Profile prediction and fabrication of wet etched gold
nanostructures for localized surface plasmon resonance
Xiaodong Zhou, Nan Zhang, Christina Tan
Institute of Materials Research and Engineering, A*STAR (Agency for Science,
Technology and Research), 3 Research Link, Singapore 117602
Fig. S1. Scanning electron microscope (SEM) photo of polystyrene nanospheres on the
glass substrate after wet etching. Polystyrene nanospheres melt in the potassium iodide
gold etchant. The gold on the top of the nanospheres was etched away, but some was
covered under the waxy polystyrene material and could not be etched.
Fig. S2. Polystyrene nanospheres should be removed prior to gold wet etching. (a) is the
SEM image before the removal of the nanospheres, and (b) is the image of the free
standing shells after nanospheres being burnt.