The mechanisms of sensory phenomena in binary metal-oxide nanocomposites

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• 作者：G.N. Gerasimov^aAuthor Vitae ; V.F. Gromov^aAuthor Vitae ; O.J. Ilegbusi^b ; ^{ilegbusi@ucf.edu}Author Vitae ; L.I. Trakhtenberg^a ; ^cAuthor Vitae
• 关键词：Nanostructured semiconductors ; Core-shell type nanofibers ; Electronic and chemical sensitization ; Percolation transition ; Reducing gases ; Study in operando
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：240
• 期：Complete
• 页码：613-624
• 全文大小：1677 K
• 卷排序：240

文摘

This study reviews the structure and properties of nanostructured composite conductometric sensors based on semiconducting metal oxides, and the physico-chemical processes occurring when applied for detection of ambient reducing gases. It discusses the mechanisms of electronic and chemical sensitization in composites comprised of metal oxides of different electronic and chemical properties. In particular, the relationship between the conductivity mechanisms and sensory effect is examined, considering the transfer of electrons between the oxide components of the composite semiconductor sensor. A separate section is devoted to new systems consisting of composite nanofibers of the core-shell type, the sensory characteristics of which depend on the transfer of electrons between the core and the shell in the nanofiber. It is demonstrated that by changing the nature of the components and their relative locations in such nanofibers, the sensitivity and selectivity of the sensor system can be tailored to various chemical compounds. Thus, the use of composite metal oxide systems can lead to improved efficiency and selectivity of conductometric sensors, and enable the development of sensor systems with the desired operating properties.