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通过改变石墨/硝酸钠配比和反应时间,合成出氧化石墨烯(GO),探讨最佳的石墨/硝酸钠配比、反应时间来获得氧含量最高的GO以及氧含量对GO的物理化学性质的影响.采用TEM、SEM、AFM、XRD、Raman、FTIR、TGA、UV-vis等仪器对样品进行表征.增加硝酸钠用量,能提高GO的氧含量、比表面积、孔体积和孔径,但降低结晶度.不同反应时间对氧含量无明显影响.随着氧含量的增加,物理化学性质如层间距和缺陷强度增加,而热稳定性降低.不同的石墨/硝酸钠配比和反应时间能改变GO的物理化学性质如氧含量、结晶度、热稳定性和整体形貌.“,”Graphene oxide (GO) was synthesized by the reaction of graphite with sodium nitrate and the graphite/sodium nitrate mass ratio and the reaction time were varied in order to obtain the highest oxygen content.The GO was characterized by TEM, SEM, AFM, XRD, FT-IR, TGA, elemental analysis, and UV-vis and Raman spectroscopy.The effect of oxygen content on the physicochemical properties of GO was investigated.Results indicate that increasing the graphite to sodium nitrate ratio increases the oxygen content, BET surface area, pore volume and pore size but reduces the crystallite size of the GO samples.However, the oxygen content of GO is not directly related to the reaction time.Physicochemical properties such as d-spacing and defect density increase with increasing oxygen content while the thermal stability decreases.The physicochemical properties such as oxygen content, crystallinity, thermal stability and structure can be tailored by varying the graphite/sodium nitrate ratio and reaction time.