Elucidating and understanding NANOparticle synthesis BY NANOsecond repetitively pulsed plasma discharges at atmospheric pressure


The portable, on-demand, and point-of-use synthesis of nanoparticles (NP) can improve the feasibility of portable applications requiring such materials. Currently, many synthesis techniques require fixed-site, complex facilities, hence prohibiting on-demand NP production at a remote location. As a result, mobile devices must store and deliver pre-made NP, which adds cost and complexity. Stored NP can agglomerate and sediment, becoming unstable. Delivery to the point of use may require transformation of the NP storage medium, which could be energetically expensive and slow the responsiveness of the device. Furthermore, certain applications may require a variety of NP properties to adapt to changing usage conditions, which would complexify on-board storage/delivery systems. There exists thus a growing need to develop a new NP synthesis paradigm that can achieve fast and efficient synthesis using a simple and compact platform capable of exerting fine control over NP properties. Plasmas can meet these challenges by producing physico-chemical conditions that are difficult to achieve otherwise. However, existing NP synthesis techniques using plasmas suffer from certain weaknesses.


NANObyNANO aims to develop a fundamental and detailed understanding of NP synthesis by plasma. Our experimental approach will feature state-of-the-art in-situ laser diagnostics of spatiotemporal NP growth, using coherent anti-Stokes Raman spectroscopy and coherent Rayleigh-Brillouin scattering, as well as optical diagnostics of plasma properties. With the detailed spatiotemporal input from these diagnostics, we will develop a theoretical model of nanoparticle formation in NRP discharges.


Ultimately, the fundamental understanding developed by NANObyNANO will enable the use of NRP discharges for the production of rationally designed NP with well-defined properties (morphology, composition) in a simple, highly energy-efficient way. The results of NANObyNANO can eventually lead to a future mobile platform for the on-demand NP synthesis directly at the point of use, eliminating the need for on-board storage/delivery systems. The process can be single-step, highly efficient in its use of energy and precursor material, and enable on-demand adjustment of NP properties.

Domaines de recherche
  • Matériaux

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 Alexandros GERAKIS
Alexandros GERAKIS
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The project is performed in collaboration with Dr. David Pai from the Laboratoire de Physique de Plasmas, Ecole Polytechnique, Paris and supported by an ANR-FNR grant.