@article{MTMT:32539659, title = {C 60 Br 24 /SWCNT: A Highly Sensitive Medium to Detect H 2 S via Inhomogeneous Carrier Doping}, url = {https://m2.mtmt.hu/api/publication/32539659}, author = {Zhou, Jin and Bagheri, Mohammad and Järvinen, Topias and Bartus Pravda, Cora and Kukovecz, Ákos and Komsa, Hannu-Pekka and Kordás, Krisztián}, doi = {10.1021/acsami.1c16807}, journal-iso = {ACS APPL MATER INTER}, journal = {ACS APPLIED MATERIALS & INTERFACES}, volume = {13}, unique-id = {32539659}, issn = {1944-8244}, year = {2021}, eissn = {1944-8252}, pages = {59067-59075}, orcid-numbers = {Kukovecz, Ákos/0000-0003-0716-9557; Komsa, Hannu-Pekka/0000-0002-0970-0957} } @article{MTMT:31827360, title = {Composites of ion-in-conjugation polysquaraine and SWCNTs for the detection of H 2 S and NH 3 at ppb concentrations}, url = {https://m2.mtmt.hu/api/publication/31827360}, author = {Zhou, Jin and Jarvinen, Topias and Pitkänen, Olli and Kónya, Zoltán and Kukovecz, Ákos and Kordás, Krisztián}, doi = {10.1088/1361-6528/abdf06}, journal-iso = {NANOTECHNOLOGY}, journal = {NANOTECHNOLOGY}, volume = {32}, unique-id = {31827360}, issn = {0957-4484}, year = {2021}, eissn = {1361-6528}, orcid-numbers = {Jarvinen, Topias/0000-0002-9256-748X; Pitkänen, Olli/0000-0003-2870-3229; Kónya, Zoltán/0000-0002-9406-8596; Kukovecz, Ákos/0000-0003-0716-9557} } @article{MTMT:31278305, title = {Grid-type transparent conductive thin films of carbon nanotubes as capacitive touch sensors}, url = {https://m2.mtmt.hu/api/publication/31278305}, author = {Valasma, Ronja and Bozo, Eva and Pitkänen, Olli and Jarvinen, Topias and Dombovari, Aron and Mohl, Melinda and Lorite, Gabriela S and Kiss, János and Kónya, Zoltán and Kordás, Krisztián}, doi = {10.1088/1361-6528/ab8590}, journal-iso = {NANOTECHNOLOGY}, journal = {NANOTECHNOLOGY}, volume = {31}, unique-id = {31278305}, issn = {0957-4484}, year = {2020}, eissn = {1361-6528}, orcid-numbers = {Kónya, Zoltán/0000-0002-9406-8596} } @article{MTMT:30369384, title = {Electrical and Photoelectrical Characteristics of с-Si/Porous-Si/CdS Heterojunctions}, url = {https://m2.mtmt.hu/api/publication/30369384}, author = {Mamedov, H. M. and Kukovecz, Ákos and Kónya, Zoltán and Kordás, Krisztián and Shah, S. I. and Mamedov, V. U. and Ahmedova, Kh. M. and Mamedova, V. J. and Rzaev, R. M. and Shamilova, Sh. A. and Khanmamedova, E. A. and Agazade, L. E.}, doi = {10.1007/s11182-018-1584-2}, journal-iso = {RUSS PHYS J}, journal = {RUSSIAN PHYSICS JOURNAL}, volume = {61}, unique-id = {30369384}, issn = {1064-8887}, year = {2019}, eissn = {1573-9228}, pages = {1660-1666}, orcid-numbers = {Kukovecz, Ákos/0000-0003-0716-9557; Kónya, Zoltán/0000-0002-9406-8596} } @article{MTMT:3428263, title = {Size-dependent H2 sensing over supported Pt nanoparticles}, url = {https://m2.mtmt.hu/api/publication/3428263}, author = {Mohl, M and Dombovari, A and Szabó, Mária and Järvinen, T and Pitkänen, O and Sápi, András and Juhász, Koppány Levente and Kéri, Albert and Galbács, Gábor and Kukovecz, Ákos and Kónya, Zoltán and Kordás, Krisztián}, doi = {10.1166/jnn.2019.15787}, journal-iso = {J NANOSCI NANOTECHNO}, journal = {JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY}, volume = {19}, unique-id = {3428263}, issn = {1533-4880}, abstract = {Catalyst size affects the overall kinetics and mechanism of almost all heterogeneous chemical reactions. Since the functional sensing materials in resistive chemical sensors are practically the very same nanomaterials as the catalysts in heterogeneous chemistry, a plausible question arises: Is there any effect of the catalyst size on the sensor properties? Our study attempts to give an insight into the problem by analyzing the response and sensitivity of resistive H-2 sensors based on WO3 nanowire supported Pt nanoparticles having size of 1.5 +/- 0.4 nm, 6.2 +/- 0.8 nm, 3.7 +/- 0.5 nm and 8.3 +/- 1.3 nm. The results show that Pt nanoparticles of larger size are more active in H-2 sensing than their smaller counterparts and indicate that the detection mechanism is more complex than just considering the number of surface atoms of the catalyst.