生物质基氮掺杂碳量子点的制备及其荧光性能研究

发布时间：2018-02-26 11:26

本文关键词： 碳量子点 Hg~(2+)检测固相热解荧光薄膜　出处：《郑州大学》2016年硕士论文　论文类型：学位论文

【摘要】：碳量子点是一种新型的荧光碳纳米材料,其颗粒尺寸在10 nm以下,由于碳量子点具有独特的激发波长可协调性、生物相容性、低的细胞毒性等特征,其在荧光成像、离子检测、生物传感等方面有着广阔的应用前景。本文以碳量子点新的制备方法为对象展开研究,以不同原料作为碳的前驱体,采用不同的制备方法得到荧光性能优越的氮掺杂碳量子点,并对其荧光性质、形貌、结构、应用等进行探索,主要研究内容如下:第一部分,以微晶纤维素为制备原料,采用固相热解的制备方法,使纤维素在氨气气氛中直接碳化、热解制备氮掺杂的碳量子点(N-CQDs1),并探索反应时间、反应温度对N-CQDs1制备的影响。所得N-CQDs1具有较好的水溶性、激发波长依赖性、抗光漂白性、pH稳定性等。实验中发现Hg~(2+)可以有效的淬灭N-CQDs1,对其表现出了较好的选择性。碳量子点作为Hg~(2+)纳米探针,其检测限为7.7 nM,此结果低于美国环境署规定的最低检测限10 nM。第二部分,首次以怀山药为碳源,加入饱和硫酸铵溶液,采用水热的方法制备氮掺杂的荧光碳量子点(N-CQDs2)。考察了各制备条件对于碳量子点荧光性能的影响,结果表明,在反应温度为200°C、时间为12 h、怀山药用量为15 g时,所得氮掺杂碳量子点的性能最佳。同时探讨了碳量子点在防伪识别和荧光薄膜中的应用。本文所提出的碳量子点制备方法,具有原料易得、成本较低、易于规模化制备,过程碳化程度高、产品应用领域专一等特点。制备方法鲜见文献报道,有一定创新性。在碳量子点的多样化制备方面具有一定的参考价值。
[Abstract]:Carbon quantum dots (QDs) are novel fluorescent carbon nanomaterials with particle size below 10 nm. Because of their unique characteristics of excitation wavelength compatibility, biocompatibility and low cytotoxicity, carbon quantum dots are used in fluorescence imaging and ion detection. In this paper, the new preparation method of carbon quantum dots is studied, and different raw materials are used as precursors to obtain nitrogen-doped carbon quantum dots with excellent fluorescence properties. The fluorescence properties, morphology, structure and application of microcrystalline cellulose were investigated. The main contents were as follows: in the first part, the cellulose was directly carbonized in ammonia atmosphere by solid phase pyrolysis. N-doped carbon quantum dots (N-CQDs1) were prepared by pyrolysis. The effects of reaction time and reaction temperature on the preparation of N-CQDs1 were investigated. The N-CQDs1 was water-soluble and excited wavelength dependent. It is found that Hg~(2) can effectively quench N-CQDs1 and exhibit good selectivity. Carbon quantum dots are used as Hg~(2 nanoprobes. The detection limit is 7.7 nm, which is lower than the minimum detection limit of 10 nm. The second part uses Dioscorea yam as carbon source to add saturated ammonium sulfate solution for the first time. N-doped carbon quantum dots N-CQDs2 were prepared by hydrothermal method. The effects of preparation conditions on the fluorescence properties of carbon quantum dots were investigated. The results showed that the reaction temperature was 200 掳C, the time was 12 h, and the dosage of Dioscorea yam was 15 g. At the same time, the application of carbon quantum dots in anti-counterfeiting recognition and fluorescence thin film is discussed. The preparation method of carbon quantum dots proposed in this paper is easy to obtain raw materials, low cost and easy to be prepared on a large scale. The preparation method is rarely reported in literature and has some innovation. It has certain reference value in the diversification of preparation of carbon quantum dots.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O657.3;O613.71

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