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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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 scatte

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

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Example Embodiment

[0038] Example 1

[0039] Preparation of a kind of shell isolation nanoparticle:

[0040] figure 1 A schematic diagram of the experimental process of shell isolation of nanoparticles is given.

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

[0042] Take 200ml of 0.01% chloroauric acid aqueous solution, heat it to boiling under stirring, then add 1.4ml of 1% sodium citrate aqueous solution and keep it boiling for 40 minutes, the solution will gradually change from light yellow to brownish red After being completely reacted, it is naturally cooled to room temperature to obtain a gold nanoparticle sol with a diameter of about 55±10 nm. Take 30ml of gold nanoparticle sol as 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 and transfer to a temperature of about 98 After reacting for 1 h i...

Example Embodiment

[0044] Example 2

[0045] SERS characterization to detect whether the shell of the core-shell structured nanoparticles isolated by the shell is dense and without pinholes:

[0046] Synthesis of pinhole shell isolation nanoparticles (taking thin-shell silica-coated gold core-shell structure nanoparticles as an example) and non-pinhole nanoparticles were compared, centrifuged and washed twice, and the bottom concentrated liquid was taken to disperse brightly. After drying, perform Raman test in 0.1M pyridine solution.

[0047] image 3 This is the experimental result of Example 2. in image 3 In the middle, the abscissa is the Raman displacement. image 3 The middle curve a represents the SERS spectrum of pinhole silica-coated gold nanoparticles, with a clear 1009cm -1 And 1034cm -1 The characteristic Raman peaks of pyridine on gold. Curve b represents the SERS spectrum of pinhole-free silica-coated gold nanoparticles, but there is no Raman peak of pyridine adsorbed on gold. This ex...

Example Embodiment

[0048] Example 3

[0049] Study on the SERS behavior of platinum-hydrogen bonds on the surface of single crystal platinum (111) by using the shell-isolated nanoparticles enhanced Raman spectroscopy technology:

[0050] The assembled shell isolation nanoparticles (taking the thin-shell silica-coated gold core-shell nanoparticle as an example) and the platinum single crystal (111) plane without assembled particles are respectively in 0.1M NaClO 4 SERS experiments were performed under different potentials in solution.

[0051] Figure 4 This is the experimental result of Example 3. in Figure 4 In the graph, curve a represents the SERS spectrum on the (111) surface of the platinum single crystal without assembled thin-shell silica-coated gold nanoparticles, and no peaks in this frequency range are observed. Curve b represents the SERS spectrum on the (111) surface of platinum single crystals assembled with thin-shell silica-coated gold nanoparticles, and there is an obvious 2023cm -1 T...

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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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