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- W2579888130 abstract "Abstract This paper deals with chemoresistive behavior of hexagonal YMnO 3 produced by gel combustion. Stoichiometric, defective and doped compositions were studied and both reducing (CO) and oxidizing test gases (NO x ) were used. The materials were characterized by means of X-ray diffraction, CO conversion tests, and oxygen temperature programmable desorption (TPD) and temperature programmable reduction (TPR) with H 2 . Experiments indicate that, besides the oxygen chemisorption, the direct adsorption of the target gases at the material surface plays an important role in resistive gas sensing. A model based on these assumptions was developed and excellently fits the transient response of the sensors under test to NO 2 in the absence of oxygen. All the tested materials behave as p-type semiconductors and have a fast reversible response to NO 2 which is optimum at temperatures close to 180 °C (30% @10 ppm NO 2 , after about 1 min). In particular, it was found that the best sensor performance in NO 2 detection is obtained with defective materials in terms of response, while an interesting trade-off between temperature response and gas response is obtained with Pd doped materials. Regarding CO detection, materials impregnated with Pd showed the best performance both in terms of speed and of response, with an optimum temperature of 300 °C." @default.
- W2579888130 created "2017-01-26" @default.
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- W2579888130 date "2017-06-01" @default.
- W2579888130 modified "2023-09-30" @default.
- W2579888130 title "Gas sensing properties of YMnO3 based materials for the detection of NOx and CO" @default.
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- W2579888130 doi "https://doi.org/10.1016/j.snb.2017.01.054" @default.
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