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Light irradiation preparation method and use of ultra-sensitive surface enhanced Raman scattering active base

A surface-enhanced Raman and active substrate technology, applied in Raman scattering, nanotechnology, material excitation analysis, etc., can solve problems such as time-consuming and labor-intensive, high testing cost, and complex testing schemes

Inactive Publication Date: 2011-09-14
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0034] To sum up, these analysis schemes can meet the basic requirements of analysis, and have certain selectivity, reliability, accuracy and repeatability, but these test schemes are extremely complicated, require multiple instruments to be used together, and the test cost is high , the test efficiency is low, time-consuming and labor-intensive, and it is impossible to achieve real-time on-site detection

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  • Light irradiation preparation method and use of ultra-sensitive surface enhanced Raman scattering active base
  • Light irradiation preparation method and use of ultra-sensitive surface enhanced Raman scattering active base
  • Light irradiation preparation method and use of ultra-sensitive surface enhanced Raman scattering active base

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Embodiment

[0070] A method for preparing an ultrasensitive core-shell or alloy SERS substrate by light irradiation, the operation steps of the method are:

[0071] (1) Adsorption of silver ions on DNA templates

[0072]First take 20 μL of λ-DNA solution with a concentration of 300ng / μL and 80 μL of AgNO with a concentration of 1mM 3 The solutions were mixed, and placed in dark conditions at room temperature for 3 hours to interact with each other, in order to make the Ag + Sufficiently adsorbed to the DNA template.

[0073] (2) The first photochemical reaction

[0074] The above mixed solution was exposed to sunlight for the first photochemical reaction. As time goes by, the solution gradually turns yellow from the original colorless, and finally turns gray (indicating that silver has been generated at this time). Sunlight exposure time varies from a few minutes to tens of minutes.

[0075] (3) The second photochemical reaction

[0076] Then NaAuCl at a concentration of 1 mM 4 Sol...

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Abstract

The invention discloses a light irradiation preparation method and a use of an ultra-sensitive surface enhanced Raman scattering active base. The light irradiation preparation method comprises the following steps of: firstly, depositing silver nano particles on a surface of a DNA, then, taking the silver as a nucleation site to assemble the gold on the silver; and then, depositing small gold particles on a nano structure of silver-DNA by the sunlight again. The silver-nucleus gold-shell or silver-gold alloy nano DNA network structure is a good surface enhanced Raman scattering (SERS) active base obviously effective in TNT detection. The lowest detection limit can reach the prior lowest detection level, and enhancement factors can reach the order of magnitude of 1011-1012. The Light irradiation preparation method and the use of the ultra-sensitive surface enhanced Raman scattering active base provide a quick and accurate detection method for detecting explosives, such as TNT and the like.

Description

[0001] technical field [0002] The invention relates to the technical field of new materials, and is designed to the synthesis and detection application of nanomaterials, in particular to a method for preparing an ultrasensitive core-shell or alloy nanomaterial SERS substrate for detecting TNT. Background technique [0003] Explosives endanger social stability and national security. According to United Nations estimates, more than 100 million landmines are now planted in 60 countries around the world, posing a greater threat to civilians and seriously polluting the local environment. Inspecting explosives at airports, docks, stations, etc. is a arduous and costly task. Due to the particularity of the location, these places usually have the characteristics of many people, fast crowd flow, complex background, and many personal belongings. , so the detection of contraband has become one of the priorities of these locations. The intensification of terrorist activities has forc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B22F9/24B22F1/02B82Y40/00
Inventor 杨良保李民强刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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