Quick response and recovery type barium titanate nanofiber humidity dependent sensor

Abstract

The invention belongs to the technical field of sensor manufacture and relates to a quick response and recovery type barium titanate nanofiber humidity dependent sensor. Humidity response layers formed by a collection method on a base plate using a glass, mica or sapphire material as a non-conducting substrate is barium titanate nanofibers prepared by electrostatic spinning; the base plate is encapsulated in a sealed cavity type housing; electrode lead wires are led out through electrodes by using coaxial cables; two electrodes are fixed on the humidity response layers at two ends of the base plate respectively; and one electrode is connected in series with a current meter through a lead wire and then is connected with an end point of a rheostat, which is connected in parallel with a direct current power supply, while the other electrode is connected with the other end point of the rheostat, which is connected in parallel with the direct current power supply, so that the humidity sensor is formed. The quick response and recovery type barium titanate nanofiber humidity dependent sensor is characterized by simple manufacturing method, low cost, high production efficiency, large humidity sensitive width, high sensitivity and quick recovery and can be widely applied in various fields such as forestry and animal husbandry and the like.

Description

Technical field: [0001] The invention belongs to the technical field of sensor preparation, and relates to a nano-material humidity sensor device that utilizes a perovskite structure to respond quickly and restore immediately, in particular to a fast-response and recovery barium titanate nanofiber humidity sensor. Background technique: [0002] Generally, the humidity sensor is a detection device sensitive to humidity. At present, it is widely used in the fields of industrial manufacturing, medical and health, forestry and animal husbandry. The demand for humidity continues to grow, and the humidity sensors that are more widely used mainly include lithium chloride humidity sensors, carbon humidity sensors, alumina hygrometers, and ceramic-based humidity sensors. The basic mechanism of action of the ceramic-based humidity sensor is that when water molecules collide with the surface of the ceramic, some of the water molecules dissociate (or react with active ions in the cerami...

AI Technical Summary

Problems solved by technology

However, the moisture-sensitive characteristics of barium titanate bulk materials are not perfect, such as large hysteresis, long reaction and recovery time and other shortcomings. Although people have overcome the shortcomings of large hysteresis by doping and other methods, the reaction and recovery time Still not significantly improved (Sensors and Actuators B: Chemical 94 (2003) 290-293 and Thin Solid Films 515 (2007) 8776-8779)

In recent years, one-dimensional nanomaterials have become the focus of research due to their large specific surface area and other quantum effects. In particular, the characteristics of large specific surface area and high surface atomic activity can help improve the sensitivity of sensors and reduce response and recovery time. For example, China The patent (Application No. 200710056363.7, "Preparation of rapid response and recovery ceramic nanofiber humidity sensor by electrospinning method") reports a variety of titanium dioxide-based, zinc oxide-based and iron oxide-based electrospun fiber humidity sensors, and its response-recovery The time is 1-10 seconds, this length of time cannot be used for detection that requires a shorter response time

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