Carbon Allotrope Nanomaterials Based Catalytic Micromotors

Maria-Hormigos, Roberto, Jurado-Sanchez, B., Vázquez, Luis y Escarpa, Alberto . (2016) Carbon Allotrope Nanomaterials Based Catalytic Micromotors. Chemistry of Materials 28(24): 8962-8970 (2016)

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Título Carbon Allotrope Nanomaterials Based Catalytic Micromotors
Autor(es) Maria-Hormigos, Roberto
Jurado-Sanchez, B.
Vázquez, Luis
Escarpa, Alberto
Materia(s) Ciencias
Abstract Carbon allotropes nanomaterials are explored here for the preparation of highly efficient tubular micromotors: 0D (C60 fullerene), 1D (carbon nanotubes), 2D (graphene), and 3D (carbon black, CB). The micromotors are prepared by direct electrochemical reduction or deposition of the nanomaterial into the pores of a membrane template. Subsequent electrodeposition of diverse inner catalytic layers (Pt, Pd, Ag, Au, or MnO2) allows for efficient bubble-propulsion in different media (seawater, human serum, and juice samples). Atomic-force microscopy (AFM) and scanning electron microscopy characterization reveals that the micromotors exhibit a highly rough outer surface and highly microporous inner catalytic structures. A key aspect derived from the AFM characterization is the demonstration that the rough outer surface of the micromotors can greatly affect their overall speed. To date, the literature has only focused on studying the effect of the inner catalytic layer upon their speed and performance and has underestimated the effect of the outer surface layer. The speed of carbon-based micromotors is a compromise between two opposite forces: the increased catalytic activity because of improved fuel decomposition in the inner catalytic layer, which propels their advance, and the friction of the rough outer surface with the fluid, which is opposed to it. The largest outer surface area associated with the highest surface roughness of C60 fullerene and carbon black-Pt micromotors leads to a large friction force, which results in a reduced speed of ∼180 μm/s (1% H2O2). In contrast, for carbon-nanotube-Pt based micromotors, the dominant force is the high catalytic activity of the micromotor, which allows them to reach ultrafast speeds up to 440 μm/s (1% H2O2). The new protocol opens new avenues for the universal preparation of carbon based multifunctional micromotors for a myriad of practical applications exploiting the features of carbon allotropes.
Editor(es) American Chemical Society
Fecha 2016-12-27
Formato application/pdf
Identificador bibliuned:DptoCA-FCIE-Articulos-Rmaria-0001
http://e-spacio.uned.es/fez/view/bibliuned:DptoCA-FCIE-Articulos-Rmaria-0001
DOI - identifier https://doi.org/10.1021/acs.chemmater.6b03689
ISSN - identifier e-issn: 1520-5002, issn: 0897-4756
Nombre de la revista Chemistry of Materials
Número de Volumen 28
Número de Issue 24
Página inicial 8962
Página final 8970
Publicado en la Revista Chemistry of Materials 28(24): 8962-8970 (2016)
Idioma eng
Versión de la publicación publishedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales The registered version of this article, first published in Chemistry of Materials, is available online at the publisher's website: American Chemical Society, https://doi.org/10.1021/acs.chemmater.6b03689
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Chemistry of Materials, está disponible en línea en el sitio web del editor: American Chemical Society, https://doi.org/10.1021/acs.chemmater.6b03689

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Creado: Wed, 24 Jan 2024, 00:03:06 CET