Synthesis of CdTe quantum dots capped with castor oil using a hot injection solution method

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dc.contributor.authorRevaprasadu, Neerish
dc.contributor.authorKyobe, Josh
dc.contributor.authorKhan, Malik Dilshad
dc.contributor.authorKinunda, G.
dc.contributor.authorMubofu, Egid
dc.coverageUnited States of America
dc.coverage.conferenceissn
dc.date.accessioned2025-11-26T07:08:24Z
dc.date.available2025-11-26T07:08:24Z
dc.date.issued2020
dc.departmentNameChemistry
dc.description.abstractCastor oil (CSTO), an extract from castor bean was used as capping material for CdTe quantum dots (QDs), synthesized from cadmium chloride and tellurium powder using a modified hot injection method. The formation of CdTe QDs in the colloidal solution was monitored by UV–Vis spectrophotometry. The average particle sizes were deduced from the absorption data, transmission electron microscopy (TEM) images and powdered-X-ray diffraction (p-XRD). The average particle size of CdTe QDs deduced from the UV–Vis absorption measurements range from 4.94 nm to 10.04 nm for CdTe QDs synthesized at 230 °C, 250 °C and 280 °C. TEM images of the CdTe QDs synthesized at 250 °C and 280 °C, for 2 h showed close to spherical geometry with average diameter of 7.38 ± 0.43 nm and 9.88 ± 0.67 nm, respectively. The p-XRD patterns confirmed the presence of CdTe crystallites with a cubic phase. The average diameter of CdTe QDs as deduced from the p-XRD patterns was 7.54 ± 0.03 nm and 9.69 ± 0.13 nm, respectively, which is in good agreement with the results from TEM and UV–Vis absorption measurements. The photoluminescence spectroscopy showed the formation of nearly monodispersed particles with emission maxima at 673 nm, 714 nm and 743 nm for CdTe QDs prepared at 230 °C for 30 min, 60 min and 120 min, respectively. These results show that green biomasses are valuable eco-friendly materials which can be used to stabilize nanomaterials.
dc.facultyFaculty of Science, Agriculture and Engineering
dc.format.preprintNo
dc.identifier.citationKyobe, J.W., Khan, M.D., Kinunda, G., Mubofu, E.B. and Revaprasadu, N., 2020. Synthesis of CdTe quantum dots capped with castor oil using a hot injection solution method. Materials Science in Semiconductor Processing, 106, pp.1-7.
dc.identifier.issn1873-4081 (online)
dc.identifier.issn1369-8001 (print)
dc.identifier.otherhttps://doi.org/10.1016/j.mssp.2019.104780
dc.identifier.urihttp://hdl.handle.net/10530/58414
dc.inproceedingsissn
dc.issuenumber106
dc.keynoteissn
dc.pages1 - 7
dc.peerreviewedYes
dc.publisherElsevier
dc.subjectBand gap
dc.subjectCastor oil
dc.subjectCadmium telluride
dc.subjectQuantum dots
dc.subjectThermolysis
dc.titleSynthesis of CdTe quantum dots capped with castor oil using a hot injection solution method
dc.title.journalMaterials Science in Semiconductor Processing
dc.typeJournal Article
dspace.entity.typePublication
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