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. 2015 Jun 20;7(4):325–331. doi: 10.1007/s40820-015-0046-4

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© The Author(s) 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — a UV absorption spectra of PbS CQDs with different hybrid ligands. TEM images of PbS CQDs with different hybrid ligands: b without hybrid ligads (ligand A); c CdCl₂ + OLA + OPA (ligand B); d CdCl₂ + OLA + TDPA (ligand C); e CdCl₂ + OLA +ODPA (ligand D). f XRD patterns of PbS CQDs thin films with different complex ligands