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ACS Nano

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https://www.readbyqxmd.com/read/28085266/a-ternary-alloy-substrate-to-synthesize-monolayer-graphene-with-liquid-carbon-precursor
#1
Wei Gan, Nannan Han, Chao Yang, Peng Wu, Qin Liu, Wen Zhu, Shuangming Chen, Chuanqiang Wu, Muhammad Habib, Yuan Sang, Zahir Muhammad, Jijun Zhao, Li Song
Here we demonstrate a ternary Cu2NiZn alloy substrate for controllably synthesizing monolayer graphene using a liquid carbon precursor cyclohexane via a facile CVD route. In contrast with elemental metal or bimetal substrates, the alloy-induced synergistic effects that provide an ideal metallic platform for much easier dehydrogenation of hydrocarbon molecules, more reasonable strength of adsorption energy of carbon monomer on surface and lower formation energies of carbon chains, largely renders the success growth of monolayer graphene with higher electrical mobility and lower defects...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28085255/enhancing-the-efficiency-of-silicon-based-solar-cells-by-the-piezo-phototronic-effect
#2
Laipan Zhu, Longfei Wang, Caofeng Pan, Libo Chen, Fei Xue, Baodong Chen, Leijing Yang, Li Su, Zhong Lin Wang
Although there are numerous approaches for fabricating solar cells, the silicon based photovoltaics are still the most widely used one in industry and around the world. A small increase in the efficiency of silicon based solar cell has huge economic impact and practical importance. We fabricate a silicon-based nanoheterostructure (p+-Si/p-Si/n+-Si (and n-Si)/n-ZnO nanowire (NW) array) photovoltaic device and demonstrate the enhanced device performance through significantly enhanced light absorption by NW array and effective charge carrier separation by the piezo-phototronic effect...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28085250/self-assembly-of-hierarchical-dna-nanotube-architectures-with-well-defined-geometries
#3
Tyler Dean Jorgenson, Abdul Majeed Mohammed, Deepak Kumar Agrawal, Rebecca Schulman
An essential motif for the assembly of biological materials such as actin at the scale of hundreds of microns and beyond is a network of one-dimensional fibers with well- defined geometry. Here we demonstrate the programmed organization of DNA filaments into micron-scale architectures where component filaments are oriented at pre-programmed angles. We assemble L, T and Y-shaped DNA origami junctions that nucleate two or three micron- length DNA nanotubes at high yields. The angles between the nanotubes mirror the angles between the templates on the junctions, demonstrating that nanoscale structures can control precisely how micron-scale architectures form...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28085249/enhanced-cell-capture-on-functionalized-graphene-oxide-nanosheets-through-oxygen-clustering
#4
Neelkanth Manoj Bardhan, Priyank V Kumar, Zeyang Li, Hidde L Ploegh, Jeffrey C Grossman, Angela M Belcher, Guan-Yu Chen
With the global rise in incidence of cancer and infectious diseases, there is a need for the development of techniques to diagnose, treat and monitor these conditions. The ability to efficiently capture and isolate cells and other biomolecules from peripheral whole blood for downstream analyses is a necessary requirement. Graphene oxide (GO) is an attractive template nanomaterial for such biosensing applications. Favorable properties include its two-dimensional architecture and wide range of functionalization chemistries, offering significant potential to tailor affinity towards aromatic functional groups expressed in biomolecules of interest...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28085248/robust-gold-nanoparticle-sheets-by-ligand-crosslinking-at-the-air-water-interface
#5
Irem Kosif, Katrina Kratz, Siheng Sean You, Mrinal K Bera, Kyungil Kim, Brian Leahy, Todd Emrick, Ka Yee C Lee, Binhua Lin
We report the results of crosslinking Au nanoparticle films by the Langmuir trough technique using functionalized Au NPs with norbornene-thiols16 and an aqueous soluble catalyst at the air-water interface in situ. We introduce a water soluble ruthenium benzylidene catalyst into the water subphase to generate a robust, elastic two-dimensional network of nanoparticles containing cyclic olefins in their ligand framework. The most striking feature of the crosslinked film is that the extended connectivity of the nanoparticles enables the film to preserve much of its integrity under compression and expansion, features that are absent in its non-crosslinked counterparts...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28085247/the-quarter-century-anniversary-of-carbon-nanotube-research
#6
Yan Li
No abstract text is available yet for this article.
