Vladimir Pimonov

Workshop on Computer Vision for Image Segmentation

Vladimir Pimonov

Practical Workflow for Microscopy Image Segmentation: Data Preparation, Model Training, Inference, and Pretrained Models Author: Vladimir Pimonov, PhDAffiliation: team PNEC / ILM This Zenodo repository contains the full practical workflow for image segmentation with deep learning, developed on transmission electron microscopy (TEM) …

fr, us (code pays fourni par la source)

Workshop on Computer Vision for Image Segmentation

Vladimir Pimonov

Practical Workflow for Microscopy Image Segmentation: Data Preparation, Model Training, Inference, and Pretrained Models Author: Vladimir Pimonov, PhDAffiliation: team PNEC / ILM This Zenodo repository contains the full practical workflow for image segmentation with deep learning, developed on transmission electron microscopy (TEM) …

fr, us (code pays fourni par la source)

Workshop on Computer Vision for Image Segmentation

Vladimir Pimonov

Practical Workflow for Microscopy Image Segmentation: Data Preparation, Model Training, Inference, and Pretrained Models Author: Vladimir Pimonov, PhDAffiliation: team PNEC / ILM This Zenodo repository contains the full practical workflow for image segmentation with deep learning, developed on transmission electron microscopy (TEM) …

fr, us (code pays fourni par la source)

Interplay of Substrate Adhesion, Axial Strain and Doping in the Raman Response of Metallic Carbon Nanotubes Grown on Quartz Monocrystal

Vladimir Pimonov, Eira Anais Zamudio Medina, Huy Tran, Saïd Tahir et autres

Single-walled carbon nanotubes (SWCNTs) grown on single-crystal quartz exhibit complex Raman features that reflect interactions between the nanotube, substrate, and environment. Here, we combine Raman spectroscopy and DFT calculations to study individual metallic SWCNTs on quartz. As often observed but previously unexplained, …

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Deep-learning recognition and tracking of individual nanotubes in low-contrast microscopy videos

Vladimir Pimonov, Saïd Tahir, Vincent Jourdain

This study addresses the challenge of analyzing the growth kinetics of carbon nanotubes using in situ homodyne polarization microscopy (HPM) by developing an automated deep learning (DL) approach. A Mask-RCNN architecture, enhanced with a ResNet-FPN backbone, was employed to recognize and track …

fr (code pays fourni par la source)

Electric fields, forces, and modification of the tunnel barrier during field electron emission and field evaporation from single-wall carbon nanotubes

Vladimir Pimonov, Federico Panciera, Goulven Rouillé, Catherine Weng et autres

In this paper, we theoretically and experimentally investigate the specificities of single-walled carbon nanotubes (SWNTs) for field electron emission (FE) and field ion evaporation (FI). For FE, the small radii of curvature of these nanotubes lead to a significant widening of the …

fr, au (code pays fourni par la source)

Deep-learning recognition and tracking of individual nanotubes in low-contrast microscopy videos

Vladimir Pimonov, Saïd Tahir, Vincent Jourdain

This study addresses the challenge of analyzing the growth kinetics of carbon nanotubes using in-situ homodyne polarization microscopy (HPM) by developing an automated deep learning (DL) approach. A Mask-RCNN architecture, enhanced with a ResNet-50 backbone, was employed to recognize and track individual …

fr (code pays fourni par la source)

(Invited) Sulfur Addition Reaction Onto Carbon Nanotubes

Vladimir Pimonov, Simon Sprocq, Elie Haddad, Alain Rochefort et autres

The surface chemistry of carbon nanotubes is of interest for material’s processing and modification of their electronic and optical properties. Here, we present a new sulfur addition reaction to single-wall and multi-wall carbon nanotubes. Depending on the reaction conditions, we find strong …

(Invited) Reaction of Elemental Sulfur at the Surfaces of Carbon Nanotubes and Graphene

Richard Martel, Simon Sprocq, Elie Haddad, Léonard Schué et autres

The chemical functionalization of nanocarbons is key for ensuring their processability in solution and to derive new surface functionalities for applications. For this respect, the oxidation reactions of graphene and carbon nanotubes by strong oxidants is nowadays among the most significant to …

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Electronic and Vibrational Properties of Episulfide-Graphene Materials

Elie Haddad, Simon Sprocq, Léonard Schué, Vladimir Pimonov et autres

Our group has investigated the stability of sulfur adatoms on graphene obtained by a direct reaction of highly oriented pyrolytic graphite (HOPG) with elemental sulfur. With the help of density functional theory (DFT) calculations, we have developed different models of the structure …

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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 …

fr (code pays fourni par la source)

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 …