| Email: | Click to show Okereke's Email Address | Birthday: | 1st January |
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| Staff Type: | Phone Number: | Login to view phone number | |
| Website or LinkedIn URL: | Gender: | Male | |
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| Biography: | |||
| Faculty/Department/Unit: | Industrial Physics | Rank: | Professor |
| Research Interest: | • Solid State Physics • Material Science • Experimental Physics • Solar Energy • Nanotechnology | ||
| Educational Qualifications: | • West African School Certificate 1984 • N.C.E (Maths/Physics) 1987 • B.Sc. Physics/Education 1992 • M.Sc. physics (Solid State Physics) 2005 • Ph.D. Physics (Solid State Physics) 2012 |
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| Universities Attended: | • University of Nigeria, Nsukka 1988-1992 • Nnamdi Azikiwe University, Awka 2000-2005 • Nnamdi Azikiwe University, Awka 2006-2012 |
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| Publications: | Publications: I. Journal articles (International) [1] N. A. Okereke and A .J. Ekpunobi (2010), Structure and Optical Properties of Chemically Deposited Tin Selenide Film, Chalcogenide Letters, Vol. 7 (9), 531-538. [2] N. A. Okereke and A .J. Ekpunobi (2010), Structural, Optical Properties and Applications of Chemically Deposited Lead Selenide Thin Films, Journal of Ovonic Research, Vol. 6 (6), 277-278. [3] Okereke N.A. and Ekpunobi A. J. (2011), Chemical bath deposited barium selenide films–Structural and optical properties, Chalcogenide Letters, Vol. 8(1), 9-14. [4] N. A. Okereke and A .J. Ekpunobi (2011), Zinc selenide buffer layer deposition for solar cell application, Journal of Non-Oxide Glasses, Vol. 3(1), 31-36. [5] N. A. Okereke and A .J. Ekpunobi (2011), Structural and electrical characteristics of silver selenide thin films, Journal of Optoelectronics and Biomedical Material, Vol. 3(2), 51-55. [6] N. A. Okereke and A .J. Ekpunobi (2011), Structural and optical characterization studies of chemically synthesized cadmium selenide thin films, Chalcogenide Letters, Vol.8 (6), 377-381 [7] N. A. Okereke and A .J. Ekpunobi (2011), Spectroscopic studies on lead selenide (PbSe) and tin selenide (SnSe) thin films by Journal of Optoelectronics and Biomedical Materials, Vol. 3(3), 69-74. [8] N. A. Okereke and A .J. Ekpunobi (2011), XRD and UV-VIS-IR studies of chemically-synthesized copper selenide thin films by Research Journal of Chemical Sciences, Vol.1 (6), 64-70. [9] N. A. Okereke, I. A. Ezenwa and A. J. Ekpunobi (2011), Effect of thickness on the optical properties of zinc selenide thin films, Journal of Non-Oxide Glasses, Vol. 3(3), 105-111. [10] N. A. Okereke and A.J. Ekpunobi (2011), Effect of deposition time on chemical bath deposition process and thickness of BaSe thin films, Journal of Optoelectronics and Biomedical Materials, Vol. 3(4), 81-85. [11] I. A. Ezenwa, N. A. Okereke and N. J. Egwunyenga (2012), Optical properties of chemical bath deposited Ag2S thin films, International Journal of Science and Technology Vol. 2(3), 100-106. [12] M.O. Olikagu and N. A. Okereke (2012), The attitude of final year students towards learning of physics in Ihiala Local Government Area of Anambra Nigeria, Journal of Science and Arts, 1(18), 85- 92 [13] N. A. Okereke, I. A. Ezenwa and A.J. Ekpunobi (2012), Effect of complexing agent (Tea) on chemically deposited silver selenide thin films, International Journal of Science and Tech. Vol. 2(4), 155-158. [14] N. A. Okereke and A.J. Ekpunobi (2012), Influence of thickness on the structural and optical properties of cadmium selenide thin films, Palegia Research Library, Advances in Applied Science Research, Vol. 3(3), 1244-1249. [15] Ezenwa I.A. and Okereke N.A. (2012), Effect of ligand on the absorbance and transmittance of chemically bath deposited Zinc Sulphide thin film, Palegia Research Library, Advances in Applied Science Research, Vol. 3(5), 2821-2825. [16] E. Ezeobele, N. A. Okereke and I. A. Ezenwa (2013), Effect of