Fig. 2
SEM images of A SiO2 colloidal crystal film, B SiO2/GNP array, C GNS array and D highly ordered AuNB array. E SERS mapping of the AuNB array modified with 4-MBA (1 × 10− 8 M). F SERS spectra of 10 randomly selected points on the surface of the 4-MBA-labelled AuNB array and G the corresponding scatter diagram of the intensity at 1593 cm− 1. H SERS spectra of AuNB arrays modified with 4-MBA (1 × 10− 8 M) and of pure 4-MBA (1 × 10− 2 M). I SERS spectra of 4-MBA-labelled AuNB arrays prepared in different batches and J the corresponding histogram. K SERS spectra of 4-MBA-labelled AuNB arrays prepared in the same batch and stored for different time and L the corresponding line chart