Intense pulsed light-based synthesis of hybrid TiO2–SnO2/MWCNT doped Cu-BTC for room temperature ammonia sensing
Date
2020-04
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Royal Society of Chemistry
Abstract
Ammonia gas is an irritating and corrosive gas commonly used as fertilizers, refrigerants and cleaners. In this work, a sensitive and selective nanocomposite film is fabricated on a quartz crystal microbalance (QCM) with hybrid TiO2-SnO2/multi-walled carbon nanotubes (MWCNTs) doped Cu-BTC for trace amount of ammonia detection under ambient conditions. Cu-BTC exhibits excellent porosity for gas sensing, but poor stability in the presence of water and ammonia which limits the long term viability. Hybrid TiO2-SnO2/MWCNTs doping prevents framework decomposition and improves longevity. The nanocomposite film is rapidly synthesized under ambient conditions using a facile intense pulsed light (IPL) technique to stimulate in-situ growth. IPL also assists in the thermal conversion of anatase TiO2 to rutile TiO2. This functionalized
nanocomposite film-based QCM sensor demonstrates ammonia gas sensing capability with a limit of detection estimated to be 0.77 ppm and strong stability even under humid conditions. The sensor exhibits reversibility during cyclic testing and minimal drift suggesting that the reaction mechanism is primarily surface adsorption. Changes in the motional resistance and resonance frequency of the sensor can be linearly related to the ammonia gas concentration.
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Citation
Wong, D., Abuzalat, O., Mostafa, S., Park, S. S., & Kim, S. (2020). Intense pulsed light-based synthesis of hybrid TiO 2–SnO 2/MWCNT doped Cu-BTC for room temperature ammonia sensing. Journal of Materials Chemistry C, 8(22), 7567-7574.