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.
Highlights
SiC NWs, as one of the most promising nanoscale building blocks, have attracted increasing interest due to their superior mechanical properties[1], high temperature oxidation resistance[2], excellent chemical stability[3], low thermal expansion coefficients[4], high thermal conductivity[5], and large band gap[5], which enables their applications in composite reinforcements[6, 7], nanodevices and optoelectronics[1, 3]
Perisanu et al measured the mechanical properties of different diameters of SiC NWs that ranged from 17.5 to 143 nm, as measured by SEM and the field emission (FE) from the mechanical resonances of single-clamped NWs, and the Young’s moduli ranged from 230 to 750 GPa19
It was reasonable to believe that this simple method might be an effective way to prepare ultralong SiC NWs
Summary
SiC NWs, as one of the most promising nanoscale building blocks, have attracted increasing interest due to their superior mechanical properties[1], high temperature oxidation resistance[2], excellent chemical stability[3], low thermal expansion coefficients[4], high thermal conductivity[5], and large band gap[5], which enables their applications in composite reinforcements[6, 7], nanodevices and optoelectronics[1, 3]. An accurate method for measuring the mechanical properties of SiC NWs is of critical importance before integrating them into functional composites and nanodevices since mechanical failure may result in the failure or malfunction of the composites and nanodevices[9, 10]. Perisanu et al measured the mechanical properties of different diameters of SiC NWs that ranged from 17.5 to 143 nm, as measured by SEM and the field emission (FE) from the mechanical resonances of single-clamped NWs, and the Young’s moduli ranged from 230 to 750 GPa19. The Young’s moduli of SiC NWs calculated from nanoindentation measurements have not been reported until now, according to our survey. The mechanical properties of the SiC NWs with different diameters were measured via in situ nanoindentation tests conducted with a hybrid SEM/SPM system, for the first time, to further explore their potential applications. The experimental data cover a wide range of NW diameters (215–400 nm) used in this research field, to our best knowledge, and we expect that the evaluated NW mechanical properties will be valuable for a better understanding of NW mechanics
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