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Dr. Femi Emmanuel Olu

Dr. Femi Emmanuel Olu is a Professor of Material Science and Engineerig at the Jimma Institute of Technology, Jimma University in Ethiopia. He received his PhD in Materials Engineering from the Indian Institute of Science and his MSc in Materials Science from the African University of Science and Technology. Dr. Femi has considerable research expertise in energy materials, electrochemical methods for sensor applications, and thermoelectric materials and has received various accolades and grants, including three visiting faculty posts at the Indian Institute of Science. He has taught a wide range of undergraduate and postgraduate courses and served in several administrative posts at Jimma University, including dean of the Faculty of Materials Science and Engineering. Throughout his career, Dr. Femi has successfully supervised and mentored a large number of doctoral and master's students.


Honours and Awards

Research Areas

Here are some of our research interests, along with brief descriptions:

Processing Techniques

Here are some of the key processing techniques used in our research group:

Rapid Solidification

This process modifies the microstructure of materials during production to enhance their mechanical properties. Rapid cooling of molten metal is required for this process. Small, uniform grain structures can be formed at this rapid cooling rate (up to a million degrees Celsius per second), leading to increased hardness and strength compared to slower cooling methods. Our group have used this approach to improve the mechanical and thermoelectric properties of thermoelectric materials


When applied to materials, ultrasonic waves can cause a wide range of physical and chemical changes, a process known as ultrasonication. Ultrasonication processing has many applications in materials processing. We have extensively used this approach in the synthesis of 2D, atomically thin materials for various functional applications.

Hydrothermal Synthesis

In this method, substances are crystallized from aqueous solutions at elevated temperatures and vapor pressures. Crystalline nanoparticles and thin films are common products of this process. Hydrothermal synthesis is advantageous because it does not necessitate the use of organic solvents, it can be carried out at low temperatures, and it can produce pure, crystallized products. We have employed this method in producing different nanoparticles for oxygen and hydrogen evolution reactions

Solvothermal Synthesis

This technique is similar to the hydrothermal route, except that the synthesis takes place in an airtight container (an autoclave) and the water is replaced by a solvent. The reagents react under carefully managed conditions of temperature and pressure to yield the desired compound. The versatility of this technique has led to its widespread adoption for the synthesis of a wide range of inorganic compounds, composites, and hybrid materials

News and Events

  • Visit of Top Jimma University Management to the Institute of Science Bangalore, India


