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. Author manuscript; available in PMC: 2013 Oct 23.
Published in final edited form as: Adv Mater. 2012 Aug 9;24(40):5457–5463. doi: 10.1002/adma.201201820

Figure 2.

Figure 2

(a) Optical absorption of the tri-layer nanocapsules; (b) SERS characterization of BPE from 1 pM to 1 µM shows clear SERS spectra; (c) SERS intensity increases with BPE concentrations; (d) Raman mapping profile of 1 µM R6G dispersed on a tri-layer nanocapsule shows uniform SERS intensity on the entire surface of the nanocapsules. (1655 cm−1, scan step 250 nm, integration time 0.5s) (e) SERS intensity distribution along the nanocapsule. (f) Variation of SERS spectra of R6G molecules in a 100-sec time frame with 1-sec integration for each spectrum. (g) Intensity of SERS at 1655 cm−1 as a function of time.