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Laser-Deposited Carbon Aerogel Derived from Graphene Oxide Enables NO2-Selective Parts-per-Billion Sensing
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    Laser-Deposited Carbon Aerogel Derived from Graphene Oxide Enables NO2-Selective Parts-per-Billion Sensing
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2020, 12, 35, 39541–39548
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    https://doi.org/10.1021/acsami.0c09112
    Published July 22, 2020
    Copyright © 2020 American Chemical Society

    Abstract

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    Laser-deposited carbon aerogel is a low-density porous network of carbon clusters synthesized using a laser process. A one-step synthesis, involving deposition and annealing, results in the formation of a thin porous conductive film which can be applied as a chemiresistor. This material is sensitive to NO2 compared to ammonia and other volatile organic compounds and is able to detect ultra-low concentrations down to at least 10 parts-per-billion. The sensing mechanism, based on the solubility of NO2 in the water layer adsorbed on the aerogel, increases the usability of the sensor in practically relevant ambient environments. A heating step, achieved in tandem with a microheater, allows the recovery to the baseline, making it operable in real world environments. This, in combination with its low cost and scalable production, makes it promising for Internet-of-Things air quality monitoring.

    Copyright © 2020 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.0c09112.

    • SEM image; characterization of synthesized GO flakes; Raman spectrum; XPS spectra; C/O ratio GO, aerogel diffusion barrier, and aerogel active layer; C1-peak, % O1-peak %, content deconvolution of GO % content, an aerogel diffusion barrier and an aerogel active layer; gas measurement chamber; detailed fabrication schematic; delta and psi; and SEM and TEM images (PDF)

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    This article is cited by 8 publications.

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2020, 12, 35, 39541–39548
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.0c09112
    Published July 22, 2020
    Copyright © 2020 American Chemical Society

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