Park Yoonsu, Kang Hyeri, Jeong Wooseok, Son Hyungbin, Ha Don-Hyung
School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.
Nanomaterials (Basel). 2021 Jan 8;11(1):133. doi: 10.3390/nano11010133.
Colloidal nanoparticles (NPs) have been recently spotlighted as building blocks for various nanostructured devices. Their collective properties have been exhibited by arranging them on a substrate to form assembled NPs. In particular, electrophoretic deposition (EPD) is an emerging fabrication method for such nanostructured films. To maximize the benefits of this method, further studies are required to fully elucidate the key parameters that influence the NP deposition. Herein, two key parameters are examined, namely: (i) the aging of colloidal NPs and (ii) the charge formation by surface ligands. The aging of CuS NPs changes the charge states, thus leading to different NP deposition behaviors. The SEM images of NP films, dynamic light scattering, and zeta potential results demonstrated that the charge control and restoration of interparticle interactions for aged NPs were achieved via simple ligand engineering. The charge control of colloidal NPs was found to be more dominant than the influence of aging, which can alter the surface charges of the NPs. The present results thus reveal that the charge formation on the colloidal NPs, which depends on the surface ligands, is an important controllable parameter in EPD.
胶体纳米颗粒（NPs）最近作为各种纳米结构器件的构建块受到关注。通过将它们排列在基板上形成组装的NPs，可以展现出它们的集体性质。特别是，电泳沉积（EPD）是一种用于此类纳米结构薄膜的新兴制造方法。为了最大限度地发挥这种方法的优势，需要进一步研究以充分阐明影响NP沉积的关键参数。在此，研究了两个关键参数，即：（i）胶体NP的老化和（ii）表面配体形成的电荷。CuS NPs的老化改变了电荷状态，从而导致不同的NP沉积行为。NP薄膜的SEM图像、动态光散射和zeta电位结果表明，通过简单的配体工程可以实现老化NP的电荷控制和颗粒间相互作用的恢复。发现胶体NP的电荷控制比老化的影响更占主导地位，老化会改变NP的表面电荷。因此，目前的结果表明，取决于表面配体的胶体NP上的电荷形成是EPD中一个重要的可控参数。
