Department of Materials Science and Engineering, National Chung Hsing University , Taichung 402, Taiwan.
Langmuir. 2013 Dec 23;29(51):16025-33. doi: 10.1021/la403719c. Epub 2013 Dec 13.
A method for controlling the shapes and sizes of Cu nanoparticles during electrodeposition has been developed by tailoring the surface morphologies of TiN-coated electrodes. Larger octahedral Cu NPs grew on a granular TiN film; smaller, irregular Cu NPs formed on a pyramidal TiN film. The surface morphology of the TiN film affected the accumulation of Cu(2+) and hexadecyltrimethylammonium (CTA(+)) ions, leading to the different shapes and sizes of the resulting Cu NPs. The significant steric effect of the CTA(+) ions was confirmed when using the film of pyramidal TiN as the electrode in the CTAB-containing electrolyte; it contributed to the growth of the smaller, irregular Cu NPs. The sensitivity of the smaller, irregular Cu NPs in the detection of glucose was better than that of the larger, octahedral Cu NPs because of the former's greater increase in the Cu(2+)-to-Cu(0) ratio.
通过定制 TiN 涂层电极的表面形态，开发出了一种在电沉积过程中控制 Cu 纳米颗粒形状和尺寸的方法。较大的八面体 Cu NPs 在颗粒状 TiN 薄膜上生长；较小的不规则 Cu NPs 在金字塔形 TiN 薄膜上形成。TiN 薄膜的表面形态影响 Cu(2+)和十六烷基三甲基铵（CTA(+)）离子的积累，导致生成的 Cu NPs 的形状和尺寸不同。当使用具有金字塔形 TiN 的薄膜作为电极在含有 CTAB 的电解质中时，CTA(+)离子的显著空间位阻效应有助于较小的不规则 Cu NPs 的生长。较小的不规则 Cu NPs 在检测葡萄糖时的灵敏度优于较大的八面体 Cu NPs，因为前者的 Cu(2+)-to-Cu(0) 比值增加更大。
