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Passive wireless gas sensor based on NFC tag and preparation method thereof

A gas sensor, passive wireless technology, applied to record carriers, antennas, instruments, etc. used in machines, can solve the problems of complex detection, high cost, limited measurement range and sensitivity of wireless gas sensors, and achieve high sensitivity and response. The effect of speed, high sensitivity, structural design and simple fabrication process

Inactive Publication Date: 2017-06-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of realization method of the passive wireless gas sensor based on NFC (near field communication) label, this passive wireless gas sensor especially has higher sensitivity to toxic gases such as ammonia and volatile organic amine and response speed, and the detection method is simple and low cost, so as to solve the problems of existing wireless gas sensors, such as limited measurement range and sensitivity, complex detection and high cost, and also provide a new idea for the design of gas sensors

Method used

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  • Passive wireless gas sensor based on NFC tag and preparation method thereof
  • Passive wireless gas sensor based on NFC tag and preparation method thereof
  • Passive wireless gas sensor based on NFC tag and preparation method thereof

Examples

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Effect test

Embodiment 1

[0050] (1) The NFC resonant antenna is made by vacuum evaporation process, and then the NFC tag is made. At this time, the NFC tag can be read by the NFC reader;

[0051] (2) Use a blade to remove a small section of the NFC resonant antenna in the NFC tag, interrupt the NFC tag, so that the NFC tag cannot be read by the NFC reader;

[0052] (3) The polyaniline hydrogel doped with phytic acid (0.5-2wt%) was synthesized by in-situ polymerization, and the polyaniline hydrogel of the phytic acid system was dropped on the NFC tag with a pipette before the gel , to replace a small section of NFC resonant antenna that was removed, and dry it at room temperature. At this time, the NFC tag can be read by the NFC reader;

[0053] (4) Put the sensor, that is, the modified NFC tag, close to a small piece of carrion. The biogenic amine released by the carrion reacts with the gas sensor unit. The NFC reader is used to detect the sensor, and the reflection coefficient of the sensor gradually...

Embodiment 2

[0055] (1) Use the electroplating process to make the NFC resonant antenna, and then make the NFC tag. At this time, the NFC tag can be read by the NFC reader;

[0056] (2) The polyaniline hydrogel doped with p-toluenesulfonate iron was synthesized by in-situ polymerization, and the polyaniline hydrogel of the phytic acid system was dropped on the NFC tag with a pipette before the gel, and the air The sensitive unit is coated between the adjacent coils of the NFC resonant antenna and dried at room temperature. At this time, the NFC tag cannot be read by the NFC reader.

[0057] (4) The sensor, that is, the modified NFC tag, is exposed to 5PPm putrescine (ammonia), and the NFC tag can be read by the NFC reader again after 2 minutes. The passive wireless detection of organic amines is realized.

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Abstract

The invention discloses a passive wireless gas sensor based on an NFC tag. The passive wireless gas sensor comprises an NFC chip, a resonant antenna connected with two ends of the NFC chip, a gas-sensitive thin film integrated on the NFC resonant antenna, and NFC equipment for reading gas concentration information, wherein a working band of the NFC chip is an HF band, and polyaniline and a compound of the polyaniline and metallic oxide form the gas-sensitive thin film. A mode of integrating the gas-sensitive thin film on the NFC tag is a series mode, wherein the gas-sensitive thin film is a part in series connection with the NFC resonant antenna; or when a connection form between the gas-sensitive thin film and the NFC resonant antenna is parallel connection, the gas-sensitive thin film is coated between adjacent coils of the NFC resonant antenna.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a passive wireless gas sensor based on an NFC tag and an implementation method thereof. Background technique [0002] Gas sensors are widely used in industrial production, environmental monitoring, safety protection, food spoilage detection and other fields. Most of the gas sensors currently on the market are made of metal oxide semiconductor materials. To realize wireless signal detection, complex circuit parts need to be added, which has the disadvantages of complex structure, large power consumption, and high cost. The passive wireless gas sensor does not need battery power supply and signal line connection, and has the advantages of simple structure, flexible use method, long service life and easy maintenance. [0003] In the published patent application 201510009558.0, the traditional gas sensing technology and radio frequency identification technology are combined, the electroni...

Claims

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Application Information

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IPC IPC(8): G01N27/04G06K19/077H01Q1/22
CPCH01Q1/2225G06K19/07775G01N27/023G01N27/04
Inventor 潘力佳鄢锟马仲严可施毅
Owner NANJING UNIV