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Layered Black Phosphorus as a Selective Vapor Sensor
Author(s) -
MayorgaMartinez Carmen C.,
Sofer Zdeněk,
Pumera Martin
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201505015
Subject(s) - detection limit , methanol , dielectric spectroscopy , black phosphorus , graphite , carbon black , analytical chemistry (journal) , electrical impedance , vapor phase , phosphorus , chemistry , materials science , water vapor , inorganic chemistry , electrochemistry , optoelectronics , chromatography , organic chemistry , thermodynamics , electrode , natural rubber , physics , electrical engineering , engineering
Black phosphorus is a layered material that is sensitive to the surrounding atmosphere. This is generally considered as a disadvantage, especially when compared to more stable layered compounds, such as graphite or MoS 2 . This sensitivity is now turned into an advantage. A vapor sensor that is based on layered black phosphorus and uses electrochemical impedance spectroscopy as the detection method is presented; the device selectively detects methanol vapor. The impedance phase measured at a constant frequency is used as a distinctive parameter for the selective quantification of methanol, and increases with the methanol concentration. The low detection limit of 28 ppm is well below the approved exposure limit of 200 ppm. The results are highly reproducible, and the vapor sensor is shown to be very selective in the presence of other vapors and to have long‐term stability.