| dc.contributor.author | Kiprotich, Sharon | |
| dc.contributor.author | Onani, Martin O | |
| dc.date.accessioned | 2025-12-04T10:50:05Z | |
| dc.date.available | 2025-12-04T10:50:05Z | |
| dc.date.issued | 2022 | |
| dc.identifier.uri | https://doi.org/10.1088/2053-1591/ac5073 | |
| dc.identifier.uri | http://repository.mut.ac.ke:8080/xmlui/handle/123456789/6887 | |
| dc.description.abstract | This study presents a facile synthetic approach used to prepare CdTe/CdSe core/shell nanoparticles
(NPs). The effects of reaction time on the material properties of the CdTe/CdSe NPs are reported. It
was realized that the reaction time has significant impact on the CdSe shell growth on the CdTe core.
Various techniques were used to characterize the as-prepared CdTe/CdSe NPs. The x-ray diffraction
(XRD) was used to study the crystal structure and the possible growth of the CdSe shell on the CdTe
core. The results obtained indicated the formation of zinc blende crystal structure which was
transformed from a polycrystalline to single crystalline structure. TheXRDpattern displayed features
that are intermediate between the CdTe and CdSe, a sign of shell formation and not two separate
compounds formed. This was also supported by high resolution transmission electron microscope
images obtained. The crystallite sizes estimated using Scherrer formula were all less than 3 nmshowing
that the NPs are in quantum confinement regime. Scanning electron microscope was used to
determine the surface topography while the energy x-ray dispersive spectrometer displayed the
elemental composition of the as-prepared NPs. SEM andHRTEMimages showed uniformly
distributed spherical NPs with some agglomerations observed at longer duration of synthesis. The
optical properties (photoluminescence (PL) and absorbance) investigated at different reaction times
(20, 40, 60 and 80 min) presented novel features which show the formation of a thin CdSe shell on the
CdTe core NPs. The PL emission wavelength was dramatically red shifted upon the growth of the
CdSe shell on the CdTe core (from 541–615nm). Other unique features of the as-grown CdTe/CdSe
NPs are discussed in detail. The obtained results displayed good material properties of the CdTe/CdSe
NPs suitable for use in biomaging applications. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Materials Science Express | en_US |
| dc.title | Effects of growth time on the material properties of CdTe/CdSe core/ shell nanoparticles prepared by a facile wet chemical route | en_US |
| dc.type | Article | en_US |
