Nanoscience and Nanotechnology Letters

Publisher: American Scientific Publishers

Journal description

Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.

Current impact factor: 1.43

Impact Factor Rankings

2015 Impact Factor Available summer 2016
2014 Impact Factor 1.431
2013 Impact Factor 1.444
2012 Impact Factor 0.886
2011 Impact Factor 0.528

Impact factor over time

Impact factor

Additional details

5-year impact 1.25
Cited half-life 2.50
Immediacy index 0.12
Eigenfactor 0.00
Article influence 0.20
Website Nanoscience and Nanotechnology Letters
ISSN 1941-4900
Document type Journal

Publisher details

American Scientific Publishers

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  • Classification

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Pure polyvinyl alcohol (PVOH or PVA) and composite PVOH and gold nanofibers were electrospun to form nonwoven mats. Aqueous solutions of the PVOH and gold nanoparticles were blended at various concentrations to achieve viscous solutions suitable for the electrospinning process. The concentrations were varied to obtain sub-micron and nanoscale fiber mats. Fiber mat morphology was analyzed using scanning electron microscopy (SEM). Gold nanoparticle content was verified using thermal gravimetric analysis (TGA) and Transmission Electron Microscopy (TEM). Gold nanoparticle size was measured using TEM and verified using Ultraviolet-Visible (UV-Vis) spectroscopy. The bulk chemistry and surface chemistry was analyzed using Fourier Transform Infra-red (FTIR) spectroscopy and contact angle analysis. The fiber morphology, chemical compositions and contact angle data show that these electrospun materials are suitable for applications including biosensing, biomedical and tissue engineering.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):718-722. DOI:10.1166/nnl.2015.2026
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    ABSTRACT: A novel oxide p-n heterojunction structure with n-type ZnO nanorods embedded in p-type CuO thin film was fabricated on an indium tin oxide-coated glass substrate by combining a hydrothermal synthesis method and a sputtering deposition method. The transport behavior and NO gas sensing properties of the p-CuO thin film/n-ZnO nanorods heterostructure were characterized. The oxide heterojunction structure exhibited a definite rectifying diode-like behavior at various temperatures ranging from room temperature to 250 °C. Forward current-voltage (I-V ) data revealed that the conduction under high forward bias becomes space-charge-limited and follows I ≈ V 1.9. When the oxide p-n heterojunction structure was exposed to the acceptor gas NO in dry air, an abrupt decrease in the forward diode current of the p-n junction was observed. The NO gas sensing response of the oxide heterojunction structure showed a maximum value at a comparatively low operating temperature of 180 °C and increased linearly with increasing NO gas concentration in the range of 5-30 ppm. Results indicate that the p-CuO thin film/n-ZnO nanorods heterostructure has significant potential applications for oxide electronics, including gas sensors.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):758-762. DOI:10.1166/nnl.2015.2022
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    ABSTRACT: A birnessite-type manganese oxide (MnO2) with a lamellar structure was synthesized by a one-step chemical precipitation progress, using Na2O2 not only as the oxidizing reagent, but also as the source of the OH- ions. The prepared MnO2 was successfully employed as an active electrode material for a supercapacitor and displayed high specific capacitance, superior cycling performance and excellent rate capability. These results show that the prepared MnO2 nanostructure can be recognized as a promising candidate for supercapacitor applications.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):749-753. DOI:10.1166/nnl.2015.1789
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    ABSTRACT: We report a novel single-step method for preparing noble Au nanoparticles by the electrical explosion of wires (EEW) in deionized (DI) water without any additives. The morphologies and compositions of the as-prepared powders were observed by field emission-scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS). The sizes and lattice images of the particles were analyzed using high-resolution transmission electron microscopy (HR-TEM). The dispersion properties of the nanoparticles in DI water were evaluated using sedimentation photographs, a Turbiscan device, and zeta-potential measurements. The nanoparticles were typically spherical with a particle size of approximately 150 nm, depending on the explosion conditions. The as-prepared Au particles were not contaminated in the DI water during evaporation and condensation of the explosion process and exhibited extremely good crystallinity. The dispersion of Au nanoparticles obtained using 0.1 mm wire was stable for six months in DI water at both room temperature and at 40°C.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):697-702. DOI:10.1166/nnl.2015.2018
