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A fast-response resistive humidity sensor and its preparation method and application

A humidity sensor and fast response technology, applied in the field of electrochemical sensing, can solve the problems of further improvement in sensitivity and detection range, insufficient long-term stability, narrow detection range, etc., and achieve excellent stability, good sensitivity, and wide detection range Effect

Active Publication Date: 2021-07-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, many humidity sensors have been developed and utilized and have been put into commercial production, but there are generally problems such as slow response speed, sensitivity and detection range to be further improved
The main humidity-sensitive materials are as follows: metal oxide semiconductors, which are cheap but have slow response speed and poor selectivity; conductive polymers, which are easy to functionalize, but have insufficient long-term stability; electrolyte-type humidity-sensitive materials, which are cheap but Often the detection range is narrow

Method used

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  • A fast-response resistive humidity sensor and its preparation method and application
  • A fast-response resistive humidity sensor and its preparation method and application
  • A fast-response resistive humidity sensor and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 prepares carbon nitride nanowire

[0034] 1. Materials and instruments: dicyandiamide, sodium hydroxide, dialysis bag, muffle furnace, IKA temperature-controlled stirrer, Thermo Fisher pure water system;

[0035] 2. Method: Weigh 5g of dicyandiamide into a crucible, put the crucible into a muffle furnace for high temperature treatment at 550°C for 4 hours, then cool naturally to room temperature, and grind the product with an agate mortar to obtain CN powder. Weigh 300mg of CN powder and add it into a 50mL round-bottomed flask with a magnet, then add 20mL of NaOH solution (concentration: 3mol / L) into the flask, and stir the mixture in an oil bath at 70°C for 6h. After the reaction, the dispersion was put into a dialysis bag with a molecular weight cut-off of 3500Da, and dialyzed to neutrality with deionized water.

[0036] 3. Results: uniform and stable dispersed carbon nitride nanowires were prepared, such as figure 1 As shown, its morphology was observe...

Embodiment 2

[0037] Example 2 Preparation of carbon nitride nanowires

[0038] It is basically the same as Example 1, except that the concentration of the NaOH solution is 0.5mol / L, the temperature of the oil bath is 80°C, the molecular weight cut-off of the dialysis bag is 1000Da, and the prepared carbon nitride nano Line is with embodiment 1.

Embodiment 3

[0039] Example 3 Preparation of carbon nitride nanowires

[0040] It is basically the same as Example 1, except that the concentration of the NaOH solution is 8mol / L, the temperature of the oil bath is 60°C, the molecular weight cut-off of the dialysis bag is 5000Da, and the prepared carbon nitride nanowire , the prepared carbon nitride nanowires are the same as in Example 1.

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Abstract

The invention provides a fast-response resistance humidity sensor and a preparation method thereof, which are applied to a real-time breath detection system. In the present invention, the active material dispersion is deposited on the surface of the interdigitated electrode by methods such as drop coating, spray coating, spin coating, etc., and after drying, a two-electrode humidity sensor is obtained. The electrode is connected to a resistance testing device and can be applied to the detection of humidity. The sensor has It has the advantages of fast response speed, high sensitivity, wide detection range and good selectivity. The present invention monitors the breathing process of the user in real time by utilizing the fast-response humidity sensor, so as to realize the evaluation of respiratory function and the diagnosis of diseases.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensing, and in particular relates to a fast-response resistance-type humidity sensor and its preparation method and application. Background technique [0002] The human breathing process is of great significance to life and health. The monitoring of breathing is an effective means of disease prevention and diagnosis, especially the monitoring of sleep breathing, in sleep disordered breathing (SDB) and obstructive sleep apnea (OSA) and the diagnosis of central sleep apnea (CSA) is of great significance. Although many kinds of commercial monitoring equipment have been developed, such as polysomnography (PSG), etc., the existing methods are usually by detecting the flow rate of respiratory gas, nasal cavity pressure, blood oxygen saturation and the fluctuation of chest and abdomen breathing. To obtain a variety of signals to monitor respiration, but these methods can only obtain basic infor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12A61B5/08B82Y15/00B82Y30/00
CPCA61B5/08B82Y15/00B82Y30/00G01N27/121G01N27/127
Inventor 张袁健张玉叶沈艳飞刘松琴
Owner SOUTHEAST UNIV