CIBAKA-NDAYA, Cynthia; O'CONNOR, Kevin; IDOWU, Emmanuel; PARKER, Megan; LEBRAUD, Éric; LACOMME, Sabrina; MONTERO, David; SANZ CAMACHO, Paula; VEINOT, Jonathan; ROIBAN, Ioan-Lucian; DRISKO, Glenna

doi:10.1021/acs.chemmater.3c01448

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CIBAKA-NDAYA, Cynthia
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

O'CONNOR, Kevin
University of Alberta

IDOWU, Emmanuel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

Chemistry of Materials. 2023, vol. 35, n° 20, p. 8551–8560

American Chemical Society

Résumé en anglais

Crystalline silicon particles sustaining Mie resonances are readily obtained from the thermal processing of hydrogen silsesquioxane (HSQ). Here, the mechanisms involved in silicon particle formation and growth from HSQ are investigated through real time in situ analysis in an environmental transmission electron microscope and X-ray diffractometer. The nucleation of Si nanodomains are observed starting around 1000 °C. For the first time, a highly mobile intermediate phase is experimentally observed, thus demonstrating a previously unknown growth mechanism. At least two growth processes occur simultaneously: the coalescence of small particles into larger particles and a growth mode by particle displacement through the matrix toward the HSQ grain surface. Post-synthetic characterization by scanning electron microscopy further evidences the latter growth mechanism. The gaseous environment employed during synthesis impacts particle formation and growth under both in situ and ex situ conditions, impacting particle yield and structural homogeneity. Understanding the formation mechanisms of particles provides promising pathways for reducing the energy cost of this synthetic route.< Réduire

Mots clés en anglais

Crystallization

Metal oxide nanoparticles

Nanoparticles

Semiconducting nanostructured materials

Silicon

DOI

http://dx.doi.org/10.1021/acs.chemmater.3c01448

Projet Européen

Bottom-up fabrication of nanostructured silicon-based materials with unprecedented optical properties

Project ANR

Développement d'une infrastructure française distribuée coordonnée

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026