Influence of Bath pH values on the Structural and Optical Properties of Electrodeposited MgO Thin Films for Optoelectronic applications


  • S. C. Onuegbu Department of Physics, Alex Ekwueme Federal University, Ndufu-Alike, Ebonyi state, Nigeria
  • S. S. Oluyamo Department of Physics, Federal University of Technology, Akure, Nigeria
  • O. I. Olusola Department of Physics, Federal University of Technology, Akure, Nigeria


MgO thin films, Bath pH, Electrodeposition


This paper investigates the influence of bath pH values on the structural and optical properties of magnesium oxide (MgO) thin films synthesized using electrodeposition technique. The films were deposited on conductive fluorine tin oxide (FTO) substrates using magnesium nitrate hexahydrate as a precursor material. The structural, morphological and optical properties of the electrodeposited films were examined by scanning electron microscopy (SEM), X-ray diffraction and UV-Vis spectrophotometer. The morphology and optical properties of the films were found to vary with bath pH values. The band gap decreased as the bath pH values increased. The deposited MgO films exhibited average transmittance of 80%, 50%, and 25% with thicknesses 400 nm, 480 nm, and 540 nm for bath pH values of 2.0, 5.0, and 9.0, respectively. The results obtained indicate that bath pH values play significant role in the formation of MgO films and can be used to tune the material into useful optoelectronic applications.


H. Zulkefle, L. N. Ismail, R. Abu Bakar, and M. R. Mahmood, ”Molar concentration effect on MgO thin films properties”, IEEE Symp. Ind. Electron. Appl. ISIEA 2011 2011 (2011) 468. doi:10.1109/ISIEA.2011.6108754. DOI:

H. W. Kim and S. H. Shim, ”Growth of MgO nanowires assisted by the annealing treatment of Au-coated substrates”, Chemical physics letters 422 (2006) 165. doi:10.1016/j.cplett.2006.02.062. DOI:

Khalil, Khaled D., Ali H. Bashal, Mohammed Khalafalla, and Ayman A. Zaki. ”Synthesis, structural, dielectric and optical properties of chitosan-MgO nanocomposite”, Journal of Taibah University for Science 14 (2020) 975. DOI:

Wan, Yimao, Chris Samundsett, James Bullock, Mark Hettick, Thomas Allen, Di Yan, Jun Peng et al. ”Conductive and stable magnesium oxide electron-selective contacts for efficient silicon solar cells.” Advanced Energy Materials 7 (2017) 1601863. DOI:

Peiris, TA Nirmal, Ajay K. Baranwal, Hiroyuki Kanda, Shouta Fukumoto, Shusaku Kanaya, Takeru Bessho, Ludmila Cojocaru, Tsutomu Miyasaka, Hiroshi Segawa, and Seigo Ito. ”Effect of electrochemically deposited MgO coating on printable perovskite solar cell performance.” Coatings 7 (2017) 36. DOI:

T. Zhu and L. Lu, ”Orientation of MgO thin films on Si(001) prepared by pulsed laser deposition”, Adv. Mater. Micro- Nano-Systems 1 (2003) 1.

N. M. A. Hadia, M. Alzaid, and W. S. Mohamed, ”Materials Characterization Tailoring the physical properties of low dimensional MgO nanostructures using vapor transport deposition”, Mater. Charact 165 (2020) 110392. doi:10.1016/j.matchar.2020.110392. DOI:

J. Pachiyappan, N. Gnanasundaram, and G. L. Rao, ”Preparation and characterization of ZnO, MgO and ZnO–MgO hybrid nanomaterials using green chemistry approach” Results Mater 7 (2020) 100104. doi:10.1016/j.rinma.2020.100104. DOI:

Sagadevan, Suresh, S. Venilla, A. R. Marlinda, Mohd Johan, Yasmin Abdul Wahab, Rozalina Zakaria, Ahmad Umar, Hosameldin H. Hegazy, H. Algarni, and Naushad Ahmad. ”Effect of synthesis temperature on the morphologies, optical and electrical properties of MgO nanostructures.” Journal of nanoscience and nanotechnology 20 (2020) 2488. DOI:

V. Yuniar and E. Yufita, “Structural and optical properties of MgO- doped TiO 2 prepared by sol-gel method Structural and Optical Properties of MgO-doped TiO 2 Prepared by Sol-Gel Method”, AIP Conference Proceedings 2221 (2020) 110007. DOI:

G. Balakrishnan, R. Velavan, K. M. Batoo, and E. H. Raslan, “Results in Physics Microstructure , optical and photocatalytic properties of MgO nanoparticles”, Results Phys. 16 (2020) 103013. doi:10.1016/j.rinp.2020.103013. DOI:

Z. Habibah, L. N. Ismail, R. A. Bakar, and M. Rusop, “Influence of heat treatment on the properties of MgO thin films as dielectric layer”, Proc. - 2011 IEEE Student Conf. Res. Dev. SCOReD 16 (2011) 19. doi: 10.1109/SCOReD.2011.6148700 DOI:

Sharma, J., Sharma, M. and Basu, S., “Synthesis of meso- porous MgO nanostructures using mixed surfactants template for enhanced adsorption and antimicrobial activity”, Journal of Environ-mental Chemical Engineering 5 (2017) 3429. DOI:

Umar, A., Al-Hazmi, F., Dar, G. N., Zaidi, S.A.M., Al-Tuwirqi, R., Alnowaiser, F., Al-Ghamdi, A.A. and Hwang, S.W., “Ultra- sensitive ethanol sensor based on rapidly synthesized Mg(OH)2 hexagonal nano disks Sensors and Actuators”, Chemical 166 (2012) 97. DOI:

Al-Hazmi, F., Umar, A., Dar, G.N., Al-Ghamdi, A.A., Al-Sayari, S.A., Al-Hajry, A., Kim, S.H., Al-Tuwirqi, R.M., Alnowaiser, F. and El-Tantawy, F., “Microwave-assisted rapid growth of Mg(OH)2 nanosheet networks for ethanol chemical sensor application” Journal of Alloys and Compounds 519 (2012) 4. DOI:

Salem, A.N.M., Ahmed, M.A. and El-Shahat, M.F., “Selective adsorption of amaranth dye on Fe3O4/MgO nanoparticles”, Journal of Molecular Liquids 219 (2016) 780. DOI:

W. C. Shih, T. L. Wang, M. H. Chiang, and M. S. Wu, “Preparation and characterization of highly c-axis textured MgO buffer layer grown on Si(100) substrate by RF magnetron sputtering for use as growth template of ferroelectric thin film”, J. Mater. Sci. Mater. Electron 22 (2011) 430. doi: 10.1007/s10854-010-0155-2. DOI:

S. V. R. Venkatachalapathy and M. H. R. Murugesan, “Characterization of MgO thin film prepared by spray pyrolysis technique using perfume atomizer”, J. Mater. Sci. Mater. Electron 31 (2020) 17. doi:10.1007/s10854-020-04046-7. DOI:

Y. R. Denny, T. Firmansyah, V. Gustiono, and S. S. Lee, “Effect of Substrate Temperature on the Electronic Properties of MgO Thin Films on Si ( 100 ) Grown by Electron Beam Evaporation”, Key Engineering Materials 841 (2020) 243. doi10.4028/ DOI:

Abed C., S. Fernández, and H. Elhouichet, “Optik Studies of optical properties of ZnO : MgO thin films fabricated by sputtering from home-made stable oversize targets”, Opt. Int. J. Light Electron Opt. 216 (2020) 164934. DOI:

Al-Gaashani, R., Radiman, S., Al-Douri, Y., Tabet, N. and Daud, A.R., 2012. “Investigation of the optical properties of Mg(OH)2 and MgO nanostructures obtained by microwave-assisted methods” Journal of Alloys and Compounds 521 (2012) 71. DOI:

Zhao, M., Chen, X.L., Zhang, X.N., Li, H., Li, H.Q. and Wu, L., 2004. “Preparation and characterization of networked rectangular MgO nanostructures”, Chemical Physics Letter 388 (2004) 711. DOI:

J. Li, Y. Jiang, Y. Li, D. Yang, Y. Xu, and M. Yan, “Origin of room temperature ferromagnetism in MgO films”, Appl. Phys. Lett. 102 (2013) 7. doi: 10.1063/1.4793308. DOI:

J. H. Boo, S. B. Lee, K. S. Yu, W. Koh, and Y. Kim, “Growth of magnesium oxide thin films using single molecular precursors by metal-organic chemical vapor deposition”, Thin Solid Films 341 (1999) 63. doi:10.1016/S0040-6090(98)01524-7. DOI:

M. Kapilashrami, J. Xu, K. V. Rao, L. Belova, E. Carlegrim, and M. Fahlman, “Experimental evidence for ferromagnetism at room temperature in MgO thin films”, J. Phys. Condens. Matter 22 (2010) 34. doi:10.1088/0953-8984/22/34/345004. DOI:

.K. Nomura, S. Taya, A. Okazawa, and N. Kojima, “Sol-gel synthesis and dilute magnetism of nano MgO powder doped with Fe”, Hyperfine Interact 226 (2014) 161. doi:10.1007/s10751-013-0945-z. DOI:

A. O. Mousa, N. A. Nema & S. H. Trier, “Study of structural and optical properties for MgO films prepared by using chemical spray pyrolysis technique”, Materials Science: An Indian Journal 14 (2016) 426. (2018).

J. Kang, M. Keikhaei, T. Li, and M. Ichimura, “Galvanostatic electrochemical deposition of Cu-doped Mg ( OH ) 2 thin films and fabrication of p-n homojunction”, Mater. Res. Bull. 137 (2020) 117. doi:10.1016/j.materresbull.2021.111207. DOI:

T. Shinagawa, M. Chigane, and M. Izaki, “Electrochemical Growth of Mg(OH)”, ACS omega 6 (2021) 2312. doi: 10.1021/acsomega.0c05619.

Faremi, A. A. et al. (2021) “Influence of silicon nanoparticle on the electrical properties of heterostructured CdTe/CdS thin films based photovoltaic device” Journal of the Nigerian Society of Physical Sciences 3 (2021) 261. doi: 10.46481/jnsps.2021.267. DOI:

H. Search, C. Journals, A. Contact, M. Iopscience, and I. P. Address, “Electrolytic processing of MgO coatings”, Journal of Physics: Conference Series 165 (2008) 012008. doi: 10.1088/1742-6596/165/1/012008 DOI:

M. Refai, Z. A. Hamid, and R. M. El, “Electrodeposition of Ni – ZnO nano-composite for protecting the agricultural mower steel knives”, Chem. Pap. 75 (2021) 139. doi: 10.1007/s11696-020-01291-2. DOI:

T. Shinagawa, M. Chigane, and M. Izaki, “Electrochemical Growth of Mg(OH)”, ACS omega 6 (2021) 2312. doi: 10.1021/acsomega.0c05619. DOI:

M. Keikhaei and M. Ichimura, “Fabrication of p-type Transparent ( CuZn ) O Thin Films by the Electrochemical Deposition Method”, Int. J. Electrochem. Sci. 15 (2020) 156. doi: 10.20964/2020.01.28. DOI:

L. Manjakkal, I. P. Selvam, and S. N. Potty, “Electrical and optical properties of aluminium doped zinc oxide transparent conducting oxide films prepared by dip coating technique”, 1 (2015) 8. doi: 10.1108/MI-06-2015-0058. DOI:

F. Zhou et al., “Materials Science in Semiconductor Processing Electrodeposition of gold nanoparticles on ZnO nanorods for improved performance of enzymatic glucose sensors”, Mater. Sci. Semicond. Process 105 (2019) 104708. doi: 10.1016/j.mssp.2019.104708. DOI:

M. Wang, J. Yi, S. Yang, Z. Cao, X. Huang, and Y. Li, “Applied Surface Science Electrodeposition of Mg doped ZnO thin film for the window layer of CIGS solar cell” 382 (2016) 217. DOI:

R. Saidi, F. Ashra, K. Raeissi, and M. Kharaziha, “Surface & Coatings Technology Electrochemical aspects of zinc oxide electrodeposition on Ti6Al4V alloy”, Surface and Coatings Technology 402 (2020) 126297. doi:10.1016/j.surfcoat.2020.126297. DOI:

