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Graphene plasmonic liquid sensor

A plasmon, graphene technology, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as detection of unused liquid samples

Inactive Publication Date: 2018-09-28
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, graphene plasmons have not been used in the detection of liquid samples at present, and the main challenge is that there is no suitable sensor that can combine infrared light-transmitting liquid chambers with graphene plasmonic devices.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] figure 1 Shown is a cross-sectional view of the graphene plasmonic liquid sensor of the first embodiment of the present invention. According to the first embodiment of the present invention, the graphene plasmonic liquid sensor 100 in this embodiment sequentially includes Substrate 101, dielectric layer 102, graphene layer 103, microcavity 108, and cover plate 109,

[0044] Wherein the two ends of the graphene layer 103 are respectively provided with a metal electrode 104 and a metal electrode 105, wherein the metal electrode 104 and the metal electrode 105 are selected from chromium, titanium, iron, aluminum, copper, gold, silver, platinum.

[0045] The two ends of the microcavity 108 are respectively provided with a patterned coating 106 forming a microcavity channel and a patterned coating 107 forming a microcavity channel; the thickness of the microcavity 108 is in the range of 10-200 nm.

[0046] Wherein the cover plate 109 is respectively provided with a sample i...

Embodiment 2

[0062] figure 2 A schematic structural view (sectional view) of the graphene plasmonic liquid sensor according to the second embodiment of the present invention is shown.

[0063] Wherein the graphene plasmonic liquid sensor 200 in this embodiment includes a substrate 201, a dielectric layer 202, a graphene layer 203, a microcavity 206, and a cover plate 207 in sequence from bottom to top,

[0064] Wherein the two ends of the graphene layer 203 are respectively provided with a metal electrode 204 and a metal electrode 205;

[0065] Wherein the cover plate 207 is respectively provided with a sample inlet channel 208 and a sample outlet channel 209 communicated with the microcavity 206;

[0066] The substrate 201 is connected to the metal electrode 204 or the metal electrode 205 through a gate voltage source 210 .

Embodiment 3

[0068] image 3 A schematic structural diagram (sectional view) of the graphene plasmonic liquid sensor according to the third embodiment of the present invention is shown.

[0069] Wherein the graphene plasmonic liquid sensor 300 in this embodiment includes a substrate 3201, a dielectric layer 302, a graphene layer 303, an infrared window 309, a microcavity 308, and a cover plate 310 and a cover plate 311 from bottom to top,

[0070] Wherein the two ends of the graphene layer 303 are respectively provided with a metal electrode 304 and a metal electrode 305;

[0071] Wherein the sample inlet channel 312 and the sample outlet channel 313 communicated with the microcavity 308 are respectively set on the cover plate 310 and the cover plate 311;

[0072] Wherein the substrate 301 is connected to the metal electrode 304 or the metal electrode 305 through a gate voltage source 314;

[0073] Wherein the infrared window 309 includes a SiN window, which can transmit infrared light. ...

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Abstract

The invention discloses a graphene plasmonic liquid sensor. The sensor comprises a cover plate and graphene plasmonic components, wherein the graphene plasmonic components comprise a substrate, a dielectric layer, a graphene layer and a microcavity in sequence from bottom to top, wherein a sample injection channel and a sample discharge channel communicating with the microcavity are respectively disposed in the cover plate; a liquid microcavity is above the graphene layer; and the graphene plasmon can enhance the infrared absorption of a solution to be tested or matters contained in the solution. Chemical compositions and structures are identified by the infrared characteristic absorption of materials in the obtained enhanced infrared spectrum. A plasmon wavelength is in the mid-infrared band (resonance frequency is 400 to 3000 wavenumbers); and the sensor can be reused and integrated.

Description

technical field [0001] The invention relates to the fields of infrared optical sensing and plasmon-enhanced spectroscopy, in particular to a liquid sensor integrating graphene plasmon devices and microcavities. Background technique [0002] Infrared spectroscopy can accurately reflect the information of molecular vibrations, and is an important means to identify the composition and structure of materials. Infrared spectroscopy has the advantages of no need for sample labeling, no damage to samples, high speed, high instrument penetration rate, and complete spectral library. It has been widely used in chemical composition analysis, environmental monitoring, food safety testing, explosives detection, and biomedicine. . [0003] Probing liquid samples with infrared spectroscopy is of great interest in the fields of materials, chemistry, biology, and soft matter. In-situ monitoring of liquid-phase chemical reactions is an important means to study the growth process and catalyt...

Claims

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Application Information

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IPC IPC(8): G01N21/3577
CPCG01N21/3577
Inventor 戴庆杨晓霞郭相东吴晨晨刘宁
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA