From Indium-Doped Ag2S to AgInS2 Nanocrystals: Low-Temperature In Situ Conversion of Colloidal Ag2S Nanoparticles and Their NIR Fluorescence

Graphical Tunable nanocrystals . Ternary I-III-VI 2 (AgInS 2 ) colloidal nanocrystals (NCs) with precise control of the composition (from In 3+ doping to ternary composition) and good NIR fluorescence performance (800–1000 nm) have been synthesized by facile low-temperature in situ conversion of colloidal Ag 2 S nanoparticles. In 3+ ions were inserted into the crystal lattice of Ag 2 S NCs at a relatively low temperature as dopant with ternary AgInS 2 NCs obtained at a higher temperature following a phase transition (see figure). Focusing on ternary I-III-VI 2 colloidal nanocrystals (NCs) synthesized with precise control of the composition (from doping to ternary composition) and NIR fluorescence performance, monodisperse binary In 3+ -doped Ag 2 S NCs and ternary AgInS 2 NCs have been achieved successfully by facile low-temperature in situ conversion of colloidal Ag 2 S nanoparticles. In 3+ ions were inserted into the crystal lattice of Ag 2 S NCs at a relatively low temperature as dopant and ternary AgInS 2 NCs were obtained at a higher temperature following a phase transition. These doped Ag 2 S and AgInS 2 NCs based on different indium precursor concentrations were explored with respect to the position and intensity of the near-infrared photoluminescent emission at different doping levels and crystal phase evolution.