bath temperature on the optical properties of aluminiun sulphide films, International Journal of Science and Technology, Vol. 3(4), 201-204. [17] Ezenwa I.A, Okereke N.A and Okoli L.N. (2013), Optical properties of copper selenide thin film, International Research Journal of Engineering Science, Technology and Innovation (IRJESTI), Vol. 2(5), 82-87. [18] N.A Okereke and A. J Ekpunobi (2013), Investigation of pH effect on chemically synthesized tin selenide films, Moldavian Journal of Physical Sciences, 12(1-2), 39-43. [19] Ezenwa I.A, Okereke N.A. and Okoli L.N. (2013), Electrical Properties of Copper Selenide Thin Film, IPASJ International Journal of Electrical Engineering (IIJEE), 1(6), 1-4. [20] Okereke N.A. and Ezenwa I.A. (2015), Spectral Analysis and Applications of CuNiS Films. International Educational Scientific Research Journal (IESRJ), Vol. 1(2), 2015. [21] Okereke N.A. (2015), Effect of Dip Time on the Structural and Optical Properties of CuAlSe2 Films International Educational Scientific Research Journal (IESRJ), 1(2), 34-36. [22] G.C.Nworji, P.U.Okoye, U.V. Okpala, and A.N. Okereke (2020), Comparative Analysis of Voltage, Current and Power Produced in a Piezoelectric System from Human Foot Beats, Journal of Energy Research and Reviews, 4 (4), 10 - 22. [23] G. C. Nworji , U.V. Okpala, N. A. Okereke and P. U. Okoye (2020), Effect of Time Factor on the Battery Voltage State of Charge from Foot Beats Piezoelectric System, Asian Journal of Research and Reviews in Physics 3(4), 53 - 64. [24] Nwori A. N., Ezenwaka L. N., Ottih I. E., Okereke N. A.,., Okoli N. L., (2021), Optical, Electrical, Structural and Morphological Properties of Electrodeposited CdMnS Thin Film Semiconductors for Possible Device Applications, Journal of Physics and Chemistry of Materials, 8 (1), 1- 11. [25] Nwori A. N., Ezenwaka L. N., Ottih I. E., Okereke N. A., Umeokwonna N. S., Okoli N. L. and Obimma I.O. (2021), Effect of Deposition Voltage on the Optical Properties of PbMnS Thin Films Deposited by Electrodeposition Method. Journal of Physics and Chemistry of Materials, 8 (3), 12-22. [26] Nwori A. N., Ezenwaka L. N., Ottih I. E., Okereke N. A., Umeokwonna N. S., Okoli N. L. and Obimma I.O. (2021), Study of the Optical and Solid- State Properties of Copper Manganese Sulphide (CuMnS) Thin Film Semiconductors for Possible Optoelectronics Applications. Journal of Physics and Chemistry of Materials, 8 (3), 23-33. [27] Ezenwaka L. N., Okoli N. L., Okereke N. A., Ezenwa I, A. and Nwori (2021), Properties of Electrosynthesized Cobalt Doped Zinc Selenide Thin Film Deposited at Varying Time. Nanoarchitectonics, 3(1), 1-17. [28] L.N. Ezenwaka, A. N. Nwori, I. E. Ottih, N. A. Okereke, and Nonso Livinus Okoli, (2021), “Investigation of Optical, Structural and Compositional Properties of Electrodeposited Lead Manganese Sulphide (PbMnS) Thin Films for Possible Device Applications”, Nanoarchitectonics., 3(1), 18-32 [29] Nwori A. N., Ezenwaka L. N, Ottih E. I.1, Okereke N. A., Okoli N. L. (2021), Study of the Optical, Electrical, Structural and Morphological Properties of Electrodeposited Lead Manganese Sulphide (PbMnS) Thin Film Semiconductors for Possible Device Applications. Journal of Modern Materials, 8(1), 40-51. [30] Nwori A.N., Ezenwaka L.N., Ottih E.I., Okereke A.N. and Okoli N.L.(2022), The Study of the Optical, Structural and Morphological Properties of Electrodeposited Copper Manganese Sulfide (CuMnS) Thin Films for Possible Device Applications, Trends in Sciences; 19(17), 5747. [31] Nonso Livinus Okoli, Laz Nnadozie Ezenwaka, Ngozi Agatha Okereke, Ifeyinwa Amaka Ezenwa and Nwode Augustine Nwori (2022), Investigation of Optical, Structural, Morphological and Electrical Properties of Electrodeposited Cobolt Doped Copper Selenide (Cu1-xCoxSe) Thin Films. Trends in Sciences; 19(16): 5686. [32] A.N. Nwori, N.L. Okoli, N.A. Okereke, I.E. Ottih and L.N. Ezenwaka. (2022), Optical Properties of Electrodeposited CdMnS Thin Film Semiconductor Alloys for Optoelectronics Applications: Effect of Deposition Potential. Journal of Nano and Material Science Research 1, 59-67. [33] Elekalachi, C. I1*, Ezenwa, I. A1, Okereke, A. N1, Okoli, N. L2 , Nwori, A. N. (2022), Influence of Annealing Temperature on the Properties of SILAR Deposited CdSe/ZnSe Superlattice Thin Films for Optoelectronic Applications. Nanoarchitectonics., 4(1), 26- 44. http://ojs.wiserpub.com/index.php/NAT/ [34] Uchechukwu Anthony Kalu, Okpala Uchechukwu Valentine, Okereke Ngozi Agatha, Nwori Augustine Nwode, (2023) "Structural and Optical Properties of Black Velvet Tamarind Doped Magnesium Sulfide Thin Films Grown by Sol-Gel Technique," Journal of Physics and Chemistry of Materials, Vol.10, Issue.4, pp.1-9. [35] Uchechukwu Anthony Kalu, Okpala Uchechukwu Valentine, Okereke Ngozi Agatha, Nwori Augustine Nwode, (2023) "Effect of Black Velvet Tamarind Doping on the Optical and Structural Properties of Sol-Gel Grown ZnS Thin Film Crystals," International Journal of Scientific Research in Multidisciplinary Studies, Vol.9, Issue.12, pp.1-9. [36] G.O.Chimezie, c. c. Onuchukwu and N.A. Okereke (2024), Determination of Pathloss Exponent 4G LTE Signal in Urban and Rural Environment of Southern Nigeria (Delta and Anambra States). Asian Basic and Applied Journal, Vol, 6(1), pp. 20-35. Publications: II. Journal articles (Local) [37] N. A. Okereke and A .J. Ekpunobi (2010), Structural and Optical Studies of Chemical Bath Deposited Lead Selenide thin films, Journal of Basic Physical Research, Vol.1 (1), 37-40. [38] I. A. Ezenwa, N. A. Okereke and N.S Umeokwonna (2010), Effects of pH on the optical properties of solution grown cadmium selenide thin films, Journal of Basic Physical Research, Vol.1 (1), 9 - 12. [39] N. A. Okereke, I. A. Ezenwa and A.J. Ekpunobi (2010), Effects of bath parameters on thicknesses of chemical bath deposited copper selenide thin films, Natural and Applied Sciences Journal, Vol.11 (2), 170-173. [40] I. A. Ezenwa and N. A. Okereke (2011), Optical properties of cadmium sulphide (CdS), copper sulphide (CuS) and CdS/CuS thin films and their application in photovoltaic technology, Nigerian Journal of Solar Energy, Vol. 22, 61-65. [41] N.A. Okereke and A.J. Ekpunobi (2012), Studies of chemical bath deposited zinc selenide (ZnSe) thin films, Nigeria Journal of Solar Energy, Vol. 23, 101-105. [42 ] Ezenwaka L.N., Okereke N.A. and Odezue O.O. (2014), Effect of pH on Chemical Bath Deposited Copper Nickel Selenide (CuNiSe) Thin Films, COOU Interdisciplinary Research Journal, Vol. 1 (1), 87-92. [43] Ezenwa I.A., Okereke N.A. and Okoli L.N. (2017), Comparative analysis of the absorbance spectra of copper sulphide, cadmium sulphide and cadmium sulphide/copper sulphide films, COOU Journal of Multidisciplinary Studies, Vol.1 (1), 69-76. [44] Okereke N.A. and Ezenwa I.A. (2017), Bath temperature effects on optical measurement of silver sulfide thin films synthesized by chemical bath deposition technique, COOU Journal of Multidisciplinary Studies, Vol.1 (1), 133-139. [45] Ezenwa I. A., Okereke N. A., Okoli N. L. and Ike C. E. (2019), Optical, morphological and structural studies of chemical bath fabricated tin oxide thin films, COOU Journal of Physical Sciences, 1(2), 28-36. [46] Okereke N.A., Ezenwa I.A., Okoli L.N. and Opara C. U. (2019), Optical properties of chemically deposited copper nickel selenide (CuNise) films, COOU Journal of Physical Sciences, 1 (2), 147-154. [47] Okereke N.A., Ezenwa I.A. and Ejimofor F.O. (2019), Influence of Molar Concentration of Nickel (Ni) on Optical Properties of Copper Nickel Sulfide (CuNiS) Thin Films, COOU Journal of Physical Sciences, 2(2), 20-27. [48] Ezenwa I. A., Okoli N. L., Okereke N. A. and Nnamdi C. (2019), Effect of Complexing Agent on Tin Selenide (SnSe) Thin Film Prepared by Solution Growth Technique in an Alkaline Bath, Nigerian Journal of Solar Energy, 30 (1), 58- 64. III. Published Conference Proceedings. [49] Odezue O., Okereke N.A. and Ezenwaka L. (2014), Effect of pH on chemical Bath deposited Nickel Selenide (NiSe) thin