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Dr Libu Manjakkal's Outputs (88)

RF-sputtered Al-doped ZnO-based transparent electrochemical capacitors developed as a structural energy storage to replace double-glazed window for a smart building (2025)
Journal Article
Paul, F., Narayanan, V. K., Gopidas, S. S., Markapudi, P. R., See, C. H., Jose, G., Potty, S. N., & Manjakkal, L. (2025). RF-sputtered Al-doped ZnO-based transparent electrochemical capacitors developed as a structural energy storage to replace double-glazed window for a smart building. Applied Physics Letters, 126(13), Article 133901. https://doi.org/10.1063/5.0255229

Structural energy storage combines energy storage with structural strength, reducing weight, saving space, and improving efficiency. Among various types, transparent structural energy storage shows strong potential for seamless integration into windo... Read More about RF-sputtered Al-doped ZnO-based transparent electrochemical capacitors developed as a structural energy storage to replace double-glazed window for a smart building.

Flexible Electrochemical Capacitors based on ZnO-Carbon Black Composite (2025)
Journal Article
Habib, W., Saji, A., Paul, F., Markapudi, P. R., Wilson, C., & Manjakkal, L. (2025). Flexible Electrochemical Capacitors based on ZnO-Carbon Black Composite. Results in Engineering, 25, Article 104510. https://doi.org/10.1016/j.rineng.2025.104510

Flexible electrochemical capacitors (EC) or supercapacitors are found to be an efficient energy storage device for modern and future electronic gadgets that offer lightweight and compact energy solutions. In this work, we investigated the electrochem... Read More about Flexible Electrochemical Capacitors based on ZnO-Carbon Black Composite.

A PIFA Array with Enhanced Bandwidth and Isolation for 5G Smartphone Applications (2025)
Presentation / Conference Contribution
Basherlou, H. J., Odiamenhi, M., Ojaroudi Parchin, N., Manjakkal, L., & See, C. H. (2025, March). A PIFA Array with Enhanced Bandwidth and Isolation for 5G Smartphone Applications. Presented at URSI UK Symposium 2025, Durham University

This research presents a new antenna array system with enhanced impedance bandwidth and reduced mutual coupling designed for sub-6 GHz smartphone applications. The antenna resonators are functioning within the frequency spectrum spanning from 3.3 to... Read More about A PIFA Array with Enhanced Bandwidth and Isolation for 5G Smartphone Applications.

2D metal-organic framework Cu3(HHTP)2 composite electrode for flexible energy storage applications (2025)
Journal Article
Prince, M., Kanathedath, J., Paul, F., Markapudi, P. R., Beg, M., Paterson, L., Desmulliez, M. P., Pillai, S. C., & Manjakkal, L. (2025). 2D metal-organic framework Cu3(HHTP)2 composite electrode for flexible energy storage applications. Journal of Power Sources, 631, Article 236214. https://doi.org/10.1016/j.jpowsour.2025.236214

Hydrothermally synthesized 2D metal-organic framework (MOF) Cu3(HHTP)2 was modified with carbon black (CB) and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS) to develop a flexible energy storage device. The efficiency of electro... Read More about 2D metal-organic framework Cu3(HHTP)2 composite electrode for flexible energy storage applications.

Spindle‐Shaped Ni‐Fe‐Layered Double Hydroxide: Effect of Etching Time on Flexible Energy Storage (2025)
Journal Article
Nair, K. M., Ajith, S., Paul, F., Pallilavalappil, S., Thomas, N., Hinder, S. J., Manjakkal, L., & Pillai, S. C. (2025). Spindle‐Shaped Ni‐Fe‐Layered Double Hydroxide: Effect of Etching Time on Flexible Energy Storage. Small, 21(7), Article 2409959. https://doi.org/10.1002/smll.202409959

The rising demand for efficient energy storage in flexible electronics is driving the search for materials that are well‐suited for the fabrication of these devices. Layered Double Hydroxides (LDHs) stand out as a remarkable material with a layered s... Read More about Spindle‐Shaped Ni‐Fe‐Layered Double Hydroxide: Effect of Etching Time on Flexible Energy Storage.

