Petra Pál

University of Debrecen

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István Csarnovics

University of Debrecen

M. Vereš

Wigner Research Centre for Physics

Attila Bonyár

Budapest University of Technology and Economics

Laura Juhász

University of Debrecen

Zoltán Erdélyi

University of Debrecen

ÁK

Ákos Kuki

University of Debrecen

Dávid Nyul

University of Debrecen

Imre Miklós Szilágyi

University of Miskolc

MÁ

Marcell Árpád Kordován

University of Debrecen

E. Baradács

University of Debrecen

Cooperative Institutions

University of Debrecen

Hungarian Academy of Sciences

Budapest University of Technology and Economics

Institute for Solid State Physics and Optics

Institute of Materials and Environmental Chemistry

Chang Gung University

Wigner Research Centre for Physics

University of Szeged

Institute for Technical Physics and Materials Science

Indian Institute of Technology Kharagpur

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Optimization of the production parameters of substrates for SERS applications

Petra Pál Attila Bonyár M. Vereš Laura Juhász István Csarnovics

In this work, we performed systematic studies on how SERS enhancement depends on the parameters of the gold substrate production technology which made by thermally produced. Based on the results, we propose which of the examined parameters achieved the highest SERS enhancement. enhancement.

10.1109/isse51996.2021.9467604

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An Investigation of Surface-Enhanced Raman Scattering of Different Analytes Adsorbed on Gold Nanoislands

Applied Sciences (2021)

Petra Pál Attila Bonyár M. Vereš Laura Juhász Melinda Szalóki

In this study, metallic nanoislands were prepared by thermal annealing of gold thin film produced by vacuum evaporation on a glass substrate to investigate the surface-enhanced Raman scattering (SERS) effect on them. The influence of the analyte on the enhancement factor of SERS was studied with riboflavin and rhodamine 6G dye. Two laser excitation sources at 532 and 633 nm wavelengths were used for SERS measurements. We found that the enhancement factors of the gold nanoisland SERS substrates were influenced by the analytes’ adsorption tendency onto their surfaces. The SERS amplification was also found to be dependent on the electronic structure of the molecules; higher enhancement factors were obtained for rhodamine 6G with 532 nm excitation, while for riboflavin the 633 nm source performed better.

Rhodamine 6G

Rhodamine

10.3390/app11219838

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Citations (12)

Organic Solvent-Based Li–Air Batteries with Cotton and Charcoal Cathode

Journal of The Electrochemical Society (2024)

Lajos Nagy Haymana Serra Üneri Marcell Árpád Kordován Tibor Nagy Ákos Kuki

We report on the construction and investigation of Li–air batteries consisting of a charcoal cathode and cotton texture soaked with different organic solvents containing a lithium triflate (LiOTf) electrolyte. Charcoal was found to be an appropriate cathode for Li–air batteries. Furthermore, cycling tests showed stable operation at over 800 cycles when dimethyl sulfoxide (DMSO) and diethylene glycol dimethyl ether (DEGME) were used as solvents, whereas low electrochemical stability was observed when propylene carbonate was used. The charging, discharging, and long-term discharging steps were mathematically modeled. Electrochemical impedance spectroscopy showed Gerischer impedance, suggesting intensive oxygen transport at the surface of the charcoal cathode. Diffusion, charge transfer, and solid electrolyte interphase processes were identified using distribution of relaxation time analysis. In the polypropylene (PP) membrane soaked with LiOTf in DEGME, three different states of Li ions were identified by 7 Li-triple-quantum time proportional phase increment nuclear magnetic resonance measurements. On the basis of the latter results, a mechanism was suggested for Li-ion transport inside the PP membrane. The activity of the charcoal cathode was confirmed by Raman and cyclic voltammetry measurements.

