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1.

001-es BibID:BIBFORM077324
Első szerző:Bonyár Attila
Cím:Elastic modulus and energy dissipation measurements with AFM on chalcogenide thin films / Attila Bonyár, Judit Kámán, István Csarnovics
Dátum:2014
Megjegyzések:Contact-mode point spectroscopy and tapping-mode imaging atomic force microscopy (AFM) techniques were used to measure the Young's Modulus and tip-surface energy dissipation of amorphous chalcogenide thin films. As 20 Se 80 thin film was prepared by thermal evaporation on glass substrates, and a He-Ne laser (633 nm) was used to prepare a holographic grating on the thin film. The results from both AFM measurement techniques indicate that there are significant differences between the peaks and valleys of the grating in terms of elasticity and tip-surface energy dissipation
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák tanulmány, értekezés
Megjelenés:Proceedings of 2014 IEEE 20th International Symposium for Design and Technology in Electronic Packaging (SIITME) / Eds. Zsolt Illyefalvi-Vitez, Norocel Codreanu. - p. 31-34. -
További szerzők:Kámán Judit Csarnovics István (1986-) (fizikus)
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2.

001-es BibID:BIBFORM077314
Első szerző:Bonyár Attila
Cím:Characterization of the shape of gold nanoparticles prepared by thermal annealing / Attila Bonyár, Judit Kámán, István Csarnovics, László Balázs
Dátum:2016
Megjegyzések:Gold nanoparticles - which are intended to be used as transducers in a localized surface plasmon resonance (LSPR) sensor - were prepared by thermally annealing various layers of gold thin films deposited on glass substrate. The size and distribution of nanoparticles were investigated by atomic force microscopy (AFM). The changes in the nanoparticle shape in function of the deposition and annealing parameters are characterized. A novel parameter called localization factor was used to investigate the shape of the resulting particles. A common problem concerning the AFM imaging of nanoparticles, namely the tip convolution effect was studied, and possibilities to use the localization factor parameter to optimize surface reconstruction algorithms via tip deconvolution is demonstrated.
ISBN:978-1-5090-4445-0
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák tanulmány, értekezés
Megjelenés:2016 IEEE 22nd International Symposium for Design and Technology in Electronic Packaging (SIITME). - p. 25-31. -
További szerzők:Kámán Judit Csarnovics István (1986-) (fizikus) Balázs László (fizikus)
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3.

001-es BibID:BIBFORM077313
Első szerző:Bonyár Attila
Cím:Investigation of the Performance of Thermally Generated Au/Ag Nanoislands for SERS and LSPR Applications / Bonyár A., Csarnovics I., Veres M., Himics L., Csík A., Kámán J., Balázs L., Kökényesi S.
Dátum:2016
ISSN:1877-7058
Megjegyzések:In this work the performance of Au/Ag nanoislands was investigated for Surface Enhanced Raman Spectroscopy (SERS) and Localized Surface Plasmon Resonance (LSPR) applications. The nanoislands were generated by thermally annealing thin layers of silver and gold (having thickness in the 5-15 nm range), which were previously sputtered onto glass surfaces. Both pure (silver and gold nanoparticles ? AuNP and AgNP) and composite metallic systems (silver-gold core-shell structures ? Ag-Au core-shell) were evaluated based on their plasmonic and SERS sensitivity. Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) were used to measure the size, shape and distribution of the nanoparticles to correlate them with the obtained plasmonic/Raman capabilities. The technological parameters of nanoisland fabrication for optimal sensitivities are presented
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák konferenciacikk
Megjelenés:Procedia Engineering. - 168 (2016), p. 1152-1155. -
További szerzők:Csarnovics István (1986-) (fizikus) Veres M. Himics László Csik Attila (1975-) (fizikus) Kámán Judit Balázs László (fizikus) Kökényesi Sándor (1946-) (fizikus)
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4.

001-es BibID:BIBFORM075974
035-os BibID:(WoS)000414151800052 (Scopus)85027556910
Első szerző:Bonyár Attila
Cím:Investigation of the performance of thermally generated gold nanoislands for LSPR and SERS applications / Bonyár A., Csarnovics I., Veres M., Himics L., Csik A., Kámán J., Balázs L., Kökényesi S.
Dátum:2018
ISSN:0925-4005
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Sensors And Actuators B-Chemical. - 255 (2018), p. 433-439. -
További szerzők:Csarnovics István (1986-) (fizikus) Veres M. Himics László Csik Attila (1975-) (fizikus) Kámán Judit Balázs László (fizikus) Kökényesi Sándor (1946-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00041
GINOP
TÁMOP-4.2.4.A/2-11-1-2012-0001
TÁMOP
TÁMOP-4.2.2.A-11/1/KONV-2012-0036
TÁMOP
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5.

