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Fig. 3 | Nanoscale Research Letters

Fig. 3

From: Preparation of a Periodic Polystyrene Nanosphere Array Using the Dip-Drop Method with Post-deposition Etching and Its Application of Improving Light Extraction Efficiency of InGaN/GaN LEDs

Fig. 3

SEM images of PS NSs with PS NS suspension concentrations of a 1.4 × 1011, b 2.7 × 1011, c 4.1 × 1011, and d 5.4 × 1011 sphere/cm−3 for 100-nm PS NSs; e 1.7 × 1010, f 3.4 × 1010, g 5.1 × 1010, and h 6.8 × 1010 sphere/cm−3 for 200-nm PS NSs; and i 1.1 × 109, j 2.1 × 109, k 3.2 × 109, and l 4.3 × 109 sphere/cm−3 for 500-nm PS NSs at an average dip-drop speed of 0.005 mL/s. The insets of c, g, and k represent the cross-section SEM images of PS NSs with PS NS suspension concentrations of 4.1 × 1011 sphere/cm−3 for 100-nm PS NSs, 5.1 × 1010 sphere/cm−3 for 200-nm PS NSs, and 3.2 × 109 sphere/cm−3 for 500-nm PS NSs

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