Printable flexible ammonia gas sensor and making method thereof

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...

AI Technical Summary

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 industrial production

Later, some researchers found that carbon nanotubes and graphene combined with some polymers are also highly sensitive to ammonia. For example, patent CN 103076370A uses carbon nanotubes and PABS composite system materials as functional layers, and combines inkjet printing technology A flexible ammonia sensor with high sensitivity has been prepared, but the cost of carbon nanotubes or graphene itself is relatively high, and the preparation process of the film generally requires a high temperature treatment process, and its dispersion and stability are relatively low. Poor, so it is difficult to guarantee the yield and life of the product after entering industrial production, so it is necessary to find some new materials and processes for the preparation of ammonia sensors to meet the needs of industrial production development

Images