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28085244/submolecular-electroluminescence-mapping-of-organic-semiconductors
#7
Christoph Große, Pablo Merino, Anna Rosławska, Olle Gunnarsson, Klaus Kuhnke, Klaus Kern
The electroluminescence of organic films is the central aspect in organic light emitting diodes (OLEDs) and widely used in current display technology. However, its spatial variation on the molecular scale is essentially unexplored. Here, we address this issue by using scanning tunneling microscopy (STM) and present an in-depth study of the electroluminescence from thin C60 films (<10 monolayers) on Ag(111) and Au(111) surfaces. Similar to an OLED, the metal substrate and STM tip inject complementary charge carriers that may recombine within the molecular film; however, the atomically defined charge injection by the tip enables mapping of the local electroluminescence down to the submolecular scale...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28085241/specifically-formed-corona-on-silica-nanoparticles-enhances-transforming-growth-factor-beta-1-activity-in-triggering-lung-fibrosis
#8
Zhenzhen Wang, Chunming Wang, Shang Liu, Wei He, Lintao Wang, Jingjing Gan, Zhen Huang, Zhenheng Wang, Haoyang Wei, Junfeng Zhang, Lei Dong
Corona is a layer of macromolecules formed on nanoparticle surface in vivo. It can substantially change the biological identity of nanomaterials and possibly trigger adverse responses from the body tissue. Dissecting the role of corona in the development of a particular disease may provide profound insights for understanding toxicity of nanomaterials in general. In our present study, we explored the capability of different silica nanoparticles (SiNP) in inducing silicosis in the mice lung, and analyzed the composition of coronas formed on these particles...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28067508/coherent-brightfield-microscopy-provides-the-spatiotemporal-resolution-to-study-early-stage-viral-infection-in-live-cells
#9
Yi-Fan Huang, Guan-Yu Zhuo, Chun-Yu Chou, Cheng-Hao Lin, Wen Chang, Chia-Lung Hsieh
Viral infection starts with a virus particle landing on a cell surface followed by penetration of the plasma membrane. Due to the difficulty of measuring the rapid motion of small-sized virus particles on the membrane, little is known about how a virus particle reaches an endocytic site after landing at a random location. Here, we use coherent brightfield (COBRI) microscopy to investigate early stage viral infection with ultrahigh spatiotemporal resolution. By detecting intrinsic scattered light via imaging-based interferometry, COBRI microscopy allows us to track the motion of a single vaccinia virus particle with nanometer spatial precision (<3 nm) in 3D and microsecond temporal resolution (up to 100,000 frames per second)...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28061025/optical-control-of-spin-polarization-in-monolayer-transition-metal-dichalcogenides
#10
Xi Chen, Tengfei Yan, Bairen Zhu, Siyuan Yang, Xiaodong Cui
Optical excitation could generate electrons' spin polarization in some semiconductors with the control of the field polarization. In this article, we report a series of spin-resolved photocurrent experiments on monolayer tungsten disulfide. The experiments demonstrate that the optical excitations with the same helicity could generate opposite spin polarization around the Fermi level by tuning the excitation energy. The mechanism lies in the valley-dependent optical selection rules, the giant spin-orbit coupling, and spin-valley locking in monolayer transition metal dichalcogenides (TMDs)...
