Controlled assembly of nanoparticles on substrates is a promising path to develop miniaturized electronic and optical devices. Among the important issues to be addressed in this area include immobilization of the nanoparticles on substrates in order to ensure that the system is robust. In this work, 16-mercaptohexadecanoic acid (16-MHDA) capped gold nanoparticles with a narrow size distribution have been synthesized through a single phase synthesis method and subsequently immobilized on to silicon surface through covalent molecular assembly. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) confirmed the absence of unreacted thiol in the synthesized gold nanoparticles. Presence of gold nanoparticles on Si surface after the immobilization process was confirmed through XPS. Cross-sectional high resolution transmission electron microscopy (HR-TEM) images provide direct evidence that the particles are indeed anchored to the silicon surface. The formation of uniform-sized and separated acid functionalized gold nanoparticles and their immobilization on to Si provide a basis for further nano-structuring.

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16-巯基十六酸封端的金纳米粒子的合成及其在基材上的固定化

纳米粒子在基板上的受控组装是开发微型电子和光学设备的有希望的途径。该领域需要解决的重要问题包括将纳米颗粒固定在基材上以确保系统稳健。在这项工作中，通过单相合成方法合成了具有窄尺寸分布的 16-巯基十六烷酸 (16-MHDA) 封端的金纳米粒子，然后通过共价分子组装固定在硅表面上。傅里叶变换红外 (FTIR) 光谱和 X 射线光电子能谱 (XPS) 证实合成的金纳米粒子中不存在未反应的硫醇。通过 XPS 确认固定过程后在 Si 表面上存在金纳米粒子。横截面高分辨率透射电子显微镜 (HR-TEM) 图像提供了直接证据，表明颗粒确实固定在硅表面上。尺寸均匀且分离的酸功能化金纳米粒子的形成及其在硅上的固定为进一步纳米结构化提供了基础。