掺氮碳量子点及其发光特性研究
发布时间：2018-10-10 20:30
【摘要】：碳量子点,是一种类球形且尺寸在1 0 n m以下的碳纳米颗粒。由于碳量子点具有良好的水溶性、化学惰性、易于功能化、抗光漂白性和低毒性等优异性能。碳量子点的荧光强度很高,又被称作“荧光碳量子点”,且具有光引发电子转移的行为,具有替代传统昂贵有毒的重金属在生物医学、光电器件上的应用潜力,引起了广泛关注。最近掺杂或者尺寸控制的功能化的碳量子点有望应用于更多的光电器件上,如有机光电二极管、光伏器件、生物成像等相关应用。本文开展了基于制备掺氮碳量子点及其荧光特性的研究。用化学法合成了掺氮碳量子点,并讨论了其形成机理和荧光特性。获得了以下主要结果:(1)采用非配位溶剂十八烯提供高温液相环境将一水柠檬酸和十八胺反应制备掺氮碳量子点,并探究和描述了其形成机理。十八胺和柠檬酸首先脱水反应生成含有酰胺键的长链分子前驱物,高温条件下这些前驱物逐渐聚集、转化成跨链酰亚胺从而形核,同时外部的烷烃链逐渐消耗形核加剧,最终形成碳量子点。同时研究了温度改变对掺氮碳量子点的影响确认其形成机理的分析,发现随着反应温度的升高粒度逐渐减小、含氮量逐渐升高、发光红移。最后利用3 0 0℃合成的N-C N D s,制备了结构为I T O/N-C N D s(3 0 0℃)/A l的单层发光器件。(2)研究了碳源的改变对掺氮碳量子点样品光学性质的影响。对比讨论了具有不同链长的有机胺(十八胺和十六胺)以及不同性质碳源(无水柠檬酸和一水柠檬酸)所获得的碳量子点的系列光谱,发现链长较短趋于获得粒度更小、含氮比例更高、发光红移的碳量子点,说明可以通过有机胺链的长短来实现发光的调控。
[Abstract]:Carbon quantum dots (QDs) are a kind of spherical carbon nanoparticles with sizes below 10 nm. Carbon quantum dots have excellent properties such as good water solubility, chemical inertia, easy functionalization, photobleaching resistance and low toxicity. The fluorescence intensity of carbon quantum dots is very high, also known as "fluorescent carbon quantum dots", and has photoinduced electron transfer behavior, which has the potential to replace traditional expensive toxic heavy metals in biomedicine and optoelectronic devices. Has aroused widespread concern. Recently, functionalized carbon quantum dots doped or dimensionally controlled are expected to be used in more optoelectronic devices, such as organic photodiodes, photovoltaic devices, biological imaging and other related applications. In this paper, the preparation of nitrogen-doped carbon quantum dots and their fluorescence properties have been studied. Nitrogen and carbon doped quantum dots were synthesized by chemical method and their formation mechanism and fluorescence characteristics were discussed. The main results are as follows: (1) Nitrogen-doped carbon-doped quantum dots were prepared by the reaction of citric acid monohydrate with octadecylamine in a high temperature liquid environment by using non-coordinated solvent octadecene, and the formation mechanism was investigated and described. Octadecylamine and citric acid first dehydrated to form long-chain molecular precursors containing amide bonds, which gradually accumulated at high temperature and transformed into transchain imide, thus nucleating, while the external alkane chain gradually consumed and nucleated. Finally, carbon quantum dots are formed. At the same time, the influence of temperature on the formation mechanism of nitrogen-doped carbon quantum dots was studied. It was found that with the increase of reaction temperature, the particle size decreased, nitrogen content gradually increased, and red shift of luminescence was observed. Finally, a monolayer luminescent device with I T O/N-C N D s (300 鈩，
本文编号：2263141
[Abstract]:Carbon quantum dots (QDs) are a kind of spherical carbon nanoparticles with sizes below 10 nm. Carbon quantum dots have excellent properties such as good water solubility, chemical inertia, easy functionalization, photobleaching resistance and low toxicity. The fluorescence intensity of carbon quantum dots is very high, also known as "fluorescent carbon quantum dots", and has photoinduced electron transfer behavior, which has the potential to replace traditional expensive toxic heavy metals in biomedicine and optoelectronic devices. Has aroused widespread concern. Recently, functionalized carbon quantum dots doped or dimensionally controlled are expected to be used in more optoelectronic devices, such as organic photodiodes, photovoltaic devices, biological imaging and other related applications. In this paper, the preparation of nitrogen-doped carbon quantum dots and their fluorescence properties have been studied. Nitrogen and carbon doped quantum dots were synthesized by chemical method and their formation mechanism and fluorescence characteristics were discussed. The main results are as follows: (1) Nitrogen-doped carbon-doped quantum dots were prepared by the reaction of citric acid monohydrate with octadecylamine in a high temperature liquid environment by using non-coordinated solvent octadecene, and the formation mechanism was investigated and described. Octadecylamine and citric acid first dehydrated to form long-chain molecular precursors containing amide bonds, which gradually accumulated at high temperature and transformed into transchain imide, thus nucleating, while the external alkane chain gradually consumed and nucleated. Finally, carbon quantum dots are formed. At the same time, the influence of temperature on the formation mechanism of nitrogen-doped carbon quantum dots was studied. It was found that with the increase of reaction temperature, the particle size decreased, nitrogen content gradually increased, and red shift of luminescence was observed. Finally, a monolayer luminescent device with I T O/N-C N D s (300 鈩，
本文编号：2263141
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