January 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28081367/ordered-mesoporous-titanium-nitride-as-a-promising-carbon-free-cathode-for-aprotic-lithium-oxygen-batteries
#11
Byung Gon Kim, Changshin Jo, Jaeho Shin, Yeongdong Mun, Jinwoo Lee, Jang Wook Choi
Despite the extraordinary gravimetric energy densities, Li-O2 batteries are still facing a technological challenge; limited round trip efficiency leading to insufficient cycle life. Recently, carbonaceous electrode materials were found to be one of the primary origins of the limited cycle life, as they produce irreversible side products during discharge. A few investigations based on non-carbonaceous materials have demonstrated largely suppressed accumulation of irreversible side products but such studies have focused mainly on the materials themselves rather than delicate morphology control...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28080025/enabling-energy-efficiency-and-polarity-control-in-germanium-nanowire-transistors-by-individually-gated-nano-junctions
#12
Jens Trommer, André Heinzig, Uwe Mühle, Markus Löffler, Annett Winzer, Paul Matthias Jordan, Jürgen Beister, Tim Baldauf, Marion Geidel, Barbara Adolphi, Ehrenfried Zschech, Thomas Mikolajick, Walter M Weber
Germanium is a promising material for future very large scale integration transistors, due to its superior hole mobility. However, germanium-based devices typically suffer from high reverse junction leakage due to the low bandgap energy of 0.66 eV and therefore are characterized by high static power dissipation. In this paper, we experimentally demonstrate a solution to suppress the off-state leakage in germanium nanowire Schottky barrier transistors. Thereto, a device layout with multiple independent gates is used to induce an additional energy barrier to the channel which blocks the undesired carrier type...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28080024/direct-fabrication-of-micro-nano-patterned-surfaces-by-vertical-directional-photofluidization-of-azobenzene-materials
#13
Jaeho Choi, Wonhee Cho, Yeon Sik Jung, Hong Suk Kang, Hee-Tak Kim
Anisotropic movement of azobenzene materials (i.e., azobenzene molecules incorporated in polymer, glass, or supramolecules) has provided significant opportunities for the fabrication of micro/nanoarchitectures. The examples include circular holes, line gaps, ellipsoidal holes, and nanofunnels. However, all of the previous studies have only focused on the lateral directional movement for the structural shaping of azobenzene materials. Herein, we propose structural shaping based on a vertical directional movement of azobenzene materials...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28080023/microbial-nanoscopy-breakthroughs-challenges-and-opportunities
#14
Yves F Dufrêne
Studying the structure, properties, and interactions of microbial cells is key to understanding the functions of the microbiome. Recent advances in nanotechnology have offered new tools to probe microbes at the single-molecule and single-cell levels. In this issue of ACS Nano, Kumar et al. present an atomic force microscopy method that is capable of imaging the nanoscale organization of bacterial proteins in native, curved membranes. This study represents an important step forward in the development of nanoscopy techniques for analyzing biological systems with large curvature and vertical dimensions, such as membrane vesicles and bacterial cells...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28079365/twist-and-shout-single-molecule-mechanochemistry
#15
Hongbin Li, Gilbert C Walker
Chemical reactions can be accelerated by various means, including applied mechanical forces. If the direction of the force does not project well onto the desired reaction coordinate, then only poor acceleration is achieved. Recent developments in single polymer mechanics illustrate how to overcome this limitation, in a simple cis-trans isomerization reaction. Generalizing the approach, synthetic chemistry can be used to attach tethers to different parts of reacting molecular fragments to direct the force usefully...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28071898/abnormal-multiple-charge-memory-states-in-exfoliated-few-layer-wse2-transistors
#16
Mikai Chen, Yifan Wang, Nathan Shepherd, Chad Huard, Jiantao Zhou, L J Guo, Wei Lu, Xiaogan Liang
