Abstract

SERRANO, T.  and  GOMEZ, I.. One pot synthesis of PbS/Cu₂S core-shell nanoparticles and their optical properties. Rev. mex. fis. [online]. 2014, vol.60, n.1, pp.14-21. ISSN 0035-001X.

The synthesis of PbS/Cu₂S core-shell nanoparticles with emission on the visible range and with improved luminescence properties was carried out by the colloidal solution-phase growth method by using simple stabilizers such as trisodium citrate and 3-mercaptopropionic acid. The core shell arrangement for particles with different crystalline structure was achieved, in addition this is the first report related to the synthesis PbS/Cu₂S core-shell system. The data obtained from absorption spectra, PL spectra, and HRTEM image provided direct proof of the formation of PbS core with size around 11 nm and Cu₂S shell of 5 nm thickness. According to the UV-vis absorption and PL spectrum, the optical characteristics observed in the synthesized material correspond to a PbS/Cu₂S system that has a higher confinement effect than the pure PbS nanoparticles. The QY was improved in 15 % from PbS to PbS/Cu₂S nanoparticles. The estimated band (HOMO-LUMO) alignment determined by CV measurements corresponds to a type-I core shell arrangement.

Keywords : Semiconductors; core-shell; PbS; Cu₂S; synthesis.

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