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Nature Nanotechnology

Giulio Ragazzon, Leonard J Prins
Nature extensively exploits high-energy transient self-assembly structures that are able to perform work through a dissipative process. Often, self-assembly relies on the use of molecules as fuel that is consumed to drive thermodynamically unfavourable reactions away from equilibrium. Implementing this kind of non-equilibrium self-assembly process in synthetic systems is bound to profoundly impact the fields of chemistry, materials science and synthetic biology, leading to innovative dissipative structures able to convert and store chemical energy...
September 17, 2018: Nature Nanotechnology
Lucas Caretta, Maxwell Mann, Felix Büttner, Kohei Ueda, Bastian Pfau, Christian M Günther, Piet Hessing, Alexandra Churikova, Christopher Klose, Michael Schneider, Dieter Engel, Colin Marcus, David Bono, Kai Bagschik, Stefan Eisebitt, Geoffrey S D Beach
Spintronics is a research field that aims to understand and control spins on the nanoscale and should enable next-generation data storage and manipulation. One technological and scientific key challenge is to stabilize small spin textures and to move them efficiently with high velocities. For a long time, research focused on ferromagnetic materials, but ferromagnets show fundamental limits for speed and size. Here, we circumvent these limits using compensated ferrimagnets. Using ferrimagnetic Pt/Gd44 Co56 /TaOx films with a sizeable Dzyaloshinskii-Moriya interaction, we realize a current-driven domain wall motion with a speed of 1...
September 17, 2018: Nature Nanotechnology
Sabina Caneva, Pascal Gehring, Víctor M García-Suárez, Amador García-Fuente, Davide Stefani, Ignacio J Olavarria-Contreras, Jaime Ferrer, Cees Dekker, Herre S J van der Zant
The ability to detect and distinguish quantum interference signatures is important for both fundamental research and for the realization of devices such as electron resonators1 , interferometers2 and interference-based spin filters3 . Consistent with the principles of subwavelength optics, the wave nature of electrons can give rise to various types of interference effects4 , such as Fabry-Pérot resonances5 , Fano resonances6 and the Aharonov-Bohm effect7 . Quantum interference conductance oscillations8 have, indeed, been predicted for multiwall carbon nanotube shuttles and telescopes, and arise from atomic-scale displacements between the inner and outer tubes9,10 ...
September 17, 2018: Nature Nanotechnology
Jakob Schaab, Sandra H Skjærvø, Stephan Krohns, Xiaoyu Dai, Megan E Holtz, Andrés Cano, Martin Lilienblum, Zewu Yan, Edith Bourret, David A Muller, Manfred Fiebig, Sverre M Selbach, Dennis Meier
Domain walls in ferroelectric semiconductors show promise as multifunctional two-dimensional elements for next-generation nanotechnology. Electric fields, for example, can control the direct-current resistance and reversibly switch between insulating and conductive domain-wall states, enabling elementary electronic devices such as gates and transistors. To facilitate electrical signal processing and transformation at the domain-wall level, however, an expansion into the realm of alternating-current technology is required...
September 10, 2018: Nature Nanotechnology
Jinwoong Cha, Chiara Daraio
Nanoelectromechanical systems (NEMS) that operate in the megahertz (MHz) regime allow energy transducibility between different physical domains. For example, they convert optical or electrical signals into mechanical motions and vice versa1 . This coupling of different physical quantities leads to frequency-tunable NEMS resonators via electromechanical non-linearities2-4 . NEMS platforms with single- or low-degrees of freedom have been employed to demonstrate quantum-like effects, such as mode cooling5 , mechanically induced transparency5 , Rabi oscillation6,7 , two-mode squeezing8 and phonon lasing9 ...
September 10, 2018: Nature Nanotechnology
Qiangzhe Zhang, Diana Dehaini, Yue Zhang, Julia Zhou, Xiangyu Chen, Lifen Zhang, Ronnie H Fang, Weiwei Gao, Liangfang Zhang
Rheumatoid arthritis is a common chronic inflammatory disorder and a major cause of disability. Despite the progress made with recent clinical use of anti-cytokine biologics, the response rate of rheumatoid arthritis treatment remains unsatisfactory, owing largely to the complexity of cytokine interactions and the multiplicity of cytokine targets. Here, we show a nanoparticle-based broad-spectrum anti-inflammatory strategy for rheumatoid arthritis management. By fusing neutrophil membrane onto polymeric cores, we prepare neutrophil membrane-coated nanoparticles that inherit the antigenic exterior and associated membrane functions of the source cells, which makes them ideal decoys of neutrophil-targeted biological molecules...
