Nano Letters Journal Impact Factor & Information

Publisher: American Chemical Society, American Chemical Society

Journal description

A central forum for scientists involved in nanoscale research, among a wide range of disciplines that include physical and materials chemistry, biotechnology, and applied physics. Nano Letters reports on fundamental research in all branches of the theory and practice of nanoscience and nanotechnology. It will provide rapid disclosure of the key elements of a study, publishing preliminary, experimental, and theoretical results on the physical, chemical, and biological phenomena, processes and applications of structures within the nanoscale range. Areas of interest include: Synthesis and processing of organic, inorganic, and hybrid nanosized materials by physical, chemical, and biological methods; Modeling and simulation of synthetic, assembly, and interaction processes; Characterization of unique size properties; Realization and application of novel nanostructures and nanodevices. This is the second letters journal launched by ACS, following the 1999 release of Organic Letters, and charged with the same mission: To rapidly communicate preliminary significant research results.

Current impact factor: 12.94

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 12.94
2012 Impact Factor 13.025
2011 Impact Factor 13.198
2010 Impact Factor 12.186
2009 Impact Factor 9.991
2008 Impact Factor 10.371
2007 Impact Factor 9.627
2006 Impact Factor 9.96
2005 Impact Factor 9.847
2004 Impact Factor 8.449
2003 Impact Factor 6.144
2002 Impact Factor 5.033

Impact factor over time

Impact factor

Additional details

5-year impact 14.13
Cited half-life 4.40
Immediacy index 2.47
Eigenfactor 0.37
Article influence 5.19
Website Nano Letters website
Other titles Nano letters (Online), Nano letters
ISSN 1530-6992
OCLC 44445939
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

American Chemical Society

  • Pre-print
    • Author cannot archive a pre-print version
  • Restrictions
    • Must obtain written permission from Editor
    • Must not violate ACS ethical Guidelines
  • Post-print
    • Author cannot archive a post-print version
  • Restrictions
    • If mandated by funding agency or employer/ institution
    • If mandated to deposit before 12 months, must obtain waiver from Institution/Funding agency or use AuthorChoice
    • 12 months embargo
  • Conditions
    • On author's personal website, pre-print servers, institutional website, institutional repositories or subject repositories
    • Non-Commercial
    • Must be accompanied by set statement (see policy)
    • Must link to publisher version
    • Publisher's version/PDF cannot be used
    • If mandated sooner than 12 months, must obtain waiver from Editors or use AuthorChoice
    • Reviewed on 07/08/2014
  • Classification
    ​ white

