Application Status of Carbon Nanotubes in Fire Detection Sensors

Abstract

With the rapid development of the city, all kinds of high-rise buildings, large shopping malls and entertainment places have been built one after another. There are some hidden dangers of fire accidents. Effective prevention and monitoring of fire is the focus of fire prevention and control field. As the information source of fire prevention and control, the preparation of fire detection sensor with high sensitivity and short response time is of great significance for fire prevention and monitoring. At present, the commonly used fire detection sensors mainly include CO sensor, temperature sensor and flame sensor. The sensors detect the characteristic parameters in the fire environment and converts non-electric signals such as gas, temperature, and flame light into electric signals to achieve the purpose of fire warning. With the development of material technology in recent years, especially the development of Carbon Nanotube (CNT) technology, a new fire detection sensor represented by CNT materials has emerged. In this paper, the research progress of CNTs in fire detection sensors is reviewed. The applications of CNTs in CO detection, flame light detection and temperature detection are discussed in detail. Finally, the development trend of fire detection sensors based on CNTs is proposed, and the development direction of fire detection sensors in the Internet of things is prospected.

Recent Advances on Early-Stage Fire-Warning Systems: Mechanism, Performance, and Perspective

“…Traditionally, different semiconductors have been carried out for fire detection by utilizing the characteristic of conductivity changes with temperatures. Several semiconductors, such as metal oxides (MOs) or CNT, are well known for gas sensing [86,87]. Recently, these semiconductor materials have been considered for thermosensitive early fire sensors [40,88,89].…”

“…Carbon-based allotropies, alongside GO, have also been considered for thermosensitive fire alarms due to several temperature-induced phenomena which can serve as objects to be detected, such as material volume expansion, magnetic susceptibility change, and resistance exchange. As a representative of carbon-based materials, CNT can be employed to prepare an EFWS by monitoring environmental temperature changes [86]. The chitosan/montmorillonite/CNT composite aerogel (CCA) is assembled and shown in Fig.…”

“…Several IoT-based works can be read in EFWSs [86,[118][119][120][121][122][123][124][125][126][127][128][129][130]. Sarwar et al [118] utilize the change rate of smoke and temperature the same as humidity and gases such as CO to detect the presence of fire.…”

Carbon Nanotubes and its Potential Application in Sensing

“…[187] Apart from the above-mentioned examples of CNT based sensor, continuous efforts have been put and new advancements are made to develop simple, cost-effective and reliable sensors for the recognition of different analytes present in the environment. [188][189][190][191]…”

Airflow-assisted dielectrophoresis to reduce the resistance mismatch in carbon nanotube-based temperature sensors

“…14 The high stability and low power consumption made CNTs suitable to work as temperature sensors. 15 Moreover, CNTs can operate in a wide temperature range without being physically affected. Several sensing mechanisms were reported to theoretically explain the change in the CNT resistance following the change in the ambient temperature.…”