Journal
NANOSCALE
Volume 11, Issue 18, Pages 9194-9200Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr02087j
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Funding
- Spanish Ministry of Economy and Competitiveness [MAT2016-75362-C3-1-R, FIS2015-67367-C2-1-P, MAT2017-85617-R]
- Comunidad Autonoma de Madrid [B2017/BMD-3867RENIM-CM]
- Spanish Ministry of Economy and Competitiveness, through the Maria de Maeztu (IFIMAC) Programme for Units of Excellence in RD
- Spanish Ministry of Economy and Competitiveness, through Severo Ochoa (IMDEA Nanoscience) Programme for Units of Excellence in RD
- CAPES (Coordenadoria de Aperfeicoamento de Pessoal de Ensino Superior, Brazil)
- PDSE-CAPES program developed at Universidad Autonoma de Madrid, Spain [88881.134486/2016-01]
- CNPq (Conselho Nacional de Densenvolvimento Cientifico e Tecnologico, Brazil) [304967/2018-1]
- Laboratorio Nacional de Luz Sincrotron, Campinas, Brazil [XAFS2 20170359, SXS-20180281]
- CONICET
- ANPCYT [PICT 2015-2285]
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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/Ag-2(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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