Multiwavelength Light-Responsive Au/B-TiO <inf>2</inf> Janus Micromotors

Bumjin Jang, Ayoung Hong, Ha Eun Kang, Carlos Alcantara, Samuel Charreyron, Fajer Mushtaq, Eva Pellicer, Robert Büchel, Jordi Sort, Sung Sik Lee, Bradley J. Nelson, Salvador Pané

Research output: Contribution to journalArticleResearchpeer-review

79 Citations (Scopus)

Abstract

© 2017 American Chemical Society. 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 TiO 2 microsphere asymmetrically coated with a thin Au layer. The black TiO 2 microspheres exhibit absorption ranges between 300 and 800 nm. The Janus micromotors are propelled by light, both in H 2 O 2 solutions and in pure H 2 O 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.
Original languageEnglish
Pages (from-to)6146-6154
JournalACS Nano
Volume11
Issue number6
DOIs
Publication statusPublished - 27 Jun 2017

Keywords

  • Au/B-TiO Janus micromotors 2
  • black TiO 2
  • micromotors
  • multiwavelengths
  • photocatalysis

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