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In this study, a carbon nanotubes (CNT) yarn-based strain sensor with excellent durability and stability was developed for structural healthy monitoring. CNT yarns were directly spun from the CNT array, and the electrical resistance increased linearly according to the applied strain, exhibiting excellent strain sensor characteristics. The fabricated strain sensor underwent repeatable performance evaluation testing and exhibited stable sensor operation characteristics by showing constant piezoresistance characteristics. In addition, this sensor can be easily installed without causing a weight increase or damage to the composite structure. It was verified that the sensor is capable of monitoring crack occurrences and propagation in a structure. [ABSTRACT FROM AUTHOR]

This paper proposes a simple and efficient method to develop a nanocomposite by depositing platinum (Pt) nanoparticles on a carbon nanotube (CNT) sheet, and experimentally verifies the applicability of the proposed nanocomposite as a reliable and sensitive carbon monoxide (CO) gas sensor that operates at room temperature. A Pt-CNT nanocomposite shows improved CO gas sensing properties compared with the pristine CNT sheet. Owing to its large surface area and high conductivity, a CNT sheet exhibits improved sensitivity and fast response and recovery times. Based on the Pt-CNT nanocomposite implemented by the proposed method, we fabricated a Pt-CNT sheet-based CO gas sensor operating at room temperature and experimentally verified its stable and reliable room temperature sensing properties and excellent structural flexibility. [ABSTRACT FROM AUTHOR]

This paper presents a thermal convection-based sensor, which is fabricated using carbon nanotube (CNT) yarn. The key element in this device is the non-symmetrically distributed, heated air medium around the heater, particularly when it experiences acceleration and/or changes in inclination. Therefore, it can withstand much higher accelerations/inclination than conventional sensors that use a proof mass. However, a major challenge for the design of this type of sensor is the high heating power (in the order of tens of milliwatts) required to facilitate thermal convection in a sealed chamber. In order to reduce the high heating power, CNTs are investigated as materials for both the heater and the temperature sensors. Moreover, this paper discusses experiments that were performed by varying several parameters, such as the heating power, distance between the heater and temperature sensors, the gas medium used, and air pressure. [ABSTRACT FROM AUTHOR]