A kind of preparation method of pedot:pss base flexible ammonia gas sensor

Abstract

The invention discloses a preparation method of a PEDOT:PSS (poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate)) based flexible ammonia sensor, which comprises the steps of preparing PEDOT:PSS into ink suitable for printing on an ordinary ink-jet printer, depositing an ammonia sensitive material layer on an interdigital electrode in an ink-jet printing manner, printing a ferric chloride aqueous solution on the ammonia sensitive material layer in an ink jet manner, and performing deposition to form a doping material to accomplish preparation of the ammonia sensor. The prepared ammonia sensor has better response to ammonia at different concentrations, is highly sensitive to the low-concentration ammonia and wide in detection range and has the characteristics of short response time, highstability and good gas selectivity; a lower detection limit of the ammonia reaches 1ppm; the sensor is suitable for highly sensitive detection of the ammonia at the room temperature; and the preparedammonia sensor is good in flexibility and low in working temperature, and can be combined with wearable equipment to be applied to the ammonia detection in a surrounding environment of a human body and detection of human body breathing gas so as to give an early warning for a human health condition.

Description

technical field [0001] The invention belongs to the technical field of gas detection, and in particular relates to a preparation method of a PEDOT:PSS-based flexible ammonia sensor. Background technique [0002] The development of high-performance flexible room temperature gas sensors is of great significance to the fields of environmental detection, human health early warning, military defense and other fields. For example, a low concentration of ammonia can quickly irritate the eyes and moist skin, and when the concentration of ammonia is too high (>25ppm), it will cause greater damage to the human respiratory organs. In addition, medical research has shown that the concentration of ammonia gas in the breath exhaled by a healthy human body is on the order of ppb, while the concentration of ammonia gas in the gas exhaled by patients with renal failure is generally greater than 1ppm. early warning. [0003] In terms of ammonia detection, researchers have found that meta...

AI Technical Summary

Problems solved by technology

However, in a large number of reports, metal oxides require a very high reaction temperature in ammonia detection, which is not conducive to low-cost and wearable devices. For example, the Chinese invention patent application with publication number CN106365204A discloses a method for ammonia The preparation method of the tungsten trioxide sensitive material of the gas sensor, wherein in the ammonia gas response test, the working temperature of the sensor with a better ammonia gas response is 360°C, and the working temperature is relatively high

However, carbon nanotubes and graphene require high-temperature treatment, which is not conducive to large-scale and low-cost manufacturing, and has low sensitivity. For example, the Chinese invention patent application with publication number CN104458826A discloses a new type of ammonia sensor and its preparation process. Using electrospinning and in N 2 In 400 ℃ ~ 600 ℃ and 650 ℃ ~ 850 ℃ respectively calcined once, in addition, the response of 10ppm ammonia gas is about 4%, the manufacturing method is complicated and the sensitivity is low

Conductive polymers such as poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) have good sensitivity to ammonia gas, can work at room temperature, have good stability, and low cost, etc. advantages, attracting the attention of researchers. For example, the Chinese invention patent application with publication number CN105866175A discloses a printable flexible ammonia sensor and its preparation method, which uses a mixture of conductive organic matter and metal nanowires as ammonia sensitive materials, and manufactures developed a flexible ammonia sensor, but the simple poly(3,4-ethylenedioxythiophene): polystyrene sulfonate ammonia sensor has a narrow test range in practical applications, and it is not suitable for low-concentration ammonia (less than 10ppm) insensitivity, long test time and other shortcomings, which are not conducive to practical application

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