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PH-sensitive photoluminescence for aqueous thiol-capped CdTe nanocrystals

机译：PH敏感的光致发光的巯基封端的CdTe纳米晶体的光致发光

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摘要

pH-sensitive photoluminescence (PL) is an important property of aqueous nanocrystals (NCs) towards NCs-based intelligent applications. Previous works mainly focused on the effect of pH during NC growth process on PL of the aqueous NCs. The effect of pH during application process on PL of as-prepared NCs is still not fully understood. In this work, we brought out a general mechanism for the pH-sensitive PL behaviors of as-prepared aqueous CdTe NCs capped by aqueous thiol ligands, such as carboxylic-acid-terminated 3-mercaptopropionic acid (MPA) and thioglycolic acid (TGA) ligands, hydroxyl-terminated 1-thioglycerol (TG) ligands and amine-terminated 2-mercaptoethylamine (MA) ligands. A major contribution of this work is finding the key role of ligand terminal groups in the diffuse process of free Cd-ligand complexes toward NCs. This terminal group effect is the main reason for PL alteration of NCs during pH adjustment process. Besides the terminal group effect, PL of aqueous NCs is also affected by the aggregation effect, the thiol group effect and the counter ion effect. These effects make different contributions to PL of NCs at different pH ranges. By using this mechanism, we successfully explained the complex pH-sensitive PL behaviors of MPA, TGA, TG and MA-capped CdTe NCs
机译：pH敏感的光致发光（PL）是水性纳米晶体（NCs）对于基于NCs的智能应用的重要属性。先前的工作主要集中在NC生长过程中pH值对水性NC的PL的影响。仍未完全了解施药过程中pH值对制备的NC的PL的影响。在这项工作中，我们提出了由水性巯基配体（如羧酸封端的3-巯基丙酸（MPA）和巯基乙酸（TGA））封端的水性CdTe NCs的pH敏感PL行为的一般机理。配体，羟基封端的1-硫甘油（TG）配体和胺封端的2-巯基乙胺（MA）配体。这项工作的主要贡献是发现了配体末端基团在游离Cd-配体络合物向NCs扩散过程中的关键作用。此末端基团效应是在pH调节过程中NC的PL改变的主要原因。除端基效应外，水性NCs的PL还受聚集效应，硫醇基效应和抗衡离子效应的影响。这些影响对不同pH范围的NCs的PL贡献不同。通过使用这种机制，我们成功地解释了MPA，TGA，TG和MA封端的CdTe NCs对pH敏感的PL行为的复杂性

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