碳纳米管薄膜传感器的制备及其传感特性研究

发布时间：2018-03-28 10:34

  本文选题：碳纳米管薄膜　切入点：传感器　出处：《沈阳航空航天大学》2015年硕士论文

【摘要】：近年来，因结构形变引发的航空事故频发，飞机结构的实时健康监测成为有效的预防手段之一，，健康监测过程要求所用传感器应具有高灵敏度、结构相容等特点，而传统的传感器在结构相容方面考虑很少，且灵敏度偏低。 本文设计了一种高灵敏度的碳纳米管薄膜传感器，与结构基体一体成型，监测结构应变损伤和环境温度变化。综合了机械搅拌、超声处理、离心处理等分散工艺，实现了碳纳米管在水介质中的单分散，首次提出喷射吸滤法制备碳纳米管薄膜，利用场发射扫描电子显微镜和氮气吸附法表征碳纳米管薄膜的微观形貌及平均孔径，电学和力学测试表明碳纳米管薄膜导电性能优良，电阻率为0.042Ω·cm，力学断裂强度为1.45MPa。 碳纳米管薄膜的传感机理表明碳纳米管薄膜的电阻随应变的增大而增大，随温度的升高而减小。应变传感和温度传感实验表明碳纳米管薄膜对应变灵敏度较高，拉应变灵敏度系数分别为10.21（0~39000με）和524.79（39000~55000με），弯曲应变灵敏度系数为188.34（0~22500με）；具有较好的应变传感可逆性和可重复性。碳纳米管薄膜经退火处理后，升温过程电阻温度系数分别为-6.57%℃-1（20~100℃）和-3.25%℃-1（100~200℃），降温过程电阻温度系数分别为-5.79%℃-1（20~100℃）和-2.88%℃-1（100~200℃），具有较好的温度传感可逆性和重复性。
[Abstract]:In recent years, due to frequent aviation accidents caused by structural deformation, real-time health monitoring of aircraft structures has become one of the effective preventive measures. The sensors used in the process of health monitoring should have the characteristics of high sensitivity and structural compatibility. However, the conventional sensors are less sensitive and less sensitive in terms of structural compatibility. In this paper, a highly sensitive carbon nanotube thin film sensor is designed, which is integrated with the structure matrix to monitor the strain damage of the structure and the temperature change of the environment. The process of dispersion such as mechanical stirring, ultrasonic treatment, centrifugal treatment and so on is integrated. The monodisperse of carbon nanotubes in water medium was realized. The spray filtration method was proposed to prepare carbon nanotube films for the first time. The microstructure and average pore size of carbon nanotubes thin films were characterized by field emission scanning electron microscopy and nitrogen adsorption. The electrical and mechanical tests show that the carbon nanotube film has good electrical conductivity with a resistivity of 0.042 惟 cm and a mechanical fracture strength of 1.45 MPA. The sensing mechanism of the carbon nanotube film indicates that the resistance of the carbon nanotube film increases with the increase of strain and decreases with the increase of temperature, and the strain sensing and temperature sensing experiments show that the film is sensitive to strain. The strain sensitivity coefficient of tensile strain is 10.21 ~ 0 ~ (39 000 渭 蔚) and 524.79 ~ (39 000) ~ (55 000 渭 蔚), respectively, and the sensitivity coefficient of bending strain is 188.34 渭 蔚 ~ (22 500) 渭 蔚 ~ (-1), which has good strain sensing reversibility and repeatability. After annealing, the carbon nanotube film is annealed. The resistive temperature coefficients of the heating process are -6.57% -1C -20 鈩

本文编号：1675954