Humidity sensor based on stannic oxide/graphene-like molybdenum disulfide film

Abstract

The invention discloses a humidity sensor based on a stannic oxide / graphene-like molybdenum disulfide film. The humidity sensor comprises a humidity sensing element, a capacitance-voltage conversion circuit, an STM32F103 microprocessor, an SI4432 wireless communication module and an acousto-optic alarm. The humidity sensing element adopts the stannic oxide / graphene-like molybdenum disulfide film as a humidity-sensitive sensing film and is deposited on a polyethylene glycol terephthalate substrate having an interdigital electrode shape as a Chinese character hui. The detection of the ambient humidity is realized by measuring the capacitance change of the stannic oxide / graphene-like molybdenum disulfide film; the humidity sensor has the functions of data acquisition, storage, display and acousto-optic alarm, and has the capabilities of transmitting monitoring data to an upper computer and wireless remote communication and realizing effective and real-time monitoring and management by making an alarm according to a set value. The sensor has the advantages of high sensitivity, fast response, stability and reliability and is applicable to real-time monitoring of the humidity in an Internet of Things environment.

Description

technical field [0001] The invention relates to a humidity sensor and a manufacturing method thereof, in particular to a capacitive humidity sensor based on a tin dioxide / graphene-like molybdenum disulfide film. Background technique [0002] Humidity sensor has important influence and extensive application background in the sensor field, not only directly affecting the basic living conditions of human beings, but also affecting the industrial and agricultural, biological products, medical and health, environmental protection industry, power system monitoring, national defense construction and aerospace. etc. have a great impact. For example, in the monitoring of the insulation status of power transformers: 90% of power transformers used in power plants and substations in my country are oil-immersed transformers. The insulation system of such transformers is mainly insulating oil and insulating paper. The change of the insulation performance will lead to serious deterioration...

AI Technical Summary

Problems solved by technology

The humidity sensor is the core component of the humidity sensor to detect the humidity of the external environment. At present, high molecular polymers, polyethylene terephthalate materials, and metal oxides are mostly used as humidity sensitive materials for capacitive humidity sensors. High molecular polymers Humidity-sensitive devices are widely used, but due to the poor high-temperature resistance of the moisture-absorbing layer, this type of sensor cannot be used in high-temperature environments, and severe hysteresis occurs under high-humidity conditions; semiconductor ceramic-type humidity-sensitive devices have stable performance , high temperature applicability, wide detection range, etc., but it is easily interfered by environmental smoke and organic gas, and needs to be heated regularly to regenerate its humidity sensitive characteristics; metal oxide humidity sensor has the characteristics of high temperature resistance and high sensitivity, but only Work requires high temperature, high power consumption, short life and other disadvantages

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