Gas Sensing Properties of Perovskite Decorated Graphene at Room Temperature
1
MINOS-EMaS, Universitat Rovira i Virgili, 43007 Tarragona, Spain
2
Instituto de Tecnología Química, CSIC-UPV, Universitat Politècnica de València, 46022 Valencia, Spain
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(20), 4563; https://doi.org/10.3390/s19204563
Received: 27 September 2019 / Revised: 17 October 2019 / Accepted: 18 October 2019 / Published: 20 October 2019
(This article belongs to the Special Issue Multisensor Arrays for Environmental Monitoring)
This paper explores the gas sensing properties of graphene nanolayers decorated with lead halide perovskite (CH3NH3PbBr3) nanocrystals to detect toxic gases such as ammonia (NH3) and nitrogen dioxide (NO2). A chemical-sensitive semiconductor film based on graphene has been achieved, being decorated with CH3NH3PbBr3 perovskite (MAPbBr3) nanocrystals (NCs) synthesized, and characterized by several techniques, such as field emission scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Reversible responses were obtained towards NO2 and NH3 at room temperature, demonstrating an enhanced sensitivity when the graphene is decorated by MAPbBr3 NCs. Furthermore, the effect of ambient moisture was extensively studied, showing that the use of perovskite NCs in gas sensors can become a promising alternative to other gas sensitive materials, due to the protective character of graphene, resulting from its high hydrophobicity. Besides, a gas sensing mechanism is proposed to understand the effects of MAPbBr3 sensing properties.
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Keywords:
lead halide perovskite; graphene; gas sensing; NO2 detection; NH3 detection; room temperature sensor
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MDPI and ACS Style
Casanova-Cháfer, J.; García-Aboal, R.; Atienzar, P.; Llobet, E. Gas Sensing Properties of Perovskite Decorated Graphene at Room Temperature. Sensors 2019, 19, 4563. https://doi.org/10.3390/s19204563
AMA Style
Casanova-Cháfer J, García-Aboal R, Atienzar P, Llobet E. Gas Sensing Properties of Perovskite Decorated Graphene at Room Temperature. Sensors. 2019; 19(20):4563. https://doi.org/10.3390/s19204563
Chicago/Turabian StyleCasanova-Cháfer, Juan; García-Aboal, Rocío; Atienzar, Pedro; Llobet, Eduard. 2019. "Gas Sensing Properties of Perovskite Decorated Graphene at Room Temperature" Sensors 19, no. 20: 4563. https://doi.org/10.3390/s19204563
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