【摘要】：碳量子點,是一種類球形且尺寸在1 0 n m以下的碳納米顆粒。由于碳量子點具有良好的水溶性、化學(xué)惰性、易于功能化、抗光漂白性和低毒性等優(yōu)異性能。碳量子點的熒光強度很高,又被稱作“熒光碳量子點”,且具有光引發(fā)電子轉(zhuǎn)移的行為,具有替代傳統(tǒng)昂貴有毒的重金屬在生物醫(yī)學(xué)、光電器件上的應(yīng)用潛力,引起了廣泛關(guān)注。最近摻雜或者尺寸控制的功能化的碳量子點有望應(yīng)用于更多的光電器件上,如有機光電二極管、光伏器件、生物成像等相關(guān)應(yīng)用。本文開展了基于制備摻氮碳量子點及其熒光特性的研究。用化學(xué)法合成了摻氮碳量子點,并討論了其形成機理和熒光特性。獲得了以下主要結(jié)果:(1)采用非配位溶劑十八烯提供高溫液相環(huán)境將一水檸檬酸和十八胺反應(yīng)制備摻氮碳量子點,并探究和描述了其形成機理。十八胺和檸檬酸首先脫水反應(yīng)生成含有酰胺鍵的長鏈分子前驅(qū)物,高溫條件下這些前驅(qū)物逐漸聚集、轉(zhuǎn)化成跨鏈酰亞胺從而形核,同時外部的烷烴鏈逐漸消耗形核加劇,最終形成碳量子點。同時研究了溫度改變對摻氮碳量子點的影響確認(rèn)其形成機理的分析,發(fā)現(xiàn)隨著反應(yīng)溫度的升高粒度逐漸減小、含氮量逐漸升高、發(fā)光紅移。最后利用3 0 0℃合成的N-C N D s,制備了結(jié)構(gòu)為I T O/N-C N D s(3 0 0℃)/A l的單層發(fā)光器件。(2)研究了碳源的改變對摻氮碳量子點樣品光學(xué)性質(zhì)的影響。對比討論了具有不同鏈長的有機胺(十八胺和十六胺)以及不同性質(zhì)碳源(無水檸檬酸和一水檸檬酸)所獲得的碳量子點的系列光譜,發(fā)現(xiàn)鏈長較短趨于獲得粒度更小、含氮比例更高、發(fā)光紅移的碳量子點,說明可以通過有機胺鏈的長短來實現(xiàn)發(fā)光的調(diào)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，

本文編號：2263141