School of Mechanical and Mining Engineering, the University of Queensland, Brisbane, QLD 4072 Australia. School of Physics and Electronics, Central South University, Changsha, 410083, People's Republic of China.
Nanotechnology. 2016 Nov 25;27(47):475701. doi: 10.1088/0957-4484/27/47/475701. Epub 2016 Oct 21.
Single-crystalline α-AlO nanobelts were synthesized by high-temperature chemical vapor deposition in a high-purity H atmosphere. The crystalline planes for the upper and side surfaces of the nanobelts were [Formula: see text] and [Formula: see text] and the orientations along height, length and width directions were [Formula: see text] [Formula: see text] and [Formula: see text] respectively. The formation of such a unique structure was dependent on the strong reducing atmosphere used in the growth process, and the deactivation of the [Formula: see text] plane by hydrogen could be the primary cause. The elastic modulus of the nanobelts was measured using a thermal resonance method. The moduli for the nanobelts were about 320 GPa for thicknesses above 40 nm, and slightly increased to 356 GPa as the thickness decreased to 31 nm. The slightly low modulus values compared to the theoretical value of 371 GPa is attributed to oxygen vacancies within the nanobelts, while the increase in modulus with decreased thickness comes from the stiffening effect caused by surface relaxation.
通过在高纯 H 气氛中进行高温化学气相沉积，合成了单晶α-AlO 纳米带。纳米带的上表面和侧表面的晶面分别为[Formula: see text]和[Formula: see text]，沿高度、长度和宽度方向的取向分别为[Formula: see text] [Formula: see text]和[Formula: see text]。这种独特结构的形成取决于生长过程中使用的强还原气氛，而氢对[Formula: see text]面的失活可能是主要原因。使用热共振法测量了纳米带的弹性模量。对于厚度大于 40nm 的纳米带，其模量约为 320GPa，当厚度减小到 31nm 时，略有增加至 356GPa。与 371GPa 的理论值相比，略低的模量值归因于纳米带中的氧空位，而随着厚度的减小模量增加则来自于表面弛豫引起的硬化效应。