To construct reliable nanoelectronic devices based on emerging 2D layered semiconductors, we need to understand the charge-trapping processes in such devices. Additionally, the identified charge-trapping schemes in such layered materials could be further exploited to make multibit (or highly desirable analog-tunable) memory devices. Here, we present a study on the abnormal charge-trapping or memory characteristics of few-layer WSe2 transistors. This work shows that multiple charge-trapping states with large extrema spacing, long retention time, and analog tunability can be excited in the transistors made from mechanically exfoliated few-layer WSe2 flakes, whereas they cannot be generated in widely studied few-layer MoS2 transistors...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28005326/synergistic-effects-of-plasmonics-and-electron-trapping-in-graphene-short-wave-infrared-photodetectors-with-ultrahigh-responsivity
#17
Zefeng Chen, Xinming Li, Jiaqi Wang, Li Tao, Mingzhu Long, Shi-Jun Liang, Lay Kee Ang, Chester Shu, Hon Ki Tsang, Jian-Bin Xu
Graphene's unique electronic and optical properties have made it an attractive material for developing ultrafast short-wave infrared (SWIR) photodetectors. However, the performance of graphene SWIR photodetectors has been limited by the low optical absorption of graphene as well as the ultrashort lifetime of photoinduced carriers. Here, we present two mechanisms to overcome these two shortages and demonstrate a graphene-based SWIR photodetector with high responsivity and fast photoresponse. In particular, a vertical built-in field is employed in the graphene channel for trapping the photoinduced electrons and leaving holes in graphene, which results in prolonged photoinduced carrier lifetime...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28075560/multilayer-grown-ultrathin-nanostructured-gaas-solar-cells-as-a-cost-competitive-materials-platform-for-iii-v-photovoltaics
#18
Boju Gai, Yukun Sun, Haneol Lim, Huandong Chen, Joseph Faucher, Minjoo L Lee, Jongseung Yoon
Large-scale deployment of GaAs solar cells in terrestrial photovoltaics demands significant cost reduction for preparing device-quality epitaxial materials. Although multilayer epitaxial growth in conjunction with printing-based materials assemblies has been proposed as a promising route to achieve this goal, their practical implementation remains challenging owing to the degradation of materials properties and resulting nonuniform device performance between solar cells grown in different sequences. Here we report an alternative approach to circumvent these limitations and enable multilayer-grown GaAs solar cells with uniform photovoltaic performance...
January 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28075559/one-component-supramolecular-filament-hydrogels-as-theranostic-label-free-magnetic-resonance-imaging-agents
#19
Lye Lin Lock, Yuguo Li, Xinpei Mao, Hanwei Chen, Verena Staedtke, Renyuan Bai, Wang Ma, Ran Lin, Yi Li, Guanshu Liu, Honggang Cui
Gadolinium (Gd)-based compounds and materials are the most commonly used magnetic resonance imaging (MRI) contrast agents in the clinic; however, safety concerns associated with their toxicities in the free ionic form have promoted the development of new generations of metal-free contrast agents. Here we report a supramolecular strategy to convert an FDA-approved anticancer drug, Pemetrexed (Pem), to a molecular hydrogelator with inherent chemical exchange saturation transfer (CEST) MRI signals. The rationally designed drug-peptide conjugate can spontaneously associate into filamentous assemblies under physiological conditions and consequently form theranostic supramolecular hydrogels for injectable delivery...
January 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28075558/immunological-principles-guiding-the-rational-design-of-particles-for-vaccine-delivery
#20
Katelyn T Gause, Adam K Wheatley, Jiwei Cui, Yan Yan, Stephen J Kent, Frank Caruso
Despite the immense public health successes of immunization over the past century, effective vaccines are still lacking for globally important pathogens such as human immunodeficiency virus, malaria, and tuberculosis. Exciting recent advances in immunology and biotechnology over the past few decades have facilitated a shift from empirical to rational vaccine design, opening possibilities for improved vaccines. Some of the most important advancements include (i) the purification of subunit antigens with high safety profiles, (ii) the identification of innate pattern recognition receptors (PRRs) and cognate agonists responsible for inducing immune responses, and (iii) developments in nano- and microparticle fabrication and characterization techniques...
January 11, 2017: ACS Nano
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