10-Fold Quantum Yield Improvement of Ag2S Nanoparticles by Fine Compositional Tuning



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Ortega Rodríguez, Alicia and Shen, Yingli and Zabala Gutiérrez, Irene and Santos, Harrison D. A. and Torres Vera, Vivian and Ximedes, Erving and Villaverde Cantizano, Gonzalo and Lifante, José and Gerke, Christoph and Fernández Monsalve, Nuria and Gómez Calderón, Óscar and Melle Hernández, Sonia and Marqués Hueso, José and Méndez González, Diego and Laurenti, Marco and Jones, Callum M. S. and López Romero, Juan Manuel and Contreras Cáceres, Rafael and Jaque García, Daniel and Rubio Retama, Jorge (2020) 10-Fold Quantum Yield Improvement of Ag2S Nanoparticles by Fine Compositional Tuning. ACS Applied materials and interfaces, 12 (11). pp. 12500-12509. ISSN 1944-8252 (Online) 1944-8244(Print)

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Official URL: https://dx.doi.org/10.1021/acsami.9b22827


Ag2S semiconductor nanoparticles (NPs) are near-infrared luminescent probes with outstanding properties (good biocompatibility, optimum spectral operation range, and easy biofunctionalization) that make them ideal probes for in vivo imaging. Ag2S NPs have, indeed, made possible amazing challenges including in vivo brain imaging and advanced diagnosis of the cardiovascular system. Despite the continuous redesign of synthesis routes, the emission quantum yield (QY) of Ag2S NPs is typically below 0.2%. This leads to a low luminescent brightness that avoids their translation into the clinics. In this work, an innovative synthetic methodology that permits a 10-fold increment in the absolute QY from 0.2 up to 2.3% is presented. Such an increment in the QY is accompanied by an enlargement of photoluminescence lifetimes from 184 to 1200 ns. The optimized synthetic route presented here is based on a fine control over both the Ag core and the Ag/S ratio within the NPs. Such control reduces the density of structural defects and decreases the nonradiative pathways. In addition, we demonstrate that the superior performance of the Ag2S NPs allows for high-contrast in vivo bioimaging.

Item Type:Article
Additional Information:

Received: December 17, 2019
Accepted: February 18, 2020
Published: February 18, 2020

Uncontrolled Keywords:Ag2S/Ag; Nanoparticles; Fluorescence probes; Synthesis optmization; PL lifetime; NIR-II imaging
Subjects:Sciences > Physics > Optics
Medical sciences > Optics > Geometrical and instumental optics
Medical sciences > Optics > Imaging systems
ID Code:59801
Deposited On:04 Apr 2020 17:58
Last Modified:18 Feb 2021 23:00

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