Electrochemical energy storing performances of printed LaFeO3 coated with PEDOT: PSS for hybrid supercapacitors (2024)
Journal Article
Nair, R., Uppuluri, K., Paul, F., Sirengo, K., Szwagierczak, D., Pillai, S. C., & Manjakkal, L. (2025). Electrochemical energy storing performances of printed LaFeO3 coated with PEDOT: PSS for hybrid supercapacitors. Chemical Engineering Journal, 504, 158781. https://doi.org/10.1016/j.cej.2024.158781

eveloping advanced smart energy storage devices demanded new functional materials to store energy effectively and deliver power quickly. In this work, we studied the energy-storing performance of perovskite material, lanthanum ferrite (LaFeO3), prepa... Read More about Electrochemical energy storing performances of printed LaFeO3 coated with PEDOT: PSS for hybrid supercapacitors.

Biodegradable biopolymers for electrochemical energy storage devices in a circular economy (2024)
Journal Article
Beg, M., Saju, J., Alcock, K. M., Mavelil, A. T., Markapudi, P. R., Yu, H., & Manjakkal, L. (2025). Biodegradable biopolymers for electrochemical energy storage devices in a circular economy. RSC Sustainability, 3(1), 37-63. https://doi.org/10.1039/d4su00468j

The rising trend of green energy has made it necessary to utilise efficient green materials in electrochemical energy storage devices (EESDs) under a green economy. The need for sustainable energy storage technologies due to the rising demand for ene... Read More about Biodegradable biopolymers for electrochemical energy storage devices in a circular economy.

Optimizing Carbon Structures in Laser-Induced Graphene Electrodes Using Design of Experiments for Enhanced Electrochemical Sensing Characteristics (2024)
Journal Article
Fantinelli Franco, F., Malik, M. H., Manjakkal, L., Roshanghias, A., Smith, C. J., & Gauchotte-Lindsay, C. (2024). Optimizing Carbon Structures in Laser-Induced Graphene Electrodes Using Design of Experiments for Enhanced Electrochemical Sensing Characteristics. ACS applied materials & interfaces, 16(47), 65489 - 65502. https://doi.org/10.1021/acsami.4c13124

In this study, we explored the morphological and electrochemical properties of carbon-based electrodes derived from laser-induced graphene (LIG) and compared them to commercially available graphene-sheet screen-printed electrodes (GS-SPEs). By optimi... Read More about Optimizing Carbon Structures in Laser-Induced Graphene Electrodes Using Design of Experiments for Enhanced Electrochemical Sensing Characteristics.

Enhancing Supercapacitor Electrochemical Performance with 3D Printed Cellular PEEK/MWCNT Electrodes Coated with PEDOT: PSS (2024)
Journal Article
Chandran, A. C. S., Schneider, J., Nair, R., Buchanan, B., Gadegaard, N., Hogg, R., Kumar, S., & Manjakkal, L. (in press). Enhancing Supercapacitor Electrochemical Performance with 3D Printed Cellular PEEK/MWCNT Electrodes Coated with PEDOT: PSS. ACS Omega, 9(31), 33998-34007. https://doi.org/10.1021/acsomega.4c04576

In this study, we examine the electrochemical performance of supercapacitor (SC) electrodes made from 3D-printed nanocomposites. These composites consist of multiwalled carbon nanotubes (MWCNTs) and polyether ether ketone (PEEK), coated with poly­(3,... Read More about Enhancing Supercapacitor Electrochemical Performance with 3D Printed Cellular PEEK/MWCNT Electrodes Coated with PEDOT: PSS.

MIMO Smartphone Antenna with CPW-Fed Stepped Resonators for sub 6 GHz Cellular Networks (2024)
Presentation / Conference Contribution
Basherlou, H. J., Ojaroudi Parchin, N., Manjakkal, L., See, C. H., Amar, A. S. I., Salama, A. G., & Darwish, M. (2024, May). MIMO Smartphone Antenna with CPW-Fed Stepped Resonators for sub 6 GHz Cellular Networks. Presented at 14th International Conference on Electrical Engineering (ICEENG), Cairo , Egypt

The imperative for cutting-edge multi-port MIMO antennas has surged, driven by the evolving demands of advanced technologies, notably in the context of 5G networks and beyond. This paper introduces a new MIMO antenna utilizing Coplanar Waveguide (CPW... Read More about MIMO Smartphone Antenna with CPW-Fed Stepped Resonators for sub 6 GHz Cellular Networks.

Gain-Enhanced/End-Fire Phased Array Antenna for Future Cellular Networks (2024)
Presentation / Conference Contribution
Basherlou, H. J., Ojaroudi Parchin, N., Manjakkal, L., See, C. H., Amar, A. S. I., & Salama, A. G. (2024, May). Gain-Enhanced/End-Fire Phased Array Antenna for Future Cellular Networks. Presented at 14th International Conference on Electrical Engineering (ICEENG), Cairo, Egypt

This research paper delves into a new beam-steerable phased array design, showing remarkable radiation capabilities tailored to the demands of upcoming cellular networks like 5G/6G. The study focuses on smartphone applications, recognizing their comp... Read More about Gain-Enhanced/End-Fire Phased Array Antenna for Future Cellular Networks.

