Cadmium Sulfide Quantum Dots Stabilized By Castor Oil and Ricinoleic Acid

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dc.contributor.authorKyobe, Joseph W.
dc.contributor.authorMubofu, Egid B.
dc.contributor.authorMakame, Yahya M. M.
dc.contributor.authorMlowe, Sixberth
dc.contributor.authorRevaprasadu, Neerish
dc.date.accessioned2016-06-15T20:54:36Z
dc.date.available2016-06-15T20:54:36Z
dc.date.issued2016
dc.descriptionFull text can be accessed at http://www.sciencedirect.com/science/article/pii/S138694771530237Xen_US
dc.description.abstractCastor oil and ricinoleic acid (an isolate of castor oil) are environmentally friendly bio-based organic surfactants that have been used as capping agents to prepare nearly spherical cadmium sulfide quantum dots (QDs) at 230, 250 and 280 °C. The prepared quantum dots were characterized by Ultra violet–visible (UV–vis), Photoluminescence (PL), Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM) and X-ray diffraction (XRD) giving an overall CdS QDs average size of 5.14±0.39 nm. The broad XRD pattern and crystal lattice fringes in the HRTEM images showed a hexagonal phase composition of the CdS QDs. The calculated/estimated average size of the prepared castor oil capped CdS QDs for various techniques were 4.64 nm (TEM), 4.65 nm (EMA), 5.35 nm (UV–vis) and 6.46 nm (XRD). For ricinoleic acid capped CdS QDs, the average sizes were 5.56 nm (TEM), 4.78 nm (EMA), 5.52 nm (UV–vis) and 8.21 nm (XRD). Optical properties of CdS QDs showed a change of band gap energy from its bulk band gap of 2.42–2.82 eV due to quantum size confinement effect for temperature range of 230–280 °C. Similarly, a blue shift was observed in the photoluminescence spectra. Scanning electron microscope (SEM) observations show that the as-synthesized CdS QDs structures are spherical in shape. Fourier transform infra-red (FTIR) studies confirms the formation of castor oil and ricinoleic acid capped CdS QDs.en_US
dc.identifier.citationKyobe, J.W., Mubofu, E.B., Makame, Y.M., Mlowe, S. and Revaprasadu, N., 2016. Cadmium sulfide quantum dots stabilized by castor oil and ricinoleic acid. Physica E: Low-dimensional Systems and Nanostructures, 76, pp.95-102.en_US
dc.identifier.doi10.1016/j.physe.2015.10.008
dc.identifier.urihttp://hdl.handle.net/20.500.11810/2491
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.titleCadmium Sulfide Quantum Dots Stabilized By Castor Oil and Ricinoleic Aciden_US
dc.typeJournal Articleen_US
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