Title Authors Journal Year Link
Integrated First Principles and Experimental Investigation of Thermoelectric Transport in Zr/Ti Half-Heusler-Type High Entropy Alloys Chalchisa GA, Ashutosh S, Surafel SL, Dipanjan K, Yoshihito K, Ayansa TS, Sreeram PR, Femi OE, Chandra ST, Abhishek KS, Kamanio C Energy Technol. 2024 Link
Microstructure and thermoelectric properties of as-cast Ag2Te/AgBiTe2 and Ag2Te/Bi2Te3 two-phase alloys Ayansa TS, Varinder P, SL, Shriparna M, Swagat D, Bhupendra K, Chalchisa GA, Sreeram PR, Manas P, Femi OE , Chandra STiwary, Kamanio C J.Phys.Chem.Sol. 2024 Link
MnOx-Coffea arabica Husk and Catha edulis Leftover Biochar Nanocomposites for Removal of Methylene Blue from Wastewater Jemere Kochito, Abera Gure, Negera Abdissa, Tamene Tadesse Beyene, Olu Emmanuel Femi Sci.World J. 2024 Link
Magnetic biochar nanocomposites of coffee husk and khat (Catha edulis) leftover for removal of Cr (VI) from wastewater Jemere Kochito, Abera Gure, Negera Abdissa, Tamene Tadesse Beyene, Olu Emmanuel Femi Curr. Res. Green Sustain. Chem. 2024 Link
The beneficial effect of Fe addition in PbTe-Ni diffusion bonded thermoelectric contact interfaces–A comprehensive phase evolution study Dipanjan K, Chaltu AM, Olu EF, N Ravishankar, K Chattopadhyay Acta Mater 2023 Link
Thermoelectric Transport of a Novel Zr-Based Half-Heusler High-Entropy Alloy Chalchisa GA, Ashutosh S, Surafel SL, Yoshihito K, Ayansa TS, Sreeram PR, Femi EO, Chandra ST, Abhishek KS, Kamanio C Energy Technol. 2023 Link
Transport properties and microstructural evolution of Bi-Cu-Te ternary alloys Ayansa TS, Varinder Pal, P. R. Sreeram, Surafel SL, Bhupendra K, Chalchisa GA, Mukherjee S, Manas P, Olu EF, Tiwary CS & Chattopadhyay K J. Mater. Sci. 2023 Link
Facile preparation of magnetite cellulose nanocomposite from a sustainable resource Kebede GS, Surafel SL, Alberto VR, Abubeker YA, Olu EF Bull. Mater. Sci 2023 Link
Optimization of Cd (II) removal from aqueous solution by natural hydroxyapatite/bentonite composite using response surface methodology Desalegn, Y.M., Bekele, E.A. & Olu, F.E. Sci Rep 2023 Link
Effects of doping iron on the colouring properties of copper chromate pigment Eticha, Z.G., Alex, T.C., Olu, F.E. et al Bull Mater Sci 2023 Link
Synergetic Effect of Three-in-One Nanocomposite Based on AuNPs and rGO-MWCNTs for Ultrasensitive Electrochemical Bio-Diagnostic Applications Zewdu. M, Sandhu. T., Kaur. N.,Abebe. M, Olu. F., Sabherwal. P. J. Electrochem. Soc. 2023 Link
Self-healing Coal fly ash Construction Brick for CO2 and Dust Adsorption Fayza SK, Kalid AS, Olu EF, Mengistu JD, Rout A J. Mater. Eng. Struct 2023 Link
Influence of Cold Rolling and Thermal Treatment on Microstructure and Texture Evolution, and Tensile Behaviour of High Strength Al-Co-Sc-Zr Alloys. Perugu, CS, Cheksa, EM, Mohan, MS, and Olu EF, Padaikathan P. J Alloys Compd 2022 Link
Zr-Based Quaternary Half-Heusler Alloy Systems ZrNimX0.5Sb1.5-m (X=Fe/In): Studies on Phase Evolution, Crystal Structures and Electronic Properties. Kumar D, Legese, SS, Mukherjee S, Olu EF. N Ravishankar, K Chattopadhyay J Alloys Compd 2022 Link
Two-dimensional Cobalt Telluride as Piezo-tribogenerator Demiss S, Tromer R, Gowda CC, Olu EF, Roy AJ, Pandey P, Galvao D S, Ajayan PM, Kumbhakar P, Tiwary CS. Nanoscale 2022 Link
Multifold enhancement in magnetization of atomically thin Cobalt Telluride Demiss S, Tromer R, Siddique S, Woellner CF, Olu EF., Palit M, Roy AJ, Pandey P, Galvao D S, Kumbhakar P, Tiwary C.S. Appl. Phys. A. 2022 Link
A Review of Lamellar Eutectic Morphologies for Enhancing Thermoelectric and Mechanical Performance of Thermoelectric Materials Legesse SS, Olu EF. J Indian Inst Sci. 2022 Link
An innovative catalyst of PdNiP nanosphere deposited PEDOT: P.S.S./rGO hybrid material as an efficient electrocatalyst for alkaline urea oxidation Lera IL, Khasnabis S, Wangatia LM, Olu EF, Ramamurthy PC. Polym. Bull. 2022 Link
