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. Author manuscript; available in PMC: 2009 Dec 17.
Published in final edited form as: J Am Chem Soc. 2008 Dec 17;130(50):17095–17105. doi: 10.1021/ja8068853

Figure 4.

Figure 4

Characterization of optical properties of single Ag, AgMMUA and AgMMUA-MAB nanoparticles:

(A) UV-Vis spectra of 300 nM of (a) 2.6 nm Ag nanoparticles in nanopure water; (b) AgMMUA in nanopure water; (c) AgMMUA-MAB in 10 mM PBS (pH 7.0), showing that the peak wavelengths at 388 nm (FWHM = 66 nm; A = 1.42), 406 nm (FWHM = 116 nm; A = 1.14), and 410 nm (FWHM = 138 nm; A = 0.74), respectively.

(B) Histograms of color distribution of single nanoparticles in (A): (a) 2.6 nm Ag nanoparticle in nanopure water: (82 ± 2)% of blue and (18 ± 2)% green nanoparticles; (b) AgMMUA in nanopure water: (17 ± 2)% of blue and (83 ± 2)% green nanoparticles; and (c) AgMMUA-MAB in 10 mM PBS (pH 7.0): (3 ± 1)% of blue and (97 ± 1)% green nanoparticles.

(C) LSPR spectra of a representative single blue: (a) Ag nanoparticle (λmax = 465 nm; FWHM = 53 nm), (b) AgMMUA nanoparticle (λmax = 474 nm; FWHM = 63 nm), and (c) AgMMUA-MAB nanoparticle (λmax = 477 nm; FWHM = 74 nm).

(D) LSPR spectra of a representative single green: (a) Ag nanoparticle (λmax = 513 nm; FWHM = 64 nm), (b) AgMMUA nanoparticle (λmax = 543 nm; FWHM = 69 nm), and (c) AgMMUA-MAB nanoparticle (λmax = 570 nm; FWHM = 76 nm).