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Nano Letters

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https://www.readbyqxmd.com/read/29775318/roll-to-roll-nanoforming-of-metals-using-laser-induced-superplasticity
#1
Debkalpa Goswami, Juan Camilo Múnera, Aniket Pal, Behnam Sadri, Caio Lui Paganelli Guzzo Scarpetti, Ramses V Martinez
This letter describes a low-cost, scalable nanomanufacturing process that enables the continuous forming of thin metallic layers with nanoscale accuracy using roll-to-roll, laser-induced superplasticity (R2RLIS). R2RLIS uses a laser shock to induce the ultrahigh strain rate deformation of metallic films at room temperature into low-cost polymeric nanomolds, independently of the original grain size of the metal. This simple and inexpensive nanoforming method does not require access to cleanrooms and associated facilities, and can be easily implemented on conventional CO2 lasers, enabling laser systems commonly used for rapid prototyping or industrial cutting and engraving to fabricate uniform and three-dimensional crystalline metallic nanostructures over large areas...
May 18, 2018: Nano Letters
https://www.readbyqxmd.com/read/29775315/strain-mapping-of-two-dimensional-heterostructures-with-sub-picometer-precision
#2
Yimo Han, Kayla X Nguyen, Michael Cao, Paul D Cueva, Saien Xie, Mark W Tate, Prafull Purohit, Sol M Gruner, Jiwoong Park, David A Muller
Next-generation, atomically thin devices require in-plane, one-dimensional heterojunctions to electrically connect different two-dimensional (2D) materials. However, the lattice mismatch between most 2D materials leads to unavoidable strain, dislocations, or ripples, which can strongly affect their mechanical, optical, and electronic properties. We have developed an approach to map 2D heterojunction lattice and strain profiles with sub-picometer precision and the ability to identify dislocations and out-of-plane ripples...
May 18, 2018: Nano Letters
https://www.readbyqxmd.com/read/29775312/limits-of-directed-self-assembly-in-block-copolymers
#3
Karim Raafat Gadelrab, Yi Ding, Ricardo Pablo-Pedro, Hsieh Chen, Kevin W Gotrik, David G Tempel, Caroline A Ross, Alfredo Alexander-Katz
Understanding the conditions under which defects appear in self-assembling soft-matter systems is of great importance, for example, in the development of block-copolymer (BCP) nanolithography. Here, we explore the limits of directed self-assembly of BCPs by deliberately adding random imperfections in the template. Our results show that defects emerge due to local "shear-like" distortions of the polymer-template system, a new mechanism that is fundamentally different from canonical mechanisms of 2D melting...
May 18, 2018: Nano Letters
https://www.readbyqxmd.com/read/29772904/why-cvd-grown-mos2-samples-outperform-pvd-samples-time-domain-ab-initio-analysis
#4
Linqiu Li, Run Long, Oleg V Prezhdo
Two-dimensional transition metal dichalcogenides (TMDs) have drawn strong attention due to their unique properties and diverse applications. However, TMD performance depends strongly on material quality and defect morphology. Experiments show that samples grown by chemical vapor deposition (CVD) outperform those obtained by physical vapor deposition (PVD). Experiments also show that CVD samples exhibit vacancy defects, while antisite defects are frequently observed in PVD samples. Our time-domain ab initio study demonstrates that both antisites and vacancies accelerate trapping and nonradiative recombination of charge carriers, but antisites are much more detrimental than vacancies...
May 18, 2018: Nano Letters
https://www.readbyqxmd.com/read/29772171/motion-control-and-optical-interrogation-of-a-levitating-single-nv-in-vacuum
#5
Gerard Planes Conangla, Andreas W Schell, Raul A Rica, Romain Quidant
Levitation optomechanics exploits the unique mechanical properties of trapped nano-objects in vacuum in order to address some of the limitations of clamped nanomechanical resonators. In particular, its performance is foreseen to contribute to a better understanding of quantum decoherence at the mesoscopic scale as well as to lead to novel ultra-sensitive sensing schemes. While most efforts have so far focused on optical trapping of low absorbing silica particles, further opportunities arise from levitating objects with internal degrees of freedom like color centers...
