VOC Detections by p-Type Semiconducting Sensors Using Nano-Sized SmFeO3 Particles

Nano-sized SmFeO3 particles are prepared by the pyrolysis of heteronuclear cyano-complex, Sm[Fe(CN)(6)]center dot 4H(2)O at a temperature of 600 degrees C in ozone. The low temperature decomposition followed in ozone successfully yielded fine particles with a high specific surface area of 20.0 m(3)/g (sample A). The fine particles were classified into further smaller particles with a unimodal size distribution and this process yielded a high specific surface area of 26.0 m(3)/g (sample B). These semiconducting powders were deposited on a sensor electrode by electrophoretic deposition (EPD) and tested on their sensing properties to VOCs. The sensors consisting of samples A and B both showed good responses to ethanol at 285 and 320 degrees C. The sensor with sample B showed extraordinarily good selectivity of ethanol for toluene at 320 degrees C. This could be because the detection film of sample B with moderately grown particles selectively reduced the reaction activity of toluene. The sensor with sample B also exhibited good selectivity of ethanol for hexane and dichloromethane.

Automated summary

Nano-sized SmFeO3 particles were prepared by the pyrolysis of heteronuclear cyano-complex, Sm[Fe(CN)(6)]center dot 4H(2)O at a temperature of 600 degrees C in ozone. These particles were further classified into smaller particles, showing good ethanol sensing response and selectivity.