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Batool A, Aisida SO, Javed R, Mushtaq M, Ugwuoke CO, Ali JS, Albalawi H, Ahmad I, Zhao TK, Ezema FI. PEG Capped $${Ni}_{x}{Co}_{1-x}{Fe}_{2 }{O}_{4}$$ Nanocomposites: Microstructural, Morphological, Optical, Magnetic, Antimicrobial, and Photodegradable Properties. BioNanoSci 2023. [DOI: 10.1007/s12668-023-01064-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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2
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Alshoaibi A, Ike PO, Nwanya AC, Awada C, Islam S, Ezema FI. Effect of Mg on the Structural, Optical and Thermoluminescence Properties of Li 3Al 3(BO 3) 4: Shift in Main Glow Peak. Molecules 2023; 28:molecules28020504. [PMID: 36677563 PMCID: PMC9862032 DOI: 10.3390/molecules28020504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 12/22/2022] [Accepted: 12/30/2022] [Indexed: 01/07/2023]
Abstract
The doping of magnesium on lithium aluminium borate phosphor is reported in this study. A solid-state sintering technique was employed as the borate samples were synthesized. This report focuses on the structural, optical, thermoluminescence, and kinetic analyses of the main glow peak. The structural properties of lithium aluminium borates improved due to the magnesium dopants used. Differences in the crystallite size and particle size were 38.85-67.35 nm and 50-60 nm, respectively, and these results were obtained from the analyzed X-ray diffractogram and scanning electron spectroscopy. The energy band gaps obtained from the direct transition of borate phosphor materials were within the range of 3.00-4.40 eV, and the doped samples gave a higher energy band gap. A decrease in the TGA (%) exhibited a weight loss or water loss for the undoped, 0.1% Mg, and 0.3% Mg-doped lithium aluminium borate materials. The glow curve measured at a heat rate of 1 °C·s-1 after irradiation to 50 Gy revealed four peaks related to the magnesium doped lithium aluminium borate. The main glow peak was observed at 86 °C. Activation energy was extracted from the main glow peak by using kinetic analysis which involves the initial rise, deconvolution, and variable heating rate approach, and it was approximately 0.67 ± 0.03 eV. A shift in the main glow peak curve from 86 to 110 °C was recognized for the magnesium-doped lithium aluminium borate when it was irradiated from 1 to 300 Gy.
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Affiliation(s)
- Adil Alshoaibi
- Department of Physics, College of Science, King Faisal University, Al Ahsa 31982, Saudi Arabia
- Correspondence: (A.A.); (F.I.E.)
| | - Patrick O. Ike
- Department of Physics and Astronomy, University of Nigeria, Nsukka 410001, Nigeria
- Faculty of Natural Sciences, Caritas University, Amorji-Nike, Enugu 400103, Nigeria
| | - Assumpta C. Nwanya
- Department of Physics and Astronomy, University of Nigeria, Nsukka 410001, Nigeria
| | - Chawki Awada
- Department of Physics, College of Science, King Faisal University, Al Ahsa 31982, Saudi Arabia
| | - Shumila Islam
- Department of Physics, College of Science, King Faisal University, Al Ahsa 31982, Saudi Arabia
| | - Fabian I. Ezema
- Department of Physics and Astronomy, University of Nigeria, Nsukka 410001, Nigeria
- Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation, Somerset West 7129, South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria 0002, South Africa
- Africa Centre of Excellence for Sustainable Power and Energy Development (ACE-SPED), University of Nigeria, Nsukka 410001, Nigeria
- Correspondence: (A.A.); (F.I.E.)
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Ezukwoke N, Oparaku OU, Uzoejinwa BB, Ezema FI, Ezea MO, Omeje SC, Chijindu VC. The effect of polyvinyl alcohol (PVA) on the optical, electrical and solid state properties of copper zinc tin sulfide (CZTS) deposited by sensitive spray pyrolysis (SSP). J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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4
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Ikhioya IL, Udeze C, Ochai-Ejeh FU, Ahmed I, Maaza M, Ezema FI. Optimization of erbium percentage molarity on cobalt selenide semiconductor material via spray pyrolysis deposition technique for photovoltaic application. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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5
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Batool A, Aisida SO, Rufus I, Mahmood A, Ahmad I, Zhao TK, Ezema FI. Tailoring the Microstructural, Optical, and Magnetic Properties of MgFe 2O 4 Nanoparticles Capped Polyethylene Glycol Through a Bio-Inspired Method. J MACROMOL SCI B 2022. [DOI: 10.1080/00222348.2022.2116916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Abeeha Batool
- Centre for High Energy Physics, University of the Punjab, Lahore, Pakistan
- National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
| | - Samson O. Aisida
- National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
- Department of Physics and Astronomy, University of Nigeria Nsukka, Nsukka, Nigeria
- Nanosciences African Network (NANOAFNET), iThemba LABS-National Research, Johannesburg, South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering, Northwestern Polytechnical University, Xi’an, China
| | - Ijeh Rufus
- Department of Physics, University of Delta, Agbor, Nigeria
| | - Arshad Mahmood
- Department of Physics, National Institute of Lasers and Optronics (NILOP), Islamabad, Pakistan
| | - Ishaq Ahmad
- National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering, Northwestern Polytechnical University, Xi’an, China
| | - Ting-kai Zhao
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering, Northwestern Polytechnical University, Xi’an, China
- School of Materials Science & Engineering, Northwestern Polytechnical University, Xi’an, China
| | - Fabian I. Ezema
- Department of Physics and Astronomy, University of Nigeria Nsukka, Nsukka, Nigeria
- Nanosciences African Network (NANOAFNET), iThemba LABS-National Research, Johannesburg, South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa
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6
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Obodo RM, Ramzan M, Nsude HE, Onoh EU, Ahmad I, Maaza M, Ezema FI. Radiations Induced Defects in electrode materials for energy storage devices. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109838] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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7
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Olawole OC, De DK, Oyedepo SO, Ezema FI. Mathematical models for thermionic emission current density of graphene emitter. Sci Rep 2021; 11:22503. [PMID: 34795300 PMCID: PMC8602452 DOI: 10.1038/s41598-021-01546-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 10/29/2021] [Indexed: 11/09/2022] Open
Abstract
In this study, five mathematical models were fitted in the absence of space charge with experimental data to find a more appropriate model and predict the emission current density of the graphene-based thermionic energy converter accurately. Modified Richardson Dushman model (MRDE) shows that TEC's electron emission depends on temperature, Fermi energy, work function, and coefficient of thermal expansion. Lowest Least square value of [Formula: see text] makes MRDE most suitable in modelling the emission current density of the graphene-based TEC over the other four tested models. The developed MRDE can be adopted in predicting the current emission density of two-dimensional materials and also future graphene-based TEC response.
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Affiliation(s)
- Olukunle C. Olawole
- grid.411932.c0000 0004 1794 8359Department of Physics, Covenant University, Ota, Ogun State Nigeria
| | - Dilip K. De
- Sustainable Green Power Technologies, San Antonio, TX USA
| | - Sunday O. Oyedepo
- grid.411932.c0000 0004 1794 8359Department of Mechanical Engineering, Covenant University, Ota, Ogun State Nigeria
| | - Fabian I. Ezema
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, PO Box 392, Pretoria, South Africa ,grid.462638.d0000 0001 0696 719XNanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, PO Box 722, Somerset West, Western Cape Province South Africa ,grid.10757.340000 0001 2108 8257Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria ,grid.10757.340000 0001 2108 8257Africa Centre of Excellence for Sustainable Power and Energy Development (ACE-SPED) University of Nigeria, Nsukka, Nigeria
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8
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Obodo RM, Chibueze TC, Ahmad I, Ekuma CE, Raji AT, Maaza M, Ezema FI. Effects of copper ion irradiation on $${\mathbf{C}\mathbf{u}}_{\mathbf{y}}{\mathbf{Z}\mathbf{n}}_{1-2\mathbf{y}-\mathbf{x}}{\mathbf{M}\mathbf{n}}_{\mathbf{y}}/\mathbf{G}\mathbf{O}$$ supercapacitive electrodes. J APPL ELECTROCHEM 2021. [DOI: 10.1007/s10800-021-01543-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Nwanya AC, Ndipingwi MM, Ezema FI, Iwuoha EI, Maaza M. Bio-synthesized P2-Na0.57CoO2 nanoparticles as cathode for aqueous sodium ion battery. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114600] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Obodo RM, Asjad M, Nwanya AC, Ahmad I, Zhao T, Ekwealor ABC, Ejikeme PM, Maaza M, Ezema FI. Evaluation of 8.0 MeV Carbon (C
2+
) Irradiation Effects on Hydrothermally Synthesized Co
3
O
4
−CuO−ZnO@GO Electrodes for Supercapacitor Applications. ELECTROANAL 2020. [DOI: 10.1002/elan.202060382] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Raphael M. Obodo
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
- National Center for Physics Islamabad 44000 Pakistan
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering Northwestern Polytechnical University Xi'an 710072 China
| | | | - Assumpta C. Nwanya
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
- Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation 1 Old Faure Road Cape Town, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge, P.O. Box 392 Pretoria South Africa
| | - Ishaq Ahmad
- National Center for Physics Islamabad 44000 Pakistan
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering Northwestern Polytechnical University Xi'an 710072 China
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge, P.O. Box 392 Pretoria South Africa
| | - Tingkai Zhao
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering Northwestern Polytechnical University Xi'an 710072 China
- School of Materials Science & Engineering Northwestern Polytechnical University Xi'an 710072 China
| | - A. B. C. Ekwealor
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
| | - Paul M. Ejikeme
- Department of Pure and Industrial Chemistry University of Nigeria Nsukka 410001 Enugu State Nigeria
| | - Maalik Maaza
- Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation 1 Old Faure Road Cape Town, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge, P.O. Box 392 Pretoria South Africa
| | - Fabian I. Ezema
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
- Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation 1 Old Faure Road Cape Town, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge, P.O. Box 392 Pretoria South Africa
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11
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Obodo RM, Onah EO, Nsude HE, Agbogu A, Nwanya AC, Ahmad I, Zhao T, Ejikeme PM, Maaza M, Ezema FI. Performance Evaluation of Graphene Oxide Based Co
3
O
4
@GO, MnO
2
@GO and Co
3
O
4
/MnO
2
@GO Electrodes for Supercapacitors. ELECTROANAL 2020. [DOI: 10.1002/elan.202060262] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Raphael M. Obodo
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
- National Center for Physics Islamabad 44000 Pakistan
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering Northwestern Polytechnical University Xi'an 710072 China
| | - Emmanuel O. Onah
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
| | - Hope E. Nsude
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
| | - Ada Agbogu
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
| | - Assumpta C. Nwanya
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
- Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation 1 Old Faure Road Cape Town, Somerset West 7129 P.O. Box 722, Somerset West Western Cape Province South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge, P.O. Box 392 Pretoria South Africa
| | - Ishaq Ahmad
- National Center for Physics Islamabad 44000 Pakistan
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering Northwestern Polytechnical University Xi'an 710072 China
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge, P.O. Box 392 Pretoria South Africa
| | - Tingkai Zhao
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering Northwestern Polytechnical University Xi'an 710072 China
- School of Materials Science & Engineering Northwestern Polytechnical University Xi'an 710072 China
| | - Paul M. Ejikeme
- Department of Pure and Industrial Chemistry University of Nigeria Nsukka 410001 Nigeria
| | - M. Maaza
- Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation 1 Old Faure Road Cape Town, Somerset West 7129 P.O. Box 722, Somerset West Western Cape Province South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge, P.O. Box 392 Pretoria South Africa
| | - Fabian I. Ezema
- Department of Physics and Astronomy University of Nigeria Nsukka 410001 Enugu State Nigeria
- Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation 1 Old Faure Road Cape Town, Somerset West 7129 P.O. Box 722, Somerset West Western Cape Province South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge, P.O. Box 392 Pretoria South Africa
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Nwankwo MC, Ezealigo B, Nwanya AC, Nkele AC, Agbogu A, Chime U, Asogwa P, Ezekoye B, Ekwealor A, Osuji R, Ejikeme PM, Maaza M, Ezema FI. Syntheses and characterizations of GO/Mn3O4 nanocomposite film electrode materials for supercapacitor applications. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.107983] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Awada C, Whyte GM, Offor PO, Whyte FU, Kanoun MB, Goumri-Said S, Alshoaibi A, Ekwealor ABC, Maaza M, Ezema FI. Synthesis and Studies of Electro-Deposited Yttrium Arsenic Selenide Nanofilms for Opto-Electronic Applications. Nanomaterials (Basel) 2020; 10:nano10081557. [PMID: 32784377 PMCID: PMC7466404 DOI: 10.3390/nano10081557] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/25/2020] [Accepted: 08/01/2020] [Indexed: 11/16/2022]
Abstract
Nanocomposite films grown by incorporating varying concentrations of Yttrium, a d-block rare-earth ion, into the binary chalcogenide Arsenic selenide host matrix is here presented. Films were grown via the wet-chemical electro-deposition technique and characterized for structural, optical, surface morphology, and photoluminescence (PL) properties. The X-ray Diffraction (XRD) result of the host matrix (pristine film) showed films of monoclinic structure with an average grain size of 36.2 nm. The composite films, on the other hand, had both cubic YAs and tetragonal YSe structures with average size within 36.5–46.8 nm. The fairly homogeneous nano-sized films are shown by the Scanning Electron Microscopy (SEM) micrographs while the two phases of the composite films present in the XRD patterns were confirmed by the Raman shifts due to the cleavage of the As-Se host matrix and formation of new structural units. The refractive index peaked at 2.63 within 350–600 nm. The bandgap energy lies in the range of 3.84–3.95 eV with a slight decrease with increasing Y addition; while the PL spectra depict emission bands across the Vis-NIR spectral regions. Theoretically, the density functional theory (DFT) simulations provided insight into the changes induced in the structure, bonding, and electronic properties. Besides reducing the bandgap of the As2Se3, the yttrium addition has induced a lone pair p-states of Se contributing nearby to Fermi energy level. The optical constants, and structural and electronic features of the films obtained present suitable features of film for IR applications as well as in optoelectronics.
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Affiliation(s)
- Chawki Awada
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia; (C.A.); (M.B.K.)
| | - Goodfriend M. Whyte
- Nano Research Laboratory, Department of Physics and Astronomy, University of Nigeria, Nsukka 410001, Nigeria; (G.M.W.); (A.B.C.E.)
| | - Peter O. Offor
- Metallurgicaland Materials Engineering Department, University Nigeria, Nsukka 410001, Nigeria; (P.O.O.); (F.U.W.)
| | - Favour U. Whyte
- Metallurgicaland Materials Engineering Department, University Nigeria, Nsukka 410001, Nigeria; (P.O.O.); (F.U.W.)
| | - Mohammed Benali Kanoun
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia; (C.A.); (M.B.K.)
| | - Souraya Goumri-Said
- College of Science, Department of Physics, Alfaisal University, P.O. Box 50927, Riyadh 11533, Saudi Arabia;
| | - Adil Alshoaibi
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia; (C.A.); (M.B.K.)
- Correspondence: (A.A.); (F.I.E.)
| | - Azubike B. C. Ekwealor
- Nano Research Laboratory, Department of Physics and Astronomy, University of Nigeria, Nsukka 410001, Nigeria; (G.M.W.); (A.B.C.E.)
| | - Malik Maaza
- Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, P.O. Box 722, Somerset West 7129, Western Cape Province, South Africa; or
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), P.O. Box 392, Muckleneuk Ridge, Pretoria 0001, South Africa
| | - Fabian I. Ezema
- Nano Research Laboratory, Department of Physics and Astronomy, University of Nigeria, Nsukka 410001, Nigeria; (G.M.W.); (A.B.C.E.)
- Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, P.O. Box 722, Somerset West 7129, Western Cape Province, South Africa; or
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), P.O. Box 392, Muckleneuk Ridge, Pretoria 0001, South Africa
- Correspondence: (A.A.); (F.I.E.)
