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. Author manuscript; available in PMC: 2016 May 30.
Published in final edited form as: Adv Mater. 2014 Sep 1;26(39):6761–6766. doi: 10.1002/adma.201402964

Figure 2.

Figure 2

Optical and magnetic properties of Gd@C-dots. (a) Absorption and photoluminescence spectra of Gd@C-dots. (b) Photostability study. Gd@C-dots were under continuous irradiation by UV light (30 W, 254 nm) and the photoluminescence (ex/em 360/425 nm) intensity was monitored over time. (c) Comparison of photostability among FITC, CdSe/ZnS QDs, and Gd@C-dots. The three solutions were under continuous irradiation by UV light (30 W, 254 nm) for different amounts of time. (d) T1-weight MR images of Gd@C-dot agarose samples of different Gd concentrations. (e) Linear correlation between R1 (T1−1) and Gd concentration, based on readings from d. The r1 relaxivity, which is the slope of the curve, was determined to be 5.88 mM−1s−1.