Optical characterization of the AgInS2 nanocrystals synthesized in aqueous media under stoichiometric conditions

Brightly luminescent colloidal Ag–In–S nanoparticles stabilized in aqueous solutions by branched polyethyleneimine

“…We can, therefore, assume that the lighter spots on the SEM photographs reflect the presence of multiple smaller Ag-In-S NPs embedded into the PEI globules (lower-contrast areas) of ~100 nm in size. Earlier we have studied Ag-In-S NPs stabilized by mercaptoacetate ions in aqueous solutions both at Ag:In ratio lower than 1:1 [33] and the stoichiometric AgInS 2 NPs [34], where no sample charging problems occured. It has been found in [33,34] by DLS, HRTEM, SAED and XRD that the Ag-In-S NPs were 4−5 nm in size and crystallized in the tetragonal modification.…”

“…Earlier we have studied Ag-In-S NPs stabilized by mercaptoacetate ions in aqueous solutions both at Ag:In ratio lower than 1:1 [33] and the stoichiometric AgInS 2 NPs [34], where no sample charging problems occured. It has been found in [33,34] by DLS, HRTEM, SAED and XRD that the Ag-In-S NPs were 4−5 nm in size and crystallized in the tetragonal modification. We expect that the size of Ag-In-S NPs incorporated into the PEI globules is comparable with the values reported in [33,34].…”

“…It has been found in [33,34] by DLS, HRTEM, SAED and XRD that the Ag-In-S NPs were 4−5 nm in size and crystallized in the tetragonal modification. We expect that the size of Ag-In-S NPs incorporated into the PEI globules is comparable with the values reported in [33,34].…”

“…Recently we have shown feasibility of the direct synthesis of luminescent Ag-In-S NPs stabilized by mercaptoacetate anions in aqueous solutions [33,34]. The PL QY of the mercaptoacetate-stabilized Ag-In-S achieved 12% in optimized synthesis condition and can be further increased to around 30% by the deposition of a ZnS shell on the NP surface.…”

Electronic properties and third-order optical nonlinearities in tetragonal chalcopyrite AgInS2, AgInS2/ZnS and cubic spinel AgIn5S8, AgIn5S8/ZnS quantum dots

“…122)) anionic sub-lattice vibrational modes. 20 It is worth noting that changes in this band after the Zn 2+ alloying may be well indicative of the structural changes at the surface of the QDs. However a decrease in the intensity of the 280-290 cm À1 band observed for the t-AIS/ZnS sample shall be rather be associated with the higher content of the organic phase in the sample.…”