Supporting Information
Reversible surface wettability conversion of graphene films: optically
controlled mechanism
Yunyun Huang, Xudong Chen, * Ming Qiu Zhang, *
Key Laboratory of the Ministry of Education for Polymer Composite and Functional Materials,
Key Laboratory of Designed Synthesis and Application of Polymer Materials, School of Chemistry
and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China
Fig. S1 SEM images of G(H2O), G(DMF) and G(THF) before UV irradiation (a, b, c), after UV
irradiation for 1 h (d, e, f), and after dark storage for 24 h (g, h, i)
Fig. S2 AFM testing of graphene surface before (a) and after (b) UV irradiation.
Fig. S3 TEM images of G(THF) (a) before UV irradiation, (b) after UV irradiation for 1 h, and (c)
after dark storage for 24 h. The insets are the selected area electron diffraction (SAED) patterns
recorded on the plane of graphene
Fig. S4 X-ray photoelectron C 1s (a1, b1, c1) and O 1s (a2, b2, c2) spectra of G(THF) (a) before
UV irradiation, (b) after UV irradiation for 1 h, and (c) after dark storage for 24 h
Fig. S5 CAs of GO (H2O), GO (DMF) and GO (THF) before UV irradiation, after UV irradiation
and after dark storage
Fig. S6 Water CAs of G(THF) that had been exposed to (a) incandescent light for 1 h and (b)
infrared light for 1h
Fig. S7 (a) Water CA of G(THF) that was exposed to UV for 1 h and then stay in dark in N2 for 24
h. (b) Water CA of G(THF) that was exposed to UV for 1 h and then exposed to infrared light for
24 h. (c) Water CA of G(THF) that was exposed to UV for 1 h and then exposed to natural light for
24 h. (d) Water CA of G(THF) that was exposed to UV for 1 h and then exposed to natural light for
1 month