Work in progress

Research

Areas 👨🏻‍💻

Projects 📂

Publications 📄

Facilities 🔬

About Research 🧪

We work invarious areas of applied electromagnetic from material, sensor to electromagnetic interference shielding.

Areas 👨🏻‍💻

Sensor

Work on using sensors at AC and microwave frequency, to detect various elements. This include work using the interdigitated electrode for the detection of various metal ions and cancer cell.

EMI shielding

Electromagnetic interference (EMI) is the unwanted EM signals that interfere with other electronic equipment and has become a challenge in the rapid growth of electronic devices operating at high frequencies. Traditional methods for electromagnetic interference (EMI) shielding have drawbacks such as weight and rigid; hence the use of conducting polymer as an alternative for EMI shielding has been explored. This includes works by intrinsically and extrinsically producing the polymer. Extrinsic conducting polymer works by adding conductive material into the polymer base.

Functional material

Exploration of possible applications for sensors and higher frequency applications. Work has included the use of chitosan as composites with various material, hybrid carbon material and high dielectric material.

Impedance Spectroscopy

The electrical response can tell us a lot about the material's properties. The material bulk resistivity, dielectric and many more can be obtained using the impedance spectroscopy technique.

Projects 📂

Study on Crosslinked Chitosan Films For Real Time Heavy Metal Detection System Incorporating Interdigitated Electrode Array

There are demands for inexpensive, disposable and portable detection methods that are still capable to yield accurate results for early detection and in-situ measurement. Methods such as electrochemical methods and spectroscopy methods have been used to detect the presence of heavy metals in aquatic solutions. All these methods are able to yield accurate results, however, it required complex measurement systems, reagent, and high capital setup. The methods are also only suitable for lab based testing.

Chitosan is known to be efficient in absorbing heavy metal ions due to the presence of a large number of amino groups in chitosan chain and will be used as a chemical sensing element for this project. The amount of heavy metal ions absorbed by the chitosan film will be determined by using interdigitated electrode (IDE). IDE is a passive electrical sensor able to measure electrical impedance. The change in the IDE resistance can be measured with the aid of the Wheatstone bridge, which then connected to microcontroller to be analysed and displayed.

Transparent and flexible chitosan polymer film embedded with metal ions filler for electromagnetic interference (EMI) shielding application.

Electromagnetic interference (EMI) is the term used for electromagnetic signal that interfere with the normal operation of other electronic equipment. This is one of the many challenges in the rapid growth of smart electronic devices operating at high frequency. Many of these devices are placed in plastic cases that provide no shielding making it susceptible to incoming/outgoing interference that can cause devices malfunction. Conventional methods of using solid or mesh metal gasket for EMI shielding is effective, however, have its drawback such as cost, high mass density, inflexible and corrosion.

A lightweight and flexible material will be useful especially in personal electronic devices and aerospace industry where weight, size and high EMI shielding is a concern. In the recent year, works on using polymer with conductive filler to replace pure metal for EMI shielding have been on the rise. This type of conductive polymer has high conduction and offers higher shielding efficiency compared to normal, non-conducting polymer. In most of the work, carbon based material has been utilized as fillers to improve the electrical conductivity of the polymer.

Publications 📄

2022

M.A.H.M.A. Majid, N.H. Osman, N. Tamchek, M.M. Ramli, N.A.A. Sukri, H.I. Mazlan, N.N. Mazu, A. Idris, K. Błoch, J. Gondro. “Chitosan/Graphene Oxide Composite Film for Adsorption of Cu2+ Ions” Acta Physica Polonica Series a, 142(1):168-171. 2022.

Abu Hassan Shaari, Helyati, Muhammad Mahyiddin Ramli, Mohd Mustafa Al Bakri Abdullah, Mohd Nazim Mohtar, Norizah Abdul Rahman, Azizan Ahmad, Nurul Huda Osman, and Febdian Rusydi. "Effects of Polymerization Time towards Conductivity and Properties of Poly(methyl methacrylate)/Polyaniline (PMMA/PANi) Copolymer" Sustainability 14, no. 14: 8940. 2022.

