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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Environ Sci Nano. 2019 Apr 10;6(5):1516–1526. doi: 10.1039/C8EN01381K

Figure 4.

Figure 4.

(a) UV-VIS absorption spectra of CNF and FITC-CNF. The inset presents the absorption spectrum of FITC-CNF without the contribution by the untagged CNF. (b) UV-VIS absorption spectra of CNC and FITC-CNC. The inset presents the absorption spectrum of FITC-CNC without the contribution by the untagged CNC. (c) Emission spectra of FITC-CNF and FITC-CNC upon excitation at 470 nm and 480 nm, respectively; the “Controls” are overlaid spectra of untagged CNF and untagged CNC. The molecular structure of fluorescein isothiocyanate (FITC) is shown as an inset. The concentration of FITC-CNF, FITC-CNC, untagged CNF, and untagged CNC were 0.5 mg/ml; cut-off wavelengths were set at 475 nm and 485 nm for FIC-CNF and FITC-CNC, respectively.