No abstract

The bifunctionality of a coordinating solvent (oleylamine) plays an important role in the dissolution step of selenium during the nanoparticle synthesis.

We demonstrate a highly reactive modified Se/S precursor for the facile synthesis of alloyed ZnSeS:Mn nanoparticles in a one-pot approach.

A Facile Synthesis of Alloyed Mn-Doped ZnSeS Nanoparticles Using a ModifiedSelenium/Sulfur Precursor in a One-Pot Approach. -Highly luminescent Mn doped ZnSeS nanoparticles are prepared by adding a modified Se/S-precursor solution consisting of Se powder, NaBH 4, and different amounts of 1-dodecanethiol in oleylamine to a solution of manganese stearate in 1-octadecene at 240 C. The solution then is cooled to 220 C and a zinc stearate solution in MeOH is added and again heated to 240 C (20 min) prior to precipitating the nanoparticles with MeOH. The main challenge of the phosphine-free synthesis of metal selenide nanoparticles is the solubility and reduction of elemental Se in organic solvents without the use of alkylphosphine. The modified Se/S-precursor optimizes the preparation of highly luminescent alloyed nanostructures in view of required time and purification steps. The prepared monodisperse nanoparticles possess an average particle size of 6.8 nm and high quality optical properties with up to 42% photoluminescence quantum yield, the latter being significantly affected by the ratio of S to Se in the precursor solution. -(ZIMDARS*, J.; PILGER, J.; ENTRUP, M.; DEITING, D.; SCHAEFER, A. H.; BREDOL, M.; New J. Chem. 40 (2016) 10, 8465-8470 ; Dep. Chem. Eng., Muenster Univ. Appl. Sci., D-48565 Steinfurt, Germany; Eng.) -J. Schramke 50-007