films; Proceedings of the 1st African International Conference/Workshop: African International Conference /Workshop on Applications of Nanotechnology to Energy, Health and Environment, UNN, 23-29. [50] Okereke N.A. (2016), Investigation of bath temperature effect on the properties of Copper Aluminum Selenide (CuAlSe2) films. Proceedings from the 2nd Nanotechnology Conference/Workshop: African International Conference /Workshop on Applications of Nanotechnology to Energy, Environment, and Health, UNN, 2016. [51] C.C. Umeokafor and N.A.Okereke. (2017), Electrodeposition of nanocrystalline copper aluminium oxide (CuAlO2) thin films. Proceedings of the Conference of FAPSCON, 45-58. [52] B.C. Muomerili and N.A. Okereke (2017), Effect of thermal annealing on optical properties of electro-deposited silver aluminium selenide thin films, Proceedings of Conference of FAPSCON, 59-71. [53] Ezenwa I. A., Okoli N. L., Okereke N. A. and Ezenwanne M. O. (2018), Deposition and Optical Characterization o f NiO Thin Films Fabricated by Chemical Bath Method, Proceedings on 3rd African Conference/Workshop : An International Conference on All Aspects of Nanotechnology, UNN, 44- 51. IV. Conference Papers [54] Okereke N. A. Okeke C.E. and Ekpunobi A. J., Chemical bath deposition of crystalline Copper Selenide (CuSe) thin films, Paper presented at the National Solar Energy Forum, NASEF 2005, University of Benin, Benin City, Nigeria, 7th – 9th December 2005. [55] Okereke N. A., Okeke C.E. and Ezema F. I., Chemical bath deposition of crystalline Silver Selenide (Ag2Se) thin films, Paper presented at the National Solar Energy Forum, NASEF 2006 , Nnamdi Azikiwe University, Awka, Anambra State, Nigeria, 6th- 9th December 2006. [56] Okereke N. A. and Ekpunobi A. J., Effect of bath parameters on chemically deposited Copper Selenide (CuSe) thin films, Paper presented at the National Conference of the Nigerian Institute of Physics, NIP 2008, Federal University of Technology, Owerri, Nigeria, 15th – 18th October, 2008. [57] Okereke N. A. and Ekpunobi A. J., Chemical Bath Deposited ZnSe thin films for solar cell applications, Paper presented at the National Solar Energy Forum, NASEF 2010, Federal University of Technology, Owerri, Imo State, Nigeria, 3rd– 6th November, 2010. [58] Okereke N. A., Okoli L. N. and Umeokafor C. C., Investigation of Morphological Properties of Electrodeposited Copper Aluminum Oxide ( CuAlO2) thin films, Paper presented at the 36th National Solar Energy Forum, NASEF 2018 held at University of Nigeria Nsukka, Enugu State, Nigeria, 12th– 14th November, 2018. [59] Okoli N. L., Chika Onuchukwu, Ezenwaka Laz. N. and Ngozi A. Okereke, Theoretical Determination of the Electronic Structure and Optical Properties of Transition Metal Chalcogenides (TMC) – A Review, Paper presented at the International Conference, Faculty of Physical Science, (FAPSCON 2019), Chukwuemeka Odumegwu Ojukwu University, October 2019. [60] Okereke N. A. , Okoli L. N. and Muomerili B. C., Synthesis and Characterization of Silver Aluminum Selenide (AgAlse2) Thin Film Using Electrochemical Deposition Method, Paper presented at the 42nd Annual Conference of Nigerian Institute of Physics (NIP), Federal University of Technology, Owerri, Imo State, Nigeria, 18th - 22nd November, 2019. [61 Muomerili B. C. and Okereke N.A., Synthesis and Characterization of Silver Aluminum Selenide (AgAlse2) Absorbent Materials Prepared by Electrodeposition Technique, Paper presented at the 43rd Annual Conference of Nigerian Institute of Physics (NIP), Nnamdi Azikiwe University Awka, Anambra State, Nigeria, 22nd - 25th September, 2021. V. Books [1] Okereke N.A. (2008), Easy to Use Practical Physics Manual (With Theoretical Background) for Preparation of WASSCE, NECO and NABTEB Examinations Jo-Gene International Ltd, ISBN 978-075-705-8. [2] Okereke N.A. (2012), In Introductory Thermodynamics for Undergraduates, Homer and Hammer (Nig.) Ltd, Onitsha. ISBN 978-978-48281-1-6. |
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