Influence of pH on the Motion of Catalytic Janus Particles and Tubular Bubble-Propelled Micromotors

James Guo Sheng Moo, Hong Wang, Martin Pumera

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Self-propelled miniaturized machines harness the chemical potential of their environment for movement. Locomotion of chemically powered micromotors have been hugely dependent on the surroundings. The use of pH to alter the mobility of micromotors is demonstrated in this work through the manipulation of hydrogen peroxide chemistry in different acidity/alkalinity. The sequential addition of sodium hydroxide to increase the pH of the solution led to a consequent increase in activity of micromotors. Meanwhile, addition of hydrochloric acid compromised the structural integrity of the microstructures, culminating in locomotive changes. Such dramatic changes in activity and velocities of the micromotors allow the usage of this behavior for pH detection. This concept was illustrated with Janus silver micromotors and tubular bimetallic Cu/Pt micromotors. Alteration of pH serves as a useful general strategy for increasing hydrogen peroxide decomposition for enhanced oxygen-bubble propulsion in catalytic micromotors.

Original languageEnglish
Pages (from-to)355-360
Number of pages6
JournalChemistry - A European Journal
Issue number1
Publication statusPublished - 2016 Jan 4

Bibliographical note

Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry


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