Plasmon‐Enhanced Electrochemiluminescence at the Single‐Nanoparticle Level. Issue 2 (2nd December 2022)

• Record Type: Journal Article
• Authors: Wei, Ying; Zhang, Yuchen; Pan, Jiahao; Chen, Tian; Xing, Xing; Zhang, Weihua; Lu, Zhenda
• Is Part Of: Angewandte Chemie international edition. Volume 62:Issue 2(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-02
• Subjects: Electochemiluminescence -- Localized Surface Plasmon Resonance -- Microscopy -- Nanoparticles -- Single-Particle Detection; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202214103
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Plasmon‐enhanced electrochemiluminescence (ECL) at the single‐nanoparticle (NP) level was investigated by ECL microscopy. The Au NPs were assembled into an ordered array, providing a high‐throughput platform that can easily locate each NP in sequential characterizations. A strong dependence of ECL intensity on Au NP configurations was observed. We demonstrate for the first time that at the single‐particle level, the ECL of Ru(bpy)3 2+ ‐TPrA was majorly quenched by small Au NPs (<40 nm), while enhanced by large Au ones (>80 nm) due to the localized surface plasmon resonance (LSPR). Notably, the ECL intensity was further increased by the coupling effect of neighboring Au NPs. Finite Difference Time Domain (FDTD) simulations conformed well with the experimental results. This plasmon enhanced ECL microscopy for arrayed single NPs provides a reliable tool for screening electrocatalytic activity at a single particle. Abstract : An array of well‐controlled Au single particles or oligomers was printed on an electrode surface, and used as a high‐throughput platform to investigate the plasmon enhanced electrochemiluminescence (ECL) at the single‐nanoparticle level. This ECL microscopy can visualize and quantify the electrochemical reactions of multiple individual NPs from wide‐field imaging simultaneously.