A kind of preparation method of cubic gold nano-sers probe for tnt detection

Abstract

A method for preparing a cubic nano-gold SERS probe for TNT detection, including the preparation of seed crystal gold, further growth, functional modification and self-assembly of silicon wafers. The preparation process is as follows: firstly, the preparation and further growth of seed crystal gold, secondly, the growth environment is strictly controlled through the seed growth mechanism to make it grow into a cubic structure, and then, after polishing 1×1cm 2 The mercapto group is modified on the silicon wafer, so that the monolayer of gold particles self-assembles on the surface of the silicon wafer. Finally, the electron-rich amino group is modified on the surface of the silicon wafer, and further interacts with the three electron-deficient nitro groups in the TNT target molecule through electrostatic interaction. , realize the selective recognition of TNT, use the local plasmon resonance field on the surface of gold nanoparticles to amplify and enhance the conventional Raman signal of TNT molecules, and realize the trace detection of TNT with a detection limit of 10 ‑ 9 mol L ‑1 . The invention has simple preparation, convenient operation, low cost, good selectivity and high 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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