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Multiwavelength light-responsive Au/B-TiO2 Janus micromotors
Jang, Bumjin (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
Hong, Ayoung (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
KangHa, Eun Kang (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
Alcántara, Carlos (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
Charreyron, Samuel (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
Mushtaq, Fajer (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
Pellicer Vilà, Eva M. (Eva Maria) (Universitat Autònoma de Barcelona. Departament de Física)
Büchel, Robert (Eidgenössische Technische Hochschule Zürich. Departement Maschinenbau und Verfahrenstechnik)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Lee, Sung Sik (Eidgenössische Technische Hochschule Zürich. Scientific Center for Optical and Electron Microscopy)
Nelson, Bradley J. (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
Pané, Salvador (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)

Date: 2017
Abstract: Conventional photocatalytic micromotors are limited to the use of specific wavelengths of light due to their narrow light absorption spectrum, which limits their effectiveness for applications in biomedicine and environmental remediation. We present a multiwavelength light-responsive Janus micromotor consisting of a black TiO₂ microsphere asymmetrically coated with a thin Au layer. The black TiO₂ microspheres exhibit absorption ranges between 300 and 800 nm. The Janus micromotors are propelled by light, both in H₂O₂ solutions and in pure H₂O over a broad range of wavelengths including UV, blue, cyan, green, and red light. An analysis of the particles' motion shows that the motor speed decreases with increasing wavelength, which has not been previously realized. A significant increase in motor speed is observed when exploiting the entire visible light spectrum (>400 nm), suggesting a potential use of solar energy, which contains a great portion of visible light. Finally, stop-go motion is also demonstrated by controlling the visible light illumination, a necessary feature for the steerability of micro- and nanomachines.
Note: Número d'acord de subvenció EC/H2020/642642
Note: Número d'acord de subvenció EC/FP7/336456
Note: Número d'acord de subvenció MINECO/MAT2014-57960-C3-1-R
Note: Número d'acord de subvenció MINECO/RYC-2012-10839
Note: Número d'acord de subvenció AGAUR/2014/SGR-1015
Rights: Tots els drets reservats
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: Au/B-TiO2 Janus micromotors ; Black TiO2 ; Micromotors ; Multiwavelengths ; Photocatalysis
Published in: ACS nano, Vol. 11, issue 6 (June 2017) , p. 6146-6154, ISSN 1936-0851

DOI: 10.1021/acsnano.7b02177


Postprint
26 p, 1.1 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Research articles
Articles > Published articles

 Record created 2019-03-22, last modified 2020-02-08



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