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    ABSTRACT: Zinc oxide nanoparticles (ZnO NPs) are widely used in industry and cosmetic products with promising investment in medical diagnosis and treatment. However, these particles may reveal high potential risk for human health with little information is available about their toxicity. The present study was carried out to investigate the ultrastrcutural alterations induced in the hepatic tissues by ZnO NPs. Male Wistar albino rats were exposed to ZnO NPs at a daily dose of 2 mg/kg for 21 days. Furthermore, liver biopsies from all rats under study were subjected and processed for transmission electron microscopy and ultrastructural examination. Exposure to ZnO NPs has induced the following ultrastructural alterations: sinusoidal dilatation, Kupffer cells enlargement and activation, mitochondrial crystolysis and swelling, endoplasmic reticulum dilatation and vesiculation, myelin figures formation, karyopyknosis, nuclear membrane irregularity, chromatin fragmentation and glycogen depletion. These findings may suggest that ZnO NPs can induce ultrastructural alterations in the hepatic tissues resulted from disturbance of the pro-oxidant/antioxidant system leading to cellular alterations and affecting the liver functions. The results raise the concerns about the safety associated with ZnO NPs applications and highlight on the need to elucidate probable nanotoxicity that might be induced by these particles in the vital organs.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):763-769. DOI:10.1166/nnl.2015.2028
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    ABSTRACT: Heterojunctions of Bi2O2CO3 and B22MoO6 were synthesized via a one-pot hydrothermal method using urea as a morphology mediator. The phase structures and morphologies were measured by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The as-prepared Bi2O2CO3/B22MoO6 composite was assembled by many nanoparticles, forming a novel mesh-like nanostructure. The investigation on the degradation of Rhodamine B (Rh B) under the visible light illumination revealed that the Bi2O2CO3/B22MoO6 composite exhibited higher photocatalytic activity than single phase B22MoO6. The enhanced photocatalytic performance can be attributed to the formation of heterojunction interface in Bi2O2CO3/B22MoO6 which facilitates the transfer and separation of photogenerated electron- hole pairs.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):691-696. DOI:10.1166/nnl.2015.1989
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    ABSTRACT: Undoped and Co-doped NiO thin films were synthesized via a simple solvothermal route. The undoped NiO thin film sensor exhibited responses of approximately 144-216% to 0.5-10 ppm of NO2 at 250 °C. In contrast, the Co-doped NiO thin film sensor showed responses of approximately 206-722% to 0.5-10 ppm of NO2 at 250 °C. Therefore, the NO2 gas sensing performance of the NiO thin film sensor was enhanced remarkably by Co doping. Both the undoped and Co-doped NiO thin film sensors showed selectivity for NO2 gas over other gases. The underlying mechanism of the enhanced NO2 gas sensing of NiO thin films by Co-doping can be explained based on a combination of a surface depletion mechanism and a potential barrier-controlled carrier transport mechanism related to the Co3O4-NiO junction as well as a catalytic mechanism.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):713-717. DOI:10.1166/nnl.2015.2021
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    ABSTRACT: In this work, magnetic Fe3O4 nanoparticles were prepared through chemical co-precipitation and used for naringinase immobilization. Magnetic particles were characterized through transmission electron microscopy, Fourier transform infrared spectroscopy, hysteresis loop, and X-ray diffraction analyses. Immobilization was investigated by determining enzyme concentration, glutaraldehyde concentration, immobilization time, temperature, pH, and oscillation speed. Results showed that Fe3O4 nanoparticles exhibited a size of about 15 nm and decreased saturation magnetization value after immobilization. Enzyme activity recovery increased to 31.9% when 0.35 mg/mL enzyme and 3% glutaraldehyde were mixed at pH 5.0 and 28 °C for 4 h. The optimal temperature and pH of naringinase were not affected by immobilization. Naringinase-Fe3O4 nanoparticles exhibited higher pH stability than free nanoparticles, but the temperature stability of naringinase decreased after immobilization. The Michaelis constant (Km) indicated that immobilized enzyme presented lower affinity to the binding substrate than free enzymes. The residual enzyme activity was retained at 83% after eight reuse cycles, and immobilized naringinase preserved more than 78% of its original activity after storage for 60 d at 4 °C.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):770-778. DOI:10.1166/nnl.2015.2029