}, year = {2019}, eissn = {1533-4899}, pages = {459-464}, orcid-numbers = {Sápi, András/0000-0001-6557-0731; Kéri, Albert/0000-0001-7663-5422; Galbács, Gábor/0000-0002-1799-5329; Kukovecz, Ákos/0000-0003-0716-9557; Kónya, Zoltán/0000-0002-9406-8596} } @article{MTMT:30334201, title = {Fabrication and characterization of c-Si/porous-Si/CdS/ZnxCd1-xO heterojunctions for applications in nanostructured solar cells}, url = {https://m2.mtmt.hu/api/publication/30334201}, author = {Mamedov, Huseyn and Muradov, Mustafa and Kónya, Zoltán and Kukovecz, Ákos and Kordás, Krisztián and Shah, Syed Ismat and Mamedova, Vusala and Ahmedova, Khumar and Tagiyev, Elgun and Mamedov, Vusal}, doi = {10.4302/plp.v10i3.813}, journal-iso = {PHOTO LETT POL}, journal = {PHOTONICS LETTERS OF POLAND}, volume = {10}, unique-id = {30334201}, issn = {2080-2242}, year = {2018}, pages = {73-75}, orcid-numbers = {Kónya, Zoltán/0000-0002-9406-8596; Kukovecz, Ákos/0000-0003-0716-9557} } @article{MTMT:27330803, title = {Random networks of core-shell-like Cu-Cu2O/CuO nanowires as surface plasmon resonance-enhanced sensors}, url = {https://m2.mtmt.hu/api/publication/27330803}, author = {Hajimammadov, Rashad and Bykov, Alexander and Popov, Alexey and Juhász, Koppány Levente and Lorite, Gabriela S and Mohl, Melinda and Kukovecz, Ákos and Huuhtanen, Mika and Kordás, Krisztián}, doi = {10.1038/s41598-018-23119-6}, journal-iso = {SCI REP}, journal = {SCIENTIFIC REPORTS}, volume = {8}, unique-id = {27330803}, issn = {2045-2322}, abstract = {The rapid oxide formation on pristine unprotected copper surfaces limits the direct application of Cu nanomaterials in electronics and sensor assemblies with physical contacts. However, it is not clear whether the growing cuprous (Cu2O) and cupric oxides (CuO) and the formation of core-shell-like Cu-Cu2O/CuO nanowires would cause any compromise for non-contact optical measurements, where light absorption and subsequent charge oscillation and separation take place such as those in surface plasmon-assisted and photocatalytic processes, respectively. Therefore, we analyze how the surface potential of hydrothermally synthetized copper nanowires changes as a function of time in ambient conditions using Kelvin probe force microscopy in dark and under light illumination to reveal charge accumulation on the nanowires and on the supporting gold substrate. Further, we perform finite element modeling of the optical absorption to predict plasmonic behavior of the nanostructures. The results suggest that the core-shell-like Cu-Cu2O/CuO nanowires may be useful both in photocatalytic and in surface plasmon-enhanced processes. Here, by exploiting the latter, we show that regardless of the native surface oxide formation, random networks of the nanowires on gold substrates work as excellent amplification media for surface-enhanced Raman spectroscopy as demonstrated in sensing of Rhodamine 6G dye molecules.}, year = {2018}, eissn = {2045-2322}, orcid-numbers = {Kukovecz, Ákos/0000-0003-0716-9557} } @article{MTMT:3247084, title = {Novel, smart and RFID assisted critical temperature indicator for supply chain monitoring}, url = {https://m2.mtmt.hu/api/publication/3247084}, author = {Lorite, GS and Selkala, T and Sipola, T and Palenzuela, J and Jubete, E and Vinuales, A and Cabanero, G and Grande, HJ and Tuominen, J and Uusitalo, S and Hakalahti, L and Kordás, Krisztián and Toth, G}, doi = {10.1016/j.jfoodeng.2016.06.016}, journal-iso = {J FOOD ENG}, journal = {JOURNAL OF FOOD ENGINEERING}, volume = {193}, unique-id = {3247084}, issn = {0260-8774}, abstract = {In order to reduce food waste and meet the needs of the demanding modern consumer regarding the quality of food items, it is crucial to monitor the supply chain and storage conditions of perishable food products. Considering this scenario, temperature plays an important role on food safety and quality during storage and supply. In this work, a critical temperature indicator (CTI) based on a solvent melting point is developed. Furthermore, the present CTI working principle is improved by the use of micro fluidics technology. As final result, a novel and functional CD-smart sensor which combines irreversible visual color changes and radio frequency identification (RFID) technologies is achieved. Such CTI integrated to a RFID tag provides a unique advantage to monitor the supply chain in real time by the simple use of a RFID reader in strategic points. (C) 2016 Published by Elsevier Ltd.}, year = {2017}, eissn = {1873-5770}, pages = {20-28} } @article{MTMT:3247083, title = {Revealing the role of bromide in the H2O2 direct synthesis with the catalyst wet pretreatment method (CWPM)}, url = {https://m2.mtmt.hu/api/publication/3247083}, author = {Biasi, P and Mikkola, JP and Sterchele, S and Salmi, T and Gemo, N and Shchukarev, A and Centomo, P and Zecca, M and Canu, P and Rautio, AR and Kordás, Krisztián}, doi = {10.1002/aic.15382}, journal-iso = {AICHE J}, journal = {AICHE JOURNAL}, volume = {63}, unique-id = {3247083}, issn = {0001-1541}, abstract = {A tailor-made Pd-0/K2621 catalyst was subjected to post synthesis modification via a wet treatment procedure. The aim was the understanding of the role of promoters and howif anyimprovements could be qualitatively related to the catalyst performance for the H2O2 direct synthesis. The Catalyst Wet Pretreatment Method was applied in different methanolic solutions containing H2O2, NaBr, and H3PO4, either as single modifiers or as a mixture. The catalyst was characterized by Transmission Electron Microscopy and X-ray Photoelectron Spectroscopy. It was concluded that the modified catalysts give rise to higher selectivities compared to the pristine reference catalyst thus opening a possibility to exclude the addition of the undesirable selectivity enhancers in the reaction medium. This work provides original evidence on the role of promoters, especially bromide, allowing the formulation of a new reaction mechanism for one of the most challenging reactions recognized by the world. (c) 2016 American Institute of Chemical Engineers AIChE J, 63: 32-42, 2017}, year = {2017}, eissn = {1547-5905}, pages = {32-42} } @article{MTMT:3247082, title = {Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure}, url = {https://m2.mtmt.hu/api/publication/3247082}, author = {Wu, MC and Chen, CH and Huang, WK and Hsiao, KC and Lin, TH and Chan, SH and Wu, PY and Lu, CF and Chang, YH and Lin, TF and Hsu, KH and Hsu, JF and Lee, KM and Shyue, JJ and Kordás, Krisztián and Su, WF}, doi = {10.1038/srep40896}, journal-iso = {SCI REP}, journal = {SCIENTIFIC REPORTS}, volume = {7}, unique-id = {3247082}, issn = {2045-2322}, abstract = {Hydrogenated titanium dioxide has attracted intensive research interests in pollutant removal applications due to its high photocatalytic activity. Herein, we demonstrate hydrogenated TiO2 nanofibers (H: TiO2 NFs) with a core-shell structure prepared by the hydrothermal synthesis and subsequent heat treatment in hydrogen flow. H: TiO2 NFs has excellent solar light absorption and photogenerated charge formation behavior as confirmed by optical absorbance, photo-Kelvin force probe microscopy and photoinduced charge carrier dynamics analyses. Photodegradation of various organic dyes such as methyl orange, rhodamine 6G and brilliant green is shown to take place with significantly higher rates on our novel catalyst than on pristine TiO2 nanofibers and commercial nanoparticle based photocatalytic materials, which is attributed to surface defects (oxygen vacancy and Ti3+ interstitial defect) on the hydrogen treated surface. We propose three properties/ mechanisms responsible for the enhanced photocatalytic activity, which are: (1) improved absorbance allowing for increased exciton generation, (2) highly crystalline anatase TiO2 that promotes fast charge transport rate, and (3) decreased charge recombination caused by the nanoscopic Schottky junctions at the interface of pristine core and hydrogenated shell thus promoting long-life surface charges. The developed H: TiO2 NFs can be helpful for future high performance photocatalysts in environmental applications.}, year = {2017}, eissn = {2045-2322} }