Mohamed Ali Tehrani Ramin, Ab Ghani Sulaiman
Pusat Pengajian Sains Kimia, Universiti Sains Malaysia, 11800 USM, Pulau Pinang, Malaysia.
J Colloid Interface Sci. 2009 Nov 1;339(1):125-32. doi: 10.1016/j.jcis.2009.07.042. Epub 2009 Jul 24.
The nickel (Ni) nanocrystals (average diameter 9.7+/-2.3nm) were deposited onto composite graphite electrode from a plating solution of 5.0mM NiCl(2)6H(2)O and 1.0M NH(4)Cl using scan rate of 6500mVs(-1). The initial potential -1.5V and final potential -0.5V vs. Ag/AgCl with applied time 120s were used for the whole deposition process. The variations of applied overpotentials and deposition times have affected the characteristics of Ni nanocrystals. It was found that the structural formation of Ni nanocrystals obtained were almost pure hexagonal close-packed (hcp). This study has demonstrated that the tuning of the final size, morphology and structural formation of the Ni nanocrystal were affected by control of nucleation, growth and hydrogen evolution processes in fast scan voltammetry technique used.
镍（Ni）纳米晶体（平均直径9.7±2.3nm）通过使用6500mVs(-1)的扫描速率，从含有5.0mM NiCl₂·6H₂O和1.0M NH₄Cl的电镀液中沉积到复合石墨电极上。整个沉积过程使用相对于Ag/AgCl的初始电位-1.5V和最终电位-0.5V以及施加时间120s。施加过电位和沉积时间的变化影响了镍纳米晶体的特性。发现所获得的镍纳米晶体的结构形成几乎是纯六方密堆积（hcp）。这项研究表明，在所用的快速扫描伏安法技术中，通过控制成核、生长和析氢过程，可以影响镍纳米晶体的最终尺寸、形态和结构形成。
