Nanoscience and Nanotechnology Letters

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.

  • Impact factor
    1.44
  • 5-year impact
    0.89
  • Cited half-life
    1.60
  • Immediacy index
    0.31
  • Eigenfactor
    0.00
  • Article influence
    0.21
  • Website
    Nanoscience and Nanotechnology Letters
  • ISSN
    1941-4900
  • Document type
    Journal

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Tris(8-hydroxyquinolinato) aluminium (Alq3) based top-gate-type organic light emitting-transistors (OLETs) have been fabricated by using a simple solution process. The OLET consists of a bulk layer of indium-tin oxide (ITO) and hole injection layer of poly(2,3-dihydrothieno-1,4-dioxin)–poly(styrenesulfonate) (PEDOT:PSS) as an anode (source), organic electroluminescent layer of Alq3 and aluminium (Al) as cathode (drain) and gate. A Current–voltage–luminance (J–V–L) characteristic of the OLETs shows that the current density is depended on polarity of gate bias. Initial internal electric field contributes to the charge diffusion between gate and cathode channel. A vice versa characteristic observed for luminance at cathode–anode and gate–anode channels.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: A series of red phosphors, Y2O2S: Eu3+ nanocrystals were prepared by the molten salt method with NaCl as the molten salt at lower temperature. Their crystal structure and morphology were characterized by powder X-ray diffraction, scanning electron microscopy. The excitation and emission of these red phosphors were investigated at room temperature. The particles size of Y2O2S: Eu3+ can be controlled by adjusting the different kinds of surfactants, such as Polyoxyethylene (9) nonyl phenyl ether (NP-9), polyoxyethylene (5) nonyl phenyl-ether (NP-5), sodium Lauryl Ether Sulfate (SLES), octyl phenol together ethylene (10) ether oxygen (OP-