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Rechargeable magnesium batteries have lately received great attention for large-scale energy storage systems due to their high volumetric capacities, low materials cost, and safe characteristic. However, the bivalency of Mg2+ ions has made it challenging to find cathode materials operating at high voltages with decent (de)intercalation kinetics. In an effort to overcome this challenge, we adopt an unconventional approach of engaging crystal water in the layered structure of Birnessite MnO2 because the crystal water can effectively screen electrostatic interactions between Mg2+ ions and the host anions. The crucial role of the crystal water was revealed by directly visualizing its presence and dynamic rearrangement using scanning transmission electron microscopy (STEM). Moreover, the importance of lowering desolvation energy penalty at the cathode-electrolyte interface was elucidated by working with water containing non-aqueous electrolytes. In aqueous electrolytes, the decreased interfacial energy penalty by hydration of Mg2+ allows Birnessite MnO2 to achieve a large reversible capacity (231.1 mAh g-1) at high operating voltage (2.8 V vs. Mg/Mg2+) with excellent cycle life (62.5% retention after 10,000 cycles), unveiling the importance of effective charge shielding in the host and facile Mg2+ ions transfer through the cathode's interface.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01109
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    ABSTRACT: We present the first observation of Janus nanoparticles consisting of stable, co-existing ordered mesophases in discrete particles created by lipid self-assembly. Cryo-TEM images provided visual identification of the multi-compartment Janus nanoparticles and, combined with SAXS data, confirmed the presence of mixed cubic phases and mixed cubic/hexagonal phases within individual nanoparticles. We further investigated computer visualisation models to interpret the potential interface between the interconnected co-existing nanostructured domains within a single nanoparticle.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01751
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    ABSTRACT: Phased-antenna metasurfaces can impart abrupt, spatially-dependent changes to the amplitude, phase, and polarization of light and thus mold wavefronts in a desired fashion. Here we present an experimental and computational near-field study of metasurfaces based on near-resonant V-shaped antennas, and connect their near- and far-field optical responses. We show that far-fields can be obtained from limited, experimentally-obtained knowledge of the near-fields, paving the way for experimental near-field characterization of metasurfaces and other optical nanostructures and prediction of their far-fields from the near-field measurements.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00692
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    ABSTRACT: We investigate the phase-dependent excitation of localized surface plasmon polaritons in coupled nanorods by using nonlinear spectroscopy. Our design of a coupled three-nanorod structure allows independent excitation with cross-polarized light. Here, we show that the excitation of a particular plasmon mode can be coherently controlled by changing the relative phase of two orthogonally polarized light fields. Furthermore, we observe a phase relation for the excitation that is dominantly caused by damping effects.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01381
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    ABSTRACT: Transient absorption microscopy is used to examine the breathing modes of single gold nanowires in highly viscous liquids. By performing measurements on the same wire in air and liquid, the damping contribution from the liquid can be separated from the intrinsic damping of the nanowire. The results show that viscous liquids strongly reduce the vibrational lifetimes, but not to the extent predicted by standard models for nanomaterial-liquid interactions. To explain these results a general theory for compressible viscoelastic fluid-structure interactions is developed. The theory results are in good agreement with experiment, which confirms that compressible non-Newtonian flow phenomena are important for vibrating nanostructures. This is the first theoretical study and experimental measurement of the compressible viscoelastic properties of simple liquids.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00853
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    ABSTRACT: The metal-atom chains on the Si(111)-5×2-Au surface represent an exceedingly interesting system for the understanding of one-dimensional electrical interconnects. While other metal-atom chain structures on silicon suffer from metal-to-insulator transitions, Si(111)-5×2-Au stays metallic at least down to 20 K as we have proven by the anisotropic absorption from localized plasmon polaritons in the infrared. A quantitative analysis of the infrared plasmonic signal done here for the first time yields valuable band structure information in agreement to the theoretically derived data. The experimental and theoretical results are consistently explained in the framework of the atomic geometry, electronic structure, and IR spectra of the recent Kwon-Kang model.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01279
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    ABSTRACT: Here, we report on the scalable synthesis and characterization of novel architecture three-dimensional high-capacity amorphous SiNWs-based anodes, with focus on studying their electrochemical degradation mechanisms. We achieved an unprecedented combination of remarkable performance characteristics, high loadings of 3-15 mAh/cm2, a very low irreversible capacity (10% for the 3-4 mAh/cm2 anodes), current efficiency greater than 99.5%, cycle stability both in half cells and a LiFePO4 battery, a total capacity of 457mAh/cm2 over 204 cycles and fast charge-discharge rates (up to 2.7C at 20mA/cm2). These SiNWs-based binder-free 3D anodes have been cycled for over 200 cycles, exhibiting a stable cycle life. Notably, it was found that the growth of the continuous SEI layer thickness, and its concomitant increase in resistivity, represents the major reason for the observed capacity loss of the SiNWs-based anodes. Importantly, these NWs-based anodes of novel architecture meet the requirements of lithium batteries for future portable, and electric-vehicle, applications.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00744
