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Nature Nanotechnology

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https://www.readbyqxmd.com/read/28920965/conformation-based-signal-transfer-and-processing-at-the-single-molecule-level
#1
Chao Li, Zhongping Wang, Yan Lu, Xiaoqing Liu, Li Wang
Building electronic components made of individual molecules is a promising strategy for the miniaturization and integration of electronic devices. However, the practical realization of molecular devices and circuits for signal transmission and processing at room temperature has proven challenging. Here, we present room-temperature intermolecular signal transfer and processing using SnCl2Pc molecules on a Cu(100) surface. The in-plane orientations of the molecules are effectively coupled via intermolecular interaction and serve as the information carrier...
September 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28920964/directed-emission-of-cdse-nanoplatelets-originating-from-strongly-anisotropic-2d-electronic-structure
#2
Riccardo Scott, Jan Heckmann, Anatol V Prudnikau, Artsiom Antanovich, Aleksandr Mikhailov, Nina Owschimikow, Mikhail Artemyev, Juan I Climente, Ulrike Woggon, Nicolai B Grosse, Alexander W Achtstein
Intrinsically directional light emitters are potentially important for applications in photonics including lasing and energy-efficient display technology. Here, we propose a new route to overcome intrinsic efficiency limitations in light-emitting devices by studying a CdSe nanoplatelets monolayer that exhibits strongly anisotropic, directed photoluminescence. Analysis of the two-dimensional k-space distribution reveals the underlying internal transition dipole distribution. The observed directed emission is related to the anisotropy of the electronic Bloch states governing the exciton transition dipole moment and forming a bright plane...
September 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28920963/tuning-a-circular-p-n-junction-in-graphene-from-quantum-confinement-to-optical-guiding
#3
Yuhang Jiang, Jinhai Mao, Dean Moldovan, Massoud Ramezani Masir, Guohong Li, Kenji Watanabe, Takashi Taniguchi, Francois M Peeters, Eva Y Andrei
The photon-like propagation of the Dirac electrons in graphene, together with its record-high electronic mobility, can lead to applications based on ultrafast electronic response and low dissipation. However, the chiral nature of the charge carriers that is responsible for the high mobility also makes it difficult to control their motion and prevents electronic switching. Here, we show how to manipulate the charge carriers by using a circular p-n junction whose size can be continuously tuned from the nanometre to the micrometre scale...
September 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28920962/coplanar-semiconductor-metal-circuitry-defined-on-few-layer-mote2-via-polymorphic-heteroepitaxy
#4
Ji Ho Sung, Hoseok Heo, Saerom Si, Yong Hyeon Kim, Hyeong Rae Noh, Kyung Song, Juho Kim, Chang-Soo Lee, Seung-Young Seo, Dong-Hwi Kim, Hyoung Kug Kim, Han Woong Yeom, Tae-Hwan Kim, Si-Young Choi, Jun Sung Kim, Moon-Ho Jo
Crystal polymorphism selectively stabilizes the electronic phase of atomically thin transition-metal dichalcogenides (TMDCs) as metallic or semiconducting, suggesting the potential to integrate these polymorphs as circuit components in two-dimensional electronic circuitry. Developing a selective and sequential growth strategy for such two-dimensional polymorphs in the vapour phase is a critical step in this endeavour. Here, we report on the polymorphic integration of distinct metallic (1T') and semiconducting (2H) MoTe2 crystals within the same atomic planes by heteroepitaxy...
September 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28892103/internet-of-things-sensing-without-power
#5
Vladimir A Aksyuk
No abstract text is available yet for this article.
September 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28892102/length-independent-dna-packing-into-nanopore-zero-mode-waveguides-for-low-input-dna-sequencing
#6
Joseph Larkin, Robert Y Henley, Vivek Jadhav, Jonas Korlach, Meni Wanunu
Compared with conventional methods, single-molecule real-time (SMRT) DNA sequencing exhibits longer read lengths than conventional methods, less GC bias, and the ability to read DNA base modifications. However, reading DNA sequence from sub-nanogram quantities is impractical owing to inefficient delivery of DNA molecules into the confines of zero-mode waveguides-zeptolitre optical cavities in which DNA sequencing proceeds. Here, we show that the efficiency of voltage-induced DNA loading into waveguides equipped with nanopores at their floors is five orders of magnitude greater than existing methods...
