State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry and Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun, People's Republic of China.
Nanotechnology. 2011 Jun 3;22(22):225503. doi: 10.1088/0957-4484/22/22/225503. Epub 2011 Apr 1.
An electrochemical microcantilever (EMC) was used to study the intermolecular interaction of self-assembly monolayers (SAMs) with different n-alkanethiols chain lengths (n = 0, 4, 6, 8, 12, 16) on a Au-coated microcantilever surface. Comparing potential cycling and steps in NaClO(4) solution within the same potential range, the deflection rate of bare microcantilevers is much smaller for the former which revealed that potential excitation, i.e. the surface charge, played the dominant role in driving the instant and large deflection of the bare microcantilever, while the smaller deflection amplitude of the former implied that adsorption of ClO(4)( - ) had an adverse effect on the potential-induced stress. Upon adsorption of SAMs, the deflection amplitude of the microcantilever under the potential step was much smaller than that of a bare microcantilever, and linearly decreased with the chain length increasing for n ≤ 8 (the linear correlation coefficient and the slope are 0.98 and about - 10.4 nm per CH(2) unit, respectively), following a transition (8 ≤ n ≤ 12) to a stable state (n ≥ 12). The decrease of deflection amplitude and faster decay of deflection rate of the SAMs modified microcantilever under the potential step implyed increasing compactness of the SAMs with longer chains.
电化学微悬臂梁（EMC）被用于研究不同链长的自组装单分子层（SAMs）与金涂覆微悬臂梁表面之间的分子间相互作用，这些 SAMs 的链长分别为 n = 0、4、6、8、12、16。在相同的电位范围内比较 NaClO(4)溶液中的电位循环和阶跃，裸微悬臂梁的挠度率对于前者要小得多，这表明电位激发，即表面电荷，在驱动裸微悬臂梁的瞬时和大挠度中起着主导作用，而前者的挠度幅度较小表明 ClO(4)( - )的吸附对电位诱导的应力有不利影响。在 SAMs 吸附后，微悬臂梁在电位阶跃下的挠度幅度比裸微悬臂梁小得多，并且对于 n ≤ 8（线性相关系数和斜率分别为 0.98 和约 - 10.4nm/CH(2)单元），线性减小，然后过渡到稳定状态（8 ≤ n ≤ 12）。在电位阶跃下，SAMs 修饰的微悬臂梁的挠度幅度减小和挠度率的衰减加快，表明长链的 SAMs 越来越紧密。
