In the manipulation of nanoparticles for precise placement, the relatively low adhesion of the nanoparticles to the substrate surface has emerged as a problem. Owing to the fact that nanoparticles manipulated using atomic force microscopy (AFM) often cannot be accurately placed at their predetermined destinations or may even go astray, becoming “lost,” the success rate of manipulation attempts is low. We investigated the possibility of enhancing the adhesion between magnetic nanoparticles and a substrate surface by modifying a mica substrate with a solution of 3-aminopropyltriethoxysilane (APTES). The morphology of the mica surface before and after modification was analyzed, and the adhesive force was calculated by using AFM in contact mode. The effect of different APTES-solution concentrations on the adhesive force was analyzed as well. The results demonstrate that the adhesion of the nanoparticles to the modified substrate was substantially stronger than their adhesion to an unmodified surface, a finding that can be used to improve the success rate of nanoparticle manipulation.

中文翻译：

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通过氨基硅烷改性提高云母基底纳米粒子与表面之间的附着力

在用于精确放置的纳米颗粒的操作中，已经出现了纳米颗粒相对于基底表面的相对低的粘附性的问题。由于使用原子力显微镜（AFM）操纵的纳米粒子通常无法准确地放置在其预定位置，甚至可能误入歧途，甚至变得“迷路”，因此操纵尝试的成功率很低。我们研究了通过用3-氨丙基三乙氧基硅烷（APTES）溶液改性云母基材来增强磁性纳米颗粒与基材表面之间粘附的可能性。分析了改性前后云母表面的形态，并通过接触模式下的AFM计算了粘合力。还分析了不同APTES溶液浓度对粘合力的影响。