They first sealed Na 125I inside SWNTs to form high-density radioemitting crystals. (49) reported radionuclide-filled and glycosylated SWNTs and their usage as radioprobes.
CRYSTALVIEWER CARBONNANO TUBE DIAMETER SKIN
The high-resolution intravital image of tumor vessels beneath thick skin was achieved, because of the deep tissue penetration and low autofluorescence background. They further used the exchange-SWNT as in vivo NIR photoluminescence imaging agents for live mice. The sharp E11 absorption peaks (1000–1300 nm) in UV–Vis–NIR spectra also indicated exchange-SWNT high quantum yield. The photoluminescence yield of exchange-SWNT was much higher than that of direct-SWNT. Fig. 11.13C showed the photoluminescence versus excitation spectra for cholate-SWNT, exchange-SWNT, and direct-SWNT solutions. The PL-PEG-coated SWNTs prepared by the exchange method were much brighter than the direct-SWNTs. Exchange- and cholate-SWNTs show sharp transition peaks direct-SWNTs show very low and broad absorption features (47).įig. 11.13B presents the NIR photoluminescence images of cholate-SWNT, exchange-SWNT, and direct-SWNT solutions excited at 808 nm at equal concentrations. The dotted lines show how peaks are redshifted after exchange. (C) Photoluminescence versus excitation spectra show improved quantum yield in cholate and exchange samples. Exchange-SWNTs show greater fluorescence yield than direct-SWNTs. (B) Near-infrared (NIR) photoluminescence images of the three solutions excited at 808 nm at equal concentrations. Cholate ( red (gray in print versions) and white balls) on SWNTs (gray) is dialyzed and eventually replaced by phospholipid-polyethylene glycol (PL-PEG) to form biocompatible nanotubes without damaging the integrity of the nanotube sidewall. Comparison of exchange- and direct-single-walled carbon nanotubes (SWNTs).
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