【作者】 刘明洋； 王坤； 汪林夕； 范红松； Nelson Rowell； John A.Ripmeester； 余睽；

【Author】 Mingyang Liu;Kun Wang;Linxi Wang;Hongsong Fan;Nelson Rowell;John A.Ripmeester;Kui Yu;Institute of Atomic and Molecular Physics, Sichuan University;

【机构】 四川大学原子与分子物理研究所； 国家生物医学材料工程研究中心； National Research Council of Canada；

【摘要】 胶体半导体量子点纳米晶的形成过程包括了数步复杂的化学反应,但是由于量子点合成过程中反应速度快,中间体难以检测等难题,量子点形成机理的研究仍然相当匮乏。我们以碲化镉为模型体系,通过合成条件的控制,"观察"量子点成核生长前的"诱导期",即存在前驱体的消耗但无量子点的生成的时期^[1]。利用¹¹³Cd和³¹P核磁共振对诱导期的反应进行检测,并对诱导期中可能存在的中间体进行"表达",利用原位紫外吸收来观察。研究诱导期可能存在的中间体,从而推导幻数量子点形成的可能的机理^[2]。此合成和检测的新方法适用于其他胶体半导体量子点体系,是研究幻数纳米晶形成机理的普适方法。更多还原

【Abstract】 The formation of colloidal quantum dots（QDs） contains serval stages enriched with complicated chemical reactions. Prior to nucleation and growth of QDs, there exists one "induction period" with the consumption of precursors. Little has been know about the chemical reactions in this stage. To capture the intermediates formed in this stage is significantly challenging due to the fast reaction rates. With CdT e as a model system, we have optimized its synthetic condition to study its "induction period". ¹¹³ Cd and ³¹ P NMR was performed to monitor the reactions; furthermore, efforts were directed to "express" the probable intermediates existing to be observed by absorption spectroscopy. Our strategy developed is general.更多还原