Supporting Information from Sensitive SERS nanotags for use with a hand-held 1064 nm Raman spectrometer

General experimental details for the synthesis and characterisation of dyes 1-17 and HGNs; schematic detailing experimental setup, figures of extinction spectra for HGNs and selected chalcogenopyrylium dyes; chemical structures for dyes 1-17 and commercial reporters; SERS spectra and LOD plots for dye/HGN nanotags plus commercial reporter/HGN nanotags with 1064 nm excitation.