Humidity-sensitive Characteristic And Application Research Of Multi-walled Carbon Nanotubes/ Hydroxyethyl Cellulose Composite

Multi-walled carbon nanotube is a new kind of materials in sensor field. With its unique adsorption characteristic, researching humidity sensor based on multi-walled carbon nanotubes has actual significance to develop new humidity sensor and broaden its applications. In this thesis, the humidity properties of multi-walled carbon nanotubes/hydroxyethyl cellulose composite were analyzed and researched experimentally.Multi-walled carbon nanotubes were treated by mixed acids, and Fourier transform infrared spectroscopy and Raman spectroscopy were used to characterize it. Acids treatment can improve the dispersion of multi-walled carbon nanotubes in water and matrix, which is beneficial to the preparation of the composite and the improvement of its humidity performance. Analyze the humidity- sensitive mechanism of multi-walled carbon nanotubes, and on this basis, the humidity-sensitive mechanism of multi-walled carbon nanotubes/hydroxyethyl cellulose composite was systematically studied.Solution blending method was used to prepare multi-walled carbon nanotubes/ hydroxyethyl cellulose and multi-walled carbon nanotubes/silicone rubber composites. Study the effect of different matrixes on the humidity characteristics of composites. The results show that:multi-walled carbon nanotubes/hydroxyethyl cellulose composites are more sensitive to humidity, and have higher humidity sensitivity. The response-recovery characteristic, temperature characteristic, hysteresis characteristic and time stability characteristic of multi-walled carbon nanotubes/hydroxyethyl cellulose composite were also discussed.Research the applications of the humidity sensor based on multi-walled carbon nanotubes/hydroxyethyl cellulose composites in real life. The results show that:the sensor was sensitive to speaking and blowing behavior. In addition, the sensor can be used to measure flow rate. The preparation method of multi-walled carbon nanotubes /hydroxyethyl cellulose composite is simple and low cost, and it has great potential applications in the future.