September 3, 2018: Nature Nanotechnology
Bethan L Thomas, Mauro Perretti
No abstract text is available yet for this article.
September 3, 2018: Nature Nanotechnology
Michele Dipalo, Giovanni Melle, Laura Lovato, Andrea Jacassi, Francesca Santoro, Valeria Caprettini, Andrea Schirato, Alessandro Alabastri, Denis Garoli, Giulia Bruno, Francesco Tantussi, Francesco De Angelis
In the version of this Article originally published, the affiliation for the author Francesca Santoro was incorrectly given; it should have been 'Center for Advanced Biomaterials for Healthcare, Istituto Italiano di Tecnologia, Napoli, Italy'. This has now been corrected in all versions of the Article.
August 28, 2018: Nature Nanotechnology
Roya Tavallaie, Joshua McCarroll, Marion Le Grand, Nicholas Ariotti, Wolfgang Schuhmann, Eric Bakker, Richard David Tilley, David Brynn Hibbert, Maria Kavallaris, John Justin Gooding
There is intense interest in quantifying the levels of microRNA because of its importance as a blood-borne biomarker. The challenge has been to develop methods that can monitor microRNA expression both over broad concentration ranges and in ultralow amounts directly in a patient's blood. Here, we show that, through electric-field-induced reconfiguration of a network of gold-coated magnetic nanoparticles modified by probe DNA (DNA-Au@MNPs), it is possible to create a highly sensitive sensor for direct analysis of nucleic acids in samples as complex as whole blood...
August 27, 2018: Nature Nanotechnology
Peter Schmidt, Fabien Vialla, Simone Latini, Mathieu Massicotte, Klaas-Jan Tielrooij, Stefan Mastel, Gabriele Navickaite, Mark Danovich, David A Ruiz-Tijerina, Celal Yelgel, Vladimir Fal'ko, Kristian S Thygesen, Rainer Hillenbrand, Frank H L Koppens
The science and applications of electronics and optoelectronics have been driven for decades by progress in the growth of semiconducting heterostructures. Many applications in the infrared and terahertz frequency range exploit transitions between quantized states in semiconductor quantum wells (intersubband transitions). However, current quantum well devices are limited in functionality and versatility by diffusive interfaces and the requirement of lattice-matched growth conditions. Here, we introduce the concept of intersubband transitions in van der Waals quantum wells and report their first experimental observation...
August 27, 2018: Nature Nanotechnology
Son Tung Ha, Yuan Hsing Fu, Naresh Kumar Emani, Zhenying Pan, Reuben M Bakker, Ramón Paniagua-Domínguez, Arseniy I Kuznetsov
High-index dielectric and semiconductor nanoparticles supporting strong electric and magnetic resonances have drawn significant attention in recent years. However, until now, there have been no experimental reports of lasing action from such nanostructures. Here, we demonstrate directional lasing, with a low threshold and high quality factor, in active dielectric nanoantenna arrays achieved through a leaky resonance excited in coupled gallium arsenide (GaAs) nanopillars. The leaky resonance is formed by partially breaking a bound state in the continuum generated by the collective, vertical electric dipole resonances excited in the nanopillars for subdiffractive arrays...
August 20, 2018: Nature Nanotechnology
Donghee Son, Jiheong Kang, Orestis Vardoulis, Yeongin Kim, Naoji Matsuhisa, Jin Young Oh, John Wf To, Jaewan Mun, Toru Katsumata, Yuxin Liu, Allister F McGuire, Marta Krason, Francisco Molina-Lopez, Jooyeun Ham, Ulrike Kraft, Yeongjun Lee, Youngjun Yun, Jeffrey B-H Tok, Zhenan Bao
Electronic skin devices capable of monitoring physiological signals and displaying feedback information through closed-loop communication between the user and electronics are being considered for next-generation wearables and the 'Internet of Things'. Such devices need to be ultrathin to achieve seamless and conformal contact with the human body, to accommodate strains from repeated movement and to be comfortable to wear. Recently, self-healing chemistry has driven important advances in deformable and reconfigurable electronics, particularly with self-healable electrodes as the key enabler...
August 20, 2018: Nature Nanotechnology
Pasqual Rivera, Hongyi Yu, Kyle L Seyler, Nathan P Wilson, Wang Yao, Xiaodong Xu
Stacking different two-dimensional crystals into van der Waals heterostructures provides an exciting approach to designing quantum materials that can harness and extend the already fascinating properties of the constituents. Heterobilayers of transition metal dichalcogenides are particularly attractive for low-dimensional semiconductor optics because they host interlayer excitons-with electrons and holes localized in different layers-which inherit valley-contrasting physics from the monolayers and thereby possess various novel and appealing properties compared to other solid-state nanostructures...
