Lee, Kwangjae Shim, Young-Seok Song, Young Geun Han, Soo Deok Lee, Youn-Sung Kang, Chong-Yun 2024-01-20T02:30:47Z 2024-01-20T02:30:47Z 2021-09-01 2017-02 1424-8220 https://pubs.kist.re.kr/handle/201004/123163 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, SnO2, WO3 and In2O3 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 degrees C), the resistances of the metal-oxide NCs are abruptly changed and SnO2 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 degrees C). The response time of SnO2 NCs is much faster than that of a commercial smoke detector at the hot-plate temperature of 350 degrees 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. English MDPI GLANCING ANGLE DEPOSITION ELECTRONIC NOSE GAS SENSOR NANOSTRUCTURES PERFORMANCE NANOTUBES TOXICITY VOLATILE SMOKE ARRAY Highly Sensitive Sensors Based on Metal-Oxide Nanocolumns for Fire Detection Article 10.3390/s17020303 1 SENSORS, v.17, no.2 SENSORS 17 2 scie scopus 000395482700087 2-s2.0-85012177420 Chemistry, Analytical Engineering, Electrical & Electronic Instruments & Instrumentation Chemistry Engineering Instruments & Instrumentation Article GLANCING ANGLE DEPOSITION ELECTRONIC NOSE GAS SENSOR NANOSTRUCTURES PERFORMANCE NANOTUBES TOXICITY VOLATILE SMOKE ARRAY fire detection gas sensor nanostructures