Department Of Materials And Electrical Engineering

List of Members of the Department of Materials and Electrical Engineering

MAIN ACHIEVEMENTS

1. Development of 3D printing materials and technology

1.1. Design and Fabrication of 3D printing equipment

The Department has successfully developed a multifunctional 3D printer equipped with dual print heads, enabling both fused deposition modelling (FDM) and direct ink writing (DIW). This system allows the integration of diverse materials for prototyping complex, eco-friendly designs. The printer incorporates modular hardware, discrete components, and customized control software based on open-source platforms.

1.2. Fabrication of Supercapacitor Electrodes Using 3D Printing

A nanocomposite electrode material based on manganese cobalt sulfide/reduced graphene oxide (MCS/rGO) was synthesized and processed into printable ink. Electrodes produced via 3D printing demonstrated a high specific capacitance of 3812.5 F/g at 2 A/g and retained over 92% of capacitance after 22,000 cycles at 50 A/g. These results were published in RSC Advances (2022). Additionally, the team was granted Patent No. 42193 (Nov. 28, 2024) for a fabrication method of hybrid supercapacitors using Zn and Mn–Co–S/conducting polymer porous electrodes.

Figure 1. (a) Synthesis process of MCS/rGO electrode, (b) Patent No. 42193

1.3. Development of Triboelectric Nanogenerators (TENGs)

Using a composite polymer membrane (PHMG–GA–PVA), the team fabricated high-performance TENG electrodes by 3D printing. The devices achieved peak-to-peak voltages of 664.5 V and currents of 116.8 µA at 1 Hz, while maintaining ~98% stability after 360,000 cycles. The electrodes also exhibited antibacterial properties against both Gram-positive and Gram-negative strains, showing promise for self-powered antibacterial masks and smart wearables. Results were published in RSC Advances (2025).

2. Hybrid magnetic-optical nanomaterials

Hollow Fe3O4@Au hybrid nanoparticles (h-NPs) for applications in enhancing magnetic/optical heating effects and T1-T2 magnetic resonance imaging have been successfully studied. The h-NPs material simultaneously demonstrates the ability to improve positive contrast while maintaining negative contrast. Exploring the dual contrast ability (shortening both T1 and T2) of the h-NPs material opens up the potential for practical applications in MRI imaging diagnosis, and possibly CT imaging. This process includes the steps of: (a) creating Fe3O4@Ag hybrid nanoparticles, and (b) creating hollow Fe3O4@Au hybrid nanoparticles from the above Fe3O4@Ag hybrid nanoparticles. The work has been granted Patent No. 37620 (Oct. 19, 2023). The research results are published in New Journal of Chemistry, 47 (8) (2023), 4052-4067.

3. Advanced grounding materials for electrical systems

The Department developed an advanced graphene-enhanced conductive cement (GEM powder) that combines high conductivity, mechanical robustness, adhesion to metal electrodes, and corrosion resistance (IEC 62661-7-2018 compliant). This technology was protected by Utility Patent No. 3661 (Aug. 7, 2024).

TYPICAL PUBLICATIONS

1. Doan T. Tung, Le T. T. Tam, Nguyen T. T. Duong, Hoang T. Dung, Ngo T. Dung, Nguyen A. Duc, Phan N. Hong, Nguyen T. Dung, Phan N. Minh and Le T. Lu , A novel polymer composite from polyhexamethylene guanidine hydrochloride for high performance triboelectric nanogenerators (TENGs), RSC Advances, 15 (2) (2025), 844-850.

2. Le T. T. Tam, Nguyen T. N. Linh, Le T. Tam, Duong V. Thiet, Pham H. Nam, Nguyen T. H. Hoa, Le A. Tuan, Ngo T. Dung and Le T. Lu, Biocompatible PMAO-coated Gd2O3/Fe3O4 composite nanoparticles as an effective T1–T2 dual-mode contrast agent for magnetic resonance imaging, Materials Advances, 6 (4) (2025), 1319-1329.

3. Nguyen TN Linh, Ngo T Dung, Le TT Tam, Le T Tam, Nguyen P Hung, Nguyen D Vinh, Ngo T Ha, Pham H Nam, Le V Thanh, Nguyen V Dong, Le G Nam, Nguyen V Dang, Nguyen X Phuc, Le D Tung, Nguyen TK Thanh, Le T Lu, Synthesis and properties of hollow Fe3O4@ Au hybrid nano-structures for T 1–T 2 MR imaging and a combination of magnetic and photo-induced heating, New Journal of Chemistry, 47 (8) (2023), 4052-4067.

4. Duong V. Thiet, Doan T. Tung, Le T.T. Tam, Ngo T. Dung, Le T. Tam, Pham T. Nam, Nguyen T.T. Trang, Dimitra Vernardou, Top K. Le, Nguyen V. Tam, Tran D. Lam, Le T. Lu, Reverse voltage pulse deposition of a porous polyaniline/Mn–Co sulfide composite cathode material for modified Zn-ion hybrid supercapacitors, New Journal of Chemistry, 47 (31) (2023), 14885-14893.

5. Le T. T. Tam. Doan T. Tung, Ha M. Nguyet, Nguyen T. N Linh, Ngo T. Dung, Nguyen V. Quynh, Nguyen V. Dang, Dimitra Vernardou, Le K. Top, Le A. Tuan, Phan N. Minh and Le T. Lu, High electrochemical performance of ink solution based on manganese cobalt sulfide/reduced graphene oxide nano-composites for supercapacitor electrode materials, RSC Advances, 12 (2022), 20182-20190.

6. Doan T. Tung, Le T. T. Tam, Hoang T. Dung, Ngo T. Dung, Phan N. Hong, Ha M. Nguyet, Nguyen V. Quynh, Nguyen V. Chuc, Vu Q. Trung, Le T. Lu and Phan N. Minh, Fabrication of rGO-CuCo2S4 nanocomposite material for supercapacitor electrode, Electrochimica Acta, 392 (2021), 138992.

7. Ngo T. Dung, Le T. T. Tam, Dinh L. Chi, Nguyen T. H. Hoa, Nguyen P. Hung, Ngo T. Ha, Pham H. Nam. Nguyen X. Phuc, Le T. Tam and Le T. Lu, Optical properties and stability of aqueous dispersible and small hollow Au nanoparticles, RSC Advances, 11 (2021), 13458-13465.

8. Patent No. 37620: Process for manufacturing Fe3O4-Au hybrid optical materials with hollow structure, Intellectual Property Office of Vietnam,  issued on October 19, 2023.

9. Utility solution patent No. 3661: Advanced grounding material for electrical systems using a combination of graphene additives and metal anti-corrosion agents, Intellectual Property Office of Vietnam, issued on July 8, 2024.

10. Patent No. 42193: Method of manufacturing hybrid supercapacitors based on porous Zn and Mn-Co-S/conducting polymer electrodes, Intellectual Property Office of Vietnam, issued on November 28, 2024.

MAIN EQUIPMENT