Synthesis of L-cysteine-CdSe Quantum Dots for optical Biosensing Application
Cadmium selenide (CdSe) nanocrystals, modified with water-soluble L-cysteine and known as CdSe/Cys nanocrystals, were synthesized using L-cysteine as a stabilizing agent. This synthesis process ensured the formation of highly stable nanocrystals with desirable properties for various applications. T...
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| Language: | English |
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University of Baghdad
2025-06-01
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| Series: | Iraqi Journal of Physics |
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| Online Access: | https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/1336 |
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| author | Thalfaa Rasheed Ajeel Manal Midhat Abdullah Fadhel Mohammed Lafta |
| author_facet | Thalfaa Rasheed Ajeel Manal Midhat Abdullah Fadhel Mohammed Lafta |
| author_sort | Thalfaa Rasheed Ajeel |
| collection | DOAJ |
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Cadmium selenide (CdSe) nanocrystals, modified with water-soluble L-cysteine and known as CdSe/Cys nanocrystals, were synthesized using L-cysteine as a stabilizing agent. This synthesis process ensured the formation of highly stable nanocrystals with desirable properties for various applications. The CdSe/Cys nanocrystals were carefully studied using advanced methods to understand their structure, composition, and optical features in detail. The peak that shows the preferred (111) orientation of L-cysteine-capped CdSe matches the usual core components, as indicated by the XRD pattern. On the other hand, the peaks at (220) and (311) are not as prominent. Photoluminescence (PL) spectroscopy was conducted to study the optical properties of the CdSe/Cys nanocrystals. The PL spectra's strong fluorescence emission showed these nanocrystals' excellent quantum efficiency. The emission peak was sharp and well-defined, highlighting the uniformity in size and composition of the synthesised nanocrystals. The study revealed the robust fluorescence of the spherical CdSe/Cys nanoparticles, with an average diameter of 2.3 nm. Modifying the surface of CdSe nanoparticles with cysteine improved their water solubility and biocompatibility.
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| format | Article |
| id | doaj-art-eae1682e2fec49dbbe4bf8aabea373dc |
| institution | OA Journals |
| issn | 2070-4003 2664-5548 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | University of Baghdad |
| record_format | Article |
| series | Iraqi Journal of Physics |
| spelling | doaj-art-eae1682e2fec49dbbe4bf8aabea373dc2025-08-20T02:06:22ZengUniversity of BaghdadIraqi Journal of Physics2070-40032664-55482025-06-0123210.30723/ijp.v23i2.1336Synthesis of L-cysteine-CdSe Quantum Dots for optical Biosensing ApplicationThalfaa Rasheed Ajeel0https://orcid.org/0009-0003-3730-6724Manal Midhat Abdullah1Fadhel Mohammed Lafta2Department of Physics, College of Science, University of Baghdad, Baghdad, IraqDepartment of Physics, College of Science, University of Baghdad, Baghdad, IraqDepartment of Biology, College of Science, University of Baghdad, Baghdad, Iraq Cadmium selenide (CdSe) nanocrystals, modified with water-soluble L-cysteine and known as CdSe/Cys nanocrystals, were synthesized using L-cysteine as a stabilizing agent. This synthesis process ensured the formation of highly stable nanocrystals with desirable properties for various applications. The CdSe/Cys nanocrystals were carefully studied using advanced methods to understand their structure, composition, and optical features in detail. The peak that shows the preferred (111) orientation of L-cysteine-capped CdSe matches the usual core components, as indicated by the XRD pattern. On the other hand, the peaks at (220) and (311) are not as prominent. Photoluminescence (PL) spectroscopy was conducted to study the optical properties of the CdSe/Cys nanocrystals. The PL spectra's strong fluorescence emission showed these nanocrystals' excellent quantum efficiency. The emission peak was sharp and well-defined, highlighting the uniformity in size and composition of the synthesised nanocrystals. The study revealed the robust fluorescence of the spherical CdSe/Cys nanoparticles, with an average diameter of 2.3 nm. Modifying the surface of CdSe nanoparticles with cysteine improved their water solubility and biocompatibility. https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/1336CdSe Quantum DotsL-cysteineBiosensorsNanomaterialsOptical Properties |
| spellingShingle | Thalfaa Rasheed Ajeel Manal Midhat Abdullah Fadhel Mohammed Lafta Synthesis of L-cysteine-CdSe Quantum Dots for optical Biosensing Application Iraqi Journal of Physics CdSe Quantum Dots L-cysteine Biosensors Nanomaterials Optical Properties |
| title | Synthesis of L-cysteine-CdSe Quantum Dots for optical Biosensing Application |
| title_full | Synthesis of L-cysteine-CdSe Quantum Dots for optical Biosensing Application |
| title_fullStr | Synthesis of L-cysteine-CdSe Quantum Dots for optical Biosensing Application |
| title_full_unstemmed | Synthesis of L-cysteine-CdSe Quantum Dots for optical Biosensing Application |
| title_short | Synthesis of L-cysteine-CdSe Quantum Dots for optical Biosensing Application |
| title_sort | synthesis of l cysteine cdse quantum dots for optical biosensing application |
| topic | CdSe Quantum Dots L-cysteine Biosensors Nanomaterials Optical Properties |
| url | https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/1336 |
| work_keys_str_mv | AT thalfaarasheedajeel synthesisoflcysteinecdsequantumdotsforopticalbiosensingapplication AT manalmidhatabdullah synthesisoflcysteinecdsequantumdotsforopticalbiosensingapplication AT fadhelmohammedlafta synthesisoflcysteinecdsequantumdotsforopticalbiosensingapplication |