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. Author manuscript; available in PMC: 2015 Jan 7.
Published in final edited form as: ACS Macro Lett. 2013 Oct 7;2(10):948–951. doi: 10.1021/mz4004248

Figure 2.

Figure 2

(a) Surface charges of nanoparticles by zeta potential (b) Contact angle measurements of unmodified nanoparticles (top) and nanoparticles modified by lauric acid NHS ester (bottom left) and dodecyl isocyanate (bottom right). (c) IR spectra of azidoacetic acid NHS ester (top), unmodified nanoparticles (middle), and nanoparticles functionalized with azidoacetic acid NHS ester (bottom). (d) Fluorescence emission intensity of nanoparticles treated with excess fluorescamine after reacting with different functional groups.