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Shell-Isolated Nanoparticle-Enhanced Luminescence of Metallic Nanoclusters.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-04-28 , DOI: 10.1021/acs.analchem.0c00600
Mei Li 1, 2 , Peng Yuan 1 , Qing-Qi Chen 1 , Long-Hui Lin 1 , Petar M Radjenovic 1 , Yong-Lin He 1 , Jing-Yu Wang 1 , Fan-Li Zhang 1 , Shi-Yi Luo 1 , Nan-Feng Zheng 1 , San-Jun Zhang 3 , Zhong-Qun Tian 1 , Jian-Feng Li 1
Affiliation  

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 nanoparticle (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≡CtBu)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.

中文翻译:

壳隔离的纳米粒子增强了金属纳米团簇的发光。

金属纳米团簇(NCs)具有分子状结构以及独特的物理和化学特性,使其成为一类有趣的新型发光纳米材料,在化学传感,生物成像,光电,发光二极管(LED)等方面具有各种应用。光致发光(PL)限制了NC的实际应用。在本文中,使用具有可调的SHIN壳厚度的Ag壳隔离纳米颗粒(Ag SHIN)增强的发光平台,开发了一种有效且简便的增强NCs PL的策略。进行了3D-FDTD理论计算以及飞秒瞬态吸收和荧光衰减测量,以阐明增强机制。对于[Au7Ag8(C≡CtBu)12] +簇,最大增强了231倍,对于DNA模板化的Ag NCs(DNA-Ag NCs)则达到了126倍。我们证明了一种新颖且通用的方法,可通过NC实现大的PL增强,具有在实际生物传感应用中识别超敏感表面分析中的目标DNA的潜力。
更新日期:2020-04-16
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