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

  • Daiming Tang, Cui-Lan Ren, Ruitao Lv, Wan-Jing Yu, Peng-Xiang Hou, Ming-Sheng Wang, Xianlong Wei, Zhi Xu, Naoyuki Kawamoto, Yoshio Bando, Masanori Mitome, Chang Liu, Hui-Ming Cheng, Dmitri Golberg
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    ABSTRACT: The hollow core of a carbon nanotube (CNT) provides a unique opportunity to explore the physics, chemistry, biology and metallurgy of different materials confined in such nano-space. Here, we investigate the non-equilibrium metallurgical processes taking place inside CNTs by in situ transmission electron microscopy using CNTs as nanoscale resistively heated crucibles having encapsulated metal nanowires/crystals in their channels. Due to nanometer size of the system and intimate contact between the CNTs and confined metals, an efficient heat transfer and high cooling rates (~10^13 K/s) were achieved as a result of a flash bias pulse followed by system natural quenching, leading to the formation of disordered amorphous-like structures in iron, cobalt and gold. An intermediate state between crystalline and amorphous phases was discovered, revealing a memory effect of local short-to-medium range order during these phase transitions. Furthermore, subsequent directional crystallization of an amorphous iron nanowire formed by this method was realized under controlled Joule heating. High-density crystalline defects were generated during crystallization due to a confinement effect from the CNT and severe plastic deformation involved.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b00664
  • Yo Sub Jeong, Jin-Bum Park, Hun-Gi Jung, Jooho Kim, Xiangyi Luo, Jun Lu, Larry Curtiss, Khalil Amine, Yang-Kook Sun, Bruno Scrosati, Yun Jung Lee
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    ABSTRACT: Among many challenges present in Li-air batteries, one of the main reasons of low efficiency is the high charge overpotential due to the slow oxygen evolution reaction (OER). Here, we present systematic evaluation of Pt, Pd, and Ru nanoparticles supported on rGO as OER electrocatalysts in Li-air cell cathodes with LiCF3SO3-tetra(ethylene glycol) dimethyl ether (TEGDME) salt-electrolyte system. All of the noble metals explored could lower the charge overpotentials, and among them, Ru-rGO hybrids exhibited the most stable cycling performance and the lowest charge overpotentials. Role of Ru nanoparticles in boosting oxidation kinetics of the discharge products were investigated. Apparent behavior of Ru nanoparticles was different from the conventional electrocatalysts that lower activation barrier through electron transfer, because the major contribution of Ru nanoparticles in lowering charge overpotential is to control the nature of the discharge products. Ru nanoparticles facilitated thin film-like or nanoparticulate Li2O2 formation during oxygen reduction reaction (ORR), which decomposes at lower potentials during charge, although the conventional role as electrocatalysts during OER cannot be ruled out. Pt-and Pd-rGO hybrids showed fluctuating potential profiles during the cycling. Although Pt- and Pd-rGO decomposed the electrolyte after electrochemical cycling, no electrolyte instability was observed with Ru-rGO hybrids. This study provides the possibility of screening selective electrocatalysts for Li-air cells while maintaining electrolyte stability.