Charcoal

10.1149/1945-7111/ad3857

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Citations (1)

A generalized exponential relationship between the surface-enhanced Raman scattering (SERS) efficiency of gold/silver nanoisland arrangements and their non-dimensional interparticle distance/particle diameter ratio

Sensors and Actuators A Physical (2020)

Petra Pál Attila Bonyár M. Vereš L. Himics László Balázs

The optimization of the geometrical properties of gold/silver nanoparticle arrangements to maximize their surface-enhanced Raman scattering (SERS) efficiency is studied in this work. For this purpose, the metallic nanostructures were created by thermally annealing gold and silver thin film layers deposited onto glass substrates. The SERS capabilities of the samples were evaluated by measuring an analyte solution of benzophenone with three different excitation laser wavelengths. Systematic investigations were carried out on different gold and silver nanoisland samples to determine how the SERS enhancement depends on the geometrical (particle diameter, interparticle distance) and optical parameters (plasmon wavelength) of the nanostructures, as well as on the wavelength of laser excitation. The importance of matching the excitation wavelength with the resonant plasmon absorbance properties of the surface was proved. However, it was also shown that the optimization of the geometrical properties of the nanoisland arrangements dominates over the selection of the excitation wavelength. A generalized exponential relationship between the SERS enhancement and the non-dimensional interparticle distance/particle diameter ratio was established. Optimal technological parameters for the fabrication of gold/silver nanoisland SERS substrates were proposed.

Silver nanoparticle

Discrete dipole approximation

Absorbance

Particle (ecology)

10.1016/j.sna.2020.112225

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Citations (49)

The Effect of the PVA/Chitosan/Citric Acid Ratio on the Hydrophilicity of Electrospun Nanofiber Meshes

Polymers (2021)

Zsuzsanna Czibulya A. Csík Ferenc Tóth Petra Pál István Csarnovics

In this study, scaffolds were prepared via an electrospinning method for application in oral cavities. The hydrophilicity of the fiber mesh is of paramount importance, as it promotes cell spreading; however, the most commonly used polyvinyl alcohol (PVA) and other hydrophilic fiber meshes immediately disintegrate in aqueous media. In contrast, the excessive hydrophobicity of the scaffolds already inhibits cells adhesion on the surface. Therefore, the hydrophilicity of the fiber meshes needed to be optimized. Scaffolds with different polyvinyl alcohol (PVA)/chitosan/citric acid ratios were prepared. The addition of chitosan and the heat initiated cross-linkage of the polymers via citric acid enhanced the scaffolds' hydrophobicity. The optimization of this property could be followed by contact angle measurements, and the increased number of cross-linkages were also supported by IR spectroscopy results. The fibers' physical parameters were monitored via low-vacuum scanning electron microscopy (SEM) and atomic force microscopy (AFM). As biocompatibility is essential for dental applications, Alamar Blue assay was used to prove that meshes do not have any negative effects on dental pulp stem cells. Our results showed that the optimization of the fiber nets was successful, as they will not disintegrate in intraoral cavities during dental applications.

Polyvinyl Alcohol

Electrospinning

Biocompatibility

10.3390/polym13203557

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Citations (29)

Fabrication of Nanoparticle Agglomerate Films by Spark Ablation and Their Application in Surface-Enhanced Raman Spectroscopy

Chemosensors (2023)

Petra Pál Viktória Horváth Laura Juhász Zoltán Kóródi Attila Kohut

This paper presents a systematic study of the investigation of nanoparticle (NP) agglomerate films fabricated via depositing spark-generated Au, Ag, and Au/Ag NPs onto quartz microscope coverslips in a low-pressure inertial impactor. The primary focus of the study is to characterize these nanostructures and to examine their potential application in surface-enhanced Raman spectroscopy (SERS). The characterization of the produced nanostructures was carried out by performing optical absorbance measurements, morphology, and composition analysis, as well as testing the SERS performance of the NP films at three different excitation laser wavelengths in the visible range. The study aims to investigate the relationship between the optical properties, the morphology, and the enhancement of the produced samples at different excitations, and the results are presented and discussed. The study highlights the potential of using spark ablation and inertial impaction-based deposition as a method for producing nanoparticle films for SERS.

