Fig. 1From: Self-Shadowing Deposited Pure Metal Nanohelix Arrays and SERS ApplicationTop-view and cross-section SEM images of 1.5-turn Ag NHAs deposited at spin rates of a 0.017, b 0.023, c 0.029, and d 0.035 rpm and e 1.5-turn Au NHA deposited at a spin rate of 0.029 rpmBack to article page