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https://doi.org/10.1021/jp104311j
DC Field | Value | |
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dc.title | Synthesis of PbS/CdS core-shell QDs and their nonlinear optical properties | |
dc.contributor.author | Neo, M.S. | |
dc.contributor.author | Venkatram, N. | |
dc.contributor.author | Li, G.S. | |
dc.contributor.author | Chin, W.S. | |
dc.contributor.author | Ji, W. | |
dc.date.accessioned | 2014-06-23T05:51:55Z | |
dc.date.available | 2014-06-23T05:51:55Z | |
dc.date.issued | 2010-10-28 | |
dc.identifier.citation | Neo, M.S., Venkatram, N., Li, G.S., Chin, W.S., Ji, W. (2010-10-28). Synthesis of PbS/CdS core-shell QDs and their nonlinear optical properties. Journal of Physical Chemistry C 114 (42) : 18037-18044. ScholarBank@NUS Repository. https://doi.org/10.1021/jp104311j | |
dc.identifier.issn | 19327447 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/77186 | |
dc.description.abstract | We synthesized different sizes of PbS/CdS core-shell quantum dots (CSQDs) by using a cation-exchange method and studied the changes in their absorption and luminescence. Blue shifts in the absorption and photoluminescence (PL) peaks were observed with varying PL quantum yields. The PbS/CdS CSQDs dispersed in hexane or embedded in polystyrene films showed higher free-carrier absorption (FCA) as compared to pure PbS QDs. Saturable absorption (SA) was found to be significant in the smallest nanoparticles in both hexane and polymer films. A size-dependent FCA coefficient was observable, and smaller PbS/CdS nanoparticles were found to exhibit greater FCA. Free surface ligands were found to contribute to an enhancement in the nonlinear scattering above a critical irradiance threshold. We found that the FCA cross-section and the nonlinear refractive index are independent of the thickness of PbS/CdS-embedded polymer within experimental error. © 2010 American Chemical Society. | |
dc.description.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1021/jp104311j | |
dc.source | Scopus | |
dc.type | Article | |
dc.contributor.department | PHYSICS | |
dc.contributor.department | CHEMISTRY | |
dc.description.doi | 10.1021/jp104311j | |
dc.description.sourcetitle | Journal of Physical Chemistry C | |
dc.description.volume | 114 | |
dc.description.issue | 42 | |
dc.description.page | 18037-18044 | |
dc.identifier.isiut | 000283110700003 | |
Appears in Collections: | Staff Publications |
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