Large defect-free domains of a hexagonal packed monolayer of silica spheres with the size of 4000 µm² were successfully prepared by dual-speed spin coating. Experimental design and statistical analysis instead of the traditional ‘changing one separate factor at a time’ (COST) approach were employed to guide the implementation of the experiments. With its assistance, the hexagonal-close-packed (HCP) percentage was elevated to 84% in this study. Furthermore, almost all the samples with parameters in the selected ranges possessed more than a 60% HCP percentage. In addition, the optimal values for parameters of the suspension concentration, the first rotation speed, and the spinning time to obtain well-ordered silica spheres arrays were also identified as 30 wt.%, 1000 rpm and 20 s, respectively.

中文翻译：

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统计实验设计指导的二维胶体晶体掩模大尺寸无缺陷域的可控制备

通过双速旋涂成功地制备了尺寸为4000 µm ²的六方堆积二氧化硅球单层的大无缺陷区域。实验设计和统计分析代替了传统的“一次更改一个单独的因素”（COST）方法，来指导实验的实施。在它的协助下，本研究中六方密堆积（HCP）百分比提高到84％。此外，几乎所有参数在选定范围内的样品都具有超过60％的HCP百分比。另外，悬浮液浓度，第一旋转速度和纺丝时间的参数的最佳值也被确定为获得有序的二氧化硅球阵列的最佳值，分别为30 wt。％，1000 rpm和20 s。