Effect of Ceo₂ Doping on the Structure, Electrical Conductivity and Ethanol Gas Sensing Properties of Nanocrystalline Zno Sensors

Abstract

Abstract-Nanocrystalline sensors having the general formula ZnO + x wt% CeO 2 , where x = 0, 2, 4 and 6 were prepared by chemical precipitation method and sintered at 400, 600 and 800 o C for 2h in static air atmosphere. The crystal structure and the morphology of the prepared samples were investigated and characterized by using XRD, IR, SEM and TEM techniques. The investigation revealed that the average crystallites size increases with increasing the sintering temperature. The electrical conductivity is found to increase with CeO 2 additions and sintering temperature. Gas sensing properties of the prepared samples were also investigated. The effect of CeO 2 content and sintering temperature on the structure, electrical conductivity and ethanol gas sensing properties of the prepared samples are discussed.

Prototyping a Gas Sensors Using CeO2 as a Matrix or Dopant in Oxide Semiconductor Systems

“…Many researchers obtained a band gap narrowing after heat treatment of CeO 2 [52] and doping with different metals as Co [52], Gd [53], functionalized by different techniques [47], etc. Rare earth oxides present a high basicity related to ordinary oxide semiconductors such as TiO 2 ,W O 3 , SnO 2 and ZnO, fast oxygen ion mobility and interesting catalytic properties which are important in gas sensing application [54][55][56]. Table 4 presents UV-Vis spectra parameters of UV-Vis measurements for 1%CeO 2 /1%rGO/ZnO and 1%rGO/ZnO.…”

“…UV-Vis spectra parameters of UV-Vis measurements. [55]. There is a current practice to use band gap modifiers.…”

Industrial And Enterprise Greenhouse Gas Emission Data Analysis System

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The Data Analysis System for Industrial and Enterprise Greenhouse Gas Emission

“…But the function for process establishment is not powerful enough when faced with complex industrial processes. The Carbon Accounting and Management Platform developed by Tanzuji Technology Co., Ltd. is the first management tool in China in the form of a website [14]. It can easily provide the carbon management and GHG emission calculation for most common business and industrial activities.…”