Author, Institution: Nadzeya Khinevich, Kaunas University of Technology
Science area, field of science: Natural Sciences, Physics, N002
Scientific Supervisor: Prof. Dr. Hab. Sigitas Tamulevičius (Kaunas University of Technology, Natural Sciences, Physics, N002)
Dissertation Defense Board of Physics Science Field:
Prof. Dr. Diana Adlienė (Kaunas University of Technology, Natural Sciences, Physics, N002) – chairperson
Prof. Dr. Ramūnas Aleksiejūnas (Vilnius University, Natural Sciences, Physics, N002)
Assoc. Prof. Dr. Jacek Fiutowski (University of Southern Denmark, Denmark, Natural Sciences, Physics, N002)
Assoc. Prof. Dr. Ieva Plikusienė (Vilnius University, Natural Sciences, Chemistry, N003)
Prof. Dr. Rolandas Tamošiūnas (Vilnius University, Natural Sciences, Physics, N002)
Dissertation defense 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: N. Khinevich el. dissertation (PDF)
Annotation: The dissertation explores the application of surface-enhanced Raman scattering spectroscopy (SERS) in various fields, highlighting its potential in biosensing. Despite significant advances in the fields of nanomaterials and plasmonics, the practical use of SERS remains a challenge due to the lack of inexpensive, reproducible, and highly efficient substrates. This research aims to address these gaps by exploring metallized porous silicon (PS) structures and periodic nanoparticle (NP) arrays to improve SERS sensitivity. The research focuses on synthesizing chemically homogeneous silver nanoparticles (AgNPs) and studying their ultrafast optomechanical properties. In addition, the fabrication of irregular and regular SERS-active substrates using capillary particle deposition is investigated and their sensitivity is assessed using organosulfur compounds as target molecules. Key results include optimal conditions for the synthesis of monodisperse AgNPs, investigation of ultrafast relaxation of charge carriers in AgNPs, and development of PS structures as templates for AgNP arrays. Additionally, the study demonstrates wavelength-tailored SERS substrates with enhanced sensitivity achieved by tuning the plasmon resonance to the excitation laser wavelength and creating hot spots in periodic NP arrays. The thesis contributes to the field by proposing new approaches to improve SERS sensitivity, paving the way for practical applications in biosensing.
May 31 d. 13:00
Rectorate Hall at Kaunas University of Technology (K. Donelaičio 73-402, Kaunas)
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