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- W2808879757 abstract "Granular thin films of p-type semiconducting PbS (Cubic) with predominantly a-axis oriented grains having an average grain size of about 300 nm were deposited on polycrystalline alumina by pulsed laser deposition technique. Optical measurements show a band gap of 2.25 eV. The thin films were highly selective to ammonia at 473 K even in the presence of hydrogen and they operate in inert ambient with a typical response and recovery times of about 25 s and 120 s respectively. In-situ Hall measurements show an exponential decrease in hole carrier concentration with increasing NH3 level. XPS analysis of Pb 4f and S 2p levels reveals that the valence state of Pb and Sulphur remain in +2 and −2 respectively after exposure to the reducing ammonia and the appearance of N 1s peak at 398.1 eV confirms dissociative chemisorption of ammonia on PbS surface." @default.
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- W2808879757 date "2018-10-01" @default.
- W2808879757 modified "2023-09-27" @default.
- W2808879757 title "Highly selective PbS thin film based ammonia sensor for inert ambient: In-situ Hall and photoelectron studies" @default.
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- W2808879757 doi "https://doi.org/10.1016/j.apsusc.2018.06.145" @default.
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