Printable flexible ammonia gas sensor and making method thereof

A kind of ammonia sensor, flexible technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of difficult to ensure product yield and life, increase the difficulty and cost of preparation, not suitable for large-scale industrial production, etc., to achieve good stability , no preparation area requirements, and the effect of improving the efficiency of preparation

Active Publication Date: 2016-08-17
SHANGHAI JIAO TONG UNIV
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  • Summary
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  • Claims
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Problems solved by technology

For example, people have tried to prepare ammonia sensors based on metal oxides and conductive polymer materials. This type of sensor has high sensitivity coefficient and stability, but the preparation process of oxide films often requires high temperature treatment, and some metal oxides The annealing also needs to be carried out in vacuum, which greatly increases the difficulty and cost of preparation
Chinese patent CN 102928473A discloses that a p-type organic semiconductor poly(3-alkyl)thiophene is used as a raw material for the functional layer, and a new type of ammonia sensor is prepared by combining oxidation and vacuum evaporation, but ammonia gas is prepared by this method The sensor takes a long time, requires a higher temperature, and also requires a higher temperature for detection, which is not suitable for large-scale indu...

Method used

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  • Printable flexible ammonia gas sensor and making method thereof

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preparation example Construction

[0033] The preparation method of described printable flexible ammonia sensor comprises the steps:

[0034] 1) The flexible substrate 1 is ultrasonically cleaned with cleaning solution, acetone and isopropanol in sequence, and the ultrasonic cleaning time is 10-20 minutes.

[0035] 2) Depositing a layer of the ammonia sensitive layer 2 on the surface of the flexible substrate 1, and then annealing at a low temperature; the ammonia sensitive layer 2 is prepared by scraping, spin coating, spray coating or dipping-pulling.

[0036] 3) Prepare an interdigitated electrode 3 based on conductive silver ink on the upper surface of the ammonia sensitive layer 2, and then anneal at a low temperature, the annealing temperature is 50-150°C, and the annealing time is 5-100min; the interdigitated electrode 3 Prepared by inkjet printing, dispensing or screen printing.

Embodiment 1

[0038] Firstly, the transparent flexible substrate 1 of polyethylene terephthalate is cleaned in advance, and the polyethylene terephthalate film is sequentially immersed in the cleaning solution, acetone and isopropanol, and ultrasonicated for 15 minutes each time. After ultrasonication, the flexible substrate 1 is taken out and blown dry by a nitrogen gun for use. Configure poly(3,4-ethylenedioxythiophene): a composite solution of polystyrene sulfonate and silver nanowires, the configuration process is carried out in aqueous solution, and control the silver nanowires and poly(3,4-ethylenedioxythiophene) Thiophene): the composite weight ratio of polystyrene sulfonate is 50%. A uniform thin film was deposited on the transparent flexible substrate 1 by scraping the prepared composite solution, the thickness of the thin film was controlled at 100-120 nm, and then annealed at 120° C. for 20 minutes to obtain the ammonia sensitive layer 2 . After the film is fully dried, a conduc...

Embodiment 2

[0040] Firstly, the transparent flexible substrate 1 of polyimide is cleaned in advance, and the polyimide substrate is sequentially immersed in cleaning solution, acetone and isopropanol, and ultrasonicated for 10 min each time. After ultrasonication, the flexible substrate 1 is taken out and blown dry by a nitrogen gun for use. The composite solution of the polyaniline and the gold nanowire is configured, and the configuration process is carried out in a mixed solution of ethanol and isopropanol, and the composite weight ratio of the gold nanowire and the polyaniline is controlled to be 100%. A uniform thin film was deposited on the transparent flexible substrate 1 by spin coating from the prepared composite solution, the thickness of the thin film was controlled at 100-120 nm, and then annealed at 150° C. for 10 min to obtain the ammonia sensitive layer 2 . After the film is fully dried, a conductive ink electrode based on silver nanowires is prepared on it by screen printi...

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Abstract

The invention discloses a printable flexible ammonia gas sensor. The printable flexible ammonia gas sensor comprises a flexible substrate, an ammonia gas sensitive layer and interdigital electrodes, wherein the ammonia gas sensitive layer is a composite film formed by a conductive polymer and metal nano-wires, and covers the flexible substrate; and the interdigital electrodes are made of a conductive silver ink material, and are coated on the ammonia gas sensitive layer. The ammonia gas sensitive layer is made of a conductive polymer and metal nano-wire composite system, and a making method of the ammonia gas sensor adopts a low temperature solution technology, so the ammonia gas sensor made in the invention has the advantages of high sensitivity, fast response speed and good stability, and the making method has the advantages of simplicity, no requirement for the making area, suitableness for large-scale production, realization of simultaneous production of a plurality of devices on a same substrate, great improvement of the making efficiency, and reduction of the industrial production cost.

Description

technical field [0001] The invention relates to a flexible sensor, in particular to a printable flexible ammonia sensor and a preparation method thereof, belonging to the technical field of electronic devices. Background technique [0002] Ammonia is a colorless and highly toxic gas, which is highly toxic to the human body. Acute ammonia poisoning will cause symptoms such as coughing and suffocation. Chronic ammonia poisoning will cause chronic bronchitis, emphysema and other respiratory diseases. Ammonia can cause great harm to human health at low concentrations, so ammonia detection is of great significance in many fields such as industry, medicine, refrigeration, agriculture, atmospheric detection, and national defense. The ammonia gas sensor uses the strong sensitivity of a certain substance to ammonia, and a small change in the amount of ammonia will cause a large change in some physical or chemical properties of the substance, such as resistance, temperature, burning p...

Claims

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Application Information

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IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 郭小军李思莹陈苏杰卓本刚
Owner SHANGHAI JIAO TONG UNIV
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