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ACS Nano

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https://www.readbyqxmd.com/read/28719750/electrostatic-interaction-assisted-construction-of-3d-networks-of-manganese-dioxide-nanosheets-for-flexible-high-performance-solid-state-asymmetric-supercapacitors
#1
Na Liu, Yan Li Su, Zhiqiang Wang, Zhen Wang, Jinsong Xia, Yong Chen, Zhigang Zhao, Qingwen Li, Fengxia Geng
A three-dimensional (3D) macroscopic network of manganese oxide MnO2 sheets was firstly synthesized by an easily scalable solution approach, grafting the negatively charged surfaces of the MnO2 sheets with an aniline monomer by electrostatic interactions followed by a quick chemical oxidizing polymerization reaction. The obtained structure possessed MnO2 sheets interconnected with polyaniline chains, producing a 3D monolith rich of mesopores. The MnO2 sheets had almost all their reactive centers exposed on the electrode surface, combining with the electron transport highways provided by polyaniline and the shortened diffusion paths provided by the porous structure, the deliberately designed electrode achieved excellent capacitance of 762 F g-1 at a current of 1 A g-1 and cycling performance with a capacity retention of 90% over 8000 cycles...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719748/low-temperature-fusible-silver-micro-nano-dendrites-based-electrically-conductive-composites-for-next-generation-printed-fuse-links
#2
Rui Yang, Yang Wang, Dang Wu, Yubin Deng, Yingying Luo, Xiaoya Cui, Xuanyu Wang, Zhixue Shu, Cheng Yang
We systematically investigate the long-neglected low-temperature fusing behavior of silver micro/nano-dendrites and demonstrate the feasibility of employing this intriguing property for the printed electronics application, i.e. printed fuse-link. Fuse-link has experienced insignificant changes since they were invented in 1890's. By introducing the silver micro/nano-dendrites based electrically conductive composites (ECCs) as the printed fusible element, coupled with the state-of-the-art printed electronics technology, key performance characteristics of a fuse-link are dramatically improved as compared with the commercially-available counterparts, including expedient fabrication process, lower-available rated current (40% of the minimum value of Littelfuse 467 series fuses), shorter response time (only 3...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719741/macroscopic-strain-induced-transition-from-quasi-infinite-gold-nanoparticle-chains-to-defined-plasmonic-oligomers
#3
Anja Maria Steiner, Martin Mayer, Maximilian Seuss, Svetoslav Nikolov, Kenneth D Harris, Alexander Alexeev, Christian Kuttner, Tobias A F Koenig, Andreas Fery
We investigate the formation of chains of few plasmonic nanoparticles - so called plasmonic oligomers - by strain induced fragmentation of linear particle assemblies. Detailed investigations of the fragmentation process are conducted by in-situ atomic force microscopy (AFM) and UV-vis-NIR spectroscopy. Based on these experimental results and mechanical simulations computed by the lattice spring model (LSM), we propose a formation mechanism which explains the observed decrease of chain polydispersity upon increasing strain and provides experimental guidelines for tailoring chain length distribution...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719740/tuning-superhydrophobic-nanostructures-to-enhance-jumping-droplet-condensation
#4
Megan D Mulroe, Bernadeta R Srijanto, S Farzad Ahmadi, C Patrick Collier, Jonathan B Boreyko
It was recently discovered that condensation growing on a nanostructured superhydrophobic surface can spontaneously jump off the surface, triggered by naturally occurring coalescence events. Many reports have observed that droplets must grow to a size of order 10 μm before jumping is enabled upon coalescence; however, it remains unknown how the critical jumping size relates to the topography of the underlying nanostructure. Here, we characterize the dynamic behavior of condensation growing on six different superhydrophobic nanostructures, where the topography of the nanopillars was systematically varied...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719739/graphene-electronic-tattoo-sensors
#5
Shideh Kabiri Ameri, Rebecca Ho, Hongwoo Jang, Li Tao, Youhua Wang, Liu Wang, David M Schnyer, Deji Akinwande, Nanshu Lu
