Table 2.

Effect of Na₂S Treatment on Nanorod Plasmon Resonance and Optical Drift^a

		sulfur:metal ratiob
sample		no S	1:2	1:1	4:1
t = 15 min	λmaxc	840	824	851	905
	Δλd	−100	−31	−18	−5
t = 30 min	λmaxc	792	771	789	807
	Δλd	−51	−11	−9	−5
t = 50 min	λmaxc	758	756	768	783
	Δλd	−56	−11	−5	∼0

^aAll nanorods were isolated immediately after Na₂S treatment by centrifugation and redispersed in deionized water.

^bMetal includes total Au and Ag ions added to initial reaction mixture.

^cTaken immediately after 1 C/R cycle, in nm.

^dShift in λ after 6 days, in nm. Differences in initial wavelengths prior to sulfide treatment preclude a fully quantitative comparison between samples.