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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Ann Biomed Eng. 2009 Feb 26;37(10):1960–1966. doi: 10.1007/s10439-009-9660-y

Figure 2.

Figure 2

Photo-induced quenching of the CTAB-coated QDs. (a) 30 nM QD-CTAB solution made fresh (right) and aged for 48 hours (left). The fluorescence of the aged sample clearly diminished, which was also confirmed with spectroscopic studies (inset). (b) Time lapse spectroscopic measurements show that not only the fluorescence intensity decreased over time, the fluorescence emission peak also blue shifted from 622 nm to 600 nm, indicating QD decomposition. This result was also confirmed by TEM studies of fresh (c) and aged (d) samples. The particle size reduced significantly.