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Synthesis of w-CdS quantum dots and discovery of intense sub band emission owing to longitudinal optical phonons

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Abstract

Cadmium sulfide (CdS) quantum dots (QDs), capped with cetyltrimethylammonium bromide (CTAB), and was synthesized as stable, aqueous, colloidal nanofluid. A series of nine intense, well-resolved emission lines between 400 and 750 nm were observed for the first time when exciting the CdS QDs nanofluid with a 355-nm high energy pulsed Nd:YAG laser radiation. The energy separation between any two successive emission lines equals to the characteristic overtone energy of 295 cm−1 of the longitudinal optical phonon of CdS QDs. In addition, recording the PL spectrum by using a xenon broad band light source resulted in the observation of this characteristic overtone energy of 295 cm−1. In agreement with this photoluminescence characteristic, Raman spectrum exhibited four prominent Stokes lines with Raman shift equal to and multiple of 295 cm−1. Transmission electron microscopy investigation showed that the CdS QDs were spherical with hexagonal wurtzite structure and had a size in the range of 5–10 nm.

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Acknowledgments

The support by Physics Department, KFUPM under Laser Research Group and also KACST is highly acknowledged.

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Authors and Affiliations

  1. Laser Research Group, Physics Department, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia

    Mohammed A. Gondal & Mohamed A. Dastageer

  2. Center of Excellence in Nanotechnology (CENT), King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia

    Mohammed A. Gondal & Mohamed A. Dastageer

  3. Petroleum &Petrochemicals Research Institute (PAPRI), King Abdulaziz City for Science and Technology (KACST), P. O. Box 6086, Riyadh, 11442, Saudi Arabia

    Abdulaziz A. Bagabas

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  1. Mohammed A. Gondal
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  2. Abdulaziz A. Bagabas
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  3. Mohamed A. Dastageer
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Correspondence to Mohammed A. Gondal.

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Gondal, M.A., Bagabas, A.A. & Dastageer, M.A. Synthesis of w-CdS quantum dots and discovery of intense sub band emission owing to longitudinal optical phonons. J Nanopart Res 13, 3835–3842 (2011). https://doi.org/10.1007/s11051-011-0318-y

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  • DOI: https://doi.org/10.1007/s11051-011-0318-y

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