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Application of hybridization perovskite meta-surface to Raman spectrum enhancement

A Raman spectroscopy and perovskite technology is applied in the application field of hybrid perovskite supersurface in Raman spectroscopy enhancement, which can solve the problems of high cost and difficulty in large-scale preparation, and achieve low detection cost and low price. , the preparation method is simple

Inactive Publication Date: 2015-06-17
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing metasurfaces for the enhancement of molecular Raman spectroscopy all use precious metal materials such as gold and silver, which are extremely costly and require electron beam lithography for nanofabrication, making it difficult to prepare on a large scale. Therefore, exploring new metasurfaces that can enhance Raman spectroscopy The metasurface of Mann spectroscopy is a very meaningful and challenging work
[0005] In recent years, hybrid perovskite has been successfully applied to solar cells. As described by Liu M et al. in the scientific journal Nature (2013, 501, 395-398), hybrid perovskite solar cells have high photoelectric conversion efficiency and low preparation cost. Obvious advantages, there is no report on the use of hybrid perovskite for Raman spectroscopy enhancement

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Embodiment 1

[0039] The application of hybrid perovskite metasurface in Raman spectroscopy enhancement, in which the hybrid perovskite metasurface is lead iodide (PbI 2 ) and methyl iodide (CH 3 NH 3 1) lead methyl iodide (CH) prepared from 3 NH 3 PB 3 ) hybrid perovskite film, its X-ray diffraction pattern (XRD) is as figure 1 As shown in A, its scanning electron microscope picture is as follows figure 2 a.

[0040] In the specific implementation process, lead methyl iodide (CH 3 NH 3 PB 3 ) The preparation of the hybrid perovskite metasurface comprises the following steps:

[0041] (1) Cleaning of the substrate

[0042] Get the silicon dioxide substrate, adopt the mixed solvent of acetone and dehydrated alcohol (volume ratio 1: 3) and deionized water to carry out ultrasonic cleaning respectively to this silicon dioxide substrate, cleaning time is 15 minutes, after cleaning, use nitrogen gas Blow dry the silica substrate.

[0043] (2) Synthesis of methyl iodide ammonium

[0...

Embodiment 2

[0055] The application of hybrid perovskite metasurface in Raman spectroscopy enhancement, in which the hybrid perovskite metasurface is lead bromide (PbBr 2 ) and ethyl ammonium bromide (C 2 h 5 NH 3 Br) lead ethyl bromide (C) prepared from 2 h 5 NH 3 PbBr 3 ) hybrid perovskite film, its X-ray diffraction pattern (XRD) is as figure 1 As shown in B, its scanning electron microscope is shown as figure 2 b.

[0056] In the specific implementation process, lead ethyl ammonium bromide (C 2 h 5 NH 3 PbBr 3 ) The preparation of the hybrid perovskite metasurface comprises the following steps:

[0057] (1) Cleaning of gold-plated silica substrate

[0058] Get the silicon dioxide substrate plated with gold on the surface, adopt the mixed solvent of acetone and dehydrated alcohol (volume ratio 1: 3) and deionized water to carry out ultrasonic cleaning respectively to this silicon dioxide substrate, cleaning time is 15 minutes, after cleaning The silica substrate was then ...

Embodiment 3

[0071] The application of hybrid perovskite metasurface in Raman spectroscopy enhancement, in which the hybrid perovskite metasurface is tin chloride (SnCl 2 ) and methylammonium chloride (CH 3 NH 3 Cl) prepared from methyl ammonium tin chloride (CH 3 NH 3 SnCl 3 ) hybrid perovskite film, its X-ray diffraction pattern (XRD) is as figure 1 As shown in C, its scanning electron microscope is shown as figure 2 c.

[0072] In the specific implementation process, lead ethyl ammonium bromide (C 2 h 5 NH 3 PbBr 3 ) The preparation of the hybrid perovskite metasurface comprises the following steps:

[0073] (1) Cleaning of titanium dioxide-coated glass substrates

[0074] Get the glass substrate coated with titanium dioxide on the surface, adopt the mixed solvent of acetone and absolute ethanol (volume ratio 1: 3) and deionized water to carry out ultrasonic cleaning to the glass substrate coated with titanium dioxide respectively, the cleaning time is 15 minutes, after clea...

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Abstract

The invention discloses application of a hybridization perovskite meta-surface to Raman spectrum enhancement. The hybridization perovskite meta-surface is a hybridization perovskite film manufactured by metal halide and organic ammonium halide, metal in the metal halide is any one of Ge<2+>, Sn<2+> or Pb<2+>, and the organic ammonium in the organic ammonium halide is organic single ammonium ions or organic diammonium ions. The hybridization perovskite meta-surface can remarkably enhance the Raman spectrum of the surface molecules; besides, the hybridization perovskite meta-surface is simple to manufacture, and the raw materials are low in cost.

Description

technical field [0001] The invention belongs to the field of material application, and in particular relates to the application of a hybrid perovskite metasurface in Raman spectrum enhancement. Background technique [0002] Raman spectrum is a kind of scattering spectrum. Raman spectroscopy is based on the Raman scattering effect discovered by Indian scientist C.V. Raman (Raman), that is, under the action of excitation light, the sample molecules cause inelastic scattering different from the frequency of excitation light due to molecular vibration. This frequency change It reflects the vibration energy level of the molecule, that is, the fingerprint information of the molecular structure. Raman spectroscopy is widely used in the structural study of organic molecules. [0003] However, the low sensitivity of early Raman spectroscopy made it difficult to apply. In 1997, people first used metal nanoparticles to enhance Raman scattering by 10 14 -10 15 times, single-molecule...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 韦晓兰
Owner CHONGQING TECH & BUSINESS UNIV
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