Versatile PbS Quantum Dot Ligand Exchange Systems in the Presence of Pb-Thiolates

Aabhash Shrestha, Yanting Yin, Gunther Andersson, Nigel Spooner, Shizhang Qiao, Sheng Dai

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    An efficient ligand exchange strategy was demonstrated for PbS QDs by using Pb-thiolate as the exchanging ligand. Typically, the lead precursor was prepared by heating 178.6 mg of PbO and 0.634 mL oleic acid (OA) in 8 mL 1-octadecene (ODE) in a 100 mL Schlenk flask under argon protection at 150°C for 1 h to obtain a clear yellowish lead oleate solution. The temperature of the lead oleate solution was then reduced to 130°C and 84 μL of (TMS) 2 S in 4 mL ODE at room temperature was quickly injection into the hot lead precursor solution. The growth temperature was then maintained at 110°C for 10 min. The final QDs were precipitated with acetone, centrifuged, and diluted in 3 mL hexane for further use and characterization. The ligand exchange of PbS QDs was performed using a simple biphasic exchange procedure. It was seen that the Pb-thiolate ligands can better preserve the exciton absorption features as well as the emission intensities during the ligand exchange procedure. The Pb-thiol ligand exchange approach is versatile and applicable to a number of other ligand/solvent systems.

    Original languageEnglish
    Article number1602956
    Pages (from-to)Art: 1602956
    Number of pages6
    JournalSmall
    Volume13
    Issue number5
    DOIs
    Publication statusPublished - 2017

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