May 17, 2018: Nano Letters
https://www.readbyqxmd.com/read/29771532/electrical-and-optical-tunability-in-all-inorganic-halide-perovskite-alloy-nanowires
#6
Teng Lei, Minliang Lai, Qiao Kong, Dylan Lu, Woochul Lee, Letian Dou, Vincent Wu, Yi Yu, Peidong Yang
Alloying different semiconductors is a powerful approach to tuning the optical and electronic properties of semiconductor materials. In halide perovskites (ABX3), alloys with different anions have been widely studied and great band gap tunability in the visible range has been achieved. However, perovskite alloys with different cations at the "B" site are less understood due to the synthetic challenges. Herein, we firstly have developed the synthesis of single crystalline CsPbxSn1-xI3 nanowires (NWs)...
May 17, 2018: Nano Letters
https://www.readbyqxmd.com/read/29771127/anapoles-in-free-standing-iii-v-nanodisks-enhancing-second-harmonic-generation
#7
Maria Timofeeva, Lukas Lang, Flavia Timpu, Claude Renaut, Alexei Bouravleuv, Igor V Shtrom, George Cirlin, Rachel Grange
Nonradiating electromagnetic configurations in nanostructures open new horizons for applications due to two essential features: lack of energy losses and invisibility to the propagating electromagnetic field. Such radiationless configurations form a basis for new types of nanophotonic devices, where a strong electromagnetic field confinement can be achieved together with lossless interactions between nearby components. In our work, we present a new design of free-standing disk nanoantennas with nonradiating current distributions for the optical near-infrared range...
May 17, 2018: Nano Letters
https://www.readbyqxmd.com/read/29771126/magnesium-nanoparticle-plasmonics
#8
John Biggins, Sadegh Yazdi, Emilie Ringe
Nanoparticles of some metals (Cu/Ag/Au) sustain oscillations of their electron cloud called localized surface plasmon resonances (LSPRs). These resonances can occur at optical frequencies and be driven by light, generating enhanced electric fields and spectacular photon scattering. However, current plasmonic metals are rare, expensive, and have a limited resonant frequency range. Recently, much attention has been focused on earth-abundant Al, but Al nanoparticles cannot resonate in the IR. The earth-abundant Mg nanoparticles reported here surmount this limitation...
May 17, 2018: Nano Letters
https://www.readbyqxmd.com/read/29763562/unraveling-the-enzymatic-activity-of-oxygenated-carbon-nanotubes-and-their-application-in-the-treatment-of-bacterial-infections
#9
Huan Wang, Penghui Li, Dongqin Yu, Yan Zhang, Zhenzhen Wang, Chaoqun Liu, Hao Qiu, Zhen Liu, Jinsong Ren, Xiaogang Qu
Carbon nanotubes (CNTs) and their derivatives have emerged as a series of efficient biocatalysts to mimic the function of natural enzymes in recent years. However, the unsatisfiable enzymatic efficiency usually limits their practical usage ranging from materials science to biotechnology. Here, for the first time, we present the synthesis of several oxygenated-group-enriched carbon nanotubes (o-CNTs) via a facile but green approach, as well as their usage as high-performance peroxidase mimics for biocatalytic reaction...