Tattoo-like epidermal sensors are an emerging class of truly wearable electronics owing to their thinness and softness. While most of them are based on thin metal films, silicon membrane, or nanoparticle-based printable inks, we report a sub-micron thick, multimodal electronic tattoo sensors that are made of graphene. The graphene electronic tattoo (GET) is designed with filamentary serpentines and fabricated by a cost- and time-effective "wet transfer, dry patterning" method. It has a total thickness of 463 ± 30 nm, an optical transparency of ~85%, and a stretchability of more than 40%...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719182/atomic-white-out-enabling-atomic-circuitry-through-mechanically-induced-bonding-of-single-hydrogen-atoms-to-a-silicon-surface
#6
Taleana Rochelle Huff, Hatem Labidi, Mohammad Rashidi, Mohammad Koleini, Roshan Achal, Mark Henry Salomons, Robert A Wolkow
We report the mechanically induced formation of a silicon-hydrogen covalent bond and its application in engineering nanoelectronic devices. We show that using the tip of a non-contact atomic force microscope (NC-AFM), a single hydrogen atom could be vertically manipulated. When applying a localized electronic excitation, a single hydrogen atom is desorbed from the hydrogen passivated surface and can be transferred to the tip apex as evidenced from a unique signature in frequency shift curves. In the absence of tunnel electrons and electric field in the scanning probe microscope junction at 0 V, the hydrogen atom at the tip apex is brought very close to a silicon dangling bond, inducing the mechanical formation of a silicon-hydrogen covalent bond and the passivation of the dangling bond...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719175/a-simple-cleated-dna-walker-that-hangs-on-to-surfaces
#7
Cheulhee Jung, Peter B Allen, Andrew D Ellington
We designed and demonstrated a single-legged or unipedal walker that has a "cleat" that allows it to persistently associate with a track and make autonomous decisions about movement. The walker is highly processive over long periods of time, as shown by its movement over a microparticle surface suffused with substrate. The simple design can be readily optimized on the basis of simple energetic considerations. The walker can be used for signal amplification and should prove especially valuable for programming amorphous computations within chemical reaction networks...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28718619/radial-dopant-placement-for-tuning-plasmonic-properties-in-metal-oxide-nanocrystals
#8
Brandon M Crockett, Adam W Jansons, Kristopher M Koskela, Darren W Johnson, James E Hutchison
Doped metal oxide nanocrystals that exhibit tunable localized surface plasmon resonances (LSPRs) represent an intriguing class of nanomaterials that show promise for a variety of applications from spectroscopy to sensing. LSPRs arise in these materials through the introduction of aliovalent dopants and lattice oxygen vacancies. Tuning the LSPR shape and energy is generally accomplished through controlling the concentration or identity of dopants in a nanocrystal, but the lack of finer synthetic control leaves several fundamental questions unanswered regarding the effects of radial dopant placement, size, and nanocrystalline architecture on the LSPR energy and damping...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28640995/colloidal-gold-nanoparticles-induce-changes-in-cellular-and-subcellular-morphology
#9
Xiaowei Ma, Raimo Hartmann, Dorleta Jimenez de Aberasturi, Fang Yang, Stefaan J H Soenen, Bella B Manshian, Jonas Franz, Daniel Valdeperez, Beatriz Pelaz, Neus Feliu, Norbert Hampp, Christoph Riethmüller, Henning Vieker, Natalie Frese, Armin Gölzhäuser, Michael Simonich, Robert L Tanguay, Xing-Jie Liang, Wolfgang J Parak
Exposure of cells to colloidal nanoparticles (NPs) can have concentration-dependent harmful effects. Mostly, such effects are monitored with biochemical assays or probes from molecular biology, i.e., viability assays, gene expression profiles, etc., neglecting that the presence of NPs can also drastically affect cellular morphology. In the case of polymer-coated Au NPs, we demonstrate that upon NP internalization, cells undergo lysosomal swelling, alterations in mitochondrial morphology, disturbances in actin and tubulin cytoskeleton and associated signaling, and reduction of focal adhesion contact area and number of filopodia...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28715195/thermo-mechanical-response-of-self-assembled-nanoparticle-membranes
#10