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    ABSTRACT: Topological defects are ubiquitous in physics and include crystallographic imperfections such as defects in condensed matter systems. Defects can determine many of the material's properties thus providing novel opportunities for defect engineering. However, it is difficult to track buried defects in three dimensions with nanoscale resolution. Here we report three-dimensional visualization of gold nanocrystal twin domains using Bragg Coherent X-ray Diffractive Imaging in an aqueous environment. We capture the size and location of twin domains, which appear as voids in electron density, in addition to a component of the associated strain field. Twin domains can interrupt the stacking order of the parent crystal, leading to a phase offset between the separated parent crystal pieces. We measure the diffraction signal from the crystal twin and show its electron density fits into the parent crystal void. Defect imaging will likely facilitate improvement and rational design of nanostructured materials.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01104
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    ABSTRACT: We study with Raman spectroscopy the influences of He+ bombardment and the environment on beam-induced defects in graphene encapsulated in hexagonal boron nitride (h-BN). We show for the first time experimentally the autonomous behavior of the D' defect Raman peak: in contrast to the D defect peak, the D' defect peak is sensitive to the local environment. In particular, it saturates with ion dose in the encapsulated graphene. Electrical measurements reveal n-type conduction in the BN- encapsulated graphene. We conclude that unbound atoms ("interfacials") between the sp2-layers of graphene and h-BN promote self-healing of the beam-induced lattice damage and that nitrogen-carbon exchange leads to n-doping of graphene.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00939
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    ABSTRACT: Metallic nanowires usually exhibit ultra-high strength, but low tensile ductility owing to their limited strain hardening capability. Here we study the unique strain hardening behavior of the five-fold twinned Ag nanowires by nanomechanical testing and atomistic modeling. In situ tensile tests within a scanning electron microscope (SEM) revealed strong strain hardening behavior of the five-fold twinned Ag nanowires. Molecular dynamics simulations showed that such strain hardening was critically controlled by twin boundaries and pre-existing defects. Strain hardening was size dependent - thinner nanowires achieved more hardening and higher ductility. The size-dependent strain hardening was found to be caused by the obstruction of surface nucleated dislocations by twin boundaries. Our work provides mechanistic insights into enhancing the tensile ductility of metallic nanostructures by engineering the internal interfaces and defects.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01015
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    ABSTRACT: Surface strains in core-shell nanoparticles modify catalytic activity. Here, a continuum-based strategy enables accurate surface-strain-based screening and design of core-shell systems using minimal input as a means to enhance catalytic activity. The approach is validated here for Pt shells on Cu(X)Pt(1-X) cores and used to interpret experimental results on the oxygen reduction reaction in the same system. The analysis shows that precise control of particle sizes and shell thicknesses is required to achieve peak activity, rationalizing the limited increases in activity observed in experiments. The method is also applied to core-shell nanorods to demonstate its wide applicability.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01154
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    ABSTRACT: Effects of strain impact a range of applications involving mobility change in field-effect-transistors. We report the effect of strain fluctuation on epitaxial growth of NiSi2 in a Si nanowire via point contact and atomic layer reactions, and we discuss the thermodynamic, kinetic, and mechanical implications. The generation and relaxation of strain shown by in situ TEM is periodic and in synchronization with the atomic layer reaction. The Si lattice at the epitaxial interface is under tensile strain, which enables a high solubility of super-saturated interstitial Ni atoms for homogeneous nucleation of an epitaxial atomic layer of the disilicide phase. The tensile strain is reduced locally during the incubation period of nucleation by the dissolution of super-saturated Ni atoms in the Si lattice, but the strained-Si state returns once the atomic layer epitaxial growth of NiSi2 occurs by consuming the super-saturated Ni.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01234
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    ABSTRACT: Thin-film ultraviolet (UV) light-emitting diodes (LEDs) with emission wavelengths below 400 nm are emerging as promising light sources for various purposes, from our daily lives to industrial applications. However, current thin-film UV-emitting devices radiate not only UV light but also visible light. Here, we introduce genuine UV-emitting colloidal nanocrystal quantum dot (NQD) LEDs (QLEDs) using precisely controlled NQDs consisting of a 2.5-nm-sized CdZnS ternary core and a ZnS shell. The core size is further reduced during the shelling process via the atomic diffusion of interior Cd atoms to the exterior ZnS shell, compensating for the photoluminescence redshift. This design enables us to develop CdZnS@ZnS UV QLEDs with pure UV emission and minimal parasitic peaks. The irradiance is as high as 2.0-13.9 mW cm(-2) at the peak wavelengths of 377-390 nm, several orders of magnitude higher than that of other thin-film UV LEDs.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00392
