A perspective on the electrochemical oxidation of methane to methanol in membrane electrode assemblies Julie C. Fornaciari, Darinka Primc, Kenta Kawashima, Bryan R. Wygant, Sumit Verma, et al. ACS Energy Letters, 2020 Direct conversion of methane to methanol has been a long-sought objective. Partial oxidation by thermal catalysis is possible but suffers from a rapid loss in methanol selectivity with increasing m...
Single Nanoparticle Magnetic Spin Memristor Hammam Al-Bustami, Guy Koplovitz, Darinka Primc, Shira Yochelis, Eyal Capua, et al. Small, 2018 There is an increasing demand for the development of a simple Si-based universal memory device at the nanoscale that operates at high frequencies. Spin-electronics (spintronics) can, in principle, increase the efficiency of devices and allow them to operate at high frequencies. A primary challenge for reducing the dimensions of spintronic devices is the requirement for high spin currents. To overcome this problem, a new approach is presented that uses helical chiral molecules exhibiting spin-selective electron transport, which is called the chiral-induced spin selectivity (CISS) effect. Using the CISS effect, the active memory device is miniaturized for the first time from the micrometer scale to 30 nm in size, and this device presents memristor-like nonlinear logic operation at low voltages under ambient conditions and room temperature. A single nanoparticle, along with Au contacts and chiral molecules, is sufficient to function as a memory device. A single ferromagnetic nanoplatelet is used as a fixed hard magnet combined with Au contacts in which the gold contacts act as soft magnets due to the adsorbed chiral molecules.
Synthesis and Formation Mechanism of Multicomponent Sb-Nb:TiO2 Mesocrystals Darinka Primc, Markus Niederberger Chemistry of Materials, 2017 The synthesis of multicomponent mesocrystals represents an emerging strategy for obtaining nanomaterials with unique functionalities as a result of combining porosity and crystallographic order. This study presents the first synthesis of multicomponent Sb–Nb:TiO2 mesocrystals (Sb-mesoNb/TO) by using a microwave-assisted nonaqueous sol–gel method. Structural and chemical analyses, carried out using various transmission electron microscopy techniques, show that Sb-mesoNb/TO are 25–35 nm in size and composed of crystallographically aligned Nb:TiO2 subunits, embedded in a porous amorphous Sb-rich scaffold (Sb-scaffold). On the basis of the characterization of the intermediate products, the formation mechanism is proposed, involving a kinetically controlled particle-based assembly process. The latter is triggered by the occurrence of the Sb-scaffold in the early reaction stages, acting as a support for heterogeneous nucleation of Nb:TiO2 subunits. Subsequently, Nb:TiO2 subunits grow and assemble in a mutual cr...
Magnetic Nanoplatelet-Based Spin Memory Device Operating at Ambient Temperatures Guy Koplovitz, Darinka Primc, Oren Ben Dor, Shira Yochelis, Dvir Rotem, et al. Advanced Materials, 2017 There is an increasing demand for realizing a simple Si based universal memory device working at ambient temperatures. In principle, nonvolatile magnetic memory can operate at low power consumption and high frequencies. However, in order to compete with existing memory technology, size reduction and simplification of the used material systems are essential. In this work, the chiral‐induced spin selectivity effect is used along with 30–50 nm ferromagnetic nanoplatelets in order to realize a simple magnetic memory device. The vertical memory is Si compatible, easy to fabricate, and in principle can be scaled down to a single nanoparticle size. Results show clear dual magnetization behavior with threefold enhancement between the one and zero states. The magnetization of the device is accompanied with large avalanche like noise that is ascribed to the redistribution of current densities due to spin accumulation inducing coupling effects between the different nanoplatelets.
Chemical Substitution - Alignment of the Surface Potentials for Efficient Charge Transport in Nanocrystalline TiO2 Photocatalysts Darinka Primc, Guobo Zeng, Richard Leute, Michael Walter, Leonhard Mayrhofer, et al. Chemistry of Materials, 2016 Anatase TiO2 is among the most studied photocatalytic materials for solar energy conversion and environmental cleanup. However, its poor visible light absorption and high facet-dependent performance limits its utilization. In this study chemical substitution (doping) of TiO2 nanoparticles with metal ions (Sb, Cr, or Sb/Nb and Cr/Nb) is presented as an alternative strategy to address both issues simultaneously. Highly crystalline doped and codoped TiO2 nanoparticles were successfully synthesized by a microwave-assisted nonaqueous sol–gel synthesis. The structural and compositional analysis done by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS) showed that depending on the doping applied, variations in particles size and morphology were observed. Doped and codoped samples showed improved absorption in the visible range and in comparison to the undoped TiO2 displayed improved photocatalytic (PC) activity. The variations of the PC ...