Yifan Wang, Henry Chan, Badri Narayanan, Sean P McBride, Subramanian K R S Sankaranarayanan, Xiao-Min Lin, Heinrich Martin Jaeger
Monolayers composed of colloidal nanoparticles, with a thickness of less than ten nanometers, have remarkable mechanical moduli and can suspend over micron-sized holes to form free-standing membranes. In this paper, we discuss experiments and coarse-grained molecular dynamics simulations characterizing the thermo-mechanical properties of these self-assembled nanoparticle membranes. These membranes remain strong and resilient up to temperatures much higher than previous simulation predictions, and exhibit an unexpected hysteretic behavior during the first heating-cooling cycle...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28715193/polymerization-of-nanoplates-into-controlled-architectures-with-adaptive-dynamics
#11
Binbin Luo, John W Smith, Zixuan Wu, Juyeong Kim, Zihao Ou, Qian Chen
Highly anisometric nanoparticles have distinctive mechanical, electrical, and thermal properties and are therefore appealing candidates for use as self-assembly building blocks. Here we demonstrate that ultra-anisometric nanoplates, which have a nanoscale thickness but a micrometer-scale edge length, offer many materials design capabilities. In particular, we show that these nanoplates "copolymerize" in a predictable way with patchy spheres into one- and two-dimensional structures with tunable architectural properties...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28715178/flexible-and-robust-superomniphobic-surfaces-created-by-localized-photofluidization-of-azopolymer-pillars
#12
Jaeho Choi, Wonhee Jo, Seung Yeol Lee, Yeon Sik Jung, Shin-Hyun Kim, Hee-Tak Kim
Springtails, insects which breathe through their skins, possess mushroom-shaped nanostructures. As doubly re-entrant geometry in the mushroom head enhances the resistance against liquid invasion, the springtails have robust, liquid-free omniphobic skins. Although omniphobic surfaces are promising for various applications, it remains an important challenge to mimic the structural feature of springtails. This paper presents a pragmatic method to create doubly re-entrant nanostructures and robust super-omniphobic surfaces by exploiting localized photofluidization of azopolymers...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28715171/limitations-of-structural-superlubricity-chemical-bonds-versus-contact-size
#13
Dirk Dietzel, Ján Brndiar, Ivan Štich, André Schirmeisen
Structural superlubricity describes the state of virtually frictionless sliding if two atomically flat interfaces are incommensurate, that is, they share no common periodicity. Despite the exciting prospects of this low friction phenomenon, there are physical limitations to the existence of this state. Theory predicts that the contact size is one fundamental limit, where the critical size threshold mainly depends on the interplay between lateral contact compliance and interface interaction energies. Here we provide experimental evidence for this size threshold by measuring the sliding friction force of differently sized antimony particles on MoS2...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28715167/computationally-driven-two-dimensional-materials-design-what-is-next
#14
Jie Pan, Stephan Lany, Yue Qi
Two-dimensional (2D) materials offer many key advantages to innovative applications, such as spintronics and quantum information processing. Theoretical computations have accelerated 2D materials design. In this issue of ACS Nano, Kumar et al. report that ferromagnetism can be achieved in functionalized nitride MXene based on first-principles calculations. Their computational results shed light on a potentially vast group of materials for the realization of 2D magnets. In this Perspective, we briefly summarize the promising properties of 2D materials and the role theory has played in predicting these properties...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28714668/self-registered-self-assembly-of-block-copolymers
#15
Lei Wan, Ricardo Ruiz, He Gao, Thomas R Albrecht
Directed self-assembly (DSA) of block copolymer (BCP) thin films, especially with density multiplication, is one of the most promising options for further improving resolution and throughput in nanolithography. However, controlling defect density has been one of the major hurdles for many DSA applications. Both thermodynamically and kinetically, defect-free patterns favor the use of low density multiplication factors and thinner films, which undermine the promise of enhanced resolution and the formation of robust masks for pattern transfer...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28700210/large-in-plane-and-vertical-piezoelectricity-in-janus-transition-metal-dichalchogenides