May 17, 2018: Nano Letters
https://www.readbyqxmd.com/read/29768012/asymmetric-two-terminal-graphene-detector-for-broadband-radiofrequency-heterodyne-and-self-mixing
#10
Jiayue Tong, Matthew C Conte, Thomas Goldstein, K Sigfrid Yngvesson, Joseph C Bardin, Jun Yan
Graphene, a single atomic layer of covalently bonded carbon atoms, has been investigated intensively for optoelectronics and represents a promising candidate for high-speed electronics. Here we present a microwave mixer constructed as an asymmetrically-contacted two-terminal graphene device based on the thermoelectric effect. We report a 50 GHz (minimum) mixer bandwidth as well as 130 V/W extrinsic direct-detection responsivity. Anomalous second-harmonic generation due to self-mixing in our graphene detector is also observed...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29768011/detection-of-sub-fm-dna-with-target-recycling-and-self-assembly-amplification-on-graphene-field-effect-biosensors
#11
Zhaoli Gao, Han Xia, Jonathan Zauberman, Maurizio Tomaiuolo, Jinglei Ping, Qicheng Zhang, Pedro Ducos, Huacheng Ye, Sheng Wang, Xinping Yang, Fahmida Lubna, Zhengtang Tom Luo, Li Ren, Alan T Charlie Johnson
All-electronic DNA biosensors based on graphene field effect transistors (GFETs) offer the prospect of simple and cost-effective diagnostics. For GFET sensors based on complementary probe DNA, the sensitivity is limited by the binding affinity of the target oligonucleotide, in the nM-range for 20-mer targets. We report a ~20,000× improvement in sensitivity through the use of engineered hairpin probe DNA that allows for target recycling and hybridization chain reaction. This enables detection of 21-mer target DNA at sub-fM concentration and provides superior specificity against single-base mismatched oligomers...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29768010/highly-sensitive-electromechanical-piezoresistive-pressure-sensors-based-on-large-area-layered-ptse2-films
#12
Stefan Wagner, Chanyoung Yim, Niall McEvoy, Satender Kataria, Volkan Yokaribas, Agnieszka Kuc, Stephan Pindl, Claus-Peter Fritzen, Thomas Heine, Georg S Duesberg, Max C Lemme
Two-dimensional (2D) layered materials are ideal for micro- and nanoelectromechanical systems (MEMS/NEMS) due to their ultimate thinness. Platinum diselenide (PtSe2 ), an exciting and unexplored 2D transition metal dichalcogenides (TMD) material, is particularly interesting because its scalable and low temperature growth process is compatible with silicon technology. Here, we explore the potential of thin PtSe2 films as electromechanical piezoresistive sensors. All experiments have been conducted with semi-metallic PtSe2 films grown by thermally assisted conversion of Pt at a CMOS-compatible temperature of 400°C...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29768000/monolayer-molybdenum-disulfide-transistors-with-single-atom-thick-gates
#13
Yibo Zhu, Yijun Li, Ghidewon Arefe, Robert A Burke, Cheng Tan, Yufeng Hao, Xiaochi Liu, Xue Liu, Won Jong Yoo, Madan Dubey, Qiao Lin, James C Hone
Two-dimensional transition metal dichalcogenides (TMDs) are unique candidates for development of next-generation electronic devices. However, the large contact resistance between metal and the monolayer TMDs have significantly limited the devices' performance. Also, integration of ultrathin high-k dielectric layer with TMD remains difficult due to the lack of dangling bonds on the surface of TMDs. We present monolayer molybdenum disulfide field effect transistors with bottom local gates consisting of monolayer graphene...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29767987/a-full-visible-spectrum-invisibility-cloak-for-mesoscopic-metal-wires
#14
Sang-Woo Kim, Byeong Wan An, Eunjin Cho, Byung Gwan Hyun, Yoon-Jong Moon, Sun-Kyung Kim, Jang-Ung Park
Structured metals can sustain a very large scattering cross-section that is induced by localized surface plasmons, which often has an adverse effect on their use as transparent electrodes in displays, touch screens, and smart windows due to an issue of low clarity. Here, we report a broadband optical cloaking strategy for the network of mesoscopic metal wires with submicrometer to micrometer diameters, which is exploited for manufacturing and application of high-clarity metal-wires-based transparent electrodes...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29767986/low-frequency-current-fluctuations-and-sliding-of-the-charge-density-waves-in-two-dimensional-materials
#15
Guanxiong Liu, Sergey Rumyantsev, Matthew A Bloodgood, Tina T Salguero, Alexander A Balandin
