State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
Nanoscale. 2018 Oct 18;10(40):19224-19230. doi: 10.1039/c8nr06956e.
In this study, we have developed a programmable electrochemiluminescence (ECL) system based on multi-segmented CdS-Au nanorod arrays with a sequential and highly tunable structure. The nanorod arrays were synthesized by an electrodeposition method using anodic aluminum oxide (AAO) as the template in which the Au and CdS segments were alternately electrodeposited. Compared to pure CdS nanorod arrays, multi-segmented CdS-Au nanorod arrays have showed a better ECL performance, which can be attributed to two factors: the favorable electron transfer and the surface plasma resonance (SPR) effect of the Au segment. On the one hand, we demonstrated that the Au segment can increase the charge transfer rate of CdS, which is beneficial for the ECL process because the generation of the radical state needs to accept electrons and then generate the radical state. On the other hand, the SPR of Au plasmon-induced local electromagnetic field enhancement can increase the radiative decay rate of CdS which makes the ECL process more efficient and lead to a higher ECL intensity. And also, an ECL sensor with multi-segmented CdS-Au nanorod arrays was constructed to detect prostate protein antigen (PSA). This study provides some basis for designing high-performance ECL emission materials and the construction of biosensors.
在本研究中，我们开发了一种基于具有顺序和高度可调结构的分段 CdS-Au 纳米棒阵列的可编程电致化学发光 (ECL) 系统。纳米棒阵列通过使用作为模板的阳极氧化铝 (AAO) 的电沉积方法合成，其中 Au 和 CdS 段被交替电沉积。与纯 CdS 纳米棒阵列相比，分段 CdS-Au 纳米棒阵列表现出更好的 ECL 性能，这可以归因于两个因素：Au 段的有利电子转移和表面等离子体共振 (SPR) 效应。一方面，我们证明 Au 段可以提高 CdS 的电荷转移速率，这有利于 ECL 过程，因为自由基态的生成需要接受电子，然后生成自由基态。另一方面，Au 等离子体激元诱导的局部电磁场增强的 SPR 可以增加 CdS 的辐射衰减速率，使 ECL 过程更有效率，并导致更高的 ECL 强度。此外，还构建了具有分段 CdS-Au 纳米棒阵列的 ECL 传感器来检测前列腺蛋白抗原 (PSA)。本研究为设计高性能 ECL 发射材料和构建生物传感器提供了一些依据。
