INTERM 2025 (Mugla, Turcia) – 2 Prezentări Invitate
INVITED SPEAKER Id-772
Raman Microscopy and Spectroscopy of Carbon Nanocomposite Materials for EMI Shielding Performance
C. PACHIUA*, I.V. TUDOSEB, M. SUCHEAA, M. KOUDOUMASA, O. IONESCUA
- National Institute for Research and Development in Microtechnologies (IMT-Bucharest), 126A Erou Iancu Nicolae Street, Voluntari 077190, Romania
- Center of Materials Technology and Photonics, School of Engineering, Hellenic Mediterranean University, 71410 Heraklion, Crete, Greece
* Corresponding author: cristina.pachiu@imt.ro
Abstract. The growing demand for efficient electromagnetic interference (EMI) shielding materials has led to the exploration of novel carbon-based nanocomposites due to their exceptional electrical conductivity, mechanical strength, and versatility. This work investigates the application of Raman microscopy and spectroscopy to characterize carbon nanocomposite materials, with a focus on their potential for EMI shielding. The study employs Raman spectroscopy to analyze the structural and electronic properties of various carbon-based nanomaterials, such as graphene, carbon nanotubes (CNTs), and graphene oxide, graphene nano-onions (CNOs) incorporated into composite matrices. Raman modes such as the G and D bands are used to probe the degree of graphitization, defects, and interactions between the carbon nanomaterials and the composite matrix, which are key factors influencing the EMI shielding effectiveness (SE). The correlation between Raman spectra and the materials’ electrical conductivity, microstructure, and EMI shielding performance is explored. Results indicate that tailored nanocomposites with controlled dispersion and alignment of carbon nanomaterials offer enhanced shielding performance, and Raman spectroscopy provides a valuable tool for real-time monitoring of material properties at the nanoscale. This work highlights the role of Raman spectroscopy in the design and optimization of carbon nanocomposites for advanced EMI shielding applications. Keywords: Carbon Nanomaterials (CNs); Raman Microscopy; EMI Shielding Performance.
INVITED SPEAKER Id-780
Morphological and Structural Characterization of Metal Oxide-Based Materials for Advanced Optoelectronic Applications
O. BRINCOVEANUA*, C. PACHIUA, C. ROMANITANA, P. PASCARIUB, E. KOUDOUMASA,C,M. P. SUCHEAA,C
- National Institute for Research and Development in Microtechnologies – IMT Bucharest, 126A, Erou Iancu Nicolae Street, 077190, Voluntari-Bucharest, ROMANIA
- ”Petru Poni” Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487, Iasi, Romania
- Center of Materials Technology and Photonics, School of Engineering, Hellenic Mediterranean University (HUM), 71410 Heraklion, Crete, Greece
* Corresponding Author: oana.brincoveanu@imt.ro
Abstract. Metal oxide-based materials, particularly zinc oxide (ZnO), are prominent candidates for advanced optoelectronic applications due to their unique structural, optical, and electronic properties. This research investigates the morphological and structural characteristics of ZnO doped with rare-earth elements such as lanthanum (La), europium (Eu), and samarium (Sm), etc., focusing on the modifications induced by doping. Rare-earth doping alters the electronic structure, enhances conductivity, introduces defect states, and enables novel functionalities beneficial for optoelectronic devices. Comprehensive characterization techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD), were employed to analyze the crystalline structure and surface morphology of the doped materials. XRD revealed enhanced crystallinity and phase stability, with lattice parameter variations indicating successful doping. Morphological analyses showed a strong effect of the dopant concentration on the materials structuring, leading to various morphologies. Theoretical simulations indicated a strong correlation between optical bandgap shifts and La concentration, highlighting the influence of cluster size and morphology on optical properties. Additionally, computational predictions of the dielectric constant revealed the impact of microstructural topology on material performance, providing insights for tuning ZnO properties. Distinct microstructural features, such as “fluffy” clusters composed of crystalline grains and rods, emphasize the potential of rare-earth doping in tailoring ZnO’s properties. The integration of experimental and theoretical methodologies offers a comprehensive framework for understanding the synergistic effects of doping and nanostructuring. This study advances the development of ZnO-based materials, opening avenues for next-generation optoelectronic devices optimized for specific electromagnetic radiation absorption and other targeted functionalities.
Keywords: Metal Oxide-based Materials; ZnO-based Materials; Rare-earth Doping. Acknowledgments: This research was funded by PNRR/2022/C9/MCID/I8 CF23/14 11 2022 contract 760101/23.05.2023 financed by the Ministry of Research, Innovation and Digitalization in “Development of a program to attract highly specialized human resources from abroad in research, development, and innovation activities” within the – PNRR-IIIC9-2022 – I8 PNRR/2022/Component 9/investment 8 and IMT’s contribution was partially supported by Romanian Ministry of Research, Innovation and Digitalisation through the μNanoEl, Cod: 23 07 core Programme.