TY - JOUR AU - Kertész, Krisztián Imre AU - Piszter, Gábor AU - Vargáné Beck, Andrea AU - Horváth, Anita AU - Nagy, G. AU - Molnár, György AU - Radnóczi, György Zoltán AU - Horváth, Zsolt Endre AU - Illés, Levente AU - Biró, László Péter TI - Hybrid Bio-Nanocomposites by Integrating Nanoscale Au in Butterfly Scales Colored by Photonic Nanoarchitectures JF - PHOTONICS J2 - PHOTONICS-BASEL VL - 10 PY - 2023 IS - 11 PG - 15 SN - 2304-6732 DO - 10.3390/photonics10111275 UR - https://m2.mtmt.hu/api/publication/34538415 ID - 34538415 LA - English DB - MTMT ER - TY - JOUR AU - Kovács, Dávid AU - Deák, András AU - Radnóczi, György Zoltán AU - Horváth, Zsolt Endre AU - Sulyok, Attila AU - Schiller, Róbert AU - Czömpöly, Ottó Sámuel AU - Zámbó, Dániel TI - Position of gold dictates the photophysical and photocatalytic properties of Cu2O in Cu2O/Au multicomponent nanoparticles JF - JOURNAL OF MATERIALS CHEMISTRY C J2 - J MATER CHEM C VL - 11 PY - 2023 IS - 26 SP - 8796 EP - 8807 PG - 12 SN - 2050-7526 DO - 10.1039/d3tc01213a UR - https://m2.mtmt.hu/api/publication/34538294 ID - 34538294 LA - English DB - MTMT ER - TY - JOUR AU - Schilirò, E. AU - Panasci, S.E. AU - Mio, A.M. AU - Nicotra, G. AU - Agnello, S. AU - Pécz, Béla AU - Radnóczi, György Zoltán AU - Deretzis, I. AU - La, Magna A. AU - Roccaforte, F. AU - Lo, Nigro R. AU - Giannazzo, F. TI - Direct atomic layer deposition of ultra-thin Al2O3 and HfO2 films on gold-supported monolayer MoS2 JF - APPLIED SURFACE SCIENCE J2 - APPL SURF SCI VL - 630 PY - 2023 PG - 11 SN - 0169-4332 DO - 10.1016/j.apsusc.2023.157476 UR - https://m2.mtmt.hu/api/publication/33836721 ID - 33836721 AB - In this paper, the atomic layer deposition (ALD) of ultra-thin films (<4 nm) of Al2O3 and HfO2 on gold-supported monolayer (1L) MoS2 is investigated, providing an insight on the mechanisms ruling the nucleation in the early stages of the ALD process. A preliminary multiscale characterization of large area 1L-MoS2 exfoliated on sputter-grown Au/Ni films demonstrated: (i) a tensile strain (from 0.1 to 0.3%) and p-type doping (from 1 × 1012 to 4 × 1012 cm−2) distribution at micro-scale; (ii) an almost conformal MoS2 membrane to the Au grains topography, with some locally detached regions, indicating the occurrence of strain variations at the nanoscale; (iii) atomic scale variability (from ∼ 4.0 to ∼ 4.5 Å) in the Mo-Au atomic distances was detected, depending on the local configuration of Au nanograins. Ab initio DFT calculations of a free-standing MoS2 layer and a simplified MoS2/Au(111) interface model showed a significant influence of the Au substrate on the MoS2 energy band structure, whereas small differences were accounted for the adsorption of H2O, TMA (co-reactant, and Al-precursor, respectively) molecules, and a slight improved adsorption was predicted for TDMAHf (Hf-precursor). This suggests a crucial role of nanoscale morphological effects, such as the experimentally observed local curvature and strain of the MoS2 membrane, in the enhanced physisorption of the precursors. Afterwards the nucleation and growth of Al2O3 an HfO2 films onto 1L-MoS2/Au was investigated in detail, by monitoring the surface coverage as a function of the number (N) of ALD cycles, with N from 10 to 120. At low N values, a slower growth rate of the initially formed nuclei was observed for HfO2, probably due to the bulky nature of the TDMAHf precursor as compared to TMA. On the other hand, the formation of continuous films was obtained in both cases for N > 80 ALD cycles, corresponding to ∼ 3.6 nm Al2O3 and ∼ 3.1 nm HfO2. Current mapping on these ultra-thin films by conductive-AFM showed, for the same applied bias, a uniform insulating behavior of Al2O3 and the occurrence of few localized breakdown spots in the case of HfO2, associated to a less compact films regions. Finally, an increase of the 1L-MoS2 tensile strain was observed by Raman mapping after encapsulation with both high-κ films, accompanied by a reduction in the PL intensity, explained by the effects of strain and the higher effective dielectric constant of the surrounding environment. LA - English DB - MTMT ER - TY - CHAP AU - Radnóczi, György Zoltán ED - Kittel, Ágnes ED - Solymosi, Katalin ED - Barna, László TI - Fókuszált ionsugárral készített minták tisztítása kis-energiás Ar+ ionnyalábbal T2 - A Magyar Mikroszkópos Társaság 2022 Konferenciájának Kivonatkönyve PB - Magyar Mikroszkópos Társaság CY - Budapest SN - 9786158210706 PY - 2022 SP - 121 EP - 121 PG - 1 UR - https://m2.mtmt.hu/api/publication/33342328 ID - 33342328 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Villy, Lajos Péter AU - Kohut, Attila AU - Kéri, Albert