Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 255, Issue -, Pages 2538-2545Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.09.059
Keywords
ZnO; PbS quantum dots; Room-temperature NO2 sensor; Near infrared light
Funding
- National Science Foundation of China [51234003, 51374138]
- National Key Technology Research and Development Program of China [2013BAC14B02]
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Here we report the near infrared light (NIR) activated room-temperature NO2 gas sensors based on ZnO/PbS nanocomposites. The nanocomposites were composed of PbS quantum dots (QDs)-decorated ZnO nanorods with an urchin-like hierarchical mesoporous structure. The nanocomposites showed NIR adsorption derived from the PbS QDs with a narrow band gap. Compared to the pristine ZnO nanorods, the ZnO/PbS nanocomposites-based sensor with the optimal loading amount of PbS exhibited higher response and quicker response/recovery rates to parts per million (ppm) level of NO2 at room temperature under NIR illumination. Moreover, the sensor exhibited full reversibility, low detection limit, good selectivity and long-term stability to NO2. Photoluminescence and I-V characterization revealed the electron transfer from the excited PbS QDs to ZnO nanorods under NIR illumination, which enhanced the radial modulation of the conduction channel of ZnO nanorods, leading to the improved NO2 sensing performances of the ZnO/PbS nanocomposites at room temperature. (C) 2017 Published by Elsevier B.V.
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