Christophe Bichara

(Invited) Structures of Iron and Cobalt Bimetallic Clusters for CVD Growth of Single-Walled Carbon Nanotubes

Shigeo Maruyama, Qingmei Hu, Daniel Hedman, Yongjia Zheng et autres

Metal catalysts play a critical role in the growth of single-walled carbon nanotubes (SWCNTs). Bimetallic catalysts have been often employed for efficient growth or chirality-selective growth. Iron (Fe) and cobalt (Co) alloys are often resulting in efficient growth. We reported a classical …

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Pressure and temperature diagram of C60 from atomistic simulations

K. N. A. Hakim, Romain Dupuis, Christophe Bichara, Roland J.‐M. Pellenq

Although widely studied experimentally in the 1990s, the structure and properties of low-dimensional or high-pressure phases of fullerenes have recently been re-examined. Remarkably, recent experiments have shown that transparent, nearly pure amorphous sp3-bonded carbon phases can be obtained by heating a C60 …

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Reply to Lee and Elliott: Changes of bonding upon crystallization in phase change materials

Jean‐Yves Raty, Christophe Bichara, Carl‐Friedrich Schön, Carlo Gatti et autres

International audience

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Tailoring chemical bonds to design unconventional glasses

Jean‐Yves Raty, Christophe Bichara, Carl‐Friedrich Schön, Carlo Gatti et autres

Glasses are commonly described as disordered counterparts of the corresponding crystals; both usually share the same short-range order, but glasses lack long-range order. Here, a quantification of chemical bonding in a series of glasses and their corresponding crystals is performed, employing two …

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Structural characterization of single wall carbon nanotubes via AI assisted transmission electron microscopy

Antonin Louiset, Georg Daniel Förster, Saïd Tahir, Vincent Jourdain et autres

protocol offers the possibility to track down defects and eventual chirality changes induced during growth.However, residual polymer contamination from the transfer processes prevented the analysis of all tubes across their entire length.Nevertheless, we were able to follow single chirality tubes across 10s …

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Towards direct imaging of defects in carbon nanotubes with 4DSTEM

Antonin Louiset, Georg Daniel Förster, Jean‐Luc Rouvière, Vincent Jourdain et autres

International audience

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La danse des bords de nanotubes de carbone en croissance

Christophe Bichara

International audience

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Swinging Crystal Edge of Growing Carbon Nanotubes

Georg Daniel Förster, Vladimir Pimonov, Huy‐Nam Tran, Saïd Tahir et autres

Recent direct measurements of the growth kinetics of individual carbon nanotubes revealed abrupt changes in the growth rate of nanotubes maintaining the same crystal structure. These stochastic switches call into question the possibility of chirality selection based on growth kinetics. Here, we …

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Swinging Crystal Edge of Growing Carbon Nanotubes

Georg Daniel Förster, Vladimir Pimonov, Huy‐Nam Tran, Saïd Tahir et autres

Recent direct measurements of the growth kinetics of individual carbon nanotubes revealed abrupt changes in the growth rate of nanotubes maintaining the same crystal structure. These stochastic switches call into question the possibility of chirality selection based on growth kinetics. Here, we …

Dynamics of growing carbon nanotube interfaces probed by machine learning-enabled molecular simulations

Daniel Hedman, Ben McLean, Christophe Bichara, Shigeo Maruyama et autres

Carbon nanotubes (CNTs) are currently considered a successor to silicon in future nanoelectronic devices. To realize this, controlled growth of defect-free nanotubes is required. Until now, the understanding of atomic-scale CNT growth mechanisms provided by molecular dynamics simulations has been hampered by …

Interfaces oscillantes de nanotubes de carbone en croissance

Christophe Bichara

International audience

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Dynamic instability of individual carbon nanotube growth revealed by in situ homodyne polarization microscopy

Vladimir Pimonov, Huy‐Nam Tran, Léonard Monniello, Saïd Tahir et autres

Understanding the kinetic selectivity of carbon nanotube growth at the scale of individual nanotubes is essential for the development of high chiral selectivity growth methods. Here we demonstrate that homodyne polarization microscopy can be used for high-throughput imaging of long individual carbon …

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