    Nano Letters 06/2015; DOI:10.1021/nl504425h
  • Bin Chen, Xiaofeng Chen, Huajian Gao
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    ABSTRACT: It is widely known that mechanical signals such as force, geometry, and substrate elasticity can be utilized by cells to regulate their structures, functions, and behaviors. However, the exact nature of the underlying mechanisms of cellular mechanosensing is still elusive. Recently, extensive experiments on cellular reorientation dynamics on a substrate under bi-axial cyclic stretches were performed, and the measured behaviors were found to be incompatible with existing theories. Here, we show that a theoretical model based on both tensile and shearing forces on focal adhesions (FAs) is capable of reproducing the new experimental data. This work provides important mechanistic insights into how behaviors of FAs can strongly affect cellular reorientation dynamics on a cyclically stretched substrate.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b02095
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    ABSTRACT: Single-molecule Förster resonance energy transfer (smFRET) has become a powerful nanoscopic tool in studies of biomolecular structures and nanoscale objects; however, conventional smFRET measurements are generally blind to distances above 10 nm thus impeding the study of long-distance phenomena. Here, we report the development of farFRET, a technique that extends the range in single-molecule FRET (smFRET) measurements beyond the 10 nm line by enhanced energy transfer using multiple acceptors. We demonstrate that farFRET can be readily employed to quantify FRET efficiencies and conformational dynamics using double-stranded DNA molecules, RecA-filament formation on single-stranded DNA and Holliday junction dynamics. farFRET allows quantitative measurements of large biomolecular complexes and nanostructures thus bridging the remaining gap to superresolution microscopy.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b01878
  • Claire van Lare, Frank Lenzmann, Marc Verschuuren, Albert Polman
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    ABSTRACT: We demonstrate an effective light trapping geometry for thin-film solar cells that is composed of dielectric light scattering nanocavities at the interface between the metal back contact and the semiconductor absorber layer. The geometry is based on resonant Mie scattering. It avoids the Ohmic losses found in metallic (plasmonic) nanopatterns and the dielectric scatterers are well compatible with nearly all types of thin-film solar cells, including cells produced using high temperature processes. The external quantum efficiency of thin-film a-Si:H solar cells grown on top of a nanopatterend Al-doped ZnO, made using soft imprint lithography, is strongly enhanced in the 550-800 nmspectral band by the dielectric nanoscatterers. Numerical simulations are in good agreement with experimental data and show that resonant light scattering from both the AZO nanostructures and the embedded Si nanostructures are important. The results are generic and can be applied on nearly all thin-film solar cells.
    Nano Letters 06/2015; DOI:10.1021/nl5045583
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    ABSTRACT: Quantum optical circuits can be used to generate, manipulate and exploit non-classical states of light to push semiconductor based photonic information technologies to the quantum limit. Here, we report the on-chip generation of quantum light from individual, resonantly excited self-assembled InGaAs quantum dots, efficient routing over length scales ≥1 mm via GaAs ridge waveguides and in-situ detection using evanescently coupled integrated NbN superconducting single photon detectors fabricated on the same chip. By temporally filtering the time-resolved luminescence signal stemming from single, resonantly excited quantum dots we use the quantum optical circuit to perform time-resolved excitation spectroscopy on single dots and demonstrate resonance fluorescence with a line-width of 10 ± 1 µeV; key elements needed for the use of single photons in prototypical quantum photonic circuits.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b01444
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    ABSTRACT: Non-crystalline semiconductor materials often exhibit hysteresis in charge transport measurements whose mechanism is largely unknown. Here we study the dynamics of charge injection and transport in PbS quantum dot (QD) monolayers in a field effect transistor (FET). Using Kelvin probe force microscopy, we measured the temporal response of the QDs as the channel material in a FET following step function changes of gate bias. The measurements reveal an exponential decay of mobile carrier density with time constants of 35 s for holes and ~10 s for electrons. An Ohmic behavior, with uniform carrier density, was observed along the channel during the injection and transport processes. These slow, uniform carrier trapping processes are reversible, with time constants that depend critically on the gas environment. We propose that the underlying mechanism is some reversible electrochemical process involving dissociation and diffusion of water and/or oxygen related species. These trapping processes are dynamically activated by the injected charges, in contrast with static electronic traps whose presence is independent of the charge state. Understanding and controlling these processes is important for improving the performance of electronic, optoelectronic, and memory devices based on disordered semiconductors.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b01429
