I am working on  a ZnO and polymer based LED. I need to fill the gap between ZnO nanorods by spin coating with polystyrene to make them isolated. I made polystyrene solution and spin coated at 2000 rpm for 30 seconds. The whole surface was covered, and I did Argon Plasma etching to expose the upper part of nanorods but could not get the open part of ZnO nanorods on he top. So, could anybody suggest the good recipe for this? Thanks.

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