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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Biomaterials. 2013 Mar 22;34(19):4643–4654. doi: 10.1016/j.biomaterials.2013.02.063

Figure 4.

Figure 4

a) Time-dependent bleaching of SOSG and AuNCs@SiO2-Ce6 caused by the singlet oxygen (SO) generated by AuNCs@SiO2-Ce6. b) The changes of optical density at various peaks (404 and 646 nm) as the function of laser irradiation time. c) Fluorescence emission spectra of AuNCs@SiO2-Ce6 in SOSG solution with the increase of the laser irradiation time. d) The changes of fluorescence intensity at the characteristic peaks of SOSG (528 nm) and Ce6 (662 nm) as a function of laser irradiation time. The concentration of Ce6 in AuNCs@SiO2-Ce6 is fixed at 0.5 μM. The mixture solutions were irradiated with a 671 nm laser (200 mW/cm2). SOSG was dissolved in water containing 2% methanol with the final concentration of 1 μM. SOSG fluorescence emission was produced using an excitation wavelength of 494 nm.