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Unraveling the Gas-Sensing Mechanisms of Lead-Free Perovskites Supported on Graphene

  • Datos identificativos

    Identificador: imarina:9287016
    Autores:
    Casanova-Chafer, JuanGarcia-Aboal, RocioAtienzar, PedroLlobet, Eduard
    Resumen:
    Lead halide perovskites have been attracting great attention due to their outstanding properties and have been utilized for a wide variety of applications. However, the high toxicity of lead promotes an urgent and necessary search for alternative nanomaterials. In this perspective, the emerging lead-free perovskites are an environmentally friendly and harmless option. The present work reports for the first time gas sensors based on lead-free perovskite nanocrystals supported on graphene, which acts as a transducing element owing to its high and efficient carrier transport properties. The use of nanocrystals enables achieving excellent sensitivity toward gas compounds and presents better properties than those of bulky perovskite thin films, owing to their quantum confinement effect and exciton binding energy. Specifically, an industrially scalable, facile, and inexpensive synthesis is proposed to support two different perovskites (Cs3CuBr5 and Cs2AgBiBr6) on graphene for effectively detecting a variety of harmful pollutants below the threshold limit values. H2 and H2S gases were detected for the first time by utilizing lead-free perovskites, and ultrasensitive detection of NO2 was also achieved at room temperature. In addition, the band-gap type, defect tolerance, and electronic surface traps at the nanocrystals were studied in detail for understanding the differences in the sensing performance observed. Finally, a comprehensive sensing mechanism is proposed.
  • Otros:

    Autor según el artículo: Casanova-Chafer, Juan; Garcia-Aboal, Rocio; Atienzar, Pedro; Llobet, Eduard
    Departamento: Enginyeria Electrònica, Elèctrica i Automàtica
    Autor/es de la URV: Casanova Chafer, Juan / Llobet Valero, Eduard
    Palabras clave: White-light emission Sensing mechanism Nanocrystal Lead-free perovskite Graphene Gas sensor sensing mechanism quantum yield photoluminescence nanocrystals nanocrystal halide graphene gas sensor
    Resumen: Lead halide perovskites have been attracting great attention due to their outstanding properties and have been utilized for a wide variety of applications. However, the high toxicity of lead promotes an urgent and necessary search for alternative nanomaterials. In this perspective, the emerging lead-free perovskites are an environmentally friendly and harmless option. The present work reports for the first time gas sensors based on lead-free perovskite nanocrystals supported on graphene, which acts as a transducing element owing to its high and efficient carrier transport properties. The use of nanocrystals enables achieving excellent sensitivity toward gas compounds and presents better properties than those of bulky perovskite thin films, owing to their quantum confinement effect and exciton binding energy. Specifically, an industrially scalable, facile, and inexpensive synthesis is proposed to support two different perovskites (Cs3CuBr5 and Cs2AgBiBr6) on graphene for effectively detecting a variety of harmful pollutants below the threshold limit values. H2 and H2S gases were detected for the first time by utilizing lead-free perovskites, and ultrasensitive detection of NO2 was also achieved at room temperature. In addition, the band-gap type, defect tolerance, and electronic surface traps at the nanocrystals were studied in detail for understanding the differences in the sensing performance observed. Finally, a comprehensive sensing mechanism is proposed.
    Áreas temáticas: Process chemistry and technology Nanoscience & nanotechnology Instrumentation Fluid flow and transfer processes Engenharias iii Chemistry, multidisciplinary Chemistry, analytical Bioengineering
    Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
    Direcció de correo del autor: juan.casanova@urv.cat eduard.llobet@urv.cat
    Identificador del autor: 0000-0001-6164-4342
    Fecha de alta del registro: 2024-10-12
    Versión del articulo depositado: info:eu-repo/semantics/publishedVersion
    Enlace a la fuente original: https://pubs.acs.org/doi/10.1021/acssensors.2c01581
    URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referencia al articulo segun fuente origial: Acs Sensors. 7 (12): 3753-3763
    Referencia de l'ítem segons les normes APA: Casanova-Chafer, Juan; Garcia-Aboal, Rocio; Atienzar, Pedro; Llobet, Eduard (2022). Unraveling the Gas-Sensing Mechanisms of Lead-Free Perovskites Supported on Graphene. Acs Sensors, 7(12), 3753-3763. DOI: 10.1021/acssensors.2c01581
    DOI del artículo: 10.1021/acssensors.2c01581
    Entidad: Universitat Rovira i Virgili
    Año de publicación de la revista: 2022
    Tipo de publicación: Journal Publications
  • Palabras clave:

    Bioengineering,Chemistry, Analytical,Chemistry, Multidisciplinary,Fluid Flow and Transfer Processes,Instrumentation,Nanoscience & Nanotechnology,Process Chemistry and Technology
    White-light emission
    Sensing mechanism
    Nanocrystal
    Lead-free perovskite
    Graphene
    Gas sensor
    sensing mechanism
    quantum yield
    photoluminescence
    nanocrystals
    nanocrystal
    halide
    graphene
    gas sensor
    Process chemistry and technology
    Nanoscience & nanotechnology
    Instrumentation
    Fluid flow and transfer processes
    Engenharias iii
    Chemistry, multidisciplinary
    Chemistry, analytical
    Bioengineering
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