Axima cfrtm plus instrument

The ¹H NMR was recorded on a Bruker AVANCE III HD spectrometer at 500 MHz (Bruker, MA, USA), using CDCl₃ as the solvent at 298 K. TMS was used for ¹H NMR spectra as an internal standard. The MALDI-TOF-MS mass spectra were recorded using an AXIMA-CFRTM plus instrument (Shimadzu, Kyoto, Japan). UV-vis absorption spectra were recorded on an Agilent Cary100 spectrophotometer (Agilent, CA, USA). Fluorescent spectra were measured with a Shimadzu RF-6000 (Shimadzu, Kyoto, Japan). The absolute quantum efficiency was measured by a HORIBA QM8000 spectrometer (HORIBA, Shanghai, China). FT-IR spectra were recorded on a PerkinElmer Spectrum 400 infrared spectrometer (PerkinElmer, MA, USA). The morphology of the fluorescent cellulose films was photographed on a transmission electron microscope (JEOL JEM-2100, Tokyo, Japan).

The ¹H NMR was recorded on a Bruker AVANCE III HD spectrometer at 500 MHz (Bruker, MA, USA), using CDCl₃ as the solvent at 298 K. TMS was used for ¹H NMR spectra as an internal standard. The MALDI-TOF-MS mass spectra were recorded using an AXIMA-CFRTM plus instrument (Shimadzu, Kyoto, Japan). UV-vis absorption spectra were recorded on an Agilent Cary100 spectrophotometer (Agilent, CA, USA). Fluorescent spectra were measured with a Shimadzu RF-6000 (Shimadzu, Kyoto, Japan). The absolute quantum efficiency was measured by a HORIBA QM8000 spectrometer (HORIBA, Shanghai, China). FT-IR spectra were recorded on a PerkinElmer Spectrum 400 infrared spectrometer (PerkinElmer, MA, USA). The morphology of the fluorescent cellulose films was photographed on a transmission electron microscope (JEOL JEM-2100, Tokyo, Japan).