Characterization and third-order optical nonlinearities of uniform surface-modified CdS nanoparticles

Han, Ming‐Yong; Gan, Lin; Huang, Wei; Chew, C. H.; Zou, B. S.; Xu, Guo Qin; Ji, Wei; Zhang, X.J; Ng, S. C.

doi:10.1016/s0039-9140(97)00289-0

Cited by 14 publications

(2 citation statements)

References 8 publications

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“…Although various materials have been shown to possess 3NLO properties (section SI1 in the Supporting Information), the search for materials with exceptional 3NLO properties must be continued. Among possible candidates, semiconductor quantum dots (QDs) dispersed in dielectric matrices have received the most attention. − However, their 3NLO activities have not been high enough for practical use, so intense research in this field is still necessary.…”

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confidence: 99%

Increase of Third-Order Nonlinear Optical Activity of PbS Quantum Dots in Zeolite Y by Increasing Cation Size

Kim

Yoon

2012

J. Am. Chem. Soc.

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The third-order nonlinear optical (3NLO) activity of PbS quantum dots (QDs) encapsulated in zeolite Y has been expected to depend sensitively on the countercation of the zeolite host. However, ion exchange of the pristine countercation, H(+), with other cations has not been possible because the framework decomposes and the QDs aggregate immediately when the PbS QD-incorporating zeolite Y with H(+) as the countercation is exposed to the atmosphere. We now report that when H(+) is transformed to NH(4)(+), the framework of PbS QD-containing zeolite Y does not undergo decomposition and the PbS QDs do not undergo aggregation to form larger QDs during the aqueous ion exchange of NH(4)(+) with alkali-metal ions (M(A)(+) = Li, Na(+), K(+), Rb(+)). The 3NLO activity of the M(A)(+)-exchanged PbS QD-incorporating zeolite Y film increases with increasing size of M(A)(+). The stabilization of the surface-bound exciton by the electron-rich framework oxide and electron-poor cation is proposed to be responsible for the increase. This is the first example of a method for systematically increasing the 3NLO activity of QDs dispersed in a dielectric matrix by systematically changing its properties. These results will serve as a guideline for future research and also promote applications of QD-incorporating zeolites in various fields.

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confidence: 99%

Increase of Third-Order Nonlinear Optical Activity of PbS Quantum Dots in Zeolite Y by Increasing Cation Size

Kim

Yoon

2012

J. Am. Chem. Soc.

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“…Nano-objects exhibit the behaviours of both NLO absorptions and NLO refractions [11,12]. Typical results from the Z -scan experiments on the ZnS nano-objects are demonstrated in figures 4 and 5.…”

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confidence: 97%

Investigation of the room-temperature solid-state reactions leading to ZnS nanotubes and the third-order nonlinear optical properties of the nanotubes obtained

Zhou

Hong

et al. 2005

Nanotechnology

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The room-temperature solid-state reactions occurring in the preparation of nanotubes of zinc sulfide are further investigated by x-ray powder diffractometry (XRD) and infra-red (IR) spectrometry measurements, and the nanotube ZnS product obtained is measured by Z-scan technology to investigate the third-order nonlinear optical (NLO) properties. The XRD result suggests that the reactions leading to the formation of the nanotubules have occurred through reaction-controlled to growth-controlled procedures, and the IR result indicates that the procedures involve a coordination effect of the additive DABCO as ligand on the reactant. The result of NLO measurements shows that the nanotube ZnS products obtained have the behaviours of the third-order nonlinear optical properties of both NLO absorption and NLO refraction with self-focusing effects.

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Semiconductor Nanoparticles

2003

Handbook of Nanophase and Nanostructured Materials

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Characterization and third-order optical nonlinearities of uniform surface-modified CdS nanoparticles

Cited by 14 publications

References 8 publications

Increase of Third-Order Nonlinear Optical Activity of PbS Quantum Dots in Zeolite Y by Increasing Cation Size

Increase of Third-Order Nonlinear Optical Activity of PbS Quantum Dots in Zeolite Y by Increasing Cation Size

Investigation of the room-temperature solid-state reactions leading to ZnS nanotubes and the third-order nonlinear optical properties of the nanotubes obtained

Semiconductor Nanoparticles

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