001-es BibID:BIBFORM077308
Első szerző:Csarnovics István (fizikus)
Cím:Light Sensitive Plasmonic Nanostructures for Photonic Applications / Istvan Csarnovics, Attila Bonyar, Miklos Veres, Laszlo Himics, Attila Csik, Judit Kaman, Julia Burunkova, Geza Szanto, Laszlo Balazs, Sandor Kokenyesi
Dátum:2018
Megjegyzések:In this work, the performance of gold nanoparticles were investigated for stimulation of photosensitive materials for photonic applications. It was widely used for surface plasmon resonance experiments, not in the last place because of the manifestation of optical resonances in the visible spectral region. The localized surface plasmon resonance is rather easily observed in nanometer-sized metallic structures and widely used for measurements, sensing, in semiconductor devices and even in optical data storage. Firstly, gold nanoparticles on silica glass substrate satisfy the conditions for surface plasmon resonance in the green-red spectral range, where the chalcogenide glasses have the highest sensitivity. The gold nanostructures influence and enhance the optical, structural and volume changes and promote the exciton generation in gold nanoparticles/chalcogenide layer structure. The experimental results support the importance of localized electric fields in the photo-induced transformation of chalcogenide glasses as well as suggest new approaches to improve the performance of these optical recording media. Results may be utilized for direct, micrometre- or submicron size geometrical and optical pattern formation and used also for further development of the explanations of these effects in chalcogenide glasses. Besides of that, gold nanoparticles could be added to the organic light-sensitive material. The acrylate-based materials are frequently used for optical, holographic recording of optoelectronic elements due to photo-stimulated structural transformations. The holographic recording process and photo-polymerization effect could be enhanced by the localized plasmon field of the created gold nanostructures. Finally, gold nanoparticles widely used for electrochemical and optical sensor applications. Although these NPs can be synthesized in several ways, perhaps one of the simplest methods is the thermal annealing of pre-deposited thin films on glass or silicon surfaces. With this method, the parameters of the annealing process (time, temperature) and the pre-deposited thin film thickness influence and define the resulting size and distribution of the NPs on the surface. Localized surface plasmon resonance (LSPR) is a very sensitive optical phenomenon and can be utilized for a large variety of sensing purposes (chemical sensors, gas sensors, biosensors, etc.). Surface-enhanced Raman spectroscopy (SERS) is an analytical method which can significantly increase the yield of Raman scattering of target molecules adsorbed on the surface of metallic nanoparticles. The sensitivity of LSPR and SERS based devices is strongly depending on the used material and also on the size and geometry of the metallic nanoparticles. By controlling these parameters the plasmon absorption band can be tuned and the sensitivity can be optimized. The technological parameters of the generated gold nanoparticles were investigated and influence on the SERS and on the LSPR sensitivity was established. The LSPR sensitivity were simulated for gold nanocubes and nanospheres with MNPBEM Matlab toolbox. It was found that the enhancement factor (which characterize the increase in the peak shift for multi-particle arrangements compared to single-particle models) depends on the size of the nanoparticles and on the distance between the particles.
Tárgyszavak:Természettudományok Fizikai tudományok idézhető absztrakt
Megjelenés:International Journal of Physical and Mathematical Sciences. - 12 : 5 (2018), p. 1. -
További szerzők:Bonyár Attila Veres Miklós Himics László Csik Attila (1975-) (fizikus) Kámán Judit Burunkova, Julia (vegyész) Szántó Géza (1987-) (fizikus) Balázs László (fizikus) Kökényesi Sándor (1946-) (fizikus)
Pályázati támogatás:GINOP-2.3.2-15-2016-00041
GINOP
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6.

001-es BibID:BIBFORM077321
Első szerző:Kámán Judit
Cím:Investigation of mechanical properties of the generated surface structures on a chalcogenide thin film with AFM / Judit Kámán, Attila Bonyár, István Csarnovics, Csaba Cserháti
Dátum:2015
Megjegyzések:Light induced holographic grating and electron beam induced stripes were created on Ge28Se72 chalcogenide thin film and its local surface mechanical properties were studied by AFM. The Young's moduli of the grating, the stripes and the reference area were determined through force curves and the tip-sample energy dissipation was calculated from the tapping mode point spectroscopy curves. Significant difference was obtained between the created structures and the reference area regarding the Young's modulus and the tip-sample energy dissipation.
ISBN:978-1-5090-0332-7
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák tanulmány, értekezés
Megjelenés:2015 IEEE 21st International Symposium for Design and Technology in Electronic Packaging (SIITME), Brasov, Romania, 22-25 October, 2015 / ed. Zsolt Illyefalvi-Vitéz. - p. 51-55. -
További szerzők:Bonyár Attila Csarnovics István (1986-) (fizikus) Cserháti Csaba (1963-) (fizikus)
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