Young's Modulus and Thermal Stability of Individual Sb2O3 Nanowires at Elevated Temperatures. Issue 6 (30th March 2022) - Hou, Lizhen
Abstract : Young's modulus of Sb2 O3 nanowires with nominal diameters of 51–170 nm is measured by using a laser‐Doppler vibrometry within the temperature range of 300–650 K. The Young's modulus is found to decrease linearly with the elevated temperature ranging from 300 to ≈475 K. The temperature coefficient of Young's modulus (TCE) is ≈−170 ppm K −1 when nanowire diameter is above ≈100 nm, below which the coefficient decreases to ≈−310 ppm K −1 with the diameters down to ≈50 nm. This strong size‐dependent TCE is attributed to the synergistic reaction of temperature and size/surface effects. Nanowires would sublimate or even melt starting from their tips at elevated temperatures, even though the temperature is far below the melting point of the bulk counterpart. The observed thermomechanical behavior of nanowires provides the basis and reference for the optimal design and operation of high‐temperature nanodevices using nanowires as building blocks. Abstract : Temperature coefficient of Young's modulus of Sb2 O3 nanowires is ≈−170 ppm K −1 for diameters above ≈100 nm, and then gradually decreases to ≈−310 ppm K −1 with the diameters down to ≈50 nm. Nanowires may sublimate or even melt starting from their tips at elevated temperatures far below the melting point of the bulk counterpart.