溶剂对石墨烯量子点荧光性质的影响 |
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引用本文: | 姬子晔,张海明,吴磊,白小刚,黄丹.溶剂对石墨烯量子点荧光性质的影响[J].发光学报,2016(9):1031-1036. |
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作者姓名: | 姬子晔 张海明 吴磊 白小刚 黄丹 |
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作者单位: | 天津工业大学 理学院,天津,300387 |
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基金项目: | 国家自然科学基金(61274064) |
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摘 要: | 采用柠檬酸热解法制备了石墨烯量子点(GQDs),研究了非极性溶剂戊烷,极性溶剂乙醇、丙酮、乙二醇对GQDs荧光性质的影响。透射电子显微镜(TEM)和原子力显微镜(AFM)图像表明,制备的GQDs尺寸分布在2~12 nm(平均尺寸为4.9 nm),分散均匀,高度分布在0.5~2 nm。吸收光谱表明,GQDs具有明显的紫外吸收特性,吸收峰位于259 nm和274 nm。光致发光谱表明,GQDs的发光具有明显的溶剂依赖性。GQDs在极性溶剂乙醇、丙酮、乙二醇中,发光峰的位置依赖于激发波长,发射波长在可见光区。而在非极性溶剂戊烷中,GQDs表现出对激发波长不依赖的荧光性能,且发射波长在近紫外。
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关 键 词: | 石墨烯量子点 光致发光 溶剂依赖性 激发依赖性 |
Effects of Solvent on Luminescent Properties of GQDs |
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Abstract: | The graphene quantum dots( GQDs) were prepared by pyrolyzing citric acid and dissolved with different organic solvents. The influence of solvent on luminescence properties is investigated. Transmission electron microscope( TEM) , along with atomic force microscope( AFM) was employed for the morphology and structure analysis of the as-prepared samples. The results show that GQDs??diameters are distributed in the range of 2-12 nm(4. 9 nm average diameter). Optical properties of the as-prepared samples were characterized by ultraviolet-visible spectra( UV-Vis) and fluorescence spectrophotometer . The photoluminescence spectra depict that the GQDs exhibited solvent-dependent behaviors. The position of the peak fluorescence of GQDs in polar solvent ethanol, acetone and eth-ylene glycol is dependent on excitation wavelength, emission wavelength is in a visible light area. The fluorescence of GQDs in a nonpolar solvent pentane is independent of excitation wavelength, the strong emission appeared in the near-UV region. |
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Keywords: | graphene quantum dots(GQDs) photoluminescence solvent dependence excitation dependence |
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