Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 219, Issue -, Pages 158-163Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.05.031
Keywords
Hollow TiO(2)microspheres; Room-temperature chemoresistive gas sensors; Formaldehyde; UV illumination
Funding
- National Natural Science Foundation of China [61474012, 61306091, 61176068, 61131004]
- Hainan Key Projects in Science and Technology [ZDXM2014097]
- Fundamental Research Funds for the Central Universities
- Foundation of Key Lab. for Micro/Nano Technology and System of Liaoning Province [20140404]
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Room temperature chemoresistive gas sensors could significantly decrease the demand of power consumption and are thus highly desirable in self-sustained nanosensors. Here we report that chemoresistive sensors fabricated from mesoporous hollow TiO2 microspheres show high sensitivity and selectivity to sub-ppm level of formaldehyde at room temperature with the assistance of low powered UV LED photon energy (2.5 mW). The sensor indicated excellent selectivity to other possible interferrents such as methanol, ethanol, acetone, ammonia and methylbenzene at low concentrations. These sensors have a much faster response (similar to 40 s)/recovery (similar to 50 s) characteristic, which significantly surpass the sensing properties shown by other types of nanostructured TiO2 reported in literature. (C) 2015 Elsevier B.V. All rights reserved.
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