Preparation method of surface-enhanced Raman scattering optical fiber probe

Abstract

The invention discloses a preparation method of a surface-enhanced Raman scattering optical fiber probe. The preparation method comprises the following steps of preparing a gold seed solution and a potassium carbonate stock solution, preparing an optical fiber probe, carrying out silylation treatment on the surface of the obtained optical fiber probe to obtain a silylated optical fiber probe, putting the obtained silylated optical fiber probe into a gold seed solution, putting into a refrigerator for incubation, and then washing with deionized water to remove free gold nanoparticles on the surface of the optical fiber, so as to obtain an incubated optical fiber probe, and putting the incubated optical fiber probe into a potassium carbonate stock solution, adding a reducing agent, carrying out further in-situ growth on the gold nanoparticles modified on the end surface of the optical fiber to enable the gold nanoparticles to epitaxially grow, and washing the grown optical fiber probe with deionized water to obtain the surface-enhanced Raman scattering optical fiber probe. The method is simple to operate, low in cost and controllable in process; the prepared optical fiber probe is high in detection sensitivity, stable in signal, rich in hot spots and capable of detecting low-concentration residual substances.

Description

technical field [0001] The invention belongs to the fields of optical fiber sensing, nondestructive testing and food safety, and in particular relates to a preparation method of a surface-enhanced Raman scattering optical fiber probe. Background technique [0002] Surface-enhanced Raman scattering (Surface Enhanced Raman Scattering, SERS) spectroscopy is a widely used non-contact non-destructive testing technology, which has high detection sensitivity, short acquisition time, and can identify molecular structure information. Features such as low sensitivity and elimination of fluorescence interference. In 1973, Fleischmann et al. first observed that the Raman signal of pyridine molecules adsorbed on the surface of rough silver electrodes was enhanced, and then VanDuyne reported in 1977 that the Raman signals of pyridine molecules adsorbed on the surface of rough silver electrodes could be obtained by 10 6 enhanced. With the development of nanotechnology, various types of S...

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Problems solved by technology

The above method is expensive, the instrument is expensive, and uncontrollable factors limit the application of optical fiber SERS probes and affect the detection sensitivity of Raman signals.

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