Research of the interaction mechanism between HCl and semiconductor metal oxides

Tsyrkina, T. B.; Obvintseva, L. A.; Kuchaev, V. L.; Avetisov, A. K.; Penkin, S.; Sukhareva, I. P.; Dmitrieva, M. P.

doi:10.1016/j.proche.2009.07.046

Cited by 3 publications

(1 citation statement)

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“…In addition, since these gases begin to be gradually released at relatively low temperatures below 200 °C, it is possible to extinguish the fire and escape from the fire by detecting HCl, CO, and VOCs in the initial fire stage. Hence, various gas sensors, including photoelectric and ionization sensors for detecting HCl, CO, and VOCs, have been developed [ 12 , 13 , 14 , 15 , 16 ]. However, there are still problems to solve, including mass production, small size, high response and fast response time, and low detection limit.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Sensors Based on Metal-Oxide Nanocolumns for Fire Detection

Lee

Shim

Song

et al. 2017

Sensors

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Abstract:A fire detector is the most important component in a fire alarm system. Herein, we present the feasibility of a highly sensitive and rapid response gas sensor based on metal oxides as a high performance fire detector. The glancing angle deposition (GLAD) technique is used to make the highly porous structure such as nanocolumns (NCs) of various metal oxides for enhancing the gas-sensing performance. To measure the fire detection, the interface circuitry for our sensors (NiO, SnO 2 , WO 3 and In 2 O 3 NCs) is designed. When all the sensors with various metal-oxide NCs are exposed to fire environment, they entirely react with the target gases emitted from Poly(vinyl chlorides) (PVC) decomposed at high temperature. Before the emission of smoke from the PVC (a hot-plate temperature of 200 • C), the resistances of the metal-oxide NCs are abruptly changed and SnO 2 NCs show the highest response of 2.1. However, a commercial smoke detector did not inform any warning. Interestingly, although the NiO NCs are a p-type semiconductor, they show the highest response of 577.1 after the emission of smoke from the PVC (a hot-plate temperature of 350 • C). The response time of SnO 2 NCs is much faster than that of a commercial smoke detector at the hot-plate temperature of 350 • C. In addition, we investigated the selectivity of our sensors by analyzing the responses of all sensors. Our results show the high potential of a gas sensor based on metal-oxide NCs for early fire detection.

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Section: Introductionmentioning

confidence: 99%