Figure 2.

NIR imaging of SWCNT suspensions (left) and corresponding spectra (right). (A) SWCNTS prepared in 2% SDC, (B) 1% pluronic and (C) dialyzed puronic/SDC. Note the differences in intensity and spectral profiles for SWCNTs that are less bundled (2% SDC and dialyzed) and loss of fluorescence with pluronic only. To ensure dialyzed SWCNTs did not elicit toxicity, small airway epithelia cells were exposed to a range of concentrations (μg/ml) for 24 hours and viability quantified. No toxicity was observed at any of the doses tested (N=3).