Method for enhancing Raman spectrum by using shell isolated nano particles

A nanoparticle and Raman spectroscopy technology, used in Raman scattering, material analysis by optical means, measurement devices, etc., can solve the problems of interference experiments, weak Raman signals, wrong information, etc., to achieve high detection sensitivity, improve Detection sensitivity, preparation method and the effect of simple raw materials

Active Publication Date: 2010-09-15
XIAMEN PUSHI NANO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(B. Pettinger, B. Ren, G. Picardi, R. Schuster and G. Ertl, Nanoscale probing of absorbed species by tip-enhanced Raman spectroscopy. Phys. Rev. Lett. 2004, 92, 096101.) But the TERS technique only uses a needle tip, which leads to its enhanced Raman signal is relatively weak, so so far the use of TERS is limited to some probe molecules with relatively large Raman scattering cross-section
Another limitation of TERS is that the tip of TERS is bare, so in the gas phase or solution environment, some probe molecules will be easily adsorbed on the tip of TERS, and the Raman signal generated will be much stronger than that from the substrate to be probed. on the signal, which is bound to interfere with the experiment and give wrong information

Method used

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  • Method for enhancing Raman spectrum by using shell isolated nano particles
  • Method for enhancing Raman spectrum by using shell isolated nano particles
  • Method for enhancing Raman spectrum by using shell isolated nano particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of a shell-isolated nanoparticle:

[0040] figure 1 A schematic diagram of the experimental flow for shell-isolated nanoparticles is given.

[0041] Taking thin-shell silica gold-coated core-shell nanoparticles as an example, the specific preparation method is:

[0042] Take 200ml of chloroauric acid aqueous solution with a mass fraction of 0.01%, heat it to boiling under stirring conditions, then add 1.4ml of a 1% sodium citrate aqueous solution, and keep boiling slightly for 40min, the solution gradually changes from light yellow to brownish red , make it fully reacted and then naturally cool to room temperature to obtain a gold nanoparticle sol with a diameter of about 55±10 nm. Take 30ml of gold nanoparticle sol as a seed, add 0.4ml of 1mM aminosilane aqueous solution, stir at room temperature for 15min, then add 3.2ml of 0.54% sodium silicate aqueous solution, stir for 2 minutes, then transfer to a temperature of about 98 In a water bath at ℃, react ...

Embodiment 2

[0045] SERS characterization to detect whether the shell of the shell-isolated core-shell nanoparticle is dense and pinhole-free:

[0046] Synthesized shell-isolated nanoparticles with pinholes (taking thin-shelled silica gold-coated core-shell nanoparticles as an example) and nanoparticles without pinholes were compared, centrifuged and washed twice, and the bottom concentrate was taken to disperse bright On a silicon wafer, after drying, it was placed in a 0.1M pyridine solution for Raman testing.

[0047] image 3 It is the experimental result of Example 2. exist image 3 where the abscissa is the Raman shift. image 3 The middle curve a represents the SERS spectrum of gold-coated silica nanoparticles with pinholes, and there is an obvious 1009cm -1 and 1034cm -1 The characteristic Raman peaks of pyridine on gold. Curve b represents the SERS spectrum of gold-coated silica nanoparticles without pinholes, but there is no Raman peak of pyridine adsorbed on gold. This ex...

Embodiment 3

[0049] Study on the SERS Behavior of Platinum-Hydrogen Bonding on the Surface of Single Crystal Platinum(111) Using Shell-isolated Nanoparticle Enhanced Raman Spectroscopy:

[0050] The assembled shell-isolated nanoparticles (take the thin-shell silica gold-coated core-shell nanoparticle as an example) and the platinum single crystal (111) surface without assembled particles were prepared in 0.1M NaClO 4 SERS experiments were carried out in solution at different potentials.

[0051] Figure 4 It is the experimental result of embodiment 3. exist Figure 4 Among them, curve a represents the SERS spectrum of the platinum single crystal (111) surface without the assembly of thin-shell silica gold-coated nanoparticles, and no spectral peaks in this frequency range were observed. Curve b represents the SERS spectrum on the (111) surface of platinum single crystal assembled with thin-shell silica gold-coated nanoparticles, and there is an obvious 2023cm -1 The characteristic stre...

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Abstract

The invention relates to a method for enhancing a Raman spectrum by using shell isolated nano particles, relating to the field of detection of laser Raman spectrums. The invention provides the universal method which has easy and fast preparation, low cost, strong Raman signal, good repeatability and accurate result, and is used for enhancing the Raman spectrum by using the shell isolated nano particles. The method comprises the following steps of: preparing the shell isolated nano particles with nuclear shell structures taking metal nano particles as kernels and extremely-thin shell inert materials as outer shells; uniformly scattering the shell isolated nano particles on the surface of a sample to be measured; and directly detecting the surface enhanced Raman spectrum.

Description

technical field [0001] The invention relates to the detection of laser Raman spectrum, in particular to a method for enhancing Raman spectrum by using a shell layer to isolate nanoparticles. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is an important spectroscopic technique that can identify species adsorbed on the surface of nanostructures at the molecular level, and its enhancement ability can reach 10 6 ~10 12 . However, SERS technology has not developed into an important tool in surface science and actual production practice. One of the main reasons is that it is only available on the surface of a few metals such as gold, silver, and copper (and lithium, sodium, potassium, etc.) A strong SERS effect can be produced, and the substrate surface is required to be rough, which greatly limits the application prospects of SERS technology. Therefore, the universality of substrate materials and the universality of substrate morphology have always b...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 李剑锋田中群王中林
Owner XIAMEN PUSHI NANO TECH CO LTD
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