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Unravelling the Elusive Antiferromagnetic Order in Wurtzite and Zinc Blende CoO Polymorph Nanoparticles 下载免费PDF全文
Alejandro G. Roca Igor V. Golosovsky Elin Winkler Alberto López‐Ortega Roberto D. Zysler María Dolors Baró Josep Nogués 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(15)
Although cubic rock salt‐CoO has been extensively studied, the magnetic properties of the main nanoscale CoO polymorphs (hexagonal wurtzite and cubic zinc blende structures) are rather poorly understood. Here, a detailed magnetic and neutron diffraction study on zinc blende and wurtzite CoO nanoparticles is presented. The zinc blende‐CoO phase is antiferromagnetic with a 3rd type structure in a face‐centered cubic lattice and a Néel temperature of TN (zinc‐blende) ≈225 K. Wurtzite‐CoO also presents an antiferromagnetic order, TN (wurtzite) ≈109 K, although much more complex, with a 2nd type order along the c‐axis but an incommensurate order along the y‐axis. Importantly, the overall magnetic properties are overwhelmed by the uncompensated spins, which confer the system a ferromagnetic‐like behavior even at room temperature. 相似文献
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Nathan G. Brady Shamus L. O'Leary Garrett C. Moormann Manish K. Singh John Watt George D. Bachand 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(15):2370101
Filamentous fungi can synthesize a variety of nanoparticles (NPs), a process referred to as mycosynthesis that requires little energy input, do not require the use of harsh chemicals, occurs at near neutral pH, and do not produce toxic byproducts. While NP synthesis involves reactions between metal ions and exudates produced by the fungi, the chemical and biochemical parameters underlying this process remain poorly understood. Here, the role of fungal species and precursor salt on the mycosynthesis of zinc oxide (ZnO) NPs is investigated. This data demonstrates that all five fungal species tested are able to produce ZnO structures that can be morphologically classified into i) well-defined NPs, ii) coalesced/dissolving NPs, and iii) micron-sized square plates. Further, species-dependent preferences for these morphologies are observed, suggesting potential differences in the profile or concentration of the biochemical constituents in their individual exudates. This data also demonstrates that mycosynthesis of ZnO NPs is independent of the anion species, with nitrate, sulfate, and chloride showing no effect on NP production. These results enhance the understanding of factors controlling the mycosynthesis of ceramic NPs, supporting future studies that can enable control over the physical and chemical properties of NPs formed through this “green” synthesis method. 相似文献
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Oxidative Stress Imaging: Visualizing Oxidative Cellular Stress Induced by Nanoparticles in the Subcytotoxic Range Using Fluorescence Lifetime Imaging (Small 23/2018) 下载免费PDF全文
Jens Balke Pierre Volz Falko Neumann Robert Brodwolf Alexander Wolf Hannah Pischon Moritz Radbruch Lars Mundhenk Achim D. Gruber Nan Ma Ulrike Alexiev 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(23)
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Ultrasonication: Formation of Metal Nanoparticles Directly from Bulk Sources Using Ultrasound and Application to E‐Waste Upcycling (Small 17/2018) 下载免费PDF全文
John Watt Mariah J. Austin Chester K. Simocko Douglas V. Pete Jonathan Chavez Lauren M. Ammerman Dale L. Huber 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(17)
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Molecular Devices: Shaping the Atomic‐Scale Geometries of Electrodes to Control Optical and Electrical Performance of Molecular Devices (Small 15/2018) 下载免费PDF全文
Zhikai Zhao Ran Liu Dirk Mayer Maristella Coppola Lu Sun Youngsang Kim Chuankui Wang Lifa Ni Xing Chen Maoning Wang Zongliang Li Takhee Lee Dong Xiang 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(15)
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Precision Plasmonics: Ideal Dimers of Gold Nanospheres for Precision Plasmonics: Synthesis and Characterization at the Single‐Particle Level for Identification of Higher Order Modes (Small 4/2018) 下载免费PDF全文
Jun Hee Yoon Florian Selbach Ludmilla Langolf Sebastian Schlücker 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(4)
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Transistors: Chemically Functionalized,Well‐Dispersed Carbon Nanotubes in Lithium‐Doped Zinc Oxide for Low‐Cost,High‐Performance Thin‐Film Transistors (Small 14/2016) 下载免费PDF全文
Gi‐Cheol Son Sang‐Soo Chee Ji‐Hyun Jun Myungwoo Son Sun Sook Lee Youngmin Choi Sunho Jeong Moon‐Ho Ham 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(14):1960-1960