Figure 3.

Cross-sectional SEM micrograph of micro and nano-complex polymer structure formed on LED device with spin coating speed of (a) 1,000 rpm, (b) 3,000 rpm, and (c) 5,000 rpm.

Cho et al. Nanoscale Research Letters 2011 6:578   doi:10.1186/1556-276X-6-578
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