Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 245, Issue -, Pages 375-385Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.01.136
Keywords
Core-shell nanorod; PN heterojunction; Debye length; TEA sensor; Near room-temperature
Funding
- NSFC [51472110]
- Shandong Provincial Science Foundation [JQ201214, 2014ZRB019JP]
- Ministry of Education, China [213021A]
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Metal oxide semiconductor (MOS) based gas sensors for triethylamine (TEA) are anticipated with low operating temperature, high response, and robust manufacturing process. TEA sensors with the alpha-Fe2O3@NiO or alpha-Fe2O3@CuO core-shell nanorods (NRs) heterostructure are successfully fabricated and their sensing performance is optimized by controlling the shell thickness based on Debye length. Porous alpha-Fe2O3 NRs are directly prepared on flat Al2O3 substrates by convenient hydrothermal process. The p-type shell layer is deposited by pulsed laser deposition (PLD) method, which width is controlled by changing the applied laser pulses. Due to the formation of PN heterojunction, the core-shell NR heterostructures show enhanced performances than pristine alpha-Fe2O3 NRs at near room-temperature, e.g. 40 degrees C. Moreover, such heterostructural sensor performances also exhibit a strong dependence on the shell thickness. When the p-type shell thickness is close to its Debye length (lambda(d)), the core-shell sensor of the highest response is realized. The enhanced sensing properties of this core-shell NR heterostructure toward TEA can be explained by the increase of initial resistance (R-a) due to the modulation of depletion layer through optimizing the p-type shell thickness. (C) 2017 Elsevier B.V. All rights reserved.
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