Figure 2. Fluorescence and FTIR spectra of wmSiNC and purified mSiNC. (A–E) Typical spectra among 3 (A), 9 (B), and 17 (D and E) entirely independent experiments are shown. (A) FTIR spectra of wmSiNCs (top) and mSiNCs after gel filtration HPLC (bottom), with peaks corresponding to alkyl C-Hx bonds at 2,949 and 2,847 cm−1, indicating the 3-MPTS binding to SiNCs. (B) Fluorescence spectra of wSiNCs (dashed line) and wmSiNCs (solid line) excited at 405 nm. (C) Fluorescence image of a cuvette containing mSiNCs, excited with a UV lamp. (D) Absorption (black; y axis on the left, see the black arrow) and fluorescence (red, excitation at 405 nm; y axis on the right, see the red arrow) spectra for mSiNCs after Superdex 75 gel filtration HPLC in 50 mM phosphate buffer, pH 7.0. (E) The expanded absorption spectrum of mSiNC (350–600 nm). a.u., arbitrary unit.
Figure 2.

Fluorescence and FTIR spectra of wmSiNC and purified mSiNC. (A–E) Typical spectra among 3 (A), 9 (B), and 17 (D and E) entirely independent experiments are shown. (A) FTIR spectra of wmSiNCs (top) and mSiNCs after gel filtration HPLC (bottom), with peaks corresponding to alkyl C-Hx bonds at 2,949 and 2,847 cm−1, indicating the 3-MPTS binding to SiNCs. (B) Fluorescence spectra of wSiNCs (dashed line) and wmSiNCs (solid line) excited at 405 nm. (C) Fluorescence image of a cuvette containing mSiNCs, excited with a UV lamp. (D) Absorption (black; y axis on the left, see the black arrow) and fluorescence (red, excitation at 405 nm; y axis on the right, see the red arrow) spectra for mSiNCs after Superdex 75 gel filtration HPLC in 50 mM phosphate buffer, pH 7.0. (E) The expanded absorption spectrum of mSiNC (350–600 nm). a.u., arbitrary unit.

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