Self-Propelled Initiative Collision at Microelectrodes with Vertically Mobile Micromotors

Ziyi Guo; Yanfang Wu; Zhouzun Xie; Junming Shao; Jian Liu; Yin Yao; Joseph Wang; Yansong Shen; J Justin Gooding; Kang Liang

doi:10.1002/anie.202209747

Self-Propelled Initiative Collision at Microelectrodes with Vertically Mobile Micromotors

Angew Chem Int Ed Engl. 2022 Oct 4;61(40):e202209747. doi: 10.1002/anie.202209747. Epub 2022 Aug 25.

Authors

Ziyi Guo^{1

2}, Yanfang Wu^{2

3}, Zhouzun Xie¹, Junming Shao⁴, Jian Liu^{1

2}, Yin Yao⁵, Joseph Wang⁶, Yansong Shen¹, J Justin Gooding^{2

3}, Kang Liang^{1

2

7}

Affiliations

¹ School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
² Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW 2052, Australia.
³ School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia.
⁴ School of Materials Science and Engineering, Central South University, Changsha, 410083, China.
⁵ Electron Microscope Unit, The University of New South Wales, Sydney, NSW 2052, Australia.
⁶ Department of Nanoengineering, University of California San Diego, La Jolla, CA 92093, USA.
⁷ Graduate School of Biomedical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.

Abstract

Impact experiments enable single particle analysis for many applications. However, the effect of the trajectory of a particle to an electrode on impact signals still requires further exploration. Here, we investigate the particle impact measurements versus motion using micromotors with controllable vertical motion. With biocatalytic cascade reactions, the micromotor system utilizes buoyancy as the driving force, thus enabling more regulated interactions with the electrode. With the aid of numerical simulations, the dynamic interactions between the electrode and micromotors are categorized into four representative patterns: approaching, departing, approaching-and-departing, and departing-and-reapproaching, which correspond well with the experimentally observed impact signals. This study offers a possibility of exploring the dynamic interactions between the electrode and particles, shedding light on the design of new electrochemical sensors.

Keywords: Biocatalysis; Electrochemistry; Metal-Organic Frameworks; Micromotors; Particle Impact.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Biocatalysis
Microelectrodes*