Light-stream control system based on gold-nanoparticle modified carbon nanotube array surface enhanced Raman scattering

Abstract

The invention relates to a light-stream control system based on gold-nanoparticle modified carbon nanotube array surface enhanced Raman scattering and used for molecule detection. According to the system, a carbon nanotube array is used as a nanometal structure carrier, and gold nanoparticles are deposited on the carbon nanotube array carrier, thus a substrate with the three-dimensional surface enhanced Raman scattering activity is formed, wherein the substrate serves as the detection zone of a microchannle in the system; a laser source is introduced into the substrate through an optical fiber and scatters light on the substrate; the scattering light is educed on a spectrometer through an optical fiber to test a spectrum; and a pressure regulating device ensures the smooth flowing of a molecule under test in the microchannle. The substrate with the three-dimensional surface enhanced Raman scattering activity is simple in manufacturing process and low in cost and is free from toxin and pollution. The carbon nanotube array has a large surface area, thus the gold nanoparticle filling effect is improved effectively, the Raman scattering cross section is increased, and the strength of a Raman scattering signal is enhanced. By introducing in the laser through the optical fiber and collecting the Raman scattering light, the traditional micrographic focusing and aligning is omitted. The system is small in volume and low in cost and facilitates the online molecule detection.

Description

technical field [0001] The invention belongs to the field of nano-photonics and optofluidics, and specifically relates to surface-enhanced Raman scattering spectroscopy technology. Background technique [0002] With the development of human society, there is an increasing demand for the detection of various trace chemical biomolecules, including human health diseases, food contamination, environmental toxins, drugs, and explosive molecular detection for national security such as military defense. [0003] In these detection fields, Raman scattering spectrum reflects the vibration, rotation or electronic state energy changes of molecules. According to the change of photon frequency, the chemical bonds or groups contained in the molecules can be judged, so as to identify substances and analyze the properties of substances. Follow and apply. However, Raman scattering has a small scattering area and a weak signal, making it difficult to detect trace molecules. Surface enhanced...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of the SERS detection system, which are bulky, expensive, and not conducive to online detection, and propose a surface-enhanced Raman scattering optofluidic system based on gold nanoparticles modified carbon nanotube arrays

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