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Poster

Modification of metal nanoparticles via femtosecond laser pulses and their application for SERS

Wednesday (24.06.2020)
13:37 - 13:40 Room 1
Part of:
Line-Up:
- Poster Periodic microstructuring of metal moulds using direct laser interference patterning for nanoimprint replication 1 Dr. Marcos Soldera
- Poster Comparison of structural colors achieved by laser induced periodic surface structures and direct laser interference patterning 1 Dr. Marcos Soldera
- Poster *student* Wetting properties of the aluminium surface structures fabricated using Direct Laser Interference Patterning with picosecond and femtosecond pulses 1 Dipl.-Ing. Stephan Milles
- Poster The numerical realization of a model of interaction of ultrashort laser pulses with solid 1 Prof. Vladimir Zhukov
- Poster On the problem of the initial conditions for tightly-focused ultrashort laser pulses in the modeling of laser beam propagation in transparent solids 1 Prof. Vladimir Zhukov
- Poster Innovative polymer coating systems – applied by laser sintering technique 1 Dr. Anna Buling
- Poster Tangential laser turning of fused silica usin ultra-short laser pulses 1 Julian Zettl
- Poster Process optimization of Direct Laser Interference Patterning 1 Dr. Bogdan Voisiat
- Poster Dynamic aberration correction via spatial light modulator (SLM) for femtosecond direct laser writing 1 Gabrielius Kontenis
- Poster Modification of metal nanoparticles via femtosecond laser pulses and their application for SERS 1 Dr. Asta Tamuleviciene
- Poster Ultraviolet and Infrared Femtosecond Laser Irradiation of Thermoplastics PET and PA66 1 Dr. Xxx Sedao
- Poster High pulse energy femtosecond laser machining station for the interference and parallel processing 1 Dr. Simonas Indrisiunas
- Poster Laser material processing with a multi-beam setup based on Excited State Absorption 1 Sebastian Engel
- Poster GO-neutral red nanocomposite reduction by pulsed laser irradiation 1 Dr. Romualdas Trusovas
- Poster *student* Numerical simulation of energy relaxation in Mo thin films exposed to femtosecond laser pulse 1 Kryštof Hlinomaz
- Poster Modification of medical-grade poly(L-lactide) using femtosecond laser filamentation 1 Dr. Bogusz Stepak
Session Chair


Session PS: Poster Session 02
Belongs to:
Topic PS: Poster Session


Metal nanoparticles are attracting a lot of attention recently due to their size and shape dependant optical properties. The resonant collective free electron oscillations in the confined space results in the so-called localized surface plasmons having sharp resonances in the optical spectra [1]. Historically metal nanoparticles were primarily synthesized chemically but with the advent of ultra-short pulse lasers new pathways of synthesis and post processing of the nanoparticles have emerged [2]. Chemical synthesis routes are well elaborated nowadays and one can control size, shape and internal structure in a wide range and volumes of synthesized colloidal solutions may be suitable for industrial applications [3]. Another path to change the morphology, size and shape of chemically pre-synthesized nanoparticles is by irradiation of colloidal solution with ultrashort laser pulses.

In the current research we have synthesized silver nanoparticles via polyol synthesis route [4]. The stock solutions were irradiated with a fundamental harmonic (λ=1030 nm) of a Yb:KGW femtosecond laser (Pharos, Light Conversion). The dependences of the resulting nanoparticles’ optical properties and size distributions on the laser processing conditions, namely pulse energy, keeping constant irradiation time of 30 minutes, were investigated. Surface enhancement of the Raman scattering (SERS) was investigated with 2-naphthalene thiol (2NT) of 10-6M concentration and laser processing conditions ensuring the highest signals were identified.

The absorption of colloidal solutions changed drastically after the irradiation as shown in Fig. 1 a. The surface plasmon resonance peak became narrower and blue shifted indicating the reduction of the average particle size and increased monodispersity (Fig. 1, a). The electron microscopy of the nanoparticles (Fig. 1 b, c) indicated fracturing and rounding of the nanoparticles.

From the Raman scattering spectra (Fig. 1, d) it was obtained that modified nanoparticles demonstrated higher enhancement than the synthesised ones and the enhancement itself depends on the laser treatment. The highest enhancement was obtained for nanoparticles that were modified with 80 mW laser power.

Speaker:
Dr. Asta Tamuleviciene
Kaunas University of Technology
Additional Authors:
  • Mantas Mikalkevičius
    Kaunas University of Technology
  • Mindaugas Juodėnas
    Kaunas University of Technology
  • Gerda Klimaitė
    Kaunas University of Technology
  • Dr. Domantas Peckus
    Kaunas University of Technology
  • Prof. Dr. Tomas Tamulevičius
    Kaunas University of Technology
  • Prof. Dr. Sigitas Tamulevičius
    Kaunas University of Technology

Dateien

Category Short file description File description File Size
Poster Abstract Abstract for the conference section L04-Nanotechnology 242 KB Download
Poster Poster presentation Poster presentation (A0) 4 MB Download