【摘要】 目的研究相结构对十八烷基三氯硅烷(OTS)分子膜纳米机械性能的影响。方法分别在冰水混合物温度和室温下制备了OTS分子膜的样品,利用原子力显微镜表征表面形貌,通过施加不同的探针作用力观察相对高度差变化。结果随着针尖作用力的增加,冰水混合物温度下制备的OTS分子膜的相对高度差一直维持在2.02 nm左右;在室温下制备的OTS分子膜,针尖作用力在800 pN以下时,高度值维持在1.73 nm左右;针尖作用力增加到800 pN时,其相对高度差开始下降;当作用力增加到4 nN时,其相对高度差维持在1.44 nm左右。结论有序致密排列的OTS分子岛具有较强的纳米机械强度,无序疏松的OTS分子岛具有较弱的纳米机械强度,易在较大探针作用力下被压变形。更多还原

【Abstract】 The work aims to study the effects of phase structure on nano-mechanical strength of octadecyltrichlorosilane(OTS) molecular films. The OTS molecular film samples were prepared at the temperature of ice-water mixture and room temperature, respectively. Morphology of two samples was characterized with AFM, and height difference of the films were observed by applying various tip-loading forces. With the increase of tip-loading force, relative height difference of OTS molecular film prepared at the temperature of ice-water mixture was constantly maintained at nearly 2.02 nm; for the OTS molecular film prepared at room temperature, the relative height difference did not decrease until the tip-loading force increased to 800 pN, and was maintained at nearly 1.44 nm as the force increased to 4 nN. The orderly and densely arranged OTS molecular film is of higher nano-mechanical strength while disorderly and loosely arranged OTS molecular film is of lower nano-mechanical strength, and may be subject to compressive deformation provided with high tip-loading force.更多还原