Effect of Annealing Temperature of Brownish-Red Pigment Based on Iron Oxide Extracted by Hydrothermal Route from Mill-Scale Steel Slag Eticha ZG, Rojas-Hernandez RE, Olu EF, Yimam A, Hussainova I, Alemayehu E. J Sust Metal 2022 Link
Insights into electrochemical behavior and kinetics of NiP on PEDOT: P.S.S./reduced graphene oxide as high-performance electrodes for alkaline urea oxidation Lera IL, Khasnabis S, Wangatia LM, Olu EF, Ramamurthy PC. J Solid State Electrochem 2022 Link
Insights into the Electrochemical Behavior and Kinetics of NiP@PANI/rGO as a High-Performance Electrode for Alkaline Urea Oxidation Lera, I.L., Khasnabis, S., Wangatia, L.M. Olu, E.F, Ramamurthy. P.C Electrocatalysis 2022 Link
Understanding the mechanics of complex topology of the 3D printed Anthill architecture Brijesh K., Avinash K., Rushikesh S. A., Vinay A., Solomon D. N., Deep B., Femi E. O., Ravi S. A., Varinder P., Kishor K. S., Nicola M. P., Chirodeep B., Chandra S. T. Oxf. open mater. sci. 2022 Link
Energy Harvesting from Atomically Thin Co2Te3 Solomon D. N., Alexey K., Mithun P., Prafull P., Femi E. O., Ajit K. R., Gour P. D., Pulickel M. A., Partha K., Chandra S. T. J. Phys. Chem. C 2022 Link
Emerging two-dimensional tellurides Siddique S, Gowda CC, Demiss S, Tromer R, Paul S, Sadasivuni KK, Olu EF, Chandra A, Kochat V, Galvao DS, Ajayan PM, Kumbhakar P, Tiwary CS Mater Today 2021 Link
Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu2Te-Sb2Te3 Eutectic Mukherjee S, Aramanda SK, Legese SS, Riss A, Rogl G, Olu EF, Bauer E, Rogl PF, K Chattopadhyay ACS Appl Ener Mat 2021 Link
Thermophysical and magnetic properties of Co-Ni-Mo-Al-Ta class of tungsten free Co-based superalloys Singh MP, Olu EF, Pandey P, Chattopadhyay K. J Alloys Compd 2021 Link
Polypyrrole@polyaniline-reduced graphene oxide nanocomposite support material and Cobalt for the enhanced electrocatalytic activity of nickel phosphide microsphere towards alkaline urea oxidation Lera IL, Khasnabis S, Wangatia LM, Olu EF, Ramamurthy PC. Mater Res Express 2021 Link
Synthesis and characterizations of (Mg, Co, Ni, Cu, Zn)O high-entropy oxides Desissa TD, Meja M, Andoshe D, Olu EF, Gochole F, Bekele G, Zelekew OA, Temesgen T, Brehane B, Kuffi KD, Hunde T, S.N. Appl Sci 2021 Link
Scalable Synthesis of Atomically Thin Gallium Telluride Nanosheets for Supercapacitor Applications Siddique S, Gowda CC, Tromer R, Demiss S, Gautam A.R.S., Olu EF, Kumbhakar P, Galvao DS, Chandra A, Tiwary C.S. Appl Nano Mat 2021 Link
Synthesis, characterization and electrocatalytic study of Pd supported on CeO2–N, S-rGO composite towards hydrogen and oxygen evolution reaction Woldetinsay M, Soreta TR, Palani K, Maiyalagan T, Olu EF J Mater Sci Mater Electron 2021 Link
Thermoelectric properties of BiSbTe-type alloys prepared by chill-casting and cryo-milling Olu EF, Elangovan H, Mukherjee S, Tripathi S, Chattopadhyay K Mater Chem Phys 2021 Link
Effect of support material on the electrocatalytic activity of palladium Nanoparticle toward hydrogen evolution reaction Woldetinsay M, Soreta TR, Maiyalagan T, Olu EF Mater Res Express 2021 Link
Production of magnetite nanoparticles from Ethiopian iron ore using solvent extraction and studying parameters that affect crystallite size Sebehanie KG, Del Rosario AV, Ali AY, Olu EF Mater Res Express 2020 Link
Fabrication of large-scale p-type 75%Sb2Te3-25%Bi2Te3 thermoelectric materials by gas atomization and hot isostatic pressing Yoon SM, Madavali B, Lee C, Olu EF, Lee J, Song SH, Hong SJ Mater Res Bull 2020 Link
Synergetic effect between MoS2 and N, S- doped reduced graphene oxide supported palladium nanoparticles for hydrogen evolution reaction Woldetinsay M, Refera T, Olu EF, Maiyalagan T. Mater Chem Phys 2020 Link
Electrocatalytic Investigation of M@Pd (M=Ni, Co, Cu) Core-Shell Nanostructure Supported on N, S-Doped Reduced Graphene Oxide towards Hydrogen and Oxygen Evolution Reaction Woldetinsay M, Olu EF, Soreta TR, Maiyalagan T. ChemistrySelect 2020 Link
