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on of Carbon Nanotubes by Fluorescein?Polyethylene Glycol: Supramolecular Conjugates with pHDependent Absorbance and Fluorescence Nozomi NakayamaRatchford, Sarunya Bangsaruntip, Xiaoming Sun, Kevin Welsher, and Hongjie Dai etc J. AM. CHEM. SOC. 2022, 129, 24482449 Figure 1. (a) Schematic showing SWNT and FluorPEG (1). Figure 1. (b) Atomic force microscopy image of FluorPEG/SWNTs deposited on substrate. Figure 1. (c) Photo of FluorPEG/SWNT in water (left, yellowgreen color due to SWNTbound Fluor), after heating at 70 176。 C for 2 days (center), and in cell culture medium supplemented with10% serum (right, red color due to cell medium). Unbound FluorPEG was dialyzed in the starting solution . Figure 2. Optical properties of SWNTbound FluorPEG. (a) Absorbance of FluorPEG/SWNT and free FluorPEG. Fig 2. (b) Corresponding fluorescence emission spectra. Fig 2. (c) Emission peak intensity of SWNT bound FluorPEG and free FluorPEG in a fluorescein concentration range of 200900 nM. Figure 3. pHdependent fluorescence and absorbance of FluorPEG/SWNT. Absorption curves of FluorPEG/SWNT at various pHs in the (a) fluorescein region (dashed line marks the peak at pH 12) . Figure 3. (b) SWNT region (curves are displaced for