One pot synthesis of PbS/Cu2S core-shell nanoparticles and their optical properties
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.
| Main Authors: | , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedad Mexicana de Física
2014
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0035-001X2014000100003 |
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| Summary: | 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. |
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