Room temperature synthesis of CuInS₂ nanocrystals

Abstract

Herein, we investigate a synthetic approach to prepare copper indium sulfide nanocrystals at room temperature.

Nickel sulfide thin films and nanocrystals synthesized from nickel xanthate precursors

“…9b. The NPs produced by the solvothermal route exhibit quite similar thermogravimetric curves, comparable with curves previously obtained from oleylamine-capped NPs [58], with a gradual mass loss (total mass loss: 29% for C6, 200°C and 27% for C7, 200°C) over a wide temperature range (180-480°C).…”

“…For the room-temperature synthesis, NiXa-C6 was dissolved in toluene and the reaction was started by the addition of oleylamine, according to a recently published procedure for the preparation of CuInS 2 and CdS nanocrystals [58]. Within a few hours after the addition of the amine, the color of the solution changes from green, via brown to black, indicating the decomposition of the greenish nickel xanthates and the formation of nickel sulfide nanoparticles.…”

“…In an analogous manner to our recently published procedure [58], nanoparticles were also prepared at room temperature under nitrogen atmosphere in a glovebox (LABmaster DP, MBraun) by dissolving NiXa-C6 in toluene with a concentration of 0.063 mmol/mL. Decomposition of NiXa-C6 was induced by adding oleylamine (OLA) in a NiXa-C6:OLA molar ratio of 1:4 under vigorous stirring, whereby the green solution turned brown.…”

“…Far less explored is the conversion of metal xanthates to metal sulfides at room temperature by photochemically induced decomposition using UV irradiation [56,57] or direct chemical reaction with primary amines. In this latter study, we have recently demonstrated that the conversion of copper and indium xanthates into CuInS 2 nanocrystals at room temperature in the presence of oleylamine proceeds via a reaction mechanism different to the Chugaev elimination [58].…”

“…The attractive properties of metal xanthates, like their usually good stability (also in solution), relatively low decomposition temperature (below 200°C) and simplicity to tailor solubility and decomposition behavior by variation of their organic side chains, have ensured that they are widely employed in the preparation of various metal sulfide nanomaterials [35][36][37][38][39][51][52][53][54][55][56][57][58][59][60].…”