N. J. Egwunyenga, L. N. Ezenwaka, I. A. Ezenwa, and N. L. Okoli, “Effect of annealing temperature on the optical properties of electrodeposited ZnO / MgO superlattice Effect of annealing temperature on the optical properties of electrodeposited ZnO / MgO superlattice”, Materials Research Express 6 (2019) 105921. DOI:

Tlili, Maher, Neila Jebbari, Wafa Naffouti, and Najoua Turki Kamoun. ”Effect of precursor nature on physical properties of chemically sprayed MgO thin films for optoelectronic application”, The European Physical Journal Plus 135 (2020) 1. DOI:

Moses Ezhil Raj, A., L. C. Nehru, M. Jayachandran, and C. Sanjeeviraja. ”Spray pyrolysis deposition and characterization of highly (100) oriented magnesium oxide thin films.” Crystal Research and Technology: Journal of Experimental and Industrial Crystallography 429 (2007) 867. DOI:

Islam, Shumaila, Noriah Bidin, M. Alam Saeed, Saira Riaz, M. Aizat A. Bakar, Shahzad Naseem, Khaldoon Naji Abbas, and Mohd Marsin Sanagi. ”Synthesis and characterization of room temperature sol–gel-assisted transparent tin-doped magnesium oxide nanoparticles’ protective coating.” Journal of Sol-Gel Science and Technology 81 (2017) 623. DOI:

Abdelghany, A. M., E. M. Abdelrazek, S. I. Badr, and M. A. Morsi. ”Effect of gamma-irradiation on (PEO/PVP)/Au nanocomposite: Materials for electrochemical and optical applications.” Materials & Design 97 (2016) 532. DOI:

Nemade, K. R., and dan SA Waghuley. ”Band gap engineering of CuS nanoparticles for artificial photosynthesis.” Materials Science in Semiconductor Processing 39 (2015) 781. DOI:

Mamiyev, Zamin Q., and Narmina O. Balayeva. ”Preparation and optical studies of PbS nanoparticles.”, Optical Materials 46 (2015) 522. DOI:

Jain, Navita, Neeraj Marwaha, Rajni Verma, Bipin Kumar Gupta, and Avanish Kumar Srivastava. ”Facilesynthesis of defect-induced highly-luminescent pristine MgO nanostructures for promising solid-state lighting applications.”, Rsc Advances 6 (2016) 4960. DOI:

Rastogi, Chandresh Kumar, Sulay Saha, Sri Sivakumar, Raj Ganesh S. Pala, and Jitendra Kumar. ”Kinetically stabilized aliovalent europium-doped magnesium oxide as a UV sensitized phosphor.” Physical Chemistry Chemical Physics 17 (2015) 4600. DOI:

Abdul-Manaf NA, Salim HI, Madugu MM, Olusola OI, Dhar- madasa IM “Electro-plating and characterisation of CdTe thin films using CdCl2 as the cadmium source”, Energies 8 (2015) 10883. Doi: 10.3390/en81010883 DOI:

Oluyamo, Sunday Samuel, Lawrence Olakunle Akinboyewa, Ibiyinka Agboola Fuwape, Olajide Ibukun-Olu Olusola, and Mathew Adefusika Adekoya. ”Influence of nanocellulose concentration on the tunability of energy bandgap of cadmium telluride thin films.” Cellulose 27 (2020) 8147. DOI:

Daniel, T., Mohanraj, K. and Sivakumar, G., “Effect of annealing temperature on thermally evaporated Cu3SbS3 thin films”, Journal of Materials Science: Materials in Electronics 29 (2018) 9251. doi:10.1007/s10854-018-8954-y. DOI:

Daniel, T., V. Balasubramanian, J. Henry, G. Sivakumar, and K. Mohanraj. ”Electrochemical Performance of Green Stabilizer-and Biomolecule-Assisted PbWO 4 Nanoparticles.” Journal of Electronic Materials 49 (2020) 4680. DOI:



How to Cite

Onuegbu, S. C., Oluyamo, S. S., & Olusola, O. I. (2023). Influence of Bath pH values on the Structural and Optical Properties of Electrodeposited MgO Thin Films for Optoelectronic applications. Journal of the Nigerian Society of Physical Sciences, 5(2), 931.



Original Research