Electron Precise Sodium Carbaboride Nanocrystals from Molten Salts: Single Sources to Boron Carbides - Sorbonne Université Access content directly
Journal Articles Inorganic Chemistry Year : 2021

Electron Precise Sodium Carbaboride Nanocrystals from Molten Salts: Single Sources to Boron Carbides

Abstract

Boron-rich solids exhibit specific crystal structures and unique properties, which are only very scarcely addressed in nanoparticles. In this work, we address the original inorganic structural chemistry and reactivity of boron-rich nanoparticles, by reporting the first occurrence of sodium carbaboride nanocrystals based on the NaB 5 C crystal structure. To design these sub-10 nm nano-objects, we use liquid-phase synthesis in molten salts at 900°C. By combining a set of characterization tools including powder Xray powder diffraction, transmission electron microscopy, solid-state nuclear magnetic resonance coupled to DFT modeling, and X-ray photoelectron spectroscopy, we demonstrate that these nanocrystals deviate from the ideal stoichiometry reported for the bulk compound. We suggest that the carbon and sodium contents compensate each other to ensure that the octahedral cluster-based framework is stabilized by fulfilling an electron counting rule. These nanocrystals encompass substituted octahedral covalent structural building units not reported in the related bulk compound. They then shed new light on the ability of nanoparticles to host wide solid solution ranges in covalent solids and then to yield new solids. We finally show that these nanocrystals are efficient single sources of boron and carbon to form a nanostructured boron carbide, thus paving the way to new nanostructured materials.
Fichier principal
Vignette du fichier
2020-NaB5C InorgChem-hal.pdf (6.32 Mo) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-03145234 , version 1 (16-11-2021)

Identifiers

Cite

Simon Delacroix, Fernando Igoa, Yang Song, Yann Le Godec, Cristina Coelho-Diogo, et al.. Electron Precise Sodium Carbaboride Nanocrystals from Molten Salts: Single Sources to Boron Carbides. Inorganic Chemistry, 2021, The Inorganic Chemistry of Nanoparticles, 60 (7), pp.4252-4260. ⟨10.1021/acs.inorgchem.0c03501⟩. ⟨hal-03145234⟩
279 View
105 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More