Please use this identifier to cite or link to this item:
https://doi.org/10.1021/jp104311j
Title: | Synthesis of PbS/CdS core-shell QDs and their nonlinear optical properties | Authors: | Neo, M.S. Venkatram, N. Li, G.S. Chin, W.S. Ji, W. |
Issue Date: | 28-Oct-2010 | 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 | 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. | Source Title: | Journal of Physical Chemistry C | URI: | http://scholarbank.nus.edu.sg/handle/10635/77186 | ISSN: | 19327447 | DOI: | 10.1021/jp104311j |
Appears in Collections: | Staff Publications |
Show full item record
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.