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Fabrication method of surface-enhanced Raman probe based on secondary enhancement

A surface-enhanced Raman and fabrication method technology, applied in the field of sensing, can solve problems such as limited field enhancement, low enhancement factor, and low detection sensitivity, and achieve high-sensitivity Raman detection, increased Raman enhancement factor, and strong localization Effects of Electromagnetic Fields

Inactive Publication Date: 2013-04-17
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the enhancement factor of this arrangement is low, which cannot be compared with the previous arrangement, resulting in lower detection sensitivity
This is because the probe structure only utilizes a local effect of the metal structure, and the field enhancement obtained by a local area is limited

Method used

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  • Fabrication method of surface-enhanced Raman probe based on secondary enhancement
  • Fabrication method of surface-enhanced Raman probe based on secondary enhancement
  • Fabrication method of surface-enhanced Raman probe based on secondary enhancement

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. But the following examples are only limited to explain the present invention, and the protection scope of the present invention should include the entire content of the claims, and those skilled in the art can realize the entire contents of the claims of the present invention through the following examples.

[0024] like figure 2 Showing the surface-enhanced Raman probe structure of the present invention, image 3 It is a cross-sectional view of a unit of the surface-enhanced Raman probe structure, wherein 11 is a substrate, 12 is a metal film, and 13 is a metal particle; In the point structure, the metal particles 13 are located at the tip of the quadrangular pyramid micro-point structure.

[0025] A method for making a highly sensitive surface-enhanced Raman probe based on secondary enhancement, according to figure 1 The flow shown, the i...

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Abstract

The invention relates to a fabrication method of a surface-enhanced Raman probe based on secondary enhancement. The surface-enhanced Raman probe consists of a pyramid-like micro-tip structure coated with a metal film and metal nanoparticles on the tip. The micro-tip structure excites and propagates surface plasma waves along the metal film surface, and the surface plasma waves gather at the tip to form a primary local enhancement field, which serves as an exciting field to excite the metal nanoparticles to generate a further local to form a secondary local enhancement field stronger than the primary local enhancement field, so that a higher enhancement factor can be obtained to enable the probe to realize high-sensitivity surface-enhanced Raman detection. The surface-enhanced Raman probe fabricated by the method provided by the invention solves the problems of the conventional Raman detector, such as low enhancement factor, and can realize high-sensitivity surface-enhanced Raman detection.

Description

technical field [0001] The present invention relates to a sensing technology, in particular to a novel surface-enhanced Raman probe with high sensitivity. The probe utilizes a combination of metal microtips and metal particles to form a secondary local area to enhance Raman scattering intensity , to obtain high sensitivity characteristics. Background technique [0002] Raman spectroscopy has fingerprint characteristics. Its spectral characteristics reflect the molecular structure of substances, and its intensity reflects the content of substances. It has a very wide range of applications in biological analysis, environmental monitoring, explosives safety monitoring, substance identification, and food safety testing. The signal of traditional laser Raman spectroscopy is very weak, and the Raman signal can be enhanced by several orders of magnitude through surface enhancement of metal micro-nano structures, that is, surface-enhanced Raman spectroscopy. Metallic structures wit...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 邓启凌夏良平尹韶云李志炜杜春雷
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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