [0001] The invention relates to a super-hydrophobic nano silver structure Raman enhanced base material and a preparation method thereof. Background technique [0002] The surface Raman enhancement effect is the behavior of adsorbing chemical substances on the rough metal surface to greatly enhance the Raman spectrum intensity of the detected substance. Raman spectroscopy can reflect the structural information of molecules very well, and the discovery of Raman-enhanced spectroscopy greatly reduces the concentration of detected substances, thus expanding the application range of Raman spectroscopy. Raman-enhanced spectroscopy has important applications in biosensing, single-molecule monitoring, and the environment. Silver is an excellent Raman-enhancing substrate material, and the nanometer-level silver particle spacing can produce a strong Raman-enhancing effect. Since Fleishmann et al. first discovered the Raman-enhancing effect on the rough silver surface i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/44G01N21/65
Inventor 杭弢吴蕴雯李明
Owner SHANGHAI JIAO TONG UNIV
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