Terahertz metamaterial absorber and quantitative detection method for trace IAA in chili extracting solution based on terahertz metamaterial absorber

A metamaterial and terahertz technology, applied in the analysis of materials, material analysis through optical means, instruments, etc., to achieve good tolerance and multi-band perfect absorption characteristics

Inactive Publication Date: 2021-02-23
SHANDONG IND TECH RES INST OF ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, there is no study on the quantitative detection

Method used

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  • Terahertz metamaterial absorber and quantitative detection method for trace IAA in chili extracting solution based on terahertz metamaterial absorber
  • Terahertz metamaterial absorber and quantitative detection method for trace IAA in chili extracting solution based on terahertz metamaterial absorber
  • Terahertz metamaterial absorber and quantitative detection method for trace IAA in chili extracting solution based on terahertz metamaterial absorber

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Experimental program
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Embodiment 1

[0034] Example 1: Fabrication of a metamaterial absorber

[0035] (1) On a 500 μm thick silicon substrate, 300 nm thick silicon dioxide (SiO2) was deposited on the silicon substrate by chemical vapor deposition. 2 )layer;

[0036] (2) In silicon dioxide (SiO 2 ) layer adopts the sputtering deposition method to deposit one deck as the 30nm thick titanium (Ti) layer of adhesion layer and the gold (Au) layer that one deck thickness is 200mm, as metal reflection layer;

[0037] (3) A polyimide dielectric layer with a thickness of 8 μm was prepared by spin coating on the metal reflective layer, and soft curing was performed in a nitrogen-containing vacuum oven;

[0038] (4) On the polyimide dielectric layer, a 30nm thick titanium (Ti) layer and a 200mm thick Au layer were deposited as an adhesion layer by sputtering deposition, and then standard positive photolithography was used , metal evaporation and ion beam etching technology, the metal layer on the top of the layer compose...

Embodiment 2

[0042] Quantitative detection method of trace IAA in pepper extract based on terahertz metamaterials, including:

[0043] Step 1. Liquid sample preparation of trace pesticides in capsicum extract.

[0044] Prepare pepper (purchased in Hangzhou Organic Vegetable Market) extract: divide pepper into 18 parts, take 10g pepper samples from each part, crush them and put them in a 50mL centrifuge tube, add 10mL petroleum ether, 5g sodium chloride, 250mg sodium chloride successively. Magnesium sulfate water, 1 ceramic homogenate, shake well, vortex and mix for 1 min, and then centrifuge at 8000r / min for 3 min to obtain a colored supernatant. Take 2 mL and add 150 mg magnesium sulfate, 50 mg PSA, 10 mg graphitized carbon black and 50 mg C18 into a 15 mL centrifuge tube, vortex and mix for 1 min, then centrifuge at 8000 r / min for 3 min, take 1 mL of supernatant, and put the supernatant into a syringe After passing through a 0.22 μm organic filter membrane, it can be prepared within 10 ...

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Abstract

The invention discloses a terahertz metamaterial absorber and a quantitative detection method for trace IAA in a chili extracting solution based on the terahertz metamaterial absorber. The terahertz metamaterial absorber comprises a metal pattern layer, a dielectric layer and a metal reflecting layer, wherein the metal pattern layer is formed by periodically arranging metamaterial structure unitsin the following structure. The quantitative detection method of the trace IAA in the chili extracting solution comprises the following steps: (1) adding the IAA into the chili extracting solution which does not contain the IAA, and preparing a series of standard liquid samples; (2) dropping a standard liquid sample on the surface of the terahertz metamaterial absorber, and performing spectral measurement in a TM polarization and reflection mode to obtain a terahertz absorption spectrum; (3) establishing a standard curve of the amplitude and/or frequency position of an absorption peak of the terahertz metamaterial absorber at 1.575 THz and the IAA concentration; and (4) measuring the concentration of IAA in the pepper extracting solution to be measured by utilizing the standard curve. According to the method disclosed by the invention, the lowest concentration detected by the IAA can reach 10ng/L.

Description

technical field [0001] The invention relates to the field of plant detection, more specifically, it relates to a terahertz metamaterial absorber and a quantitative sensing detection method for trace IAA in pepper extract based on the terahertz metamaterial absorber. Background technique [0002] The following background art is provided to help the reader understand the present invention and is not to be admitted as prior art. [0003] Pesticide material Indole-3-acetic acid (Indole-3-Acetic Acid, IAA) is a hormone that promotes plant growth and belongs to a kind of plant growth regulator. In agriculture, high-concentration IAA can be used as a herbicide. The trace detection of highly toxic and harmful pesticide residues is of great significance to ensure the safety of agricultural products. Trace is defined as the amount less than one millionth of the content in the sample to be tested, and its detection difficulty coefficient is relatively high. [0004] Traditional detect...

Claims

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Application Information

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IPC IPC(8): H01Q17/00H01Q15/00G02B5/00G01N21/3586G01N21/3577
CPCH01Q17/008H01Q15/0086G02B5/003G01N21/3586G01N21/3577
Inventor 聂鹏程瞿芳芳蔺磊张慧陈卓怡
Owner SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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