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Aisida SO, Alnasir MH, Botha S, Bashir A, Bucher R, Ahmad I, Zhao TK, Maaza M, Ezema FI. The role of polyethylene glycol on the microstructural, magnetic and specific absorption rate in thermoablation properties of Mn-Zn ferrite nanoparticles by sol–gel protocol. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109739] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Obodo RM, Nwanya AC, Iroegbu C, Ezekoye B, Ekwealor A, Ahmad I, Maaza M, Ezema FI. Effects of swift copper (Cu2+) ion irradiation on structural, optical and electrochemical properties of Co3O4-CuO-MnO2/GO nanocomposites powder. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.02.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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16
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Nkele AC, Chime UK, Asogwa L, Nwanya AC, Nwankwo U, Ukoba K, Jen T, Maaza M, Ezema FI. A study on titanium dioxide nanoparticles synthesized from titanium isopropoxide under SILAR-induced gel method: Transition from anatase to rutile structure. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2019.107705] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Aisida SO, Ahmad I, Zhao TK, Maaza M, Ezema FI. Calcination Effect on the Photoluminescence, Optical, Structural, and Magnetic Properties of Polyvinyl Alcohol Doped ZnFe2O4 Nanoparticles. J MACROMOL SCI B 2020. [DOI: 10.1080/00222348.2020.1713519] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Samson O. Aisida
- Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria
- National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa
| | - Ishaq Ahmad
- National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering, Northwestern Polytechnical University, Xi’an, China
| | - Ting-kai Zhao
- NPU-NCP Joint International Research Center on Advanced Nanomaterials and Defects Engineering, Northwestern Polytechnical University, Xi’an, China
- School of Materials Science & Engineering, Northwestern Polytechnical University, Xi’an, China
| | - Malik Maaza
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa
| | - Fabian I. Ezema
- Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa
- Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa
- Department of Physics, Faculty of Natural and Applied Sciences, Coal City University, Enugu, Nigeria
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18
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Ezealigo BN, Nwanya AC, Simo A, Bucher R, Osuji RU, Maaza M, Reddy M, Ezema FI. A study on solution deposited CuSCN thin films: Structural, electrochemical, optical properties. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2017.04.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Nwankwo U, Ngqoloda S, Nkele AC, Arendse CJ, Ozoemena KI, Ekwealor ABC, Jose R, Maaza M, Ezema FI. Effects of alkali and transition metal-doped TiO2 hole blocking layers on the perovskite solar cells obtained by a two-step sequential deposition method in air and under vacuum. RSC Adv 2020; 10:13139-13148. [PMID: 35492092 PMCID: PMC9051458 DOI: 10.1039/d0ra01532f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 03/24/2020] [Indexed: 11/21/2022] Open
Abstract
Planar perovskite solar cells (PPSCs) have received great attention in recent years due to their intriguing properties, which make them a good choice for photovoltaic applications. In this work, the effect of alkali and transition metal-doped TiO2 (cesium-doped TiO2 (Cs-TiO2) and yttrium-doped TiO2 (Y-TiO2)) compact layers on the optical, structural and the photovoltaic performance of the PPSCs have been investigated. The perovskite layer syntheses were carried out by depositing a lead iodide (PbI2) layer via spin-coating; converting PbI2 into methyl ammonium iodide (CH3NH3PbI3) by chemical vapor deposition (CVD) and spin-coating at 60 min and 60 s conversion times respectively. The as-deposited PPSCs were studied layer-by-layer using an X-ray diffractometer, scanning electron microscope, and UV-vis diffuse reflectance, transmittance and absorbance. The power conversion efficiency for stable processed perovskite solar cells were 3.61% and 12.89% for air and vacuum processed, respectively. Planar perovskite solar cells (PPSCs) have received great attention in recent years due to their intriguing properties, which make them a good choice for photovoltaic applications.![]()
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Affiliation(s)
- U. Nwankwo
- Department of Physics and Astronomy
- University of Nigeria Nsukka
- Nigeria
- Department of Physics/Geology/Geophysics
- Alex Ekwueme Federal University Ndufu-Alike
| | - Siphelo Ngqoloda
- Department of Physics and Astronomy
- University of the Western Cape
- Bellville
- South Africa
| | - Agnes C. Nkele
- Department of Physics and Astronomy
- University of Nigeria Nsukka
- Nigeria
| | | | - Kenneth I. Ozoemena
- Molecular Sciences Institute
- School of Chemistry
- University of the Witwatersrand
- Johannesburg 2050
- South Africa
| | - A. B. C. Ekwealor
- Department of Physics and Astronomy
- University of Nigeria Nsukka
- Nigeria
| | - Rajan Jose
- Nanostructured Renewable Energy Materials Laboratory
- Faculty of Industrial Sciences and Technology
- Universiti Malaysia Pahang
- 26300 Kuantan
- Malaysia
| | - Malik Maaza
- Nanosciences African Network (NANOAFNET)
- iThemba LABS-National Research Foundation
- Somerset West
- South Africa
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology
| | - Fabian I. Ezema
- Department of Physics and Astronomy
- University of Nigeria Nsukka
- Nigeria
- Nanosciences African Network (NANOAFNET)
- iThemba LABS-National Research Foundation
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Aisida SO, Akpa PA, Ahmad I, Zhao TK, Maaza M, Ezema FI. Bio-inspired encapsulation and functionalization of iron oxide nanoparticles for biomedical applications. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2019.109371] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Madubuonu N, Aisida SO, Ali A, Ahmad I, Zhao TK, Botha S, Maaza M, Ezema FI. Biosynthesis of iron oxide nanoparticles via a composite of Psidium guavaja-Moringa oleifera and their antibacterial and photocatalytic study. Journal of Photochemistry and Photobiology B: Biology 2019; 199:111601. [DOI: 10.1016/j.jphotobiol.2019.111601] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/23/2019] [Accepted: 08/20/2019] [Indexed: 01/04/2023]
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Nwanya AC, Razanamahandry LC, Bashir AKH, Ikpo CO, Nwanya SC, Botha S, Ntwampe SKO, Ezema FI, Iwuoha EI, Maaza M. Industrial textile effluent treatment and antibacterial effectiveness of Zea mays L. Dry husk mediated bio-synthesized copper oxide nanoparticles. J Hazard Mater 2019; 375:281-289. [PMID: 31078988 DOI: 10.1016/j.jhazmat.2019.05.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 04/14/2019] [Accepted: 05/02/2019] [Indexed: 05/02/2023]
Abstract
Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu2O nanoparticles were obtained for the first time via this simple, eco- friendly, green synthesis route. The Cu2O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36-73 nm and 30-90 nm for the unannealed Cu2O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and textile effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu2O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.
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Affiliation(s)
- Assumpta Chinwe Nwanya
- Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria; UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, South Africa; Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West, PO Box 722, 7129, Somerset West, South Africa.
| | - Lovasoa Christine Razanamahandry
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, South Africa; Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West, PO Box 722, 7129, Somerset West, South Africa
| | - A K H Bashir
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, South Africa; Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West, PO Box 722, 7129, Somerset West, South Africa
| | - Chinwe O Ikpo
- Sensor Lab, Department of Chemistry, University of the Western Cape, Bellville, 7535, Cape Town, South Africa
| | - Stephen C Nwanya
- Department of Mechanical Engineering, University of Nigeria, Nsukka, Nigeria
| | - Subelia Botha
- Electron Microscope Unit, University of the Western Cape, South Africa
| | - S K O Ntwampe
- Bioresource Engineering Research Group (BioERG), Faculty of Applied Science Department of Biotechnology Cape Peninsula University of Technology, P.O. Box 652, Cape Town, 8000, South Africa
| | - Fabian I Ezema
- Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria; UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, South Africa; Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West, PO Box 722, 7129, Somerset West, South Africa
| | - Emmanuel I Iwuoha
- Sensor Lab, Department of Chemistry, University of the Western Cape, Bellville, 7535, Cape Town, South Africa
| | - Malik Maaza
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, South Africa; Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West, PO Box 722, 7129, Somerset West, South Africa
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Nwanya AC, Ndipingwi MM, Mayedwa N, Razanamahandry L, Ikpo CO, Waryo T, Ntwampe S, Malenga E, Fosso-Kankeu E, Ezema FI, Iwuoha EI, Maaza M. Maize (Zea mays L.) fresh husk mediated biosynthesis of copper oxides: Potentials for pseudo capacitive energy storage. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.01.186] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Offor PO, Nwanya AC, Omah AD, Daniel-Mkpume CC, Maaza M, Okorie BA, Ezema FI. Chemical spray pyrolysis deposition of zinc sulphide thin films using ethylenediaminetetraacetic acid disodium salt complexant. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3668-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nwanya AC, Obi D, Ozoemena KI, Osuji RU, Awada C, Ruediger A, Maaza M, Rosei F, Ezema FI. Facile Synthesis of Nanosheet-like CuO Film and its Potential Application as a High-Performance Pseudocapacitor Electrode. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.03.064] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Nwanya AC, Jafta CJ, Ejikeme PM, Ugwuoke PE, Reddy M, Osuji RU, Ozoemena KI, Ezema FI. Electrochromic and electrochemical capacitive properties of tungsten oxide and its polyaniline nanocomposite films obtained by chemical bath deposition method. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2013.10.002] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ezekoye BA, Ezema FI, Ezekoye VA, Offor PO, Uduh U. Synthesis, structural and surface morphological characterizations of sulfated zirconia Nanoparticles via chemical route. Nig J Tech 2014. [DOI: 10.4314/njt.v33i1.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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