%0 Journal Article
%A Ruiz, Diego
%A Mizrahi, Martín
%A Santos, Harrison D. A.
%A Jaque, Daniel
%A Jones, Callum M. S.
%A Marqués-Hueso, José
%A Jacinto, Carlos
%A Requejo, Félix, G. 
%A Torres Pardo, María De La Almudena
%A González Calbet, José María
%A Juárez, Beatriz H. 
%T Synthesis and characterization of Ag2S and Ag2S/Ag2(S,Se) NIR nanocrystals
%D 2019
%@ 2040-3364
%@ 2040-3372
%U https://hdl.handle.net/20.500.14352/107267
%X Syntheses of metal sulfide nanocrystals (NCs) by heat-up routes in the presence of thiols yield NC arrangements difficult to further functionalize and transfer to aqueous media. By means of different NMR techniques, and exemplified by Ag2S NCs, a metal–organic polymer formed during the synthesis acting as a ligand has been identified to be responsible for such aggregation. In this work, a new synthetic hot-injection strategy is presented to synthesize Ag2S NCs which are easily ligand exchangeable in water. Furthermore, the hot-injection route allows an extra NC treatment with Se to produce Ag2S/Ag2(S,Se) NCs with improved optical properties with respect to the Ag2S cores, and better resistance to oxidation, as demonstrated by X-ray absorption experiments.
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