Publication detail

Tailoring Metal/TiO2 Interface to Influence Motion of Light-Activated Janus Micromotors

MARIC, T. NASIR, M. WEBSTER, R. PUMERA, M.

Original Title

Tailoring Metal/TiO2 Interface to Influence Motion of Light-Activated Janus Micromotors

Type

journal article in Web of Science

Language

English

Original Abstract

Catalytic light-powered micromotors have become a major focus in current autonomous self-propelled micromotors research. The attractiveness of such machines stems from the fact that these motors are "fuel-free," with their motion modulated by light irradiation. In order to study how different metals affect the velocities of metal/TiO2 micromachines in the presence of UV irradiation in pure water, Pt/TiO2, Cu/TiO2, Fe/TiO2, Ag/TiO2, and Au/TiO2 Janus micromotors are prepared. The metals have different chemical potentials and catalytic effects toward water splitting reaction, with both the effects expected to alter the photoelectrochemically-induced reaction and propulsion rates. Analysis of structures, elemental compositions, motion patterns, velocities, and overall performances of different metals (Pt, Au, Ag, Fe, Cu) on TiO2 are observed by scanning electron microscopy, energy dispersive X-ray spectroscopy, and optical microscopy. Electrochemical Tafel analysis is performed for the different metal/TiO2 structures and it is concluded that the effective velocity is a result of the synergistic effect of chemical potential and catalysis. It is found that the Pt/TiO2 Janus micromotors exhibit the fastest motion compared to the rest of the prepared materials. Furthermore, after exposure to UV light, every fabricated micromotor shows high possibility of forming assembled chains which influence their velocity.

Keywords

micromotors; self-electrophoresis; sputtering; TiO2; UV irradiation

Authors

MARIC, T.; NASIR, M.; WEBSTER, R.; PUMERA, M.

Released

1. 2. 2020

Publisher

WILEY-V C H VERLAG GMBH

Location

WEINHEIM

ISBN

1616-301X

Periodical

ADVANCED FUNCTIONAL MATERIALS

Year of study

30

Number

9

State

Federal Republic of Germany

Pages from

1

Pages to

6

Pages count

6

URL

https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201908614

BibTex

@article{BUT163850,
  author="Tijana {Maric} and Muhammad Zafir Mohamad {Nasir} and Richard D. {Webster} and Martin {Pumera}",
  title="Tailoring Metal/TiO2 Interface to Influence Motion of Light-Activated Janus Micromotors",
  journal="ADVANCED FUNCTIONAL MATERIALS",
  year="2020",
  volume="30",
  number="9",
  pages="1--6",
  doi="10.1002/adfm.201908614",
  issn="1616-301X",
  url="https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201908614"
}