Synthesis and characterization of ultralong SiC nanowires with unique optical properties, excellent thermal stability and flexible nanomechanical properties

Abstract

Several-millimeter long SiC nanowires (NWs) with unique optical properties, excellent thermal stability and flexible nanomechanical properties were synthesized using a simple method with silicon and phenolic resin as the raw materials. The SiC NWs displayed special optical properties that were attributed to their large size and Al-doping. They displayed broad green emission at 527.8 nm (2.35 eV) and purple emission concentrated at 438.9 nm (2.83 eV), in contrast to the other results, and the synthesized SiC NWs could also remain relatively stable in air up to 1000 °C indicating excellent thermal stability. The Young’s moduli of the SiC NWs with a wide range of NW diameters (215–400 nm) were measured using an in situ nanoindentation method with a hybrid scanning electron microscopy/scanning probe microscopy (SEM/SPM) system for the first time. The results suggested that the values of the Young’s modulus of the SiC NWs showed no clear size dependence, and the corresponding Young’s moduli of the SiC NWs with diameters of 215 nm, 320 nm, and 400 nm were approximately 559.1 GPa, 540.0 GPa and 576.5 GPa, respectively. These findings provide value and guidance for studying and understanding the properties of SiC nanomaterials and for expanding their possible applications.

Mechanical and Electronic Properties of Tin Carbide Nanowires

“…This behavior has been experimentally observed in SiNWs with surfaces covered with hydrogen or with a thin oxide layer . More recently, this trend has been experimentally found in SiCNWs with diameters ranging between 215 and 400 nm . It is worth mentioning that the theoretical values of Y obtained in this work for SiNWs, with diameters between 6 and 20 Å, agree with those reported by Leu et al .…”

Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

“…A closer look at the area marked A in Figure 3a is shown in the HRTEM image in Figure 3b. The presence of the lattice plane and the disordered zone is clearly visible, the distance between the planes of the selected area is about 0.25 nm in accordance with the (111) plane space of β-SiC, which is in agreement with the result of the XRD analysis [34,35]. Figure 3c depicts the SAED image of the disordered zone shown in Figure 3b, indicating an amorphous structure of carbon within the sample.…”

Nanowire‐decorated SiC foam from tissue paper and silicon powder by filter‐pressing

“…In presence of a catalyst, the SiC nanowire formation is by vapor‐liquid‐solid (VLS) mechanism. On the other hand, in the absence of a catalyst, SiC nanowire formation is by vapor‐solid (VS) mechanism . In the present case, the in situ growth of SiC nanowire is expected to be by the VS mechanism as we did not intentionally add any catalyst.…”

“…Alternatively, SiC nanowires are incorporated on the cell walls of SiC foams by a chemical infiltration method . Although metals such as iron, cobalt, and nickel are employed as catalysts, there are a number of reports on the growth of SiC nanowires without the aid of a catalyst . The present work reports the preparation of SiC foam with a porosity of ~94% from tissue paper and silicon powder through a filter‐pressing route.…”