Dual-mode humidity sensor based on nickel iodide and preparation method of humidity sensor

Abstract

The invention provides a dual-mode humidity sensor based on optical / electrical sensitive characteristics of nickel iodide and a preparation method of the humidity sensor. The method comprises the preparation steps that the nickel iodide (NiI<2>) is dissolved in a solvent, stirring is performed under a heating condition to obtain a sensitive material, the sensitive material is transferred to different substrates, and humidity-sensitive characteristics of the sensitive material are tested. The result indicates that the material has a reversible black-transparent color changing behavior along with humidity changing, and the material shows an electrical sensitive behavior on humidity and also shows excellent sensitive characteristics under low humidity and even ultralow humidity. The dual-modehumidity sensor prepared based on a flexible substrate provided with an interdigital electrode has excellent optical and electrical sensitive characteristics. The sensitivity properties of the devicebasically maintain consistent in a bending or normal state. Through the dual-mode humidity sensor, environment humidity can be detected according to the color of the sensitive material and a sensor impedance change; the dual-mode humidity sensor has the advantages of being simple in production process, environment-friendly and the like; and the dual-mode humidity sensor with the characteristics has a huge application prospect in the wearable field.

Description

technical field [0001] The invention relates to a humidity sensor, in particular to a dual-mode humidity sensor based on nickel iodide and a preparation method thereof. Background technique [0002] Water vapor is one of the components of the atmosphere, and relative humidity is usually used to express the percentage of the actual water pressure in the air to the saturated water pressure at the current temperature. The level of humidity in the environment not only affects the preservation of industrial production and electronic devices, materials and other products, but also directly affects the health of the human body. Therefore, the realization of accurate detection of the full range of humidity is of great significance to industrial production and people's life. However, most of the current humidity sensors are difficult to accurately detect low humidity and high humidity. Low humidity detection plays an important role in the fields of gas drying, transformer manufactu...

AI Technical Summary

Problems solved by technology

[0003] At present, most humidity sensors detect humidity by collecting changes in electrical signals such as impedance and capacitance. The core of this type of sensor is its sensitive material, but the sensitive material often needs to go through a complicated preparation process

Moreover, the sensor signal also needs complex data processing to obtain the corresponding humidity, which is costly and technically complicated

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