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[求助]
制备石墨烯量子点为什么要先还原GO，再氧化？
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RT。GSs were obtained by thermal deoxidization of GO sheets in a tube furnace at 200–300 8C for 2 h with a heating rate of 5 8C min1 in a nitrogen atmosphere. GSs (0.05 g) were oxidized in concentrated H2SO4 (10 mL) and HNO3 (30 mL) for 15–20 h under mild ultrasonication (500 W, 40 kHz). The mixture was then diluted with deionized (DI) water (250 mL) and filtered through a 0.22-mm microporous membrane to remove the acids. Purified oxidized GSs (0.2 g) were re-dispersed in DI water (40 mL) and the pH was tuned to 8 with NaOH. The suspension was transferred to a poly(tetrafluoroethylene) (Teflon)-lined autoclave (50 mL) and heated at 200 8C for 10 h. 如上，先还原的目的是什么，我可以直接用GO来做（不还原）吗？ |
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