Agglomerate

Absorbance

Laser Ablation

Characterization

10.3390/chemosensors11030180

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Citations (3)

Identification of histidine‐Ni (II) metal complex by Raman spectroscopy

Journal of Raman Spectroscopy (2022)

Petra Pál M. Vereš R. Holomb Melinda Szalóki Attila Gábor Szöllősi

Abstract Metal ions such as nickel have a strong binding affinity to amino acids and form metal complexes of different geometry. This complex formation is influenced by many factors among others the kind of reactants and their relative concentrations, pH, and its effect on the net charge of the amino acid molecule. In this work, the formation of the histidine‐nickel (II) complex in different conditions was examined by Raman spectroscopy. In addition to the experiments, density functional theory (DFT) calculations on histidine‐nickel complexes were performed in order to elucidate the complex formation mechanism and optimal geometry of the structures as well as to investigate their vibrational properties. The Raman measurements showed double peaks at 1272 and 1297 cm −1 , and triple peaks at 1322, 1336, and 1355 cm −1 that belong to the metal complex. The geometry optimizations and total energy calculations of His‐Ni (II) complex revealed that the octahedral geometry and the triplet spin state of Ni ion is the energetically favorable structure. This metal complex is formed through the nitrogen atom of the imidazole side chain, the nitrogen atom of the terminal amino group, and the oxygen atom of the carboxyl group. Experiments with pH revealed that the alkaline pH favors while the change of the concentration of the metal ions does not affect the the His‐Ni (II) complex formation.

Octahedral molecular geometry

Imidazole

10.1002/jrs.6490

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Citations (6)

Performance Analysis of Multi-metallic Sensor Chip for the Real-time Quantification of EV 71 Virus with SPR Biosensor

Extended Abstracts of the 2020 International Conference on Solid State Devices and Materials (2017)

Azharul Alom Briliant Adhi Prabowo Petra Pál Muhammad Khari Secario Po-Ting Ou

Lab-on-a-Chip

10.7567/ssdm.2017.f-6-02

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Effect of different analyte solutions on the SERS process examined on gold nanoisland samples

Petra Pál István Csarnovics M. Vereš Attila Bonyár

In this work, we are examining the effect of the analyte on the process of Surface-Enhanced Raman Scattering (SERS). Benzophenone and riboflavin solutions were used as analytes for the measurements. The enhancement was measured on the same gold nanoisland substrates for both analytes at two different excitation wavelengths (532 and 633 nm). The enhancement factor was obtained for both analytes, and the influence of the analytes was studied.

Excitation wavelength

10.1109/siitme50350.2020.9292172

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3d Printed Li-Air Batteries with Electrolyte Containing Organic Solvents and Charcoal Cathode

Lajos Nagy Üneri Haymana Serra Marcell Árpád Kordován Tibor Nagy Ákos Kuki

In this paper, we report the construction and investigation of 3D printed Li-air batteries consisting of charcoal cathode and cotton texture soaked with different organic solvents containing lithium triflate (LiOTf) electrolyte. Charcoal was found to be appropriate cathode for Li-Air batteries, furthermore, cycling tests showed stable operation over 800 cycles in the cases of dimethyl sulfoxide (DMSO) and diethylene glycol dimethyl ether (DEGME) solvents, while for propylene carbonate (PC) low electrochemical stability was observed. Charging, discharging and long-term discharging steps were mathematically modeled. The electrochemical impedance spectroscopy (EIS) showed Gerischer impedance suggesting intensive oxygen transport at the surface of charcoal cathode. Diffusion, charge transfer and solid electrolyte interphase (SEI) processes were identified by means of distribution of relaxation time (DRT) analysis. In the polypropylene (PP) membrane soaked with LiOTf in DEGME, three different states of Li-ions were identified by 7Li-triple-quantum time proportional phase increment (TQTPPI) NMR measurements. Based on the latter results a mechanism was suggested for the Li-ion transport inside the PP membrane. The activity of charcoal cathode was confirmed by Raman and cyclic voltammetry (CV) measurements.

Charcoal

10.2139/ssrn.4609493

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Citations (0)