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    ABSTRACT: We report the synthesis of uniform and smooth Cu2ZnSnS4 (CZTS) thin films on glass and Mo/Si substrates by a simple single-step chemical bath deposition (CBD) method with an appropriate combination of complexing agents. Effects of triethanolamine (TEA) and ammonium hydroxide (NH4OH), used as complexing agents and PH stabilizers, on CZTS deposition were systematically investigated. Higher concentration (7 M) and moderate volume (1 ml) of TEA showed uniform and smooth film with a relatively fast growth rate. With increased concentration of NH3 from 2 M to 14 M, film thickness continuously increased because of enhanced heterogeneous growth rate rather than homogeneous precipitation. Based on the results, an appropriate CBD growth mechanism of CZTS film was suggested. The resulting CZTS films were characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, photoluminescence and UV-Visible spectroscopy analyses. CZTS thin film, sulfurized at 500 °C, showed a Kesterite crystal structure with an optimum bandgap energy of ∼1.4 eV.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):729-733. DOI:10.1166/nnl.2015.2023
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    ABSTRACT: Two nanostructured ferritic alloys (NFAs) are produced in order to investigate the effect of the processing time of the mechanical alloying (MA) on the microstructural evolution and tensile properties. The microstructural evolution with the MA processing time is examined using small angle neutron scattering and transmission electron microscope analyses, which demonstrate that the number density of nanoclusters below 10 nm increases significantly and their mean diameter decreases as the MA time increases. The nano-sized particles are characterized using A-ratio calculations. The NFA sample mechanically alloyed for 120 hours reaches a high tensile strength of ∼1320 MPa, while the NFA sample with a shorter MA time exhibits only ∼800 MPa. The reason for the difference in the tensile strength is also discussed.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):754-757. DOI:10.1166/nnl.2015.2017
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    ABSTRACT: The sandwich films composed of aluminum ions doped zinc oxide (AZO)/silver (Ag)/aluminumdoped zinc oxide (AZO) films were prepared by RF magnetron sputtering using the powder targets at room temperature. The morphology and crystallinity, as well as the optical and electrical properties of the as-synthesized films were examined by using different characterization equipments, including X-ray diffraction, Atomic force microscopy, UV-visible spectrophotometer and the Hall-effect measurement. The XRD patterns indicate the existence of the polycrystalline structure with the preferred orientations of ZnO (002) and Ag (111). The AZO/Ag/AZO films have dense columnar structures according to the images captured by the atomic force microscopy. The transmittance of the film at 550 nm is ∼85% reflected in the UV-visible spectra. The charge carrier concentration and mobility, the resistivity and the sheet resistance of the tri-layer film is about 3.6×1022/cm3, 9.0 cm2/Vs, 1.9×10-5 ω cm, and 2-6 ω/sq, respectively. The AZO/Ag/AZO film has great promises in the industrial applications as transparent electrodes.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):743-748. DOI:10.1166/nnl.2015.2027
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    ABSTRACT: In recent years, nanodiamonds (NDs) have been investigated as a promising candidate for drug delivery carrier due to a high biocompatibility and excellent physicochemical properties. However, uncontrolled aggregation of the as-prepared NDs often hinders their practical application. In this work, we report an effective drug delivery system based on the NDs through deaggregation and carboxylation for cancer cell therapy. The deaggregated NDs were responsible for enhanced dispersion stability and larger specific surface area. The subsequent carboxylation of the NDs sufficiently provided a strong chemical bonding between the NDs and doxorubicin (DOX) with high conjugation degree. The carboxylated ND-DOX conjugates showed a higher suppression ratio of Huh7 cell proliferation and the effect was remarkable at a longer incubation time, comparing to the free DOX and as-received ND-DOX conjugates. It is thus expected that the ND-based drug delivery system with a superior therapeutic efficacy can dramatically reduce essential dose of drugs and side effects for cancer cell therapy.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):723-728. DOI:10.1166/nnl.2015.2020
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    ABSTRACT: ZnO and Zn-Ni-O nanoparticles, 50 to 200 nm in size, were synthesized for sensor applications via a simple solvothermal route. The Zn-Ni-O nanoparticle sensor showed significantly enhanced CO gas sensing performance compared to the ZnO nanoparticle sensor. ZnO and Zn-Ni-O nanoparticle sensors showed responses to 5-100 ppm of CO at 275 °C of approximately 145-320% and 174-916%, respectively. The Zn-Ni-O nanoparticle sensor also showed a faster response to CO gas than the ZnO nanoparticle sensor. Both the ZnO and Zn-Ni-O nanoparticle sensors showed selectivity for CO gas over other gases, and the latter showed higher selectivity. Moreover, the optimal operating temperature of the Zn-Ni-O nanoparticle sensor was lower than that of the ZnO nanoparticle sensor by 25 °C. The enhanced response, shorter response time and enhanced selectivity of the Zn-Ni-O nanoparticle sensor for CO compared to those of the ZnO nanoparticle sensor were attributed to the existence of p-n heterojunctions in the former, which induces an extension of the depletion layer and modulates electrical conduction.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):703-707. DOI:10.1166/nnl.2015.2014
