Elastic Properties of Polystyrene Nanospheres Evaluated with Atomic Force Microscopy: Size Effect and Error Analysis

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• 作者：Dan Guo ; Jingnan Li ; Guoxin Xie ; Yuanyuan Wang ; Jianbin Luo
• 刊名：Langmuir
• 出版年：2014
• 出版时间：June 24, 2014
• 年：2014
• 卷：30
• 期：24
• 页码：7206-7212
• 全文大小：397K
• ISSN：1520-5827

文摘

The mechanical properties of polystyrene (PS) nanospheres of ca. 50鈥?000 nm in diameter were evaluated by using an atomic force microscope (AFM). The compressive elastic moduli of individual nanospheres were obtained by analyzing the AFM force鈥揹isplacement curves on the basis of the Hertz and JKR contact theories. The results showed that the elastic moduli of PS nanospheres of different sizes were in the range of 2鈥? GPa. The elastic modulus of PS nanospheres increased with the decrease of the sphere diameter, especially when the diameter was less than 200 nm. The measurement errors due to tip wear and the deformation at the bottom of the sphere were analyzed. Mechanisms for the size dependence on the elastic modulus of PS nanospheres were also discussed.