Dual Enhancement of Gold Nanocluster Electrochemiluminescence: Electrocatalytic Excitation and Aggregation-Induced Emission
Dual Enhancement of Gold Nanocluster Electrochemiluminescence: Electrocatalytic Excitation and Aggregation-Induced Emission
复制标题
金纳米簇电化学发光的双重增强：电催化激发和聚集诱导发射
DOI：
10.1002/anie.201913445
复制
发表时间：
2019-12-04
影响因子：
16.6
通讯作者：
Liu, Juewen
中科院分区：
文献类型：
--
作者：
Peng, Huaping;Huang, Zhongnan;Liu, Juewen
配体保护的金纳米团簇（AuNCs）由于其有趣的催化和发射性质而成为一类新的电化学发光（ECL）发光体，尽管它们在水介质中的量子产率（phi（ECL））低，并且对ECL过程的机理理解较差。现在，它表明，在电极上干燥AuNCs能够增强电化学激发的电催化效应，并增强发射的聚集诱导ECL（AIECL）的6-氮杂-2-硫代胸腺嘧啶（ATT）保护的AuNCs与三乙胺（TEA）作为共反应物。干燥的ATT-AuNC/TEA系统产生具有78%的phi（ECL）的高度稳定的视觉ECL，并且用甲硫氨酸封端的AuNC也实现了类似的增强。干燥使能的双重增强机制解决了AuNC ECL探针具有挑战性的机理问题，并且可以指导ECL发射极的进一步合理设计。
Ligand-protected gold nanoclusters (AuNCs) have emerged as a new class of electrochemiluminescence (ECL) luminophores for their interesting catalytic and emission properties, although their quantum yield (phi(ECL)) in aqueous medium is low with a poor mechanistic understanding of the ECL process. Now it is shown that drying AuNCs on electrodes enabled both enhanced electrochemical excitation by an electrocatalytic effect, and enhanced emission by aggregation-induced ECL (AIECL) for 6-aza-2-thiothymine (ATT) protected AuNCs with triethylamine (TEA) as a coreactant. The dried ATT-AuNCs/TEA system resulted in highly stable visual ECL with a phi(ECL) of 78 %, and a similar enhancement was also achieved with methionine-capped AuNCs. The drying enabled dual-enhancement mechanism has solved a challenging mechanistic problem for AuNC ECL probes, and can guide further rational design of ECL emitters.