Manoharan M P, Lee H, Rajagopalan R, Foley H C, Haque M A
Nanoscale Res Lett. 2009 Sep 23;5(1):14-19. doi: 10.1007/s11671-009-9435-2.
Glassy carbon is a disordered, nanoporous form of carbon with superior thermal and chemical stability in extreme environments. Freestanding glassy carbon specimens with 4-6 nm thickness and 0.5 nm average pore size were synthesized and fabricated from polyfurfuryl alcohol precursors. Elastic properties of the specimens were measured in situ inside a scanning electron microscope using a custom-built micro-electro-mechanical system. The Young's modulus, fracture stress and strain values were measured to be about 62 GPa, 870 MPa and 1.3%, respectively; showing strong size effects compared to a modulus value of 30 GPa at the bulk scale. This size effect is explained on the basis of the increased significance of surface elastic properties at the nanometer length-scale.
玻璃碳是一种无序的纳米多孔碳形式，在极端环境中具有卓越的热稳定性和化学稳定性。由聚糠醇前驱体制备并制造出了厚度为4 - 6纳米、平均孔径为0.5纳米的独立玻璃碳试样。使用定制的微机电系统在扫描电子显微镜内原位测量了试样的弹性性能。测得杨氏模量、断裂应力和应变值分别约为62吉帕、870兆帕和1.3%；与体尺度下30吉帕的模量值相比，显示出强烈的尺寸效应。这种尺寸效应是基于纳米长度尺度下表面弹性性能的重要性增加来解释的。