AU - Bélteki, Ádám AU - Radnóczi, György AU - Fogarassy, Zsolt AU - Radnóczi, György Zoltán AU - Galbács, Gábor AU - Geretovszky, Zsolt TI - Continuous spark plasma synthesis of Au/Co binary nanoparticles with tunable properties JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 12 PY - 2022 IS - 1 PG - 9 SN - 2045-2322 DO - 10.1038/s41598-022-22928-0 UR - https://m2.mtmt.hu/api/publication/33208918 ID - 33208918 AB - We present here a scalable and environmentally friendly gas phase technique employing atmospheric pressure electrical spark discharge plasmas for the production of Au/Co binaries, an effective catalyst system for the decomposition of hydrogen-rich compounds, such as ammonium borane. We demonstrate that Au/Co alloy nanoparticles can be produced via the spark plasma-based technique. The possibility of varying the morphology and phase structure via real time heat treatment of the generated aerosol to form Au/Co/CoO particles with continuous control over a wide particle compositional range (from 24 to 64 at.% [Co]/([Co] + [Au]) content) is also demonstrated. Since our spark-based approach is proven to be capable of providing reasonable particle yields, these results may contribute to the transition of lab-scale, nanocatalyst-based hydrogen storage systems to real world applications. LA - English DB - MTMT ER - TY - JOUR AU - Pécz, Béla AU - Vouroutzis, Nikolaos AU - Radnóczi, György Zoltán AU - Frangis, Nikolaos AU - Stoemenos, John TI - Structural Characteristics of the Si Whiskers Grown by Ni-Metal-Induced-Lateral-Crystallization JF - NANOMATERIALS J2 - NANOMATERIALS-BASEL VL - 11 PY - 2021 IS - 8 PG - 14 SN - 2079-4991 DO - 10.3390/nano11081878 UR - https://m2.mtmt.hu/api/publication/32112570 ID - 32112570 LA - English DB - MTMT ER - TY - JOUR AU - Radnóczi, György AU - Dedoncker, R. AU - Radnóczi, György Zoltán AU - Czigány, Zsolt AU - Sulyok, Attila AU - Kovácsné Kis, Viktória AU - Depla, D. TI - The growth of a multi-principal element (CoCrFeMnNi) oxynitride film by direct current magnetron sputtering using air as reactive gas JF - SURFACE AND COATINGS TECHNOLOGY J2 - SURF COAT TECH VL - 421 PY - 2021 PG - 13 SN - 0257-8972 DO - 10.1016/j.surfcoat.2021.127433 UR - https://m2.mtmt.hu/api/publication/32078773 ID - 32078773 AB - CoCrFeMnNi multi-principal element alloy films were grown by direct current magnetron sputtering in a mixture of argon and air. The air fraction was varied from 4 to 50%, which resulted in a change of the phase state of the growing film. A 〈100〉 preferred orientation face centered cubic metal (doped with O and N) structure develops below 12% of air. Between 12 and 30% air, a two phase 〈100〉 preferred orientation face centered cubic metal + oxynitride (B1) structure forms. Above 30% of air a single phase B1 oxynitride structure is observed. Compared to nitrogen, oxygen is preferentially incorporated into the growing structures. The 〈100〉 preferential orientation is the result of selective nucleation (below 30% of air) or competing growth (above 30% of air) of the forming crystals. Detailed microscopic analysis shows a complex structure for both the metal and the oxynitride phase in the films deposited at low and high air fraction. In both cases, the films are characterized by local structures ordered on a few nanometer scale and their formation is explained as a result of spinodal decomposition of the as-formed homogenous structure which occurs during film growth. LA - English DB - MTMT ER - TY - GEN AU - Dodony, Erzsébet AU - Radnóczi, György Zoltán AU - Dódony, István TI - Reactions between amporphous thin films of silicon with nickel on heating PY - 2020 UR - https://m2.mtmt.hu/api/publication/31804509 ID - 31804509 LA - English DB - MTMT ER - TY - JOUR AU - Merkel, Dániel AU - Lengyel, Attila AU - Nagy, Dénes Lajos AU - Németh, Attila AU - Horváth, Zsolt Endre AU - Kovácsné Bogdán, Csilla AU - Gracheva, Maria AU - Hegedűs, Gergő AU - Sajti, Szilárd Mihály AU - Radnóczi, György Zoltán AU - Szilágyi, Edit TI - Reversible control of magnetism in FeRh thin films JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 10 PY - 2020 IS - 1 PG - 11 SN - 2045-2322 DO - 10.1038/s41598-020-70899-x UR - https://m2.mtmt.hu/api/publication/31408207 ID - 31408207 LA - English DB - MTMT ER - TY - JOUR AU - Radnóczi, György Zoltán AU - Herceg, Zoltán AU - Kiss, Tamás Rafael TI - HRTEM image-stitching for measurement of distances JF - RESOLUTION AND DISCOVERY J2 - RESOL DISCOVERY VL - 5 PY - 2020 IS - 1 SP - 13 EP - 17 PG - 5 SN - 2498-8707 DO - 10.1556/2051.2020.00086 UR - https://m2.mtmt.hu/api/publication/32174342 ID - 32174342 LA - English DB - MTMT ER -