#16
Liang Dong, Jun Lou, Vivek B Shenoy
Piezoelectricity in 2D van der Waals materials has received considerable interest because of potential applications in nanoscale energy harvesting, sensors, and actuators. However, in all the systems studied to date, strain and electric polarization are confined to the basal plane, limiting the operation of piezoelectric devices. In this paper, based on ab initio calculations, we report a 2D materials system, namely, the recently synthesized Janus MXY (M = Mo or W, X/Y = S, Se, or Te) monolayer and multilayer structures, with large out-of-plane piezoelectric polarization...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28700206/drug-porous-silicon-dual-luminescent-system-for-monitoring-and-inhibition-of-wound-infection
#17
Xisheng Chen, Fangjie Wo, Yao Jin, Jie Tan, Yan Lai, Jianmin Wu
Wound monitoring and curing is of great importance in biomedical research. This work created a smart bandage that can simultaneously monitor and inhibit wound infection. The main components of the smart bandage are luminescent porous silicon (LuPSi) particles loaded with ciprofloxacin (CIP). This dual luminescent system can undergo accelerated fluorescent color change from red to blue upon the stimulation of reactive oxygen species (ROS) and elevated pH, which are main biomarkers in the infected wound. The mechanism behind the chemical-triggered fluorescent color change was studied in detail...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28682595/scalable-fabrication-and-integration-of-graphene-microsupercapacitors-through-full-inkjet-printing
#18
Jiantong Li, Szymon Sollami Delekta, Panpan Zhang, Sheng Yang, Martin R Lohe, Xiaodong Zhuang, Xinliang Feng, Mikael Östling
A simple full-inkjet-printing technique is developed for the scalable fabrication of graphene-based microsupercapacitors (MSCs) on various substrates. High-performance graphene inks are formulated by integrating the electrochemically exfoliated graphene with a solvent exchange technique to reliably print graphene interdigitated electrodes with tunable geometry and thickness. Along with the printed polyelectrolyte, poly(4-styrenesulfonic acid), the fully printed graphene-based MSCs attain the highest areal capacitance of ∼0...
July 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28712296/competing-annulene-and-radialene-structures-in-a-single-anti-aromatic-molecule-studied-by-high-resolution-atomic-force-microscopy
#19
Shigeki Kawai, Keisuke Takahashi, Shingo Ito, Rémy Pawlak, Tobias Meier, Peter Spijker, Filippo Federici Canova, John Tracey, Kyoko Nozaki, Adam S Foster, Ernst Meyer
According to Hückel theory, an anti-aromatic molecule possessing (4n)π-electrons becomes unstable. Although the stabilization has been demonstrated by radialene-type structures - fusing aromatic rings to anti-aromatic rings - in solution, such molecules have never been studied at a single molecular level. Here, we synthesize a cyclobutadiene derivative, dibenzo[b,h]biphenylene, by an on-surface intramolecular reaction. With a combination of high-resolution atomic force microscopy and density functional theory calculations, we found that a radialene structure significantly reduces anti-aromaticity of the cyclobutadiene core, extracting π-electrons, while the small four-membered cyclic structure keeps a high density of the total charge...
July 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28712290/high-affinity-assisted-nanoscale-alloys-as-remarkable-bifunctional-catalyst-for-alcohol-oxidation-and-oxygen-reduction-reactions
#20
Jitendra N Tiwari, Wang Geun Lee, Siraj Sultan, Muhammad Yousuf, Ahmad M Harzandi, Varun Vij, Kwang S Kim
A key challenge in developing fuel cells is the fabrication of low-cost electrocatalysts with high activity and long durability for the two half reactions, i.e., the methanol/ethanol oxidation reaction (MOR/EOR) and the oxygen reduction reaction (ORR). Herein, we report a conductivity-enhanced bifunctional electrocatalyst of nanoscale-coated Pt-Pd alloys on both tin-doped-indium (TDI) and reduced-graphene-oxide (rGO), denoted as Pt-Pd@TDI/rGO. The mass activity of Pt in Pt-Pd@TDI/rGO hybrid toward MOR, EOR, and ORR are 2590 mA/mg, 1500 mA/mg, and 2690 mA/mg, respectively...
July 16, 2017: ACS Nano
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