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    ABSTRACT: Although the rechargeable lithium-sulfur battery system has attracted significant attention due to its high theoretical specific energy, its implementation has been impeded by multiple challenges, especially the dissolution of intermediate lithium polysulfide (Li2Sn) species into the electrolyte. Introducing anchoring materials, which can induce strong binding interaction with Li2Sn species, has been demonstrated as an effective way to overcome this problem and achieve long-term cycling stability and high-rate performance. The interaction between Li2Sn species and anchoring materials should be studied at the atomic level, in order to understand the mechanism behind the anchoring effect and to identify ideal anchoring materials to further improve the performance of Li-S batteries. Using first-principles approach with van der Waals interaction included, we systematically investigate the adsorption of Li2Sn species on various two-dimensional layered materials (oxides, sulfides and chlorides), and study the detailed interaction and electronic structure, including binding strength, configuration distortion and charge transfer. We gain insight on how van der Waals interaction and chemical binding contribute to the adsorption of Li2Sn species for anchoring materials with strong, medium and weak interactions. We understand why the anchoring materials can avoid the detachment of Li2S as in carbon substrate, and we discover that too strong binding strength can cause decomposition of Li2Sn species.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00367
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    ABSTRACT: We developed the novel electrode which enables fine control of overpotential by exploiting surface segregation that is the enrichment of one component at the surface of binary alloy. To realize this approach, we controlled the proportion of Si with low Li diffusivity at the surface by annealing the SiGe nanowire in H2 environment at various temperatures. The resulting SiGe nanowires annealed at 850 °C exhibited high reversible capacity (> 1031 mA·h·g-1), and long cycle life (400 cycles) with high capacity retention (89.0 %) at 0.2 C. This superior battery performance is attributed to the remaining unlithiated part acting as support frame to prevent pulverization of anode material, which results from the fine-tuning of overpotential by controlling the degree of Si segregation.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b01257
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    ABSTRACT: Self-doping of Dirac cones in Bi2X3 (X=Se, Te) topological insulators can be tuned by controlling the sequence of stacking defects in the crystal. Twin boundaries inside Bi2X3 drive n- or p-type doping of the surface states, originated by the defect induced spontaneous polarization. Doping up to 10(12)-10(13) e/cm(2) may be achieved depending on the defect distribution. Our findings open the route to fabrication of Bi2X3 surfaces with tailored intrinsic charge and spin densities.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00625
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    ABSTRACT: High-performance solar-blind (200-280 nm) avalanche photodetectors (APDs) were fabricated based on highly crystallized ZnO-Ga2O3 core-shell microwires. The responsivity can reach up to 1.3 × 10(3) A/W under -6 V bias. Moreover, the corresponding detectivity was as high as 9.91 × 10(14) cm·Hz(1/2)/W. The device also showed a fast response, with a rise time shorter than 20 μs and a decay time of 42 μs. The quality of the detectors in solar-blind waveband is comparable to or even higher than that of commercial Si APD (APD120A2 from Thorlabs Inc.), with a responsivity ∼8 A/W, detectivity ∼10(12) cm·Hz(1/2)/W, and response time ∼20 ns. The high performance of this APD make it highly suitable for practical applications as solar-blind photodetectors, and this core-shell microstructure heterojunction design method would provide a new approach for realizing an APD device.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00906
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    ABSTRACT: We investigate hot carrier propagation across graphene using an electrical nonlocal injection/detection method. The device consists of a monolayer graphene flake contacted by multiple metal leads. Using two remote leads for electrical heating, we generate a carrier temperature gradient that results in a measurable thermoelectric voltage VNL across the remaining (detector) leads. Due to the nonlocal character of the measurement, VNL is exclusively due to the Seebeck effect. Remarkably, a departure from the ordinary relationship between Joule power P and VNL, VNL ~ P, becomes readily apparent at low temperatures, representing a fingerprint of hot-carrier dominated thermoelectricity. By studying VNL as a function of bias, we directly determine the carrier temperature and the characteristic cooling length for hot-carrier propagation, which are key parameters for a variety of new applications that rely on hot-carrier transport.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00922
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    ABSTRACT: Commonly known in macroscale mechanics, buckling phenomena are now also encountered in the nanoscale world as revealed in today's cutting-edge fabrication of microelectronics. The description of nanoscale buckling requires precise dimensional and elastic moduli measurements, as well as a thorough understanding of the relationships between stresses in the system and the ensuing morphologies. Here, we analyze quantitatively the buckling mechanics of organosilicate fins that are capped with hard masks in the process of lithographic formation of deep interconnects. We propose an analytical model that quantitatively describes the morphologies of the buckled fins generated by residual stresses in the hard mask. Using measurements of mechanical properties and geometric characteristics, we have verified the predictions of the analytical model for structures with various degrees of buckling, thus putting forth a framework for guiding the design of future nanoscale interconnect architectures.
    Nano Letters 05/2015; DOI:10.1021/acs.nanolett.5b00685