Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method
Cr3+ ions doped ZnS nanocrystals were synthesized using the co-precipitation method. The as-prepared sample was characterized to investigate the magnetic and thermal properties along with its structural and spectral studies. X-ray diffraction (XRD) analysis confirms the cubic zinc blend structure, a...
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| Format: | Article |
| Language: | English |
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Elsevier
2019-06-01
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| Series: | Journal of Science: Advanced Materials and Devices |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468217918302144 |
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| author | Sk. Johny Basha V. Khidhirbrahmendra J. Madhavi U.S. Udayachandran Thampy Ch. Venkata Reddy R.V.S.S.N. Ravikumar |
| author_facet | Sk. Johny Basha V. Khidhirbrahmendra J. Madhavi U.S. Udayachandran Thampy Ch. Venkata Reddy R.V.S.S.N. Ravikumar |
| author_sort | Sk. Johny Basha |
| collection | DOAJ |
| description | Cr3+ ions doped ZnS nanocrystals were synthesized using the co-precipitation method. The as-prepared sample was characterized to investigate the magnetic and thermal properties along with its structural and spectral studies. X-ray diffraction (XRD) analysis confirms the cubic zinc blend structure, and the mean crystallite size is evaluated to be 4.7 nm. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) images indicate stone-like structures. The deposition of Cr3+ ions in ZnS nanocrystals is evidenced by energy dispersive spectroscopy (EDS) analysis. From the optical absorption data, the bands in the UV-VIS region are recognized as the characteristic bands of Cr3+ ions. Crystal field and Racah parameters are calculated as Dq = 1564, B = 567 and C = 3389 cm−1. The electron paramagnetic resonance (EPR) spectrum exhibits well resolved paramagnetic resonance signal at g = 1.982 which arises from the exchange interaction between Cr3+ ions. It reveals from the correlating optical and EPR results that the Cr3+ ions occupy distorted octahedral site symmetry in the host lattice. Photoluminescence spectrum shows three distinct emission bands in blue, green and orange regions. Commission International de I'Eclairage (CIE) chromaticity coordinates are found in the blue region at (x, y) = (0.172, 0.121). In addition, the prepared nanocrystals exhibit a ferromagnetic behavior with a coercive field (Hc) of 513 Oe. The thermal steadiness of the prepared samples was characterized by Thermal gravimetric – Differential thermal analysis (TG-DTA). These Cr3+ ions doped ZnS nanocrystals find potential applications in LEDs, spintronics and nanoscale quantum devices. Keywords: Nanocrystals, Co-precipitation, Chromium ions, Powder XRD, Spectroscopic studies, Photoluminescence |
| first_indexed | 2024-12-14T13:46:44Z |
| format | Article |
| id | doaj.art-ff5ea10b0dfc4c94b7a54ac1c6a50ce0 |
| institution | Directory Open Access Journal |
| issn | 2468-2179 |
| language | English |
| last_indexed | 2024-12-14T13:46:44Z |
| publishDate | 2019-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Science: Advanced Materials and Devices |
| spelling | doaj.art-ff5ea10b0dfc4c94b7a54ac1c6a50ce02022-12-21T22:59:17ZengElsevierJournal of Science: Advanced Materials and Devices2468-21792019-06-0142260266Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation methodSk. Johny Basha0V. Khidhirbrahmendra1J. Madhavi2U.S. Udayachandran Thampy3Ch. Venkata Reddy4R.V.S.S.N. Ravikumar5Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur, 522 510, A.P, IndiaDepartment of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur, 522 510, A.P, IndiaDepartment of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur, 522 510, A.P, IndiaDepartment of Physics, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala, 695581, IndiaSchool of Mechanical Engineering, Yeungnam University, Gyeongsan, 712-749, Republic of KoreaDepartment of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur, 522 510, A.P, India; Corresponding author. Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, 522510, A.P, India. Fax: +91 863 2293378.Cr3+ ions doped ZnS nanocrystals were synthesized using the co-precipitation method. The as-prepared sample was characterized to investigate the magnetic and thermal properties along with its structural and spectral studies. X-ray diffraction (XRD) analysis confirms the cubic zinc blend structure, and the mean crystallite size is evaluated to be 4.7 nm. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) images indicate stone-like structures. The deposition of Cr3+ ions in ZnS nanocrystals is evidenced by energy dispersive spectroscopy (EDS) analysis. From the optical absorption data, the bands in the UV-VIS region are recognized as the characteristic bands of Cr3+ ions. Crystal field and Racah parameters are calculated as Dq = 1564, B = 567 and C = 3389 cm−1. The electron paramagnetic resonance (EPR) spectrum exhibits well resolved paramagnetic resonance signal at g = 1.982 which arises from the exchange interaction between Cr3+ ions. It reveals from the correlating optical and EPR results that the Cr3+ ions occupy distorted octahedral site symmetry in the host lattice. Photoluminescence spectrum shows three distinct emission bands in blue, green and orange regions. Commission International de I'Eclairage (CIE) chromaticity coordinates are found in the blue region at (x, y) = (0.172, 0.121). In addition, the prepared nanocrystals exhibit a ferromagnetic behavior with a coercive field (Hc) of 513 Oe. The thermal steadiness of the prepared samples was characterized by Thermal gravimetric – Differential thermal analysis (TG-DTA). These Cr3+ ions doped ZnS nanocrystals find potential applications in LEDs, spintronics and nanoscale quantum devices. Keywords: Nanocrystals, Co-precipitation, Chromium ions, Powder XRD, Spectroscopic studies, Photoluminescencehttp://www.sciencedirect.com/science/article/pii/S2468217918302144 |
| spellingShingle | Sk. Johny Basha V. Khidhirbrahmendra J. Madhavi U.S. Udayachandran Thampy Ch. Venkata Reddy R.V.S.S.N. Ravikumar Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method Journal of Science: Advanced Materials and Devices |
| title | Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method |
| title_full | Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method |
| title_fullStr | Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method |
| title_full_unstemmed | Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method |
| title_short | Structural, optical, magnetic and thermal investigations on Cr3+ ions doped ZnS nanocrystals by co-precipitation method |
| title_sort | structural optical magnetic and thermal investigations on cr3 ions doped zns nanocrystals by co precipitation method |
| url | http://www.sciencedirect.com/science/article/pii/S2468217918302144 |
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