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Shelf Life Study of NiO Nanowire Sensors for NO2 Detection
Navpreet Kaur,Dario Zappa,Elisabetta Comini 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.6
In this letter, conductometric sensing devices based on VLS grown NiO nanowires were presented for the detection of lowconcentrations of NO2. Moreover, the shelf life of sensing devices stored in ambient environmental conditions was testedover a period of 6 months. The VLS grown NiO nanowires were uniform in nature, covering completely the substrate surfacearea, with diameters ranging from 10 to 50 nm. The sensing devices show excellent performances, such as good stability, highresponse, outstanding selectivity toward NO2and low detection limit. The devices were tested toward different analytes suchas H2,acetone, NO2,etc. Indeed, at optimal working temperature, they show highly selective behavior towards NO2. Finally,the shelf life study reports that, due the exposure to the atmosphere, NiO nanowires exhibit a decrease in their conductivity,which enhances the response of the sensor.