Fabrication and operating characteristics of Distribution board fire sensor using Indium-Tin-Oxide nanaopowder

Abstract

Indium-Tin-Oxide (ITO) is a transparent metal oxide material which is excellent in chemical durability. In this study, we investigated the fabrication and operation characteristics of a sensor that can detect changes in temperature, flash,and humidity, which are important factors related to switchboard fire occurrence, using ITO. The ITO nanopowder utilizes an Sn concentration of 10% and an average particle size of 45 nm, and the printing is printed on various substrates such as PCB, PET, quartz, etc. to facilitate application of the sensor. The printing paste used a cellulose-based binder, and the paste mixing ratio and the heat treatment process for removing the binder were optimized for each substrate. Also, the printing process measures printing accuracy and electrical characteristics to optimize the printing process. To reproduce the arc light for confirming the arc light detection performance, an Hg lamp having a maximum emission peak at254 nm was used, and the resistance change of the sensor with respect to the temperature change was measured on the Hot chuck. The ITO thin film printed on each substrate showed a resistivity of 27.75 Ω · cm on average. The transfer rate of printing was confirmed to be 95% or more. Moreover, as for the sensitivity characteristic of the sensor using ITO nanopowder, the sensor using ITO manufactured by the sputtering method showed a characteristic with higher sensitivity. Mo