新型低维碳材料的合成及其光学性质研究

发布时间：2018-04-16 10:08

本文选题：低维材料 + 石墨烯量子点　；参考：《兰州大学》2015年硕士论文

【摘要】：本论文所涉及的研究工作围绕低维碳材料的合成与应用展开。首先探索了了石墨烯量子点的合成及其在生物成像、光电转换领域的应用。在此基础上,将工作拓展到碳化钛纳米片的合成与表征,并探讨了其在非线性光学领域的应用。主要研究内容包括：1.提出了一种方便新颖的具有普遍适用性的石墨烯量子点制备方法。通过在固相条件下使用不同化学组成的有机小分子作为前体来合成不同化学掺杂的石墨烯量子点。该方法制得的石墨烯量子点具有荧光量子产率高、酸碱耐受性强、细胞毒性低等优势,这使得其在有望在生物标记和光电应用等领域发挥重要作用。同时证明,这种石墨烯量子点的制备方法可以广泛应用于各种反应前体,开创了一种合理设计、低成本生产不同掺杂石墨烯量子点的新方法。2.利用琼脂糖凝胶电泳技术有效地分离纯化了石墨烯量子点和碳量子点。并对分离纯化产物进行了系统的表征,进而对固相法热解小分子制备石墨烯量子点的机理进行了确认,另一方面也探究了各个组分的荧光性质。3.用简易可行的溶液超声辅助分散法制备了一种新型的二维材料TiC纳米片。并研究了该材料在532 nm波长激光下的非线性光学性质。Z-扫描结果显示相比于MoS2, TiC纳米片展现出更加吸引人的饱和吸收性质。研究表明,以ITO为基底,通过电沉积方法制备的TiC/ITO复合物可以作为一类新型的具有极大应用潜力的非线性光学材料。
[Abstract]:This paper focuses on the synthesis and application of low-dimensional carbon materials.Firstly, the synthesis of graphene quantum dots and their applications in the field of biological imaging and photoelectric conversion are explored.On this basis, the work is extended to the synthesis and characterization of titanium carbide nanocrystals, and its application in nonlinear optics is discussed.The main research contents include: 1.A novel and convenient method for the preparation of graphene quantum dots with universal applicability is proposed.Different chemically doped graphene quantum dots were synthesized by using organic small molecules with different chemical composition as precursors under solid state conditions.The graphene quantum dots prepared by this method have the advantages of high fluorescence quantum yield, strong acid-base tolerance and low cytotoxicity, which make them play an important role in biomarker and optoelectronic applications.At the same time, it is proved that the preparation method of graphene quantum dots can be widely used in various reaction precursors, and a new method of producing different doped graphene quantum dots with reasonable design and low cost has been created.Graphene quantum dots and carbon quantum dots were effectively separated and purified by agarose gel electrophoresis.The mechanism of preparing graphene quantum dots by solid phase pyrolysis of small molecules was confirmed. On the other hand, the fluorescence properties of each component were also investigated.A new two-dimensional TiC nanocrystalline was prepared by a simple and feasible solution ultrasonic assisted dispersion method.The nonlinear optical properties of the material at 532nm laser. Z- scanning results show that the TiC nanocrystals exhibit more attractive saturated absorption properties than those of MoS2.The results show that the TiC/ITO composite prepared by electrodeposition on ITO substrate can be used as a new type of nonlinear optical material with great application potential.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ127.11

【共引文献】