Journal of Radiation Research and Radiation Processing, Volume. 42, Issue 6, 060204(2024)
Dual-responsive reduced graphene oxides prepared by radiation-initiated living radical grafting polymerization
Fig. 1. Schematic illustration for the preparation of GO-TRITT (a),FTIR spectrum of GO (b),XPS spectra of GO,GO-NH2 and GO-TRITT (c) (the inset is the magnified XPS spectrum of GO-TRITT); high resolution spectrum of S 2p of GO-TRITT (d)
Fig. 2. Digital photos of the GO dispersion after radiation grafting polymerization of NIPAAm with the addition of Fe2+ (rGO-g-PNIPAAm-9) (a) and TRITT (rGO-g-PNIPAAm-5) (b) in the solution
Fig. 3. TEM images of GO (a),GO-NH2 (b),GO-TRITT (c),and rGO-g-PNIPAAm (d)
Fig. 4. Raman spectra (a) of rGO-g-PNIPAAm prepared with different absorbed doses and 1H NMR spectra (b) of TRITT,and homo-PNIPAAm in the grafting solution of rGO-g-PNIPAAm(color online)
Fig. 5. Transient absorption spectra of Ar-saturated aqueous solution containing NIPAAm (10 mmol/L) and TRITT (27.4 μmol/L) (a),as well as TRITT only (27.4 μmol/L) (b) after irradiation by pulsed electron beam; evolution of the absorbance at 380 nm and 410 nm of Fig.5(a) (c) (color online)
Fig. 6. Evolution of the absorbance at 720 nm of the Ar-saturated aqueous solution containing tert-butanol (0.5 mol/L) and different concentrations of NIPAAm (a); calculation of the reaction rate constant between NIPAAm and eaq- by linear fitting (b); structure of the reaction products between NIPAAm and eaq- (c); evolution of the absorbance at 472 nm of the N2O-saturated aqueous solution containing different concentrations of KSCN (0.1~0.5 mmol/L) and NIPAAm (d); calculation of the reaction rate constant between NIPAAm and OH by linear fitting (e); structures of the products between NIPAAm and OH (f)(color online)
Fig. 7. ζ potentials of rGO-g-PNIPAAm-5 at different pH ((a),25 ℃) and temperatures ((b),pH 4 and 6)
Fig. 8. Time-dependent temperature (a) and digital photos (b) of the solution containing different concentrations of rGO-g-PNIPAAm-5 under irradiation by 808-nm NIR LASER,and time-dependent temperature (c) of the solution containing rGO-g-PNIPAAm with different absorbed doses for radiation grafting polymerization under irradiation by 808 nm NIR LASER(color online)
Fig. 9. Evaluation of the reusability (a) and TEM image (b) of rGO-g-PNIPAAm-5 after irradiation by 808-nm NIR LASER
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Hanqin WENG, Baoying ZHANG, Xuan WANG, Xin XIAO, Shinichi YAMASHITA, Mozhen WANG, Xuewu GE. Dual-responsive reduced graphene oxides prepared by radiation-initiated living radical grafting polymerization[J]. Journal of Radiation Research and Radiation Processing, 2024, 42(6): 060204
Category: RADIATION CHEMISTRY
Received: Nov. 1, 2024
Accepted: Nov. 28, 2024
Published Online: Jan. 15, 2025
The Author Email: WENG Hanqin (wenghq@mail.sysu.edu.cn)