Recent progress in synthesis, growth mechanisms, and electromagnetic wave absorption properties of silicon carbide nanowires

High-Yield Synthesis of SiC@SiO2 Core–Shell Nanowires on Graphite Substrates for Energy Applications

“…In addition, SiC@SiO 2 NWs can be prepared using SiC as a substrate . For example, Qu et al prepared SiC@SiO 2 NWs by oxidizing SiC NWs in air at high temperatures (900–1200 °C) and found that SiC@SiO 2 NWs showed better thermal insulation properties than SiC NWs .…”

“…20,21 In addition, SiC@SiO 2 NWs can be prepared using SiC as a substrate. 18 For example, Qu et al prepared SiC@SiO 2 NWs by oxidizing SiC NWs in air at high temperatures (900−1200 °C) and found that SiC@SiO 2 NWs showed better thermal insulation properties than SiC NWs. 22 Lu et al prepared SiC@ SiO 2 NWs networks by CVD and subsequent heat treatment at 1200 °C, which have potential for engineering applications in harsh environments owing to their lightweight (360 ± 10 mg cm −3 ), high mechanical strength (compressive strength of 16 MPa), and damage resistance.…”

“…29 Furthermore, Si source can be derived from various materials, either individually or in combination, such as photovoltaic waste, quartz sand, SiO 2 powders, and rice husk ash. 18,30,31 Among these Si-based materials, the amorphous SiO 2 stands out as an ideal choice due to its high reactivity, cost-effectiveness, and favorable safety characteristics. 30,31 Liu et al reported that the amorphous SiO 2 could significantly reduce the activation energy required for the reaction during the growth of NWs.…”

“…Chen et al used Ni as a catalyst to prepare SiC@SiO 2 NWs with high color purity of violet light . The utilization of metal catalysts (such as Co, Ni, Fe, and Cr) may have adverse effects on the purity and application potential of the synthesized materials in various fields. , In a typical preparation of SiC@SiO 2 NWs, C and Si sources are commonly mixed homogeneously and subjected to high temperatures, which leads to destruction of the SiO 2 layer during the subsequent purification process and affects the physical/chemical properties. , …”

“…Shen et al used SiO 2 gels as Si source to prepare various morphologies of SiC NWs, such as hierarchical, bamboo-like, beaded-like, and core–shell structure with SiC core and SiO 2 shell . Furthermore, Si source can be derived from various materials, either individually or in combination, such as photovoltaic waste, quartz sand, SiO 2 powders, and rice husk ash. ,, Among these Si-based materials, the amorphous SiO 2 stands out as an ideal choice due to its high reactivity, cost-effectiveness, and favorable safety characteristics. , Liu et al reported that the amorphous SiO 2 could significantly reduce the activation energy required for the reaction during the growth of NWs . In our previous study, Si powders with a highly chemically active SiO 2 coating on the surface (denoted as Si@SiO 2 ) were first prepared by preoxidation, and then a significant quantity of high purity (>95%) SiC@SiO 2 NWs were synthesized on graphite substrates, with the products showing good photoluminescence (PL) properties .…”