Size-Dependent Luminescence in HfO2 Nanocrystals: Toward White Emission from Intrinsic Surface Defects Irene Villa, Anna Vedda, Mauro Fasoli, Roberto Lorenzi, Niklaus Kränzlin, et al. Chemistry of Materials, 2016 Defect engineering operated on metal oxides by chemical and structural modifications may strongly affect properties suitable for various applications such as photoelectrochemical behavior, charge transport, and luminescence. In this work, we report the tunable optical features observed in undoped monoclinic HfO2 nanocrystals and their dependence on the structural properties of the material at the nanoscale. Transmission electron microscopy together with X-ray diffraction and surface area measurements were used to determine the fine structural modifications, in terms of crystal growth and coalescence of crystalline domains, occurring during a calcination process in the temperature range from 400 to 1000 °C. The fit of the broad optical emission into spectral components, together with time-resolved photoluminescence, allowed us to identify the dual nature of the emission at 2.5 eV, where an ultrafast defect-related intrinsic luminescence (with a decay time of a few nanoseconds) overlaps with a slower emissi...
Multiscale anode materials in lithium ion batteries by combining micro-with nanoparticles: Design of mesoporous TiO2 microfibers@nitrogen doped carbon composites Wei Cheng, Felix Rechberger, Darinka Primc, Markus Niederberger Nanoscale, 2015 TiO2 has been considered as a promising anode material for lithium ion batteries. However, its poor rate capability originating from the intrinsically low lithium ion diffusivity and its poor electronic conductivity hampers putting such an application into practice. Both issues can be addressed by nanostructure engineering and conductive surface coating. Herein, we report a template-assisted synthesis of micron sized TiO2 fibers consisting of a mesoporous network of anatase nanoparticles of about 7.5 nm and coated by N doped carbon. In a first step, an amorphous layer of TiO2 was deposited on cobalt silicate nanobelts and subsequently transformed into crystalline anatase nanoparticles by hydrothermal treatment. The N doped carbon coating was realized by in situ polymerization of dopamine on the crystalline TiO2 followed by annealing under N2. After removal of the template, we obtained the final mesoporous TiO2 fibers@N doped carbon composite. Electrochemical tests revealed that the composite electrode exhibited excellent electrochemical properties in terms of specific capacity, rate performance and long term stability.
Synthesis of Cu 3 N and Cu 3 N–Cu 2 O multicomponent mesocrystals: Non-classical crystallization and nanoscale Kirkendall effect D Primc, L Indrizzi, E Tervoort, F Xie, M Niederberger Nanoscale 13 (41), 17521-17529 , 2021 2021 Citations: 6
A perspective on the electrochemical oxidation of methane to methanol in membrane electrode assemblies JC Fornaciari, D Primc, K Kawashima, BR Wygant, S Verma, L Spanu, ... ACS Energy Letters 5 (9), 2954-2963 , 2020 2020 Citations: 76
Design of single-site transition metal catalysts for electrochemical oxidation of methane to methanol D Primc, J Fornaciari, A Weber, A Bell ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 258 , 2019 2019
Electrocatalyst Performance for Selective Methanol Formation in Methane Electrolyzer J Fornaciari, D Primc, AZ Weber, AT Bell Electrochemical Society Meeting Abstracts aimes2018, 1552-1552 , 2018 2018
Design and Activity of Supported Transition Metal Catalysts for Methane to Methanol Oxidation in Electrochemical Fuel Cell D Primc, J Fornaciari, AZ Weber, AT Bell Electrochemical Society Meeting Abstracts aimes2018, 1577-1577 , 2018 2018
Single nanoparticle magnetic spin memristor H Al‐Bustami, G Koplovitz, D Primc, S Yochelis, E Capua, D Porath, ... Small 14 (30), 1801249 , 2018 2018 Citations: 119
