Improving self-assembly quality of colloidal crystal guided by statistical design of experiments |
Different PS latex concentrations for spin-coating: (a) 20 vol.%; (b) 40 vol.%; (c) 60 vol.%. Other conditions are the same: the self-assembly temperature, the final spin-coating speed, and time are 45 °C, 3500 rpm, and 30 s, respectively. Scale bar is 2 µm. |