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

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...

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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 dysfunction, and cause cancer. Therefore, the development of A highly selective, highly sensitive, trace detection method for TNT is particularly important

[0006] Although the above-mentioned SERS substrate can realize the detection of TNT, there are still some areas for improvement. Many existing technologies using nanomaterials in sensor manufacturing have difficulties in controlling material growth, particle size, or manipulation of material structure, and metal nanoparticles The shape, size, etc. of metal nanoparticles are closely related to their optical properties, such as nanospheres, nanorods, etc., due to the local charge polarization effect, they produce multiple absorption peaks in the near-infrared region, and how to control the shape, shape, and Size will be a big factor driving SERS

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