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Self-energized expiration sensor and preparation method thereof

A sensor and self-powered technology, applied in the field of sensors, can solve problems such as limited applications, and achieve the effect of improving detection sensitivity

Active Publication Date: 2019-08-16
BEIJING INST OF NANOENERGY & NANOSYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the electrochemical workstation to provide an external electric field, and in most cases the substrate needs to be soaked in the electrolyte solution, which greatly limits its application.

Method used

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  • Self-energized expiration sensor and preparation method thereof
  • Self-energized expiration sensor and preparation method thereof
  • Self-energized expiration sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] refer to image 3 As shown, the preparation method of the self-powered exhalation sensor of the present disclosure includes:

[0059] Step S302: growing a diaphragm with piezoelectricity and dielectric properties; and growing a second electrode and a first electrode on the upper and lower sides of the diaphragm respectively to prepare an energy supply unit;

[0060] In this embodiment, the material of the diaphragm 10 is polyvinylidene fluoride or its copolymer added with reduced graphene oxide and barium titanate particles. The materials of the first electrode 20 and the second electrode 30 are conductive materials, including: metal materials, such as: gold, silver, platinum, copper, aluminum, titanium, etc.; conductive oxides, such as indium tin oxide; organic conductors, such as: Polypyrrole, polyaniline, polythiophene, etc.

[0061] In this example, first, polyvinylidene fluoride or its copolymers, polyethyleneimine-dispersed reduced graphene oxide, and barium tit...

example 1

[0077] In this example, copper foil is used as the material of the first electrode, gold is used as the material of the second electrode, polyvinylidene fluoride + reduced graphene oxide is used as the diaphragm material, and a composite film of gold nanoparticles supported by reduced graphene oxide is used as the material. Surface-enhanced Raman spectroscopy substrate with polydimethylsiloxane as encapsulation layer.

[0078] In this example, the self-powered exhalation sensor was fabricated as follows:

[0079] (1) According to the concentration required for film formation, take a certain quality of polyvinylidene fluoride, and heat and dissolve it in an oil bath in N,N'-dimethylformamide until it is uniform;

[0080] (2) According to the required concentration, weigh a certain mass of graphene oxide, dissolve it in water, add potassium hydroxide and polyethyleneimine, and react at 90 ° C for 24 hours to obtain reduced graphene oxide dispersed in polyethyleneimine , after c...

example 2

[0089] In this example, copper foil is used as the material of the first electrode, gold is used as the material of the second electrode, polyvinylidene fluoride + reduced graphene oxide is used as the diaphragm material, and the silver nanowire composite film is used as the second electrode and the surface at the same time. Enhanced Raman spectroscopy substrate with polydimethylsiloxane as encapsulation layer.

[0090] In this example, the self-powered exhalation sensor was fabricated as follows:

[0091] The preparation process of (1)~(4) is with example 1;

[0092] (5) Coating a layer of silver nanowire solution on the surface of the composite film, the concentration of which is 10 mg / mL, and drying at room temperature to form a surface-enhanced Raman spectrum substrate;

[0093] (6) Using polydimethylsiloxane as the encapsulation layer to complete the preparation of the self-powered exhalation sensor.

[0094] Figure 7 The spectrum of Raman detection results of 4-merca...

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Abstract

The invention discloses a self-energized expiration sensor and a preparation method thereof. The self-energized expiration sensor comprises an energy supply unit and a surface enhanced Raman spectroscopic substrate; the energy supply unit comprises a membrane, a first electrode and a second electrode, wherein the membrane has piezoelectric and dielectric properties, the first electrode is locatedbelow the membrane, and the second electrode is located on the membrane; and the surface enhanced Raman spectroscopic substrate is located on the second electrode of the energy supply unit and is usedfor detecting organic matter in expired air. On the one hand, the membrane is caused to deform through a blowing action in expiration detection to generate a charge, then an electric field is formed,and the electric field continuously achieves a self-energizing effect in a breathing process; and on the other hand, since the electric field generated by deformation of the energy supply unit can enhance local surface plasmon resonance of the surface enhanced Raman spectroscopic substrate, improvement to detection sensitivity is benefited.

Description

technical field [0001] The disclosure belongs to the technical field of sensors, and relates to a self-powered exhalation sensor and a preparation method thereof. Background technique [0002] Volatile organic compounds in human breath, such as acetone, methanol, hydrocarbons, etc., can be used as biomarkers for early diagnosis of lung cancer, gastric cancer and other diseases. Among them, Raman spectroscopy is a detection technique with relatively simple operation and low cost. Raman spectroscopy belongs to molecular vibration spectroscopy, which can reflect the characteristic structure of molecules. However, the Raman signal is very weak, and the Raman spectroscopy study of surface adsorbed molecules needs to use the enhancement effect. At present, there are two ways to greatly enhance the Raman scattering of the measured object, one is physical enhancement, and the other is chemical enhancement. Physical enhancement refers to the compounds adsorbed on the roughened meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65H02N2/18
CPCG01N21/658H02N2/185H02N2/22
Inventor 邓林李琳琳赵更锐其他发明人请求不公开姓名
Owner BEIJING INST OF NANOENERGY & NANOSYST