Molecularly imprinted polyaniline molecular receptor-based chemical sensor for the electrochemical determination of melamine Regasa MB, Soreta TR, Olu EF, Ramamurthy PC, Kumar S. J Mol Recogn 2020 Link
Development of Melamine Electrochemical Sensor Using Molecularly Imprinted Conducting Polyanilne-Oxalic Acid Blend as a Molecular Recognition Element Regasa MB, Olu EF, Soreta TR, Ramamurthy PC, Kumaran S. Nano Hybrids and Composites 2020 Link
Mechanical and Thermoelectric Properties of Eutectic Composite (Bi,Sb)2Te3/Te Thermoelectric Material Olu EF, Hong S, Chattopadhyay K. Trans Indian Inst Met 2020 Link
Development of Molecularly Imprinted Conducting Polymer Composite Film-Based Electrochemical Sensor for Melamine Detection in Infant Formula Regasa MB, Refera Soreta T, Olu EF, Ramamurthy PC ACS Omega 2020 Link
Bioinspired Aluminum Composite Reinforced with Soft Polymers with Enhanced Strength and Plasticity Rout A, Gumaste A, Pandey P, Oliveira EF, Demiss S, Mahesh VP, Bhatt C, Raphael K, Ayyagari RS, Autreto P.A.S., Palit M, Olu EF, Galvao DS, Arora A, Tiwary C.S. Adv Eng Mater 2020 Link
Novel multifunctional molecular recognition elements based on molecularly imprinted poly (aniline-co-itaconic acid) composite thin film for melamine electrochemical detection Regasa MB, Soreta TR, Olu EF, Ramamurthy PC, Subbiahraj S Sens Bio-Sens Res 2020 Link
Microstructure, and thermoelectric properties of Cu2Te-Sb2Te3 pseudo-binary system Mukherjee S, Olu EF, Chetty R, Chattopadhyay K, Suwas S, Mallik R.C. Sci Rep 2018 Link
Effects of Ni and carbon-coated Ni addition on the thermoelectric properties of 25Bi2Te3+75Sb2Te3 base composites Yoon SM, Dharmaiah P, Olu EF, Lee CH, Hong SJ Mater Chem Phys 2017 Link
Improved Mechanical Properties of Al-Si Alloys by Adding an Extrusion Process to Conventional Processing Method Han JY, Olu EF, Kilicaslan F, Jeong CU, Baeg CH, Hong SJ Arch Metall Mater 2017 Link
Thermoelectric Properties of Bi Doped Tetrahedrite Prem Kumar DS, Chetty R, Olu EF, Chattopadhyay K, Malar P, Mallik R.C J Electron Mater 2017 Link
Effect of processing route on the bipolar contribution to the thermoelectric properties of n-type eutectic Bi22.5Sb7.5Te70 alloy Olu EF, Akkiraju K, Murthy BS, Ravishankar N, Chattopadhyay K. J Alloys Compd 2016 Link
Microstructure evolution and thermoelectric properties of Te-poor and Te-rich (Bi,Sb)2Te3 prepared via solidification Olu EF, Ravishankar N, Chattopadhyay K J Mater Sc 2016 Link
Thermoelectric Properties of In-Doped Cu2ZnGeSe4 Chetty R, Bali A, Olu EF, Chattopadhyay K, Mallik R.C J Electron Mater 2016 Link
Silicene and transition metal-based materials: Prediction of a two-dimensional piezomagnet Dzade NY, Obodo KO, Adjokatse SK, Ashu AC, Amankwah E, Atiso CD, Olu EF, Udeigwe JO, Waghmare UV J Phys Condens Matter 2010 Link

Undergraduate Student Section

If you are an undergraduate student, you are invited to test your knowledge of Solid State Physics for Material Science. As part of this course, I am currently offering tutorials for 5th year undergraduates who will be taking the National Exam in July. Whether you're looking to brush up on your understanding of Solid State Physics or want to challenge yourself with more advanced topics, these practice questions are a great way to test your skills and deepen your understanding:

Disclaimer: The questions presented here are intended solely for practice purposes, and are designed to help you increase your understanding of the fundamentals of Solid State Physics for Material Science. Please note that there is no guarantee that the same or similar questions will appear on the National Examination:

Note:If you have any questions or require further clarification on any of the practice questions, please don't hesitate to get in touch with me.

Note: At the end of the practice questions, please refresh the page to start over again:

Computer-Based Examination

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