  • Jaesung Jo, Woo Young Choi, Jung-Dong Park, Jae Won Shim, Hyun-Yong Yu, Changhwan Shin
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    ABSTRACT: Because of the "Boltzmann tyranny" (i.e., the nonscalability of thermal voltage), a certain minimum gate voltage in metal-oxide-semiconductor (MOS) devices is required for a tenfold increase in drain-to-source current. The subthreshold slope (SS) in MOS devices is, at best, 60 mV/decade at 300 K. Negative capacitance in organic/ferroelectric materials is proposed in order to address this physical limitation in MOS technology. Here, we experimentally demonstrate the steep switching behavior of a MOS device-i.e., SS ~ 18 mV/decade (much less than 60 mV/decade) at 300 K-by taking advantage of negative capacitance in a MOS gate stack. This negative capacitance, originating from the dynamics of the stored energy in a phase transition of a ferroelectric material, can achieve the step-up conversion of internal voltage (i.e., internal voltage amplification in a MOS device). With the aid of a series-connected negative capacitor as an assistive device, the surface potential in the MOS device becomes higher than the applied gate voltage, so that a SS of 18 mV/decade at 300 K is reliably observed.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b01130
  • Tomohiro Nozawa, Hiroyuki Takagi, Katsuyuki Watanabe, Yasuhiko Arakawa
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    ABSTRACT: We present the first direct observation of two-step photon absorption in an InAs/GaAs single quantum dot (QD) using photocurrent spectroscopy with two lasers. The sharp peaks of the photocurrent are shifted due to the quantum confined Stark effect, indicating that the photocurrent from a single QD is obtained. In addition, the intensity of the peaks depends on the power of the secondary laser. These results reveal the direct demonstration of the two-step photon absorption in a single QD. This is an essential result for both the fundamental operation and the realization of ultrahigh solar-electricity energy conversion in quantum dot-intermediate band solar cells.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b00947
  • Sylvia Xin Li, Weihua Guan, Benjamin Weiner, Mark A Reed
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    ABSTRACT: Solid-state nanofluidic devices have proven to be ideal systems to elucidate the physics of ionic transport at nanometer length scales. When the channel confining size approaches the Debye screening length of ions in the fluid, new transport phenomena occur, such as surface charge mediated transport and permselectivity. Although these effects have been understood for simple monovalent systems, we explore for the first time divalent nanofluidic devices, and observe striking differences including charge inversion at the solid/fluid interface. This observation has important implications in applications ranging from biology to energy storage and conversion.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b01115
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    ABSTRACT: Surface-supported molecular motors are nanomechanical devices of particular interest in terms of future nanoscale applications. However, the molecular motors realized so far consist of covalently bonded groups that cannot be reconfigured without undergoing a chemical reaction. Here we demonstrate that a platinum-porphyrin-based supramolecularly assembled dimer supported on a Au(111) surface can be rotated with high directionality using the tunneling current of a scanning tunneling microscope (STM). Rotational direction of this molecular motor is determined solely by the surface chirality of the dimer, and most importantly, the chirality can be inverted in situ through a process involving an intradimer rearrangement. Our result opens the way for the construction of complex molecular machines on a surface to mimic at a smaller scale versatile biological supramolecular motors.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b01908
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    ABSTRACT: Rh-based nanoparticles supported on a porous carbon host were prepared with tunable average sizes ranging from 1.3 to 3.0 nm. Depending on the vacuum or hydrogen environment during thermal treatment, either Rh metal or hydride is formed at nanoscale, respectively. In contrast to bulk Rh that can form a hydride phase under 4 GPa pressure, the metallic Rh nanoparticles (~2.3 nm) absorb hydrogen and form a hydride phase at pressure below 0.1 MPa, as evidenced by the presence of a plateau pressure in the Pressure-Composition-Isotherm curves at room temperature. Larger metal nanoparticles (~3.0 nm) form only a solid solution with hydrogen under similar conditions. This suggests a nanoscale effect that drastically changes the Rh-H thermodynamics. The nanosized Rh hydride phase is stable at room temperature and only desorbs hydrogen above 175 °C. Within the present hydride particle size range (1.3 - 2.3 nm), the hydrogen desorption is size dependent, as proven by different thermal analysis techniques.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b01766
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    ABSTRACT: Using dynamic cantilever magnetometry we measure an enhanced skyrmion lattice phase extending from around 29 K down to at least 0.4 K in single MnSi nanowires (NWs). Although recent experiments on two-dimensional thin films show that reduced dimensionality stabilizes the skyrmion phase, our results are surprising given that the NW dimensions are much larger than the skyrmion lattice constant. Furthermore, the stability of the phase depends on the orientation of the NWs with respect to the applied magnetic field, suggesting that an effective magnetic anisotropy, likely due to the large surface-to-volume ratio of these nanostructures, is responsible for the stabilization. The compatibility of our technique with nanometer-scale samples paves the way for future studies on the effect of confinement and surfaces on magnetic skyrmions.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b02232
