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Surface plasmon crystal transducer and preparation method thereof

A surface plasmon and sensor technology, applied in the field of plasmon crystal sensor and its preparation, can solve the problem of low sensitivity, achieve high sensitivity, good comprehensive index, and reduce the effect

Inactive Publication Date: 2009-10-07
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the traditional prism structure, the use of metal nanostructures simplifies the measurement mode, and the size is small and easy to integrate, but the sensitivity obtained is relatively low

Method used

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  • Surface plasmon crystal transducer and preparation method thereof
  • Surface plasmon crystal transducer and preparation method thereof
  • Surface plasmon crystal transducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: In this example, monodisperse silica microspheres with a diameter of 1580 nanometers were selected. First, two-dimensional hexagonal close-packed colloidal crystals are assembled on a quartz substrate (see authorized patents ZL 03 1 31989.0 and ZL 2004 1 0041939.9). Secondly, the argon ion sputtering coating method is used to directly deposit a layer of gold film on the surface of the microsphere template, and the deposition time is controlled so that the thickness of the apex of the gold hemispherical shell is about 50 nanometers (see patent application 200610039478.0). The silicon dioxide sacrificial template was then removed by hydrofluoric acid vapor etching to obtain a surface plasmon crystal sensor composed of interconnected gold nano-hollow hemispherical shells. Finally, the surface plasmon sensor located on the flat quartz substrate is immersed in the solution to be measured to measure the optical transmission spectrum.

Embodiment 2

[0029] Embodiment 2: In this example, monodisperse silica microspheres with a diameter of 1000 nanometers were selected. First, two-dimensional hexagonal close-packed colloidal crystals are self-assembled on a glass substrate. Secondly, the argon ion sputtering coating method is used to directly deposit a layer of platinum film on the surface of the microsphere template, and the deposition time is controlled so that the thickness of the apex of the platinum hemispherical shell is about 100 nanometers. The silicon dioxide sacrificial template was then removed by hydrofluoric acid vapor etching to obtain a surface plasmon crystal sensor composed of interconnected platinum nano-hollow hemispherical shells. Finally, the surface plasmon crystal sensor located on the flat glass substrate is immersed in the solution to be measured to measure the optical transmission spectrum.

Embodiment 3

[0030] Embodiment 3: In this example, monodisperse silica microspheres with a diameter of 490 nanometers were selected. First, two-dimensional hexagonal close-packed colloidal crystals are self-assembled on a glass substrate. Secondly, a magnetron sputtering method is used to directly deposit a layer of aluminum film on the surface of the microsphere template, and the deposition time is controlled so that the thickness of the apex of the aluminum hemispherical shell is about 50 nanometers. Then, the silicon dioxide sacrificial template was removed by vapor etching of hydrofluoric acid, and a surface plasmon crystal sensor composed of interconnected aluminum nano-hollow hemispherical shells was obtained. Finally, the surface plasmon crystal sensor located on the flat glass substrate is immersed in the solution to be measured to measure the optical transmission spectrum.

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Abstract

The invention discloses a surface plasmon crystal transducer and a manufacturing method thereof. The transducer comprises a quasi-three-dimensional metal hemispherical shell membrane with periodic fluctuation surface; the metal hemispherical shell membrane is formed by metal nano hollow hemispherical shells and forms two-dimensional hexagonal close piling arrangement; the adjacent hemispherical shells are connected with each other; and microscopic holes are arranged among any three adjacent hemispherical shells. The manufacturing method of the transducer comprises the following steps of: adopting colloidal crystal obtained by micron or submicron medium microspheres through self-assembly technology as a template; utilizing a physical or chemical deposition method to deposit metal nanoparticles on the surface of the microspheres of the template till the deposition amount of the metal leads the nanoparticles to form a continuous metal hemispherical shell membrane; and utilizing a physical or chemical method to remove the colloidal crystal template so as to obtain the surface plasmon crystal transducer formed by the metal nano hollow hemispherical shells. The invention has the advantages of simple manufacturing process, low cost, good stability, high sensitivity, repeatability and simple operation.

Description

technical field [0001] The invention relates to a sensor and a preparation method thereof, in particular to a surface plasmon crystal sensor and a preparation method thereof. Background technique [0002] Chemical and biological sensors are an advanced detection method and monitoring method in the field of analytical chemistry and biology. It can realize rapid and trace detection and analysis of substances at the molecular level. The principle is generally chemical biosorption, electrochemical reaction and molecular interaction. Phenomena such as action cause small changes in semaphore and convert them into measurable signals. [0003] The concept of surface plasmons is that when the incident light wave hits the interface between the metal and the medium, it will cause the collective oscillation of the free electron density of the metal. The electromagnetic field is localized in a small range on the metal surface and the field is enhanced, forming a surface Plasmons (surfac...

Claims

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Application Information

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IPC IPC(8): G01N21/59G01N21/49G01N21/31G01N21/65B82B1/00B82B3/00
Inventor 王振林李媛媛潘剑詹鹏
Owner NANJING UNIV
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