Smart-Textile-Based Electrochemical Capacitive Ionic Sensors for High-Performance Epidermal Electronics (2024)
Journal Article
Mavelil, A. T., Sam, V., Markapudi, P. R., Paul, F., Beg, M., & Manjakkal, L. (2024). Smart-Textile-Based Electrochemical Capacitive Ionic Sensors for High-Performance Epidermal Electronics. IEEE Sensors Letters, 8(7), Article 2000704. https://doi.org/10.1109/lsens.2024.3411780

Recently, biomedical engineering has placed greater importance on wearable and disposable health-care monitoring devices. Various degradable biosensors have been developed to measure human parameters, such as temperature, pH, pressure, strain, and io... Read More about Smart-Textile-Based Electrochemical Capacitive Ionic Sensors for High-Performance Epidermal Electronics.

Opto-electrochemical variation with gel polymer electrolytes in transparent electrochemical capacitors for ionotronics (2024)
Journal Article
Kumar, C., Sebastian, A. K., Markapudi, P. R., Beg, M., Sundaram, S., Hussain, A., & Manjakkal, L. (2024). Opto-electrochemical variation with gel polymer electrolytes in transparent electrochemical capacitors for ionotronics. Applied Physics Letters, 124(11), Article 111603. https://doi.org/10.1063/5.0190801

Advanced flexible ionotronic devices have found excellent applications in the next generation of electronic skin (e-skin) development for smart wearables, robotics, and prosthesis. In this work, we developed transparent ionotronic-based flexible elec... Read More about Opto-electrochemical variation with gel polymer electrolytes in transparent electrochemical capacitors for ionotronics.

Screen Printed RuO2 Films for Energy Storage and Electrochemical Sensors (2024)
Presentation / Conference Contribution
Paul, F., Sam, V., Uppuluri, K., Beg, M., & Manjakkal, L. (2024, February). Screen Printed RuO2 Films for Energy Storage and Electrochemical Sensors. Poster presented at The 10th annual Innovations in Large-Area Electronics Conference (innoLAE 2024), Cambridge

Electrochemical Capacitors based on Organic Semiconductors and Metal Oxides (2024)
Presentation / Conference Contribution
Kanathedath, J., Nair, R., Peringath, A. R., Sasikumar, A., Paul, F., Beg, M., & Manjakkal, L. (2024, February). Electrochemical Capacitors based on Organic Semiconductors and Metal Oxides. Poster presented at The 10th annual Innovations in Large-Area Electronics Conference (innoLAE 2024), Cambridge

Multifunctional flexible and stretchable electrochromic energy storage devices (2024)
Journal Article
Manjakkal, L., Pereira, L., Kumi Barimah, E., Grey, P., Franco, F. F., Lin, Z., Jose, G., & Hogg, R. A. (2024). Multifunctional flexible and stretchable electrochromic energy storage devices. Progress in Materials Science, 142, Article 101244. https://doi.org/10.1016/j.pmatsci.2024.101244

Electrochromic energy storage devices (EESDs) including electrochromic supercapacitors (ESC) and electrochromic batteries (ECB) have received significant recent attention in wearables, smart windows, and colour-changing sunglasses due to their multi-... Read More about Multifunctional flexible and stretchable electrochromic energy storage devices.

Paper Supercapacitor Developed Using a Manganese Dioxide/Carbon Black Composite and a Water Hyacinth Cellulose Nanofiber-Based Bilayer Separator (2023)
Journal Article
Beg, M., Alcock, K. M., Titus Mavelil, A., O’Rourke, D., Sun, D., Goh, K., Manjakkal, L., & Yu, H. (2023). Paper Supercapacitor Developed Using a Manganese Dioxide/Carbon Black Composite and a Water Hyacinth Cellulose Nanofiber-Based Bilayer Separator. ACS applied materials & interfaces, 15(44), 51100-51109. https://doi.org/10.1021/acsami.3c11005

Flexible and green energy storage devices have a wide range of applications in prospective electronics and connected devices. In this study, a new eco-friendly bilayer separator and primary and secondary paper supercapacitors based on manganese dioxi... Read More about Paper Supercapacitor Developed Using a Manganese Dioxide/Carbon Black Composite and a Water Hyacinth Cellulose Nanofiber-Based Bilayer Separator.