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Supplementary InformationA facile fabrication of colourimetric graphene oxide reflecting films for ultrasensitive optical gas sensingTingyuanGong, XiaoxiaoZhang, YuchenFu, GuoweiZhou, HongChi*, Tianduo Li*Shandong Provincial Key Laboratory of Fine Chemicals, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology, Jinan 250353, People's Republic of ChinaE-mail address: ch9161@; litianduo@Tel: +86 531 89631207; Fax: +86 531 89631760Supporting figuresScheme S1 Scheme of the gas sensing measurement system and reflectometric test.Fig. S1 FTIR spectrum of GO and graphite.Fig. S2 Absorption (A), transmission (B) and reflectance (C), (D) spectra of the GO film overlaid on a quartz (A), (B), (C) or silicon wafer (D) slide in the UV-vis spectrum. Fig. S3 Absorption of the GO film in air at different concentration varying from 3 mg/mL to 6 mg/mL (a)-(d). (1)-(8) means that repeating 8 times to monitor the change of spectrum and the time?interval is 40 s per times. Fig. S4 Absorption of the GO film in EtOH at different concentration varying from 3 mg/mL to 6 mg/mL (a)-(d). (1)-(8) means that repeating 8 times to monitor the change of spectrum and the time?interval is 40 s per times. Fig. S5 Absorption of the GO film in NH3 at different concentration varying from 3 mg/mL to 6 mg/mL (a)-(d). (1)-(8) means that repeating 8 times to monitor the change of spectrum and the time?interval is 40 s per times. Fig. S6 Absorption of the GO film in H2O at different concentration varying from 3 mg/mL to 6 mg/mL (a)-(d). (1)-(8) means that repeating 8 times to monitor the change of spectrum and the time?interval is 40 s per times. Fig. S7 Absorption of the GO film in MeOH at different concentration varying from 3 mg/mL to 6 mg/mL (a)-(d). (1)-(8) means that repeating 8 times to monitor the change of spectrum and the time?interval is 40 s per times. Fig. S8 Desorption of the GO film in NH3 at different concentration varying from 3 mg/mL to 6 mg/mL (a)-(d). (0)-(2) means that repeating continuous 3 times to monitor the change of spectrum. Fig. S9 Desorption of the GO film in H2O at different concentration varying from 3 mg/mL to 6 mg/mL (A)-(D). (0)-(2) means that repeating continuous 3 times to monitor the change of spectrum. Fig. S10 Desorption of the GO film in MeOH at different concentration varying from 3 mg/mL to 6 mg/mL (a)-(d). (0)-(2) means that repeating continuous 3 times to monitor the change of spectrum. Fig. S11 Maximum reflected wavelength shift (Δλ) and visualized color changes vs. response time of the GO films when it is exposed to EtOH (c = 30 ppm) and switched between adsorption process and desorption process.Table S1 Concentration of EtOH and MeOH under different N2 flow rate.C/ppmV/mL·min-1EtOHMeOH50 mL·min-1-3.33 ppm70 mL·min-1-15 ppm100 mL·min-1-30 ppm130 mL·min-13.33 ppm40 ppm150 mL·min-115 ppm50 ppm180 mL·min-130 ppm70 ppm200 mL·min-150 ppm100 ppm230 mL·min-1100 ppm150 ppm“–” means the concentration of gas is out of the detection limit of the commercial detector. ................
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