We investigated low-frequency noise in two-dimensional (2D) charge density wave (CDW) systems-1T-TaS2 thin films-as they were driven from the nearly commensurate (NC) to incommensurate (IC) CDW phases by voltage and temperature stimuli. This study revealed that noise in 1T-TaS2 has two pronounced maxima at the bias voltages, which correspond to the onset of CDW sliding and the NC-to-IC phase transition. We observed unusual Lorentzian features and exceptionally strong noise dependence on electric bias and temperature, leading to the conclusion that electronic noise in 2D CDW systems has a unique physical origin different from known fundamental noise types...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29767985/imaging-nanometer-phase-coexistence-at-defects-during-the-insulator-metal-phase-transformation-in-vo-2-thin-films-by-resonant-soft-x-ray-holography
#16
Luciana Vidas, Christian Guenther, Timothy Miller, Bastian Pfau, Daniel Perez, Elias Martinez, Michael Schneider, Erik Guehrs, Robert E Marvel, Kent Hallman, Richard F Haglund, Stefan Eisebitt, Simon Wall
We use resonant soft X-ray holography to image the insulator-metal phase transition in vanadium dioxide with element and polarization specificity and nanometer spatial resolution. We observe that nanoscale inhomogenity in the film results in spatial-dependent transition pathways between the insulating and metallic states. Additional nanoscale phases form in the vicinity of defects which are not apparent in the initial or final states of the system, which would be missed in area-integrated X-ray absorption measurements...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29767979/ultra-compliant-heterogeneous-copper-tin-nanowire-arrays-making-a-super-solder
#17
Wei Gong, Pengfei Li, Yunheng Zhang, Xuhui Feng, Joshua Major, Douglas DeVoto, Paul Paret, Charles King, Sreekant Narumanchi, Sheng Shen
Due to the substantial increase in power density, thermal interface resistance that can constitute more than 50 % of the total thermal resistance has generally become a bottleneck for thermal management in electronics. However, conventional thermal interface materials (TIMs) such as solder, epoxy, gel, and grease cannot fulfill the requirements of electronics for high-power and long-term operation. Here we demonstrate a high-performance TIM consisting of a heterogeneous copper-tin nanowire array which we term "super-solder" to emulate the role of conventional solders in bonding various surfaces...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29767531/correction-to-ultrathin-au-alloy-nanowires-at-the-liquid-liquid-interface
#18
Dipanwita Chatterjee, Shwetha Shetty, Knut Müller-Caspary, Tim Grieb, Florian F Krause, Marco Schowalter, Andreas Rosenauer, Narayanan Ravishankar
No abstract text is available yet for this article.
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29767529/fractal-gold-nanoframework-for-highly-stretchable-transparent-strain-insensitive-conductors
#19
My Duyen Ho, Yiyi Liu, Dashen Dong, Yunmeng Zhao, Wenlong Cheng
Percolation networks of one-dimensional (1D) building blocks (e.g., metallic nanowires or carbon nanotubes) represent the mainstream strategy to fabricate stretchable conductors. One of the inherent limitations is the control over junction resistance between 1D building blocks in natural and strained states of conductors. Herein, we report highly stretchable transparent strain-insensitive conductors using fractal gold (F-Au) nanoframework based on a one-pot templateless wet chemistry synthesis method. The monolayered F-Au nanoframework (∼20 nm in thickness) can be obtained from the one-pot synthesis without any purification steps involved and can be transferred directly to arbitrary substrates like polyethylene terephthalate, food-wrap, polydimethylsiloxane (PDMS), and ecoflex...
May 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29763566/low-power-optical-trapping-of-nanoparticles-and-proteins-with-resonant-coaxial-nanoaperture-using-10-nm-gap
#20
Daehan Yoo, Gurunatha Kargal Laxminarayana, Han-Kyu Choi, Daniel A Mohr, Christopher T Ertsgaard, Reuven Gordon, Sang-Hyun Oh
We present optical trapping with a 10 nm gap resonant coaxial nanoaperture in a gold film. Large arrays of 600 resonant plasmonic coaxial nanoaperture traps are produced on a single chip via atomic layer lithography with each aperture tuned to match a 785 nm laser source. We show that these single apertures can act as efficient nanotweezers with a sharp potential well, capable of trapping 30 nm polystyrene nanoparticles and streptavidin molecules with laser powers as low as 4.7 mW. Our large arrays of plasmonic tweezers shown here offer a promising platform for the practical and broad application of trapping and manipulating biomolecules and nanoparticles...
May 15, 2018: Nano Letters
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