A superhydrophilic biomimetic matrix water content sensor and its preparation method

Abstract

Disclosed are a super-hydrophilic bionic sensor for the moisture content of matrices and a preparation method therefor. The sensor comprises a base (1), a micro-nano texture layer (2), a sensitive layer (3) and electrode leads (4), wherein the base (1) is made of an aluminium oxide ceramic material, the micro-nano texture layer (2) comprises an epoxy resin layer (21) and a hydrophilic nano silicon oxide layer (22), the sensitive layer (3) is a hydrophilic graphene oxide material thin layer (31), and the electrode leads (4) comprise a nickel transition layer (41) and a silver layer (42). The preparation method comprises: the base (1) is prepared, and a groove (11) is formed in the front face of the base (1); the micro-nano texture layer (2) is prepared, the epoxy resin layer (21) is obtained using a spin-coating method, the hydrophilic nano silicon oxide is prepared by a vapour phase method, the hydrophilic nano silicon oxide layer (22) is obtained, and cylindrical pits are processed in the surface micro texture of the hydrophilic nano silicon oxide layer (22); the electrode leads (4) are prepared; and the sensitive layer (3) is prepared, and the graphene oxide thin layer is obtained. The sensor of the present invention has the advantages of being super-hydrophilic, self-cleaning and the like, and has a high detection sensitivity and good stability with respect to water molecules.

Description

technical field [0001] The invention belongs to the application field of a novel substrate water content sensor, and in particular relates to a super-hydrophilic bionic substrate water content sensor and a preparation method thereof, which are used for in-situ measurement of soil with a certain water content and the water content of a cultivation substrate. Background technique [0002] Soil and cultivation substrate are a mixture of minerals and organic matter, mainly solid particles, but there are certain gases and liquids in the gaps between solid particles, which belong to a heterogeneous system. Its complex composition, as well as heterogeneous mixed state, make the soil matrix exhibit a wide range of different physical and chemical properties. In addition, because part of the soil and the matrix itself are relatively loose and not compact enough, the detection contact is poor, which leads to poor adaptability to its parameter detection, low detection sensitivity, large...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of in-situ measurement of the moisture content of soil cultivation substrates, and propose a super-hydrophilic bionic substrate moisture content sensor and its preparation method, which are used to realize the in-situ measurement of the moisture content of heterogeneous systems such as soil and cultivation substrates. Measurement, the invention comprehensively applies the resistance logarithm of the graphene oxide film and the relative humidity is linear, and the sensor made by the graphene oxide film reflects the water content in the detected substrate, as well as the super-hydrophilic structure and graphene oxide on the surface of the sensitive layer of the sensor. The hydrophilic properties of the oxygen-containing functional groups in the thin layer of the sensitive material can greatly enhance the contact effect between the sensor and the water molecules in the detected matrix, and significantly improve the sensitivity and stability of the sensor to water, thereby effectively overcoming the problem caused by the looseness of the matrix itself. Poor detection contact, low sensitivity, large error, poor stability, etc.

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