September 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28892101/zero-power-infrared-digitizers-based-on-plasmonically-enhanced-micromechanical-photoswitches
#7
Zhenyun Qian, Sungho Kang, Vageeswar Rajaram, Cristian Cassella, Nicol E McGruer, Matteo Rinaldi
State-of-the-art sensors use active electronics to detect and discriminate light, sound, vibration and other signals. They consume power constantly, even when there is no relevant data to be detected, which limits their lifetime and results in high costs of deployment and maintenance for unattended sensor networks. Here we propose a device concept that fundamentally breaks this paradigm-the sensors remain dormant with near-zero power consumption until awakened by a specific physical signature associated with an event of interest...
September 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28892100/kidney-physiology-a-size-bandpass-filter
#8
Yue Lu, Zhen Gu
No abstract text is available yet for this article.
September 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28892099/glomerular-barrier-behaves-as-an-atomically-precise-bandpass-filter-in-a-sub-nanometre-regime
#9
Bujie Du, Xingya Jiang, Anindita Das, Qinhan Zhou, Mengxiao Yu, Rongchao Jin, Jie Zheng
The glomerular filtration barrier is known as a 'size cutoff' slit, which retains nanoparticles or proteins larger than 6-8 nm in the body and rapidly excretes smaller ones through the kidneys. However, in the sub-nanometre size regime, we have found that this barrier behaves as an atomically precise 'bandpass' filter to significantly slow down renal clearance of few-atom gold nanoclusters (AuNCs) with the same surface ligands but different sizes (Au18, Au15 and Au10-11). Compared to Au25 (∼1.0 nm), just few-atom decreases in size result in four- to ninefold reductions in renal clearance efficiency in the early elimination stage, because the smaller AuNCs are more readily trapped by the glomerular glycocalyx than larger ones...
September 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28846103/water-treatment-a-scalable-graphene-based-membrane
#10
Ivan V Vlassiouk
No abstract text is available yet for this article.
August 28, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28846102/effective-nacl-and-dye-rejection-of-hybrid-graphene-oxide-graphene-layered-membranes
#11
Aaron Morelos-Gomez, Rodolfo Cruz-Silva, Hiroyuki Muramatsu, Josue Ortiz-Medina, Takumi Araki, Tomoyuki Fukuyo, Syogo Tejima, Kenji Takeuchi, Takuya Hayashi, Mauricio Terrones, Morinobu Endo
Carbon nanomaterials are robust and possess fascinating properties useful for separation technology applications, but their scalability and high salt rejection when in a strong cross flow for long periods of time remain challenging. Here, we present a graphene-based membrane that is prepared using a simple and environmentally friendly method by spray coating an aqueous dispersion of graphene oxide/few-layered graphene/deoxycholate. The membranes were robust enough to withstand strong cross-flow shear for a prolonged period (120 h) while maintaining NaCl rejection near 85% and 96% for an anionic dye...
August 28, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28825714/cell-targetable-dna-nanocapsules-for-spatiotemporal-release-of-caged-bioactive-small-molecules
#12
Aneesh T Veetil, Kasturi Chakraborty, Kangni Xiao, Myles R Minter, Sangram S Sisodia, Yamuna Krishnan
Achieving triggered release of small molecules with spatial and temporal precision at designated cells within an organism remains a challenge. By combining a cell-targetable, icosahedral DNA-nanocapsule loaded with photoresponsive polymers, we show cytosolic delivery of small molecules with the spatial resolution of single endosomes in specific cells in Caenorhabditis elegans. Our technology can report on the extent of small molecules released after photoactivation as well as pinpoint the location at which uncaging of the molecules occurred...
August 21, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28825713/spatially-and-time-resolved-magnetization-dynamics-driven-by-spin-orbit-torques
#13
Manuel Baumgartner, Kevin Garello, Johannes Mendil, Can Onur Avci, Eva Grimaldi, Christoph Murer, Junxiao Feng, Mihai Gabureac, Christian Stamm, Yves Acremann, Simone Finizio, Sebastian Wintz, Jörg Raabe, Pietro Gambardella
Current-induced spin-orbit torques are one of the most effective ways to manipulate the magnetization in spintronic devices, and hold promise for fast switching applications in non-volatile memory and logic units. Here, we report the direct observation of spin-orbit-torque-driven magnetization dynamics in Pt/Co/AlOx dots during current pulse injection. Time-resolved X-ray images with 25 nm spatial and 100 ps temporal resolution reveal that switching is achieved within the duration of a subnanosecond current pulse by the fast nucleation of an inverted domain at the edge of the dot and propagation of a tilted domain wall across the dot...
August 21, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28825712/spintronics-anatomy-of-spin-orbit-torques
#14
Kei Yamamoto, Hidekazu Kurebayashi
No abstract text is available yet for this article.
