Breaking the symmetry of micro- and nanoobjects by bipolar electrochemistry

J. Roche, G. Loget, Z. Fattah, D. Zigah, L. Bouffier, A. Kuhn
Université de Bordeaux, ISM, UMR 5255, FR

Keywords: Janus particles, disymmetric particles, functonalization

Summary:

Referring to the roman god Janus, depicted with two heads, Janus particles are defined as micro- or nano- particles owning two sides of different chemistry. They can be used as key-components in applications such as catalysis, medical therapy, detection or display technologies. So far, a great majority of methods used to produce these particles breaks the symmetry by using a surface or interface, leading only to monolayer equivalents of material. We demonstrated that it is possible to use the concept of bipolar electrochemistry to generate anisotropy on conductive particles in the bulk phase for a cost effective large-scale production. We are currently working on i) improving the efficiency of these synthesis, in order to optimize the yield, as well as on the scaling up of the approach, and ii) increasing the versatility of the process in terms of particle materials, size and shape as well as the type of deposited material (metals, polymers, semiconductors, organic layers) This communication will present an overview of the different Janus particles obtained, as well as the associated formation mechanisms.