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Fabrication of Noncoplanar Molecule Aggregates with Inherent Porous Structures for Electrochemiluminescence Signal Amplification
Analytical Chemistry ( IF 7.4 ) Pub Date : 2017-09-06 00:00:00 , DOI: 10.1021/acs.analchem.7b02921
Xiaocen Zhao 1 , Wenjuan Zhou 2 , Chao Lu 1
Affiliation  

A simple and time-saving strategy was developed for the amplification of electrochemiluminescence (ECL) by dropping the noncoplanar tetraphenylethylene (TPE) solution on the surface of gold electrode. The self-assembled TPE aggregates exhibited inherent porous structures, endowing them with high specific surface area and oxygen adsorption capability. Therefore, the fabricated porous structures could lead to a 50-fold increase in the ECL signal of luminol in neutral aqueous solution, in comparison to that on the bare electrode. In contrast, the aggregates of the two typical coplanar polycyclic aromatic hydrocarbons (PAHs), perylene and pyrene, gave a weaker ECL enhancement, owing to their disc-like molecular structure and densely packed layers under aggregated conditions. The proposed ECL system has been successfully applied for the detection of hydrogen peroxide (H2O2) in the linear range of 0.25–1000 μM with a detection limit (S/N = 3) of 0.1 μM. Our findings provide inspiration for revealing the role of inherent molecular structure in the aggregate configuration, and they provide attractive perspectives for the usage of noncoplanar molecules in analytical applications.

中文翻译:

具有固有多孔结构的非共面分子聚集体的制备,用于电化学发光信号放大

通过将非共平面四苯基乙烯(TPE)溶液滴在金电极表面上,开发了一种简单而省时的策略来放大电化学发光(ECL)。自组装的TPE聚集体表现出固有的多孔结构,赋予它们高比表面积和氧吸附能力。因此,与裸电极相比,所制造的多孔结构可能导致中性水溶液中鲁米诺的ECL信号增加50倍。相反,由于两种典型的共平面多环芳烃(PAH)(per和and)的聚集体,由于其盘状分子结构和在聚集条件下的致密堆积层,因此其ECL增强作用较弱。2 O 2)在0.25–1000μM的线性范围内,检出限(S / N = 3)为0.1μM。我们的发现为揭示固有分子结构在聚集构型中的作用提供了启发,并且为非共面分子在分析应用中的使用提供了诱人的见解。
更新日期:2017-09-06
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