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. Author manuscript; available in PMC: 2014 May 15.
Published in final edited form as: Anal Chem. 2012 Dec 14;85(1):208–212. doi: 10.1021/ac302510g

Figure 3.

Figure 3

(A) TEM of 3 types of nanostars (NS1-NS3) investigated. NS3 has the most number of branches. (B, C) Extinction spectra and background-subtracted SERRS spectra (right) of SDS-coated NS1-NS3 labeled with IR-780 1 μM. Even though NS3 has more sharp branches, the SERS intensity was lower than that from NS1, which has less absorption background in the Stoke shift region (800–900 nm). The SERS spectra were collected under 785 nm excitation (100 mW, 100 msec, 10 averages). The dash line is the position of the 785 nm laser.