【作者】 李玲；

【导师】 朱昌青；

【作者基本信息】 安徽师范大学 ， 分析化学， 2006， 硕士

【摘要】 InP和Bi2S3量子点因其具有独特的光学性质和毒性小等优点,业已引起人们的关注。有关InP和Bi2S3量子点的制备及性质研究已有较多报道,但其在分析应用方面的报道还很少。我们参照文献自制了InP和Bi₂S₃量子点,通过XRD和TEM对其进行了表征,并用光谱手段研究了其光谱性质。实验表明,InP和Bi2S3量子点表面被含有水溶性的基团修饰后,稳定性和水溶性增加,可用于某些生物分子或金属离子的分析检测。此项研究进一步拓展了InP和Bi2S3量子点在分析领域的应用。本论文共分六章,具体内容如下:第一章为绪论。首先回顾了量子点的性质及分析应用的研究进展,接下来介绍了InP和Bi2S3量子点的研究现状,最后结合本实验室条件提出论文工作设想。第二章叙述了InP量子点的合成、表征及光谱行为。以Na、P和InCl₃为原料,制备的不同粒径的InP量子点,经过HF刻蚀后获得了高的荧光量子产率,体系pH对其发光效率的影响非常明显。第三章考察了InP量子点与重金属离子和表面活性剂的作用,研究了实验条件对荧光性质变化的影响,探讨了作用机理。实验结果发现Hg2+,Ag+能使量子点荧光强度明显淬灭,并导致光谱峰位的移动。SDBS能增强量子点的荧光发射强度,而且峰位有一定的蓝移。Trion X-100能明显地淬灭量子点的荧光,并且伴随着峰位蓝移。第四章制备了InP/PAA功能化纳米粒子,考察了酸度对其光谱性质的影响,研究了其与重金属离子的相互作用,初步探讨了作用机理。第五章介绍了InP/MAA功能化纳米粒子的制备,研究了其在重金属离子存在下的发光行为,实现了对Hg2+的近红区测定。第六章介绍了在表面活性剂聚乙二醇（PEG-400）存在下,Bi₂S₃纳米粒子的合成。该纳米粒子具有较好的水溶性和稳定性,Hg²⁺和Cu²⁺的加入能显著增强Bi₂S₃纳米粒子的共振光散射强度,由此建立了灵敏度较高和选择性较好的Hg²⁺,Cu²⁺测定方法,并给出了机理解释。更多还原

【Abstract】 InP and Bi2S3 QDs have particular optical properties and little toxicity, which have aroused people’s attention. There are many reports about synthesis and properties of InP and Bi2S3 QDs, but little use in the analytical chemistry at present. In the thesis, InP and Bi2S3 QDs were synthesized and characterized by XRD,TEM and their optical properties. Being functionalized with–COOH or–NH2, the functionalized nanoparticles show high fluorescence efficiency and water solubility and stability. The functional QDs have potential use for many analytical missions. The thesis is consists of five chapters, including the following main contents respectively:In chapter 1, the basic conception and applications of QDs were firstly introduced. Then, research reports and status of InP and Bi2S3 QDs were investigated and summarized. Finally, the research proposal for this thesis is presented.In chapter 2, InP QDs were synthesized and characterized by TEM, XRD and optical behaviors. InP QDs have been synthesized by the direct reaction of Na、P and InCl3 with different reaction condition. InP QDs being etched by HF exhibited dissimilar optical properties. PH had a great effect on the fluorescence intensity of InP QDs.In chapter 3, the spectral behaviors of InP QDs in the presence of surfactants and heavy metal ions were studied, and the mechanisms were also discussed. When an amount of Hg2+ and Ag+ added, fluorescence intensity decreased. In the presence of anionic surfactant SDBS, the fluorescence emission enhanced noticeably, with blue shift. Fluorescence emission quenched dramatically in the presence of Triton X-100, with blue shift.In chapter 4, functionalized InP/ PAA nanoparticles have been prepared by an in-situ polymerization method. pH and heavy metal ions influenced the spectral behaviors sharply, and the likely mechanisms of fluorescence spectral更多还原