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. Author manuscript; available in PMC: 2020 Jul 28.
Published in final edited form as: Langmuir. 2009 Nov 3;25(21):12454–12459. doi: 10.1021/la902992w

Figure 1.

Figure 1.

Surface modification of GNRs and characterization of TPL from GNRs. (a) Structure of PEG-NRs (linear PEG: 2k and 5k; branched PEG: 7k). (b) TPL emission spectra from CTAB-NR and PEG-NR solution. (c) TPL emission spectra from PEG-NRs in water, PBS, and serum. For b and c, 6 μL of each solution was dropped into a small chamber on a coverslip. TPL was excited at the wavelength of the longitudinal plasmon peak of each sample with the same laser power and photomultiplier tube voltage, and spectra were recorded from the solution with the laser focused at 20 μm above the coverslip. (d) TPL intensity vs PEG-NR concentration in aqueous solution. A linear dependence was observed from 4.7 nM to 0.11 nM.