Table S1: Refractive index sensitivities of monolayers of 80 nm silver nanocube on glass as a function of surface pressure. Surface pressure/ mN/mnm 0.1 mN/m
5 mN/m
20mN/m
25mN/m
35mN/m 5 mN/m with spacerb
25 mN/m with spacerb
35 mN/m with spacerb
a
b
Plasmon peak position λ/nm 480 450 380 350 480 450 380 480 450 380 480 450 380 480 450 380 480 450 380 350 480 450 380 350 480 450 380 350
Refractive index sensitivity (nm/RIU) 73+/-27 89+/-20 46+/-13 39+/-10 n.d.a 103+/-17 50+/-6 225+/-70 83+/-8 42+/-16 n.d. 87+/-30 98+/-30 n.d. n.d. 71+/-17 280+/-138 81+/-20 48+/-18 32+/-12 160+/-52 76+/-24 41+/-18 24+/-2 114+/-55 77+/-6 51+/-16 28+/-9
Figure of merit 0.46 2.12 1.0 1.67 n.d. 2.3 1.3 1.56 2.2 1.0 n.d. 1.3 2.1 n.d. n.d. 1.2 1.6 1.7 1.2 1.92 1.0 2.8 1.26 1.2 0.7 1.76 1.34 1.4
Not determined.
Phospholipid 1, 2-Dipalmitoyl-sn-Glycero-3-Phosphoethanolamine-N-(lissamine rhodamine B sulfonyl) (ammonium salt, DPPE-RhB) was added as a inert spacer to prevent the nanocubes from aggregation.
Figure S1. Top: UV-vis spectra of supported 80 nm nanocubes on different substrates: quartz, sapphire, glass slide with coated with 5 nm TiO2 film, glass slide coated with 5 nm of silicon. Bottom: Plasmon shifts plotted vs. the refractive index of a substrate.
Figure S2. Angular dependence of UV-vis extinction spectra for 40 nm nanocubes deposited on different substrates.