August 21, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28805819/donor-qubits-in-silicon-electrical-control-of-nuclear-spins
#15
Andrea Morello
No abstract text is available yet for this article.
August 14, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28805818/all-electric-control-of-donor-nuclear-spin-qubits-in-silicon
#16
Anthony J Sigillito, Alexei M Tyryshkin, Thomas Schenkel, Andrew A Houck, Stephen A Lyon
The electronic and nuclear spin degrees of freedom of donor impurities in silicon form ultra-coherent two-level systems that are potentially useful for applications in quantum information and are intrinsically compatible with industrial semiconductor processing. However, because of their smaller gyromagnetic ratios, nuclear spins are more difficult to manipulate than electron spins and are often considered too slow for quantum information processing. Moreover, although alternating current magnetic fields are the most natural choice to drive spin transitions and implement quantum gates, they are difficult to confine spatially to the level of a single donor, thus requiring alternative approaches...
August 14, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28805817/room-temperature-current-blockade-in-atomically-defined-single-cluster-junctions
#17
Giacomo Lovat, Bonnie Choi, Daniel W Paley, Michael L Steigerwald, Latha Venkataraman, Xavier Roy
Fabricating nanoscopic devices capable of manipulating and processing single units of charge is an essential step towards creating functional devices where quantum effects dominate transport characteristics. The archetypal single-electron transistor comprises a small conducting or semiconducting island separated from two metallic reservoirs by insulating barriers. By enabling the transfer of a well-defined number of charge carriers between the island and the reservoirs, such a device may enable discrete single-electron operations...
August 14, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28785093/magnetic-quantum-phase-transition-in-cr-doped-bi2-sexte1-x-3-driven-by-the-stark-effect
#18
Zuocheng Zhang, Xiao Feng, Jing Wang, Biao Lian, Jinsong Zhang, Cuizu Chang, Minghua Guo, Yunbo Ou, Yang Feng, Shou-Cheng Zhang, Ke He, Xucun Ma, Qi-Kun Xue, Yayu Wang
The recent experimental observation of the quantum anomalous Hall effect has cast significant attention on magnetic topological insulators. In these magnetic counterparts of conventional topological insulators such as Bi2Te3, a long-range ferromagnetic state can be established by chemical doping with transition-metal elements. However, a much richer electronic phase diagram can emerge and, in the specific case of Cr-doped Bi2(SexTe1-x)3, a magnetic quantum phase transition tuned by the actual chemical composition has been reported...
August 7, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28785092/topical-tissue-nano-transfection-mediates-non-viral-stroma-reprogramming-and-rescue
#19
Daniel Gallego-Perez, Durba Pal, Subhadip Ghatak, Veysi Malkoc, Natalia Higuita-Castro, Surya Gnyawali, Lingqian Chang, Wei-Ching Liao, Junfeng Shi, Mithun Sinha, Kanhaiya Singh, Erin Steen, Alec Sunyecz, Richard Stewart, Jordan Moore, Thomas Ziebro, Robert G Northcutt, Michael Homsy, Paul Bertani, Wu Lu, Sashwati Roy, Savita Khanna, Cameron Rink, Vishnu Baba Sundaresan, Jose J Otero, L James Lee, Chandan K Sen
Although cellular therapies represent a promising strategy for a number of conditions, current approaches face major translational hurdles, including limited cell sources and the need for cumbersome pre-processing steps (for example, isolation, induced pluripotency). In vivo cell reprogramming has the potential to enable more-effective cell-based therapies by using readily available cell sources (for example, fibroblasts) and circumventing the need for ex vivo pre-processing. Existing reprogramming methodologies, however, are fraught with caveats, including a heavy reliance on viral transfection...
August 7, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28785091/photon-triggered-nanowire-transistors
#20
Jungkil Kim, Hoo-Cheol Lee, Kyoung-Ho Kim, Min-Soo Hwang, Jin-Sung Park, Jung Min Lee, Jae-Pil So, Jae-Hyuck Choi, Soon-Hong Kwon, Carl J Barrelet, Hong-Gyu Park
Photon-triggered electronic circuits have been a long-standing goal of photonics. Recent demonstrations include either all-optical transistors in which photons control other photons or phototransistors with the gate response tuned or enhanced by photons. However, only a few studies report on devices in which electronic currents are optically switched and amplified without an electrical gate. Here we show photon-triggered nanowire (NW) transistors, photon-triggered NW logic gates and a single NW photodetection system...
August 7, 2017: Nature Nanotechnology
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