TY - JOUR AU - Zhou, Jin AU - Bagheri, Mohammad AU - Järvinen, Topias AU - Bartus Pravda, Cora AU - Kukovecz, Ákos AU - Komsa, Hannu-Pekka AU - Kordás, Krisztián TI - C 60 Br 24 /SWCNT: A Highly Sensitive Medium to Detect H 2 S via Inhomogeneous Carrier Doping JF - ACS APPLIED MATERIALS & INTERFACES J2 - ACS APPL MATER INTER VL - 13 PY - 2021 IS - 49 SP - 59067 EP - 59075 PG - 9 SN - 1944-8244 DO - 10.1021/acsami.1c16807 UR - https://m2.mtmt.hu/api/publication/32539659 ID - 32539659 LA - English DB - MTMT ER - TY - JOUR AU - Zhou, Jin AU - Jarvinen, Topias AU - Pitkänen, Olli AU - Kónya, Zoltán AU - Kukovecz, Ákos AU - Kordás, Krisztián TI - Composites of ion-in-conjugation polysquaraine and SWCNTs for the detection of H 2 S and NH 3 at ppb concentrations JF - NANOTECHNOLOGY J2 - NANOTECHNOLOGY VL - 32 PY - 2021 IS - 18 PG - 10 SN - 0957-4484 DO - 10.1088/1361-6528/abdf06 UR - https://m2.mtmt.hu/api/publication/31827360 ID - 31827360 LA - English DB - MTMT ER - TY - JOUR AU - Valasma, Ronja AU - Bozo, Eva AU - Pitkänen, Olli AU - Jarvinen, Topias AU - Dombovari, Aron AU - Mohl, Melinda AU - Lorite, Gabriela S AU - Kiss, János AU - Kónya, Zoltán AU - Kordás, Krisztián TI - Grid-type transparent conductive thin films of carbon nanotubes as capacitive touch sensors JF - NANOTECHNOLOGY J2 - NANOTECHNOLOGY VL - 31 PY - 2020 IS - 30 PG - 7 SN - 0957-4484 DO - 10.1088/1361-6528/ab8590 UR - https://m2.mtmt.hu/api/publication/31278305 ID - 31278305 LA - English DB - MTMT ER - TY - JOUR AU - Mamedov, H. M. AU - Kukovecz, Ákos AU - Kónya, Zoltán AU - Kordás, Krisztián AU - Shah, S. I. AU - Mamedov, V. U. AU - Ahmedova, Kh. M. AU - Mamedova, V. J. AU - Rzaev, R. M. AU - Shamilova, Sh. A. AU - Khanmamedova, E. A. AU - Agazade, L. E. TI - Electrical and Photoelectrical Characteristics of с-Si/Porous-Si/CdS Heterojunctions JF - RUSSIAN PHYSICS JOURNAL J2 - RUSS PHYS J VL - 61 PY - 2019 IS - 9 SP - 1660 EP - 1666 PG - 7 SN - 1064-8887 DO - 10.1007/s11182-018-1584-2 UR - https://m2.mtmt.hu/api/publication/30369384 ID - 30369384 LA - English DB - MTMT ER - TY - JOUR AU - Mohl, M AU - Dombovari, A AU - Szabó, Mária AU - Järvinen, T AU - Pitkänen, O AU - Sápi, András AU - Juhász, Koppány Levente AU - Kéri, Albert AU - Galbács, Gábor AU - Kukovecz, Ákos AU - Kónya, Zoltán AU - Kordás, Krisztián TI - Size-dependent H2 sensing over supported Pt nanoparticles JF - JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY J2 - J NANOSCI NANOTECHNO VL - 19 PY - 2019 IS - 1 SP - 459 EP - 464 PG - 6 SN - 1533-4880 DO - 10.1166/jnn.2019.15787 UR - https://m2.mtmt.hu/api/publication/3428263 ID - 3428263 AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Mamedov, Huseyn AU - Muradov, Mustafa AU - Kónya, Zoltán AU - Kukovecz, Ákos AU - Kordás, Krisztián AU - Shah, Syed Ismat AU - Mamedova, Vusala AU - Ahmedova, Khumar AU - Tagiyev, Elgun AU - Mamedov, Vusal TI - Fabrication and characterization of c-Si/porous-Si/CdS/ZnxCd1-xO heterojunctions for applications in nanostructured solar cells JF - PHOTONICS LETTERS OF POLAND J2 - PHOTO LETT POL VL - 10 ET - 0 PY - 2018 IS - 3 SP - 73 EP - 75 PG - 3 SN - 2080-2242 DO - 10.4302/plp.v10i3.813 UR - https://m2.mtmt.hu/api/publication/30334201 ID - 30334201 LA - English DB - MTMT ER - TY - JOUR AU - Hajimammadov, Rashad AU - Bykov, Alexander AU - Popov, Alexey AU - Juhász, Koppány Levente AU - Lorite, Gabriela S AU - Mohl, Melinda AU - Kukovecz, Ákos AU - Huuhtanen, Mika AU - Kordás, Krisztián TI - Random networks of core-shell-like Cu-Cu2O/CuO nanowires as surface plasmon resonance-enhanced sensors JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 8 PY - 2018 IS - 1 PG - 8 SN - 2045-2322 DO - 10.1038/s41598-018-23119-6 UR - https://m2.mtmt.hu/api/publication/27330803 ID - 27330803 AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Lorite, GS AU - Selkala, T AU - Sipola, T AU - Palenzuela, J AU - Jubete, E AU - Vinuales, A AU - Cabanero, G AU - Grande, HJ AU - Tuominen, J AU - Uusitalo, S AU - Hakalahti, L AU - Kordás, Krisztián AU - Toth, G TI - Novel, smart and RFID assisted critical temperature indicator for supply chain monitoring JF - JOURNAL OF FOOD ENGINEERING J2 - J FOOD ENG VL - 193 PY - 2017 SP - 20 EP - 28 PG - 9 SN - 0260-8774 DO - 10.1016/j.jfoodeng.2016.06.016 UR - https://m2.mtmt.hu/api/publication/3247084 ID - 3247084 N1 - : Sanna/0000-0001-7224-1557; Sipola, Teemu/0000-0002-8056-4097 AB - 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. LA - English DB - MTMT ER - TY - JOUR AU - Biasi, P AU - Mikkola, JP AU - Sterchele, S AU - Salmi, T AU - Gemo, N AU - Shchukarev, A AU - Centomo, P AU - Zecca, M AU - Canu, P AU - Rautio, AR AU - Kordás, Krisztián TI - Revealing the role of bromide in the H2O2 direct synthesis with the catalyst wet pretreatment method (CWPM) JF - AICHE JOURNAL J2 - AICHE J VL - 63 PY - 2017 IS - 1 SP - 32 EP - 42 PG - 11 SN - 0001-1541 DO - 10.1002/aic.15382 UR - https://m2.mtmt.hu/api/publication/3247083 ID - 3247083 N1 - : Pierdomenico/0000-0002-4188-5664 Hiányzó ország: 'MN' AB - 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 LA - English DB - MTMT ER - TY - JOUR AU - Wu, MC AU - Chen, CH AU - Huang, WK AU - Hsiao, KC AU - Lin, TH AU - Chan, SH AU - Wu, PY AU - Lu, CF AU - Chang, YH AU - Lin, TF AU - Hsu, KH AU - Hsu, JF AU - Lee, KM AU - Shyue, JJ AU - Kordás, Krisztián AU - Su, WF TI - Improved Solar-Driven Photocatalytic Performance of Highly Crystalline Hydrogenated TiO2 Nanofibers with Core-Shell Structure JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 7 PY - 2017 PG - 12 SN - 2045-2322 DO - 10.1038/srep40896 UR - https://m2.mtmt.hu/api/publication/3247082 ID - 3247082 N1 - : Krisztian/E-7654-2015; Su, Wei-Fang/C-2646-2009 WoS:hiba:000392179100001 2020-08-31 02:17 cikkazonosító nem egyezik AB - 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. LA - English DB - MTMT ER -