Ramli, Muhammad M. ; Osman, N.H. ; Darminto, D. ; Abdullah, M.M.A.B.” The Effect of Titanium Nitride Thickness as a Support Layer for Carbon Nanotubes Growth” Archives of Metallurgy and Materials, 67 (3), 963-966, 2022.

Imam Khambali, Budhi Priyanto, Retno Asih, Malik Anjelh Baqiya, Muhammad Mahyiddin Ramli, Nurul Huda Osman, Sarayut Tunmee, Hideki Nakajima, Triwikantoro, Mochamad Zainuri, Darminto. “N-Doped rGO-Like Carbon Prepared from Coconut Shell: Structure and Specific Capacitance” Journal of Renewable Materials, 2022.

2021

Nurul Huda Osman, Nurul Najiha Mazu, Josephine Ying Chyi Liew, Muhammad Mahyiddin Ramli, Andrei Victor Sandu, Marcin Nabiałek, Mohammad Abdull Halim Mohd Abdull Majid and Hazeem Ikhwan Mazlan. “Sodium-Based Chitosan Polymer Embedded with Copper Selenide (CuSe) Flexible Film for High Electromagnetic Interference (EMI) Shielding Efficiency” Magnetochemistry, 7, 102, 2021

Yunus MA, Ramli MM, Osman NH, Mohamed R. “Stimulation of Innate and Adaptive Immune Cells with Graphene Oxide and Reduced Graphene Oxide Affect Cancer Progression”. Arch Immunol Ther Exp (Warsz). 2021 Jul 29;69(1):20.

Nurul Huda Osman, Nurul Najiha Mazu, Josephine Liew Ying Chyi, Muhammad Mahyiddin Ramli, Mohammad Abdull Halim Mohd Abdull Majid and Hazeem Ikhwan Mazlan. “Chitosan-Bentonite crosslinked film as indicator for copper (II) ions adsorption” Eur. Phys. J. Appl. Phys. Volume 95, Number 1, 2021.

Muhammad M. Ramli, A. S. Rosman, N. S. Mazlan, M. F. Ahmad, D. S. C. Halin, R. Mohamed, Nurul H. Osman, Ali H. Reshak, “Cell viability and electrical response of breast cancer cell treated in aqueous graphene oxide solution deposition on interdigitated electrode”. Scientific Report 11, 20702 (2021)

Older

N. N. Mazu, M. A. H. M. A. Majid, N. H. Osman, J. Y. C. Liew and M. M. Ramli, "Shielding Efficiency Study of Sodium Based Chitosan Polymer with Different Types of Filler," 2020 IEEE International RF and Microwave Conference (RFM), 2020, pp. 1-4, doi: 10.1109/RFM50841.2020.9344779.

N. Osman, A. Idris, P.A. Bakar, M.A.H.M.A. Majid, C. Free. “Tunable Rectangular Ring Resonator Filter with Embedded Shunt Barium Strontium Titanate Capacitors” IEEE International RF and Microwave Conference, IEEE Proceedings, pp. 363-366, 2019.

N.Osman, A. Idris , P. Abu Bakar, M.A. Mohd Abdull Majid, R. Radzali and J.Y.C. Liew. “Detection Of Copper (II) Ion On Chitosan Film Using Microstrip Ring Resonator”, International Journal of Nanoelectronics and Materials, International Journal of Nanoelectronics and Materials Volume 11 (Special Issue) , pp. 179-186, 2019.

Adilah Idris, Nurul Huda Osman , “Adsorption Of Cu (Ii) Ion In Aqueous Solution Using Crosslinked Chitosan Bentonite Composite Beads And Film” Solid State Science And Technology, Vol. 26, pp 97-105, 2018.

Kassim, A.N.M., Mohtar, M.N., Osman, N.H., Shafie, S. “Sensor Fabrications using Inkjet Distributions and Analysis Systems” IEEE 5th International Conference on Smart Instrumentation, Measurement and Application, IEEE Proceedings, 2018. 25. N. Osman, and R. Radzali."Detection of Mercury Ion (Hg2+) on Chitosan Film using Microstrip Interdigital Capacitor." 2017 IEEE proceeding Asia Pacific Microwave Conference (APMC), pp. 573-575, 2017.

Facilities 🔬

Vector Network Analyzer

LCR Meter

Spectrum Analyzer

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