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    ABSTRACT: We investigated the structural and electrical characteristics of graphene after O2 plasma treatment and H2 annealing, and we further studied the effects of these treatments on the device performance of AlGaN/GaN Schottky diodes. Raman spectroscopy revealed that increasing O2 plasma power during treatment enhanced the D-band to G-band intensity ratio. Atomic force microscopy and X-ray photoelectron spectroscopy revealed variation in surface morphology and a shift in carbon and oxygen binding energies, respectively, which correlated an increase in the sheet resistance of graphene. The current-voltage (I-V ) characteristics of AlGaN/GaN Schottky diodes demonstrated degradation of electrical properties after O2 plasma treatment. After H2 annealing, the I-V curves of Schottky diodes recovered due to improvement in the structural and electrical properties of graphene damaged during O2 plasma treatment.
    Nanoscience and Nanotechnology Letters 09/2015; 7(9):708-712. DOI:10.1166/nnl.2015.2015
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    ABSTRACT: In this paper, we present a facile, fast and cost effective synthesis of patterned ZnO microwires using anodic aluminum oxide template for large scale fabrication of high output piezoelectric-generator. Traditionally top-down lithography route is adopted for the synthesis of ZnO patterned microwires. The lithography equipment are expensive and wafer fabrication process is too slow; therefore it cannot be recommended for industrial application. We introduced a bottom-up approach using anodic aluminum template for the synthesis of patterned ZnO microwires while low temperature hydrothermal route is adopted for the synthesis of ZnO microwires. The electrical values of the piezoelectric-generator, open-circuit voltage output is about 4–6 mV and short-circuit current output is nearly 0.5–1 μA. The grown ZnO microwires have been characterized using XRD, SEM, TEM and EDX.
    Nanoscience and Nanotechnology Letters 08/2015; 7(8):623-629. DOI:10.1166/nnl.2015.1987
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    ABSTRACT: The elastic properties of three types of tubular nanostructures, carbon, boron nitride and silicon carbide nanotubes, are studied and compared based on the atomic-scale finite element method. Tersoff-Brenner potential is used to describe the interaction between atoms, and the computational method is established in an atomic-scale scheme similar to the classical finite element method. The Young's modulus is evaluated for these nanotubes, and their buckling behavior are analyzed. It is shown that these nanotubes have similar elastic properties, that is that, the diameter has an obvious influence on the Young's modulus, and the buckling is little related to the length of the nanotubes.
    Nanoscience and Nanotechnology Letters 08/2015; 7(8):648-654. DOI:10.1166/nnl.2015.2006
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    ABSTRACT: The devices were fabricated with the structure of ITO/m-MTDATA (20 nm)/NPB(10 nm)/DPAVBi: Rubrene (z%, 20 nm)/Alq3(30 nm)/LiF(0.5 nm)/Al (100 nm) by the vacuum evaporation method. The doped concentration of z was fixed at 2, 5, 8 and 10, and the thickness of emitting layer DPAVBi: Rubrene was 20 nm. The luminance and the current efficiency of the devices were studied by adjusting the different doping concentrations. The results show that the yellow organic light-emitting diodes had a maximum current efficiency of 3.56 cd/A and maximum luminance of 23150 cd/m2 at 11.5 V when the doping concentration was 5%. And the color coordinates was near (0.48, 0.50), closing to the standard yellow light.
    Nanoscience and Nanotechnology Letters 08/2015; 7(8):661-664. DOI:10.1166/nnl.2015.2024
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    ABSTRACT: Noble metal nanostructures showed unique physical and chemical properties due to their intrinsic structural characteristics, especially for Au nanostructures. In order to manipulate Au nanostructures with desired shapes, a facile hydrothermal method was used in this study. HAuCl4 was reduced by DMF or other solvent in presence of capping regent to prepare the Au nanostructures with the shape of decahedron, truncated decahedron, nanoplate and so on. A perfect decahedron has been obtained and was systematically characterized. In addition, the effects of HAuCl4 concentration and capping reagent to the process were investigated.
    Nanoscience and Nanotechnology Letters 08/2015; 7(8):685-689. DOI:10.1166/nnl.2015.2011