Semiconducting Metal Oxide Based Sensors for Selective Gas Pollutant Detection

Abstract

A review of some papers published in the last fifty years that focus on the semiconducting metal oxide (SMO) based sensors for the selective and sensitive detection of various environmental pollutants is presented.

A fast response & recovery H2S gas sensor based on α-Fe2O3 nanoparticles with ppb level detection limit

“…with an average size of about 50 nm. This difference can be attributed to the fact that 9 Results and discussion the annealing process provides the sufficient energy for mobility of the particles to realize recrystallization and grain growth [28].…”

“…Therefore, developing a H 2 S gas sensor with high-efficiency, low detection limit, and quick response in real-time monitoring the H 2 S concentration of the surrounding environment is urgent and significant. Introduction detecting combustion gases; whereas optical sensors have problems of high manufacturing costs, poor stability and compatibility [9]. On the contrary, metal oxide semiconductor (MOS) based gas sensors possess numerous merits including low manufacturing cost, simple synthesis process, low detection limits (< ppm level) and ease of incorporation into microelectronic devices with possible high device integration density.…”

Structural Characterization of NiO/Cr2O3Composites and Hydrothermal Synthesis, Properties Gas Sensing

“…Metal oxide gas sensors have been widely used in portable gas detection systems because of their advantages such as low cost, easy production, compact size and simple measuring electronics. However, the performance of such sensors is significantly influenced by the morphology and structure of sensing materials, resulting in a great obstacle for gas sensors based on bulk materials or dense films to achieve highly-sensitive properties [5,6]. In the present communication, we report the deposition of nanocrystalline NiO/ Cr 2 O 3 films by print screen method at low temperature and gas response properties.…”

Diseño Y Construcción De Sensores Automatizados De Gases De Efecto Invernadero en La Baja Troposfera

“…Estos sensores, que se basan en las propiedades electroquímicas o modulación de la resistencia eléctrica del material expuesto a diferentes gases, han venido tomando importancia en el monitoreo de la polución del aire [12], [13].…”