Preparation method for cubic nanogold SERS (Surface Enhanced Raman Scattering) probe used for TNT (trinitrotoluene) detection

A cubic, nano-gold technology, applied in the field of materials science, can solve the problems of high explosion hazard, soil and water environment pollution, damage, etc.

Active Publication Date: 2019-10-15
HEFEI UNIV
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Problems solved by technology

[0002] Trinitrotoluene (TNT) is the most widely used military explosive. It is widely used in civil and mining blasting industries. TNT has a strong explosion hazard and poses an important threat to environmental safety. It is often left in nature during production, manufacturing and transportation. In the environment, due to its biological persistence, toxicity and mutagenicity, it pollutes the soil and water environment. After people directly or indirectly drink this TNT-contaminated water, it will cause irreversible harm to life and health, except In addition to causing extensive damage, harmful substances derived from explosives will accumulate in the environment for a long time during use, handling, storage and dumping. It has been confirmed that TNT can cause anemia, liver dysfu...

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  • Preparation method for cubic nanogold SERS (Surface Enhanced Raman Scattering) probe used for TNT (trinitrotoluene) detection
  • Preparation method for cubic nanogold SERS (Surface Enhanced Raman Scattering) probe used for TNT (trinitrotoluene) detection
  • Preparation method for cubic nanogold SERS (Surface Enhanced Raman Scattering) probe used for TNT (trinitrotoluene) detection

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preparation example Construction

[0044] A method for preparing a cubic gold nanometer SERS probe for TNT detection, characterized in that: the SERS probe is self-assembled on a silicon wafer with a surface-modified mercapto group through cubic gold nanometer particles, and the surface of the silicon wafer is rich in electrons The amino group interacts with the three electron-deficient nitro groups in the TNT molecule through electrostatic interaction, so that the TNT molecule adheres to the surface of the cubic gold nanoparticle. The Mann signal is amplified and enhanced to realize the detection of TNT. The above-mentioned SERS probe preparation process includes the following three steps:

[0045] The first step is the preparation of seed crystal gold sol: first, measure 1 ~ 15mL of HAuCl 4 Add the solution into a 250mL three-necked flask filled with 50mL deionized water, then place it in a constant temperature oil bath with a reflux device, perform magnetic stirring at a speed of 400 ~ 600rpm, and heat the t...

specific Embodiment

[0049] Firstly, prepare gold sol and cubic gold nanoparticles, and secondly, prepare the polished 1×1cm 2 The surface of the silicon wafer is firstly decorated with mercapto groups, then the cubic nano-gold monolayer is self-assembled on the surface of the silicon wafer, and finally, the surface of the silicon wafer is modified with amino groups, and the electron-rich amino groups and the three electron-deficient nitro groups in the TNT molecule pass through Electrostatic interaction makes TNT molecules adhere to the surface of cubic gold nanoparticles, and the local surface plasmon resonance field of cubic gold nanoparticles is used to amplify and enhance the conventional Raman signal of TNT molecules to realize the detection of TNT. The SERS probe preparation process includes the following three steps:

[0050] The first step is the preparation of seed crystal gold sol: first, measure 8 mL of HAuCl 4 The solution was added into a 250mL three-necked flask containing 50mL of ...

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Abstract

The invention discloses a preparation method for a cubic nanogold SERS probe used for TNT detection. The preparation method comprises seed crystal gold preparation, further growth and the functional modification and the self assembling of a silicon wafer. The preparation process of the preparation method comprises the following steps that: firstly, preparing seed crystal gold, and enabling the seed crystal gold to further grow; secondly, through a seed growth mechanism, strictly controlling the growth environment of the seed crystal gold to enable the seed crystal gold to grow into a cubic structure; thirdly, modifying sulfydryl on a polished 1*1cm<2> silicon wafer to enable a gold particle monolayer to be assembled to the surface of the silicon wafer on the own; and finally, modifying thesurface of the silicon wafer with electron-rich amino, realizing the selective recognition of the TNT further through a static electricity mutual function with three electron deficiency nitryls in aTNT target molecule, and utilizing a local area plasma resonance field on the surface of the nanogold to amplify and enhance the conventional Raman signal of the TNT molecule so as to realize the trace detection of the TNT, wherein a detection limit is 10<-9>mol.L<-1>. The preparation method has the advantages of being simple in preparation, convenient in operation, low in cost, good in selectivity and high in sensitivity.

Description

technical field [0001] The invention relates to the field of material science, in particular to a method for preparing a cubic nano-gold SERS probe for TNT detection. Background technique [0002] Trinitrotoluene (TNT) is the most widely used military explosive. It is widely used in civil and mining blasting industries. TNT has a strong explosion hazard and poses an important threat to environmental safety. It is often left in nature during production, manufacturing and transportation. In the environment, due to its biological persistence, toxicity and mutagenicity, it pollutes the soil and water environment. After people directly or indirectly drink this TNT-contaminated water, it will cause irreversible harm to life and health, except In addition to causing extensive damage, harmful substances derived from explosives will accumulate in the environment for a long time during use, handling, storage and dumping. It has been confirmed that TNT can cause anemia, liver dysfuncti...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y15/00B82Y40/00
CPCB82Y15/00B82Y40/00G01N21/658
Inventor 高大明张立东陈倩云朱德春陈红张宇刚张慧张凌云刘安求王晓晨
Owner HEFEI UNIV
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