The proposed internship topic is part of a cooperative project on the development of new catalysts (metal or bimetallic nanoparticles) for the growth of carbon nanotubes, aiming at controlling their electronic properties during their synthesis.
The nanoparticles as catalysts will be synthesized, in collaboration with the partnering group of Pr V. Huc at the Institute of Molecular Chemistry and Orsay Materials (ICCMO) by combining surface chemistry and coordination chemistry. We propose to compare the same set of metallic or bimetallic nanoparticles synthesized using very different synthetic pathways and then we will compare the catalytic action of these nanoparticles in the growth of nanotubes.
We will focus on the Ni-Ru catalytic system, identified as a good candidate for achieving the desired electronic character selectivity.
– A first part of the experimental work will be to synthesize the nanoparticles using soft chemistry via the colloidal route (optimization of the synthesis by first reducing the Ru3 + in Ru2 + and then combining it with Ni) and Prussian Blue Analogues at ICMMO. The latter will be calcined under argon in order to obtain carbureted species. We will do the structural study (size distribution, composition, crystalline structure) at LEM. For the latter, we will use a powerful set of investigation techniques (high-resolution transmission electron microscopy, diffraction, energy loss spectroscopy and X-ray spectroscopy) present in the laboratory (LEM).
– A second part of the experimental work will be to grow carbon nanotubes by CVD using the nanoparticles developed as a catalyst (colloidal, by “Prussian blue” and Prussian blue “carbides”) and to characterize their structures (chirality, length, type of adhesion to the nanoparticle) by TEM (imaging and diffraction) and Raman spectroscopy. These three sets of catalysts should be compared to observe the influence of the synthesis route and the influence of the carburized phase on the growth of carbon nanotubes.
Job: Internship (4-6 months)
Academic level : Master degree
Location: LEM, Châtillon
Expertise: Good training in condensed matter physics and chemistry with a major focus on nanoscience and courses on synthesis and characterization.
Strong interest for experiments