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    ABSTRACT: Semiconductor quantum dot (QD) superlattices, which are periodically ordered three dimensional (3D) array structures of QDs, are expected to exhibit novel photo-optical properties arising from the resonant interactions between adjacent QDs. Since the resonant interactions such as long-range dipole-dipole Coulomb coupling and short-range quantum resonance strongly depend on inter-QD nano space, precise control of the nano space is essential for physical understanding of the superlattice which includes both of nano and bulk scales. Here, we study the pure quantum resonance in the 3D CdTe QD superlattice deposited by a layer-by-layer assembly of positively charged polyelectrolytes and negatively charged CdTe QDs. From XRD measurements, existence of the periodical ordering of QDs both in the lamination and in-plane directions, that is, the formation of the 3D periodic QD superlattice was confirmed. The lowest excitation energy decreases exponentially with decreasing the nano space between the CdTe QD layers and also with decreasing the QD size, which is apparently indicative of the quantum resonance between the QDs rather than a dipole-dipole Coulomb coupling. The quantum resonance was also computationally demonstrated and rationalized by the orbital delocalization to neighboring CdTe QDs in the superlattice.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b00335
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    ABSTRACT: To reduce Schottky-barrier-induced contact and access resistance, and the impact of charged impurity scattering on mobility in devices based on 2D transition metal dichalcogenides (TMDs), considerable effort has been put into exploring various doping techniques and dielectric engineering using high-k oxides, respectively. The goal of this work is to demonstrate a high-k dielectric that serves as an effective n-type charge transfer dopant on monolayer (ML) molybdenum disulfide (MoS2). Utilizing amorphous titanium suboxide (ATO) as the 'high-k dopant', we achieved a contact resistance of ~ 180 Ω·µm which is the lowest reported value for ML MoS2. An ON current as high as 240 µA/µm and field effect mobility as high as 83 cm(2)/V-s were realized using this doping technique. Moreover, intrinsic mobility as high as 102 cm(2)/V-s at 300 K and 501 cm(2)/V-s at 77 K were achieved after ATO encapsulation which are among the highest mobility values reported on ML MoS2. We also analyzed the doping effect of ATO films on ML MoS2, a phenomenon which is absent when stoichiometric TiO2 is used, using ab initio density functional theory (DFT) calculations which shows excellent agreement with our experimental findings. Based on the interfacial-oxygen-vacancy mediated doping effect as seen in the case of high-k ATO - ML MoS2, we propose a mechanism for the mobility enhancement effect observed in TMD-based devices after encapsulation in a high-k dielectric environment.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b00314
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    ABSTRACT: We demonstrate the directional emission of individual GaAs nanowires by coupling this emission to Yagi-Uda optical antennas. In particular, we have replaced the resonant metallic feed element of the nanoantenna by an individual nanowire and measured with the microscope the photoluminescence of the hybrid structure as a function of the emission angle by imaging the back focal plane of the objective. The precise tuning of the dimensions of the metallic elements of the nanoantenna leads to a strong variation of the directionality of the emission, being able to change this emission from backward to forward. We explain the mechanism leading to this directional emission by FDTD simulations of the scattering efficiency of the antenna elements. These results cast the first step toward the realization of electrically driven optical Yagi-Uda antenna emitters based on semiconductors nanowires.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b00565
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    ABSTRACT: The monolithic integration of InAs1-xSbx semiconductor nanowires on graphitic substrates holds enormous promise for cost-effective, high-performance and flexible devices in optoelectronics and high-speed electronics. However, the growth of InAs1-xSbx nanowires with high aspect ratio essential for device applications is extremely challenging due to Sb-induced suppression of axial growth and enhancement in radial growth. We report the realization of high quality, vertically aligned, non-tapered and ultra-high aspect ratio InAs1-xSbx nanowires with Sb composition (xsb(%)) up to ~12% grown by indium-droplet assisted molecular beam epitaxy on graphite substrate. Low temperature photoluminescence measurements show that the InAs1-xSbx nanowires exhibit bright band-to-band related emission with a distinct redshift as a function Sb composition providing further confirmation of successful Sb incorporation in as-grown nanowires. This study reveals that the GS is a more favourable platform for InAs1-xSbx nanowires that could lead to hybrid heterostructures possessing potential device applications in optoelectronics.
    Nano Letters 06/2015; DOI:10.1021/acs.nanolett.5b00411