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Size‐Independent and Ultrahigh CO Gas Sensor Based on TiO 2 Modified ZnO Tetrapods
Author(s) -
Santhaveesuk Theerapong,
Shimanoe Kengo,
Suematsu Koichi,
Choopun Supab
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700784
Subject(s) - materials science , crystallinity , microstructure , chemical engineering , nanoparticle , nanotechnology , composite material , engineering
ZnO tetrapods modified by TiO 2 powder are synthesized using a simple fast thermal oxidation method, and theirs CO sensing properties are investigated. The ZnO tetrapods modified by TiO 2 powder sensor is tested at 250–400 °C under different CO concentrations compared with pure ZnO tetrapods, ZnO nanoparticle, and ZnO powder sensors. With a good crystallinity and a high pore size, the ZnO tetrapods modified by TiO 2 powder sensor shows the highest sensing response compared to other sensors, exhibiting a size‐independent property for CO. Additionally, the response time of ZnO tetrapods modified by TiO 2 powder sensor is reduced. The improvement of the sensing properties is attributed to microstructure, lattice, surface area, and conductance modification of TiO 2 additive together with a high diffusion process deeply inside the sensing layer through the large pore size.