Gas Sensor And Near Field Communication Sensor Characteristic Research Based On Polyaniline

In modern society,many factors affect our health and quality of life,such as environmental pollution of ammonia.Therefore,it is very important for us to detect the concentration of ammonia in the environment and gas sensor is an effective detection method.On the other hand,food safety is very important to our health and meat is an essential part of our food supply.But rotten meat is harmful to our health,because meat in the process of corruption will produce biogenic amines?including cadaverine,putrescine etc.?.So it is necessary for us to pay attention to the detection of meat spoilage.We can determine the degree of meat spoilage by detecting biogenic amines.What's more,biogenic amines are volatile organic amines,so biogenic amines can be detected by gas sensing method.The gas sensing technology transforms the information of the type and concentration of the gas into the electrical signal which can be detected easily.NFC near field communication technology is developing rapidly.At the same time,the product form of NFC is more and more rich,a typical product of which is the NFC tag.The NFC tag includes the NFC chip and the NFC antenna.When the NFC tag is scaned by other devices,some convenient applications can be achieved.The attached material on the NFC antenna and the surrounding physical and chemical environment will affect the impedance and gain of the NFC tag.In this paper,based on polyaniline and the NFC tag,the work will be carried out in the following several aspects:?1?The PANI of phytic acid system is used as the sensitive material of gas sensor,and the gas response properties of ammonia and biogenic amines are tested.?2?The PANI/CeO₂ compound of phytic acid is synthesized and used as the sensitive material of gas sensor.At the same time,the gas response properties of ammonia and are tested.?3?The PANI of toluene-p-sulfonic acid is synthesized and used as the sensitive material for gas sensor.The gas response properties of ammonia and biogenic amines are tested.?4?This paper introduces two types of near field communication sensors,turn-off sensor and turn-on sensor,and elaborates the design and the gas response properties of the two kinds of near field communication sensors.The turn-off sensor is fabricated by using a two-step method.Firstly,the antenna of a standard NFC tag is broken.Then the broken place of the tag antenna is filled with conductive polymer PANI sensitive material.The turn-on sensor is fabricated by one-step method,and the PANI sensitive material is directly integrated into the NFC tag antenna without interrupting the NFC tag.So we realize the wireless detection of gas.