Fig. 6
From: Nanostructured plasmonic substrates for use as SERS sensors
a–c Reproduced with permission from Ref. [44], © 2011, John Wiley and Sons. d–f Reproduced with permission from Ref. [45], © 2012, American Chemical Society
Hot-spot generation using block copolymer lithography. a Schematic diagrams illustrating the procedures used to fabricate a block copolymer-assisted SERS substrate. b SEM images of gold nanoparticle arrays prepared with different overgrowth times of 1, 3, 7, or 15Â min. c SERS spectra of 4-aminobenzenethiol, obtained from gold nanoparticles with different overgrowth times. d Schematic diagrams illustrating the block copolymer micelle-assisted silver nanocluster assembly. e, f SEM image of silver nanocluster arrays obtained by controlling the weight percent of PS and the PS molecular weight: e 10,400Â g/mol or f 122,000Â g/mol, using similar weight percentages of P4VP.