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    Shell-Isolated Nanoparticle-Enhanced Luminescence of Metallic Nanoclusters

    Year: 2020

    Journal: Anal. Chem., Volume 92, MAY 19, page 7146–7153

    Authors: Li, M; Yuan, P; Chen, QQ; Lin, LH; Radjenovic, PM; He, YL; Wang, JY; Zhang, FL; Luo, SY; Zheng, NF; Zhang, SJ; Tian, ZQ; Li, JF

    Organizations: NSFCNational Natural Science Foundation of China (NSFC) [21703187, 21925404, 21775127, 21427813]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [20720190044, 20720170102]; MOST [2019YFA0705402]; Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology)

    Metallic nanoclusters (NCs) have molecular-like structures and unique physical and chemical properties, making them an interesting new class of luminescent nanomaterials with various applications in chemical sensing, bioimaging, optoelectronics, light-emitting diodes (LEDs), etc. However, weak photoluminescence (PL) limits the practical applications of NCs. Herein, an effective and facile strategy of enhancing the PL of NCs was developed using Ag shell-isolated nanopartide (Ag SHIN)-enhanced luminescence platforms with tuned SHINs shell thicknesses. 3D-FDTD theoretical calculations along with femtosecond transient absorption and fluorescence decay measurements were performed to elucidate the enhancement mechanisms. Maximum enhancements of up to 231-fold for the [Au7Ag8(C (CBu)-Bu-t)(12)](+) cluster and 126-fold for DNA-templated Ag NCs (DNA-Ag NCs) were achieved. We evidenced a novel and versatile method of achieving large PL enhancements with NCs with potential for practical biosensing applications for identifying target DNA in ultrasensitive surface analysis.
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