Syntheses of metal sulfide nanocrystals (NCs) by heat-up routes in the presence of thiols yield NCs arrangements difficult to further functionalize and transfer to aqueous media. By means of different NMR techniques, and exemplified in Ag2S NCs, a metal-organic polymer formed during the synthesis acting as ligand has been identified as responsible for such aggregation. In this work a new synthetic hot-injection strategy is presented to synthesize Ag2S NCs easily ligand exchangeable into water. Furthermore, the hot-injection route allows an extra NCs 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.
ASJC Scopus subject areas
- Materials Science(all)
Ruiz, D., Mizrahi, M., Santos, H. D., Jaque, D., Jones, C., Marques-Hueso, J., Jacinto, C., Requejo, F. G., Torres-Pardo, A., González-Calbet, J. M., & Juárez, B. H. (2019). Synthesis and characterization of Ag2S and Ag2S/Ag2(S,Se) NIR nanocrystals. Nanoscale, 11(18), 9194-9200. https://doi.org/10.1039/C9NR02087J