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CN-122010117-A - Ti (titanium)3C2Tx/Fe2O3CNTs moisture sensitive material and preparation method thereof

CN122010117ACN 122010117 ACN122010117 ACN 122010117ACN-122010117-A

Abstract

A Ti 3 C 2 T x /Fe 2 O 3 /CNTs humidity sensitive material and a preparation method thereof, ti 3 C 2 T x is used as a template, fe 2 P 3 is generated by hydrothermal reaction with FeCl 3 and self-assembled on the surface of Ti 3 C 2 T x to finally form a Ti 3 C 2 T x /Fe 2 P 3 material, the Ti 3 C 2 T x /Fe 2 O 3 material and a uniform aqueous dispersion of carbon nanotubes (/ CNTs) are fully mixed, and the materials are assembled together by Van der Waals force to obtain the Ti 3 C 2 T x /Fe 2 O 3 /CNTs composite material. Ti 3 C 2 T x has rich surface properties and excellent structural stability, provides an ideal platform for generating Fe 2 O 3 nano particles, and CNTs are connected with each Ti 3 C 2 T x /Fe 2 P 3 lamellar structure to form a continuous and stable conductive network. The network structure formed by connecting CNTs is like an electronic transmission 'expressway', can extremely sensitively transfer out the integral resistance change of the material caused by water molecule adsorption/desorption, and amplifies the signal response of the sensor. The preparation method can obtain the humidity sensitive material with high sensitivity and excellent responsiveness, has simple preparation process, and can be applied to the fields of industry, environmental monitoring, medical treatment and the like.

Inventors

  • SHI JIAZI
  • Yuan Jingtong
  • WEI JIAQI
  • QIAN CHENGCHAO
  • LIN MEICHEN
  • ZHANG GAIMEI
  • FU YABO
  • LIU HUI
  • ZHANG XINLIN
  • LIAO RUIJUAN

Assignees

  • 北京印刷学院

Dates

Publication Date
20260512
Application Date
20260116

Claims (8)

  1. 1. A Ti 3 C 2 T x /Fe 2 O 3 /CNTs humidity sensitive material is characterized in that carbon nanotubes in the humidity sensitive material are attached to the surface of layered Ti 3 C 2 T x /Fe 2 O 3 , and a continuous and stable conductive network is formed on the surface of a layered structure.
  2. 2. The method for preparing the Ti 3 C 2 T x /Fe 2 O 3 /CNTs wet-sensitive material according to claim 1, comprising the steps of: (1) Adding Ti 3 C 2 T x powder into a sodium citrate solution for ultrasonic dispersion, and adding isopropanol into the solution to obtain Ti 3 C 2 T x dispersion; (2) Mixing Ti 3 C 2 T x dispersion with FeCl 3 solution, and performing ultrasonic treatment to fully mix the materials; (3) Transferring the mixed materials into a hydrothermal reaction kettle for hydrothermal reaction, naturally cooling to room temperature, and centrifugally drying the materials to obtain a Ti 3 C 2 T x /Fe 2 O 3 composite material; (4) Dissolving carbon nano-tubes and polyvinylpyrrolidone (PVP) into water to form an aqueous dispersion of the carbon nano-tubes; (5) And (3) fully mixing Ti 3 C 2 T x /Fe 2 O 3 with the aqueous dispersion of the carbon nano tube, carrying out ultrasonic vibration, and centrifugally drying the material to obtain the Ti 3 C 2 T x /Fe 2 O 3 /CNTs composite material.
  3. 3. The method of claim 2, wherein the Ti 3 C 2 T x /Fe 2 O 3 /CNTs moisture sensitive material is prepared from 30-70mg of Ti 3 C 2 T x powder, 0.1-0.3mol/L of sodium citrate solution, 50-70mL of isopropyl alcohol and 1-3mL of isopropyl alcohol in step (1).
  4. 4. The method of claim 2, wherein the FeCl 3 solution in the step (2) has a mass concentration of 45% and a volume of 50 to 400. Mu.L.
  5. 5. The method for preparing Ti 3 C 2 T x /Fe 2 O 3 /CNTs moisture sensitive material according to claim 2, wherein the hydrothermal reaction temperature in step (3) is 120-180 ℃ and the reaction time is 10-20h.
  6. 6. The method of claim 2, wherein the carbon nanotubes in the step (4) are 40-60mg, PVP is 260-320mg, and the mixture is dissolved in 30-60ml of water.
  7. 7. The method of claim 2, wherein in the step (5), ti 3 C 2 T x /Fe 2 O 3 is 5-15mg, and the aqueous dispersion of carbon nanotubes is 1-2ml.
  8. 8. A humidity sensor, characterized in that the humidity sensor contains the Ti 3 C 2 T x /Fe 2 O 3 /CNTs humidity-sensitive material as set forth in any one of claims 1-6.

Description

Ti 3C2Tx/Fe2O3/CNTs humidity-sensitive material and preparation method thereof Technical field: the invention belongs to the technical field of nano sensitive materials, and particularly relates to a humidity sensitive material for detecting humidity at room temperature and a preparation method thereof. The background technology is as follows: Humidity (H 2 O) is a critical environmental parameter and has a wide influence on industrial production, agricultural activities and daily living. H 2 O is an important product of organism metabolism, and human respiration and changes in humidity on the skin surface can be used to monitor dehydration or to assess skin health. For example, the medical field may assist in diagnosing lung disease or metabolic abnormalities by monitoring the humidity level in the patient's respiratory gases. In addition, humidity is an important control index for many industrial processes (e.g., pharmaceutical, semiconductor manufacturing) that directly affects product quality. Therefore, real-time accurate humidity monitoring has important values for guaranteeing health, improving production efficiency and improving living environment. Particularly, excessive humidity may affect electronic device performance, food storage safety, and human comfort, and even cause mold growth or respiratory problems. The detection and control of high humidity is of great significance in modern society. In various humidity detection methods, humidity sensors become the most commonly used tools due to the advantages of quick response, high sensitivity, easiness in integration and the like, and development of high-performance humidity sensitive materials is a core foundation for realizing accurate measurement, particularly in a high-humidity environment, many sensors drift and fail, so that development of humidity sensitive materials with accurate and quick response to the high-humidity environment is particularly important. MXene is a new class of two-dimensional transition metal carbides or nitrides, an abbreviation for the two-dimensional transition metal carbide, nitride and carbonitride families, and the suffix "ene" emphasizes their similarity to graphene. MXene has the general formula M n+1XnTx (n=1, 2, 3), where M represents a transition metal, such as titanium, vanadium, chromium or manganese, X represents carbon and/or nitrogen, T represents a surface group such as O 2-、OH-、F-、NH2- or NH 4+, and Ti 3C2Tx is one of the typical MXene materials. Due to high metal conductivity, abundant surface functional groups and unique lamellar structure, the two-dimensional Ti 3C2Tx material has good application prospect in a gas sensor, and particularly has excellent sensing performance on humidity change. However, the Ti 3C2Tx material is easy to generate irreversible oxidation and interlayer stacking in practical application, so that the active site is lost, and meanwhile, the wet hysteresis effect and the response recovery speed are difficult to meet the application requirements. For this reason, in order to solve these problems, it is necessary to enhance the density of adsorption sites on the surface of the MXene while suppressing the oxidation of the MXene, and to provide more sites for adsorption of water molecules, this can be achieved by preparing Ti 3C2Tx -based composite materials. The invention comprises the following steps: The invention aims to solve the problems of low sensitivity, low high humidity environment responsiveness and the like of a humidity sensor, and provides a preparation method of a Ti 3C2Tx/Fe2O3/CNTs humidity sensitive material, which can obtain the humidity sensitive material with high sensitivity and high responsiveness under high humidity, has a simple preparation process, and can be practically applied in the fields of industry, environment monitoring, medical treatment and the like. In order to solve the technical problems, the invention is realized by the following technical scheme: The invention provides a preparation method of the Ti 3C2Tx/Fe2O3/CNTs humidity-sensitive material, which comprises the following preparation steps: (1) Adding Ti 3C2Tx powder into a sodium citrate solution for ultrasonic dispersion, and adding isopropanol into the solution to obtain Ti 3C2Tx dispersion; (2) Mixing Ti 3C2Tx dispersion with FeCl 3 solution, and performing ultrasonic treatment to fully mix the materials; (3) Transferring the mixed materials into a hydrothermal reaction kettle for hydrothermal reaction, naturally cooling to room temperature, and centrifugally drying the materials to obtain a Ti 3C2Tx/Fe2O3 composite material; (4) Dissolving carbon nano-tubes and polyvinylpyrrolidone (PVP) into water to form an aqueous dispersion of the carbon nano-tubes; (5) And (3) fully mixing Ti 3C2Tx/Fe2O3 with the aqueous dispersion of the carbon nano tube, carrying out ultrasonic vibration, and centrifugally drying the material to obtain the Ti 3C2Tx/Fe2O3/CNTs composite material. Further, in