Abstract
AbstractSilicon carbide (SiC) particles are exciting structures because of their hardness, chemical inertness, and dielectric properties. In particular, their absorption/emission properties in the mid‐infrared range render them suitable structures for ambient temperature thermal emitters. However, the synthesis of uniform, spherical structures is still challenging. Here, we present a robust synthesis procedure based on carbothermal reduction of silica precursor particles. With an isotropic shrinkage of ∼30 %, the spherical particle shape and uniformity are retained. Furthermore, we outline the influence of the gas atmosphere during the carbothermal treatment and demonstrate the successful conversion to SiC by electron microscopy, X‐ray diffraction, thermal and optical analysis.
Highlights
Silicon carbide (SiC) is an advanced ceramic common in space but extremely rare on earth
The size distribution is controlled during synthesis by either the concentration of the reactants or the temperature and commonly results in colloidal silica with diameters from 50–2000 nm and small polydispersity
We found that changing the concentrations of water, PTMS, and ammonia does not influence the final particle size. (Figure 1)
Summary
Silicon carbide (SiC) is an advanced ceramic common in space but extremely rare on earth. In nature, it occurs only in negligible amounts in meteorites,[1] carborundum, or kimberlite. In 1904 he identified the crystals as silicon carbide.[2] SiC shows remarkable properties like extreme hardness, high thermal conductivity, low thermal expansion, and excellent chemical inertness. More than 250 polymorphs of silicon carbide are known, including various amorphous phases.[8] It has been shown that variations of size and shape can tune the optical and electrical properties of nanoscaled particles.
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