Air-stable PbS quantum dots synthesized with slow reaction kinetics via a PbBr2 precursor

Lin Yuan, Robert Patterson, Wenkai Cao, Zewen Zhang, Zhilong Zhang, John A. Stride, Peter Reece, Gavin Conibeer, Shujuan Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
27 Downloads (Pure)

Abstract

PbS quantum dots have been synthesized using a PbBr2 precursor and the halide content has been examined. Slower reaction kinetics for quantum dots growth relative to the use of PbCl2 was observed for PbBr2, giving a possible route to increased control over quantum dot size with in situ passivation. Unambiguous determination of the surface conditions of nanomaterials is still a developing area of science, pushing the limits of current microscopy and analytical techniques. Contributions to a rigorous form of nanomaterial surface analysis are made here using X-ray photoelectron spectroscopy to analyse bonding in detail. Atomic resolution TEM is applied to produce energy dispersive X-ray spectroscopy maps with state of the art resolution. This analysis has been applied to air-stable halide terminated PbS nanoparticles, which is a nanomaterial of central importance for quantum confined solar cell applications. Chemical analysis from X-ray photoelectron spectroscopy is consistent with Br surface termination and high resolution energy dispersive X-ray spectroscopy (EDS) maps also show a positive spatial correlation for Br with quantum dot location. An observed excess Br content is attributed to the presence of bromine terminated PbS quantum dots nuclei in the final colloid.

Original languageEnglish
Pages (from-to)68579-68586
Number of pages8
JournalRSC Advances
Volume5
Issue number84
DOIs
Publication statusPublished - 2015
Externally publishedYes

Bibliographical note

Copyright the Publisher 2015. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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