August 13, 2018: Nature Nanotechnology
Astrid Avellan, Marie Simonin, Eric McGivney, Nathan Bossa, Eleanor Spielman-Sun, Jennifer D Rocca, Emily S Bernhardt, Nicholas K Geitner, Jason M Unrine, Mark R Wiesner, Gregory V Lowry
Predicting nanoparticle fate in aquatic environments requires mimicking of ecosystem complexity to observe the geochemical processes affecting their behaviour. Here, 12 nm Au nanoparticles were added weekly to large-scale freshwater wetland mesocosms. After six months, ~70% of Au was associated with the macrophyte Egeria densa, where, despite the thermodynamic stability of Au0 in water, the pristine Au0 nanoparticles were fully oxidized and complexed to cyanide, hydroxyls or thiol ligands. Extracted biofilms growing on E...
August 13, 2018: Nature Nanotechnology
John A Tomko, Abdon Pena-Francesch, Huihun Jung, Madhusudan Tyagi, Benjamin D Allen, Melik C Demirel, Patrick E Hopkins
The dynamic control of thermal transport properties in solids must contend with the fact that phonons are inherently broadband. Thus, efforts to create reversible thermal conductivity switches have resulted in only modest on/off ratios, since only a relatively narrow portion of the phononic spectrum is impacted. Here, we report on the ability to modulate the thermal conductivity of topologically networked materials by nearly a factor of four following hydration, through manipulation of the displacement amplitude of atomic vibrations...
August 13, 2018: Nature Nanotechnology
Suji Choi, Sang Ihn Han, Dongjun Jung, Hye Jin Hwang, Chaehong Lim, Soochan Bae, Ok Kyu Park, Cory M Tschabrunn, Mincheol Lee, Sun Youn Bae, Ji Woong Yu, Ji Ho Ryu, Sang-Woo Lee, Kyungpyo Park, Peter M Kang, Won Bo Lee, Reza Nezafat, Taeghwan Hyeon, Dae-Hyeong Kim
Wearable and implantable devices require conductive, stretchable and biocompatible materials. However, obtaining composites that simultaneously fulfil these requirements is challenging due to a trade-off between conductivity and stretchability. Here, we report on Ag-Au nanocomposites composed of ultralong gold-coated silver nanowires in an elastomeric block-copolymer matrix. Owing to the high aspect ratio and percolation network of the Ag-Au nanowires, the nanocomposites exhibit an optimized conductivity of 41,850 S cm-1 (maximum of 72,600 S cm-1 )...
August 13, 2018: Nature Nanotechnology
Michele Dipalo, Giovanni Melle, Laura Lovato, Andrea Jacassi, Francesca Santoro, Valeria Caprettini, Andrea Schirato, Alessandro Alabastri, Denis Garoli, Giulia Bruno, Francesco Tantussi, Francesco De Angelis
The ability to monitor electrogenic cells accurately plays a pivotal role in neuroscience, cardiology and cell biology. Despite pioneering research and long-lasting efforts, the existing methods for intracellular recording of action potentials on the large network scale suffer limitations that prevent their widespread use. Here, we introduce the concept of a meta-electrode, a planar porous electrode that mimics the optical and biological behaviour of three-dimensional plasmonic antennas but also preserves the ability to work as an electrode...
August 13, 2018: Nature Nanotechnology
Ramya Parameswaran, Bozhi Tian
No abstract text is available yet for this article.
August 13, 2018: Nature Nanotechnology
Fábio Barachati, Antonio Fieramosca, Soroush Hafezian, Jie Gu, Biswanath Chakraborty, Dario Ballarini, Ludvik Martinu, Vinod Menon, Daniele Sanvitto, Stéphane Kéna-Cohen
Atomically thin transition metal dichalcogenides (TMDs) possess a number of properties that make them attractive for realizing room-temperature polariton devices1 . An ideal platform for manipulating polariton fluids within monolayer TMDs is that of Bloch surface waves, which confine the electric field to a small volume near the surface of a dielectric mirror2-4 . Here we demonstrate that monolayer tungsten disulfide can sustain Bloch surface wave polaritons (BSWPs) with a Rabi splitting of 43 meV and propagation lengths reaching 33 μm...
August 6, 2018: Nature Nanotechnology
Jean-Claude G Bünzli
No abstract text is available yet for this article.
August 6, 2018: Nature Nanotechnology
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