Synthesis and Formation Mechanism of Multicomponent Sb–Nb:TiO 2 Mesocrystals D Primc, M Niederberger Chemistry of Materials 29 (23), 10113-10121 , 2017 2017 Citations: 13
Magnetic nanoplatelet‐based spin memory device operating at ambient temperatures G Koplovitz, D Primc, O Ben Dor, S Yochelis, D Rotem, D Porath, Y Paltiel Advanced Materials 29 (17), 1606748 , 2017 2017 Citations: 79
Doping of TiO 2 as a tool to optimize the water splitting efficiencies of titania–hematite photoanodes D Primc, M Bärtsch, D Barreca, G Carraro, C Maccato, C Sada, ... Sustainable Energy & Fuels 1 (1), 199-206 , 2017 2017 Citations: 26
Chemical Substitution - Alignment of the Surface Potentials for Efficient Charge Transport in Nanocrystalline TiO 2 Photocatalysts D Primc, G Zeng, R Leute, M Walter, L Mayrhofer, M Niederberger Chemistry of Materials 28 (12), 4223-4230 , 2016 2016 Citations: 33
Size-Dependent Luminescence in HfO 2 Nanocrystals: Toward White Emission from Intrinsic Surface Defects I Villa, A Vedda, M Fasoli, R Lorenzi, N Kränzlin, F Rechberger, G Ilari, ... Chemistry of Materials 28 (10), 3245-3253 , 2016 2016 Citations: 64
Synthesis of composite nanoparticles using co-precipitation of a magnetic iron-oxide shell onto core nanoparticles D Primc, B Belec, D Makovec Journal of Nanoparticle Research 18 (3), 64 , 2016 2016 Citations: 30
The formation of magnetic carboxymethyl-dextrane-coated iron-oxide nanoparticles using precipitation from an aqueous solution D Makovec, S Gyergyek, D Primc, I Plantan Materials Chemistry and Physics 153, 376-383 , 2015 2015 Citations: 10
Large‐area alignment of tungsten oxide nanowires over flat and patterned substrates for room‐temperature gas sensing W Cheng, Y Ju, P Payamyar, D Primc, J Rao, C Willa, D Koziej, ... Angewandte Chemie International Edition 54 (1), 340-344 , 2015 2015 Citations: 134
Großflächige Anordnung von Wolframoxidnanodrähten auf ebenen und strukturierten Substraten für Gassensorik bei Raumtemperatur W Cheng, Y Ju, P Payamyar, D Primc, J Rao, C Willa, D Koziej, ... Angewandte Chemie 127 (1), 347-351 , 2015 2015 Citations: 6
Multiscale anode materials in lithium ion batteries by combining micro-with nanoparticles: design of mesoporous TiO 2 microfibers@ nitrogen doped carbon composites W Cheng, F Rechberger, D Primc, M Niederberger Nanoscale 7 (33), 13898-13906 , 2015 2015 Citations: 23
Composite nanoplatelets combining soft-magnetic iron oxide with hard-magnetic barium hexaferrite D Primc, D Makovec Nanoscale 7 (6), 2688-2697 , 2015 2015 Citations: 42
Direct solvothermal preparation of nanostructured fluoride aerogels based on AlF 3 A Štefančič, D Primc, G Tavčar, T Skapin Dalton Transactions 44 (47), 20609-20617 , 2015 2015 Citations: 9
Modified self-propagating high-temperature synthesis of nanosized La0. 7Ca0. 3MnO3 A Mraković, J Blanuša, D Primc, M Perović, Z Jagličić, V Kusigerski, ... Ceramics International 39 (4), 3771-3777 , 2013 2013 Citations: 25
Structural properties of ultrafine Ba-hexaferrite nanoparticles D Makovec, D Primc, S Šturm, A Kodre, D Hanžel, M Drofenik Journal of Solid State Chemistry 196, 63-71 , 2012 2012 Citations: 60
MOST CITED SCHOLAR PUBLICATIONS
Large‐area alignment of tungsten oxide nanowires over flat and patterned substrates for room‐temperature gas sensing W Cheng, Y Ju, P Payamyar, D Primc, J Rao, C Willa, D Koziej, ... Angewandte Chemie International Edition 54 (1), 340-344 , 2015 2015 Citations: 134
Hydrothermal synthesis of ultrafine barium hexaferrite nanoparticles and the preparation of their stable suspensions D Primc, D Makovec, D Lisjak, M Drofenik Nanotechnology 20 (31), 315605 , 2009 2009 Citations: 132
Single nanoparticle magnetic spin memristor H Al‐Bustami, G Koplovitz, D Primc, S Yochelis, E Capua, D Porath, ... Small 14 (30), 1801249 , 2018 2018 Citations: 119
Magnetic nanoplatelet‐based spin memory device operating at ambient temperatures G Koplovitz, D Primc, O Ben Dor, S Yochelis, D Rotem, D Porath, Y Paltiel Advanced Materials 29 (17), 1606748 , 2017 2017 Citations: 79
A perspective on the electrochemical oxidation of methane to methanol in membrane electrode assemblies JC Fornaciari, D Primc, K Kawashima, BR Wygant, S Verma, L Spanu, ... ACS Energy Letters 5 (9), 2954-2963 , 2020 2020 Citations: 76
Size-Dependent Luminescence in HfO 2 Nanocrystals: Toward White Emission from Intrinsic Surface Defects I Villa, A Vedda, M Fasoli, R Lorenzi, N Kränzlin, F Rechberger, G Ilari, ... Chemistry of Materials 28 (10), 3245-3253 , 2016 2016 Citations: 64
Structural properties of ultrafine Ba-hexaferrite nanoparticles D Makovec, D Primc, S Šturm, A Kodre, D Hanžel, M Drofenik Journal of Solid State Chemistry 196, 63-71 , 2012 2012 Citations: 60
Composite nanoplatelets combining soft-magnetic iron oxide with hard-magnetic barium hexaferrite D Primc, D Makovec Nanoscale 7 (6), 2688-2697 , 2015 2015 Citations: 42
Low‐Temperature Hydrothermal Synthesis of Ultrafine Strontium Hexaferrite Nanoparticles D Primc, M Drofenik, D Makovec European Journal of Inorganic Chemistry 2011 (25), 3802-3809 , 2011 2011 Citations: 37
Chemical Substitution - Alignment of the Surface Potentials for Efficient Charge Transport in Nanocrystalline TiO 2 Photocatalysts D Primc, G Zeng, R Leute, M Walter, L Mayrhofer, M Niederberger Chemistry of Materials 28 (12), 4223-4230 , 2016 2016 Citations: 33
Synthesis of composite nanoparticles using co-precipitation of a magnetic iron-oxide shell onto core nanoparticles D Primc, B Belec, D Makovec Journal of Nanoparticle Research 18 (3), 64 , 2016 2016 Citations: 30
Doping of TiO 2 as a tool to optimize the water splitting efficiencies of titania–hematite photoanodes D Primc, M Bärtsch, D Barreca, G Carraro, C Maccato, C Sada, ... Sustainable Energy & Fuels 1 (1), 199-206 , 2017 2017 Citations: 26
Modified self-propagating high-temperature synthesis of nanosized La0. 7Ca0. 3MnO3 A Mraković, J Blanuša, D Primc, M Perović, Z Jagličić, V Kusigerski, ... Ceramics International 39 (4), 3771-3777 , 2013 2013 Citations: 25
Multiscale anode materials in lithium ion batteries by combining micro-with nanoparticles: design of mesoporous TiO 2 microfibers@ nitrogen doped carbon composites W Cheng, F Rechberger, D Primc, M Niederberger Nanoscale 7 (33), 13898-13906 , 2015 2015 Citations: 23
Synthesis and Formation Mechanism of Multicomponent Sb–Nb:TiO 2 Mesocrystals D Primc, M Niederberger Chemistry of Materials 29 (23), 10113-10121 , 2017 2017 Citations: 13
The formation of magnetic carboxymethyl-dextrane-coated iron-oxide nanoparticles using precipitation from an aqueous solution D Makovec, S Gyergyek, D Primc, I Plantan Materials Chemistry and Physics 153, 376-383 , 2015 2015 Citations: 10
Direct solvothermal preparation of nanostructured fluoride aerogels based on AlF 3 A Štefančič, D Primc, G Tavčar, T Skapin Dalton Transactions 44 (47), 20609-20617 , 2015 2015 Citations: 9
Synthesis of Cu 3 N and Cu 3 N–Cu 2 O multicomponent mesocrystals: Non-classical crystallization and nanoscale Kirkendall effect D Primc, L Indrizzi, E Tervoort, F Xie, M Niederberger Nanoscale 13 (41), 17521-17529 , 2021 2021 Citations: 6
Großflächige Anordnung von Wolframoxidnanodrähten auf ebenen und strukturierten Substraten für Gassensorik bei Raumtemperatur W Cheng, Y Ju, P Payamyar, D Primc, J Rao, C Willa, D Koziej, ... Angewandte Chemie 127 (1), 347-351 , 2015 2015 Citations: 6
Design of single-site transition metal catalysts for electrochemical oxidation of methane to methanol D Primc, J Fornaciari, A Weber, A Bell ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 258 , 2019 2019