电化学法制备碳量子点及其应用研究

发布时间：2018-02-15 19:26

本文关键词： 碳量子点电化学法铁离子检测细胞成像　出处：《青岛大学》2017年硕士论文　论文类型：学位论文

【摘要】：碳量子点(Carbon quantum dots,CQDs)是近十年发展起来的碳纳米材料,尺寸在10 nm以下,在水介质中具有非常好的分散性、化学惰性高、低的细胞毒性、表面基团容易功能化、抗光漂白性、光稳定性高等优异性能,是碳纳米家族中的冉冉升起的一颗耀眼的明星。通过研究者的不断深入的研究,最近几年的研究报道了越来越多的碳量子点的应用涉及到生物成像方面、电光催化、光伏电池、生物-化学传感器等诸多领域。这些都说明碳量子点具有非常重要的潜在的应用价值。随着研究的不断深入合成碳量子点的方法越来越多,包括电化学法、水热法、微波法等等。然而复杂的合成过程以及必须用含有碳源的材料做电极才能制备碳量子点。本文主要研究了碳量子点的两种制备方法及其在铁离子检测和细胞成像方面的应用。第一种方法是,我们发明了基于一种使用不含碳的电极的电化学方法来制备固体量子点。乙腈和少量的离子液体混合液作为电解液,两个铂片电极作正负极,在10 V的恒电压下12小时即可得到固体的碳量子点。这种方法所制备的碳量子点,避免了后期复杂的提纯过程,直接真空抽滤,并在真空干燥箱里60摄氏度干燥1个小时即可得到纯净的固体量子点。第二种方法是简单高效的自下而上的电化学方法以氨基酸最为前躯体来制备多功能的氮掺杂的碳量子。基于三电极电化学分析体系,不仅可以得到水溶性较好,荧光强度较高电化学的发光稳定的氮掺杂的碳量子溶液,而且还直观的通过电流电压曲线可以得到最大的量子产率。通过高分辨投射电镜、原子力显微镜、傅里叶红外光谱以及X射线光电子能谱分析等对两种方法得到的碳量子点进行了全面系统的表征,结果表明得到的碳量子点表面含有丰富的含氧官能团羧基和羟基,因此具有极好的水溶性,以及优良的荧光特性。
[Abstract]:Carbon quantum dots (Carbon quantum, dots, CQDs) is the carbon nano materials developed in recent ten years, the size below 10 nm in aqueous medium has good dispersion, high chemical inertness, low cytotoxicity, easily functionalized surface groups, anti photobleaching, light stability and high performance is the family of carbon nano, the rising of a dazzling star. Through the in-depth research of the researchers, research in recent years reported the application of carbon quantum dots are more and more involved in biological imaging, electro catalysis, photovoltaic cells, bio - chemical sensor fields. These are examples of carbon quantum dots have important potential application value. With the deepening of the research methods of synthesis of carbon quantum dots is more and more, including electrochemical method, hydrothermal method, microwave method and so on. However, the process of compounding and must contain carbon The source electrode material to prepare carbon quantum dots. This paper mainly studies two methods of preparation of carbon quantum dots and its application in iron ion detection and cell imaging. The first method, we developed a method of electrochemical electrode using carbon based solid preparation of quantum dots. A mixture of acetonitrile and ionic liquids as electrolyte, two platinum electrode as anode, at a constant voltage of 10 V 12 hours to get a solid carbon quantum dots. This method of carbon quantum dots prepared by the process of purification, avoid complex post, direct vacuum filtration, and a vacuum drying box in 60 degrees Celsius dry for 1 hours to obtain a solid quantum dot. The second method is pure carbon quantum electrochemistry method is simple and efficient bottom-up with the precursor amino acids to nitrogen doped multi function. Based on the three electrode The electrochemical analysis system, not only can get better water solubility and high carbon quantum fluorescence electrochemical luminescence stability of nitrogen doping, but also directly through the current voltage curve can be obtained. The maximum quantum yield by high resolution transmission electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy and X ray photoelectron carbon quantum by the two methods of spectrum analysis were characterized systematically, the results showed that the surface of carbon quantum dots obtained with oxygen functional groups of carboxyl and hydroxyl containing abundant, so it has excellent water solubility and excellent fluorescent properties.

【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.1;O613.71

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