Author, Institution: Marjan Monshi, Kaunas University of Technology
Science area, field of science: Natural Sciences, Physics, N002
Research supervisor: Prof. Dr. Hab. Sigitas Tamulevičius (Kaunas University of Technology, Natural Sciences, Physics, N002)
Dissertation Defence Board of Physics Science Field:
Prof. Dr. Diana Adlienė (Kaunas University of Technology, Natural Sciences, Physics, N002) – chairperson
Prof. Dr. Hab. Arvaidas Galdikas (Kaunas University of Technology, Natural Sciences, Physics, N002)
Prof. Dr. Liutauras Marcinauskas (Kaunas University of Technology, Natural Sciences, Physics, N002)
Assoc. Prof. Dr. Lina Mikoliūnaitė (Vilnius University, Natural Sciences, Chemistry, N003)
Prof. Dr. Horst-Gunter Rubahn (University of Southern Denmark, Denmark, Natural Sciences, Physics, N002)
Dissertation defence meeting will be at Rectorate Hall of Kaunas University of Technology (K. Donelaičio 73-402, Kaunas)
The doctoral dissertation is available at the library of Kaunas University of Technology (Gedimino 50, Kaunas) and on the internet: M. Monshi el. dissertation.pdf
© M. Monshi, 2026 “The text of the thesis may not be copied, distributed, published, made public, including by making it publicly available on computer networks (Internet), reproduced in any form or by any means, including, but not limited to, electronic, mechanical or other means. Pursuant to Article 25(1) of the Law on Copyright and Related Rights of the Republic of Lithuania, a person with a disability who has difficulties in reading a document of a thesis published on the Internet, and insofar as this is justified by a particular disability, shall request that the document be made available in an alternative form by e-mail to doktorantura@ktu.lt.”
Annotation: This dissertation addresses the challenges of synthesizing and characterizing stable graphene-metal hybrid structures for Surface-Enhanced Raman Scattering (SERS) applications. The research focuses on three key areas: optimizing Plasma-Enhanced Chemical Vapor Deposition (PECVD) synthesis, establishing quality assessment protocols for disordered carbon, and extending sensor longevity. First, a surface engineering strategy utilizing nickel nanoparticle pre-seeding was developed to homogenize graphene growth on polycrystalline foils. Second, a multi-spectroscopic framework integrating Raman, UV-Vis, and Transient Absorption Spectroscopy was established to evaluate nickel-encapsulated graphitic shells, validating them as oxidation-resistant platforms for UV-SERS. Finally, the protective efficacy of monolayer graphene on resonant silver nanoparticle arrays was quantified. The study demonstrated that the hybrid interface preserves chemical enhancement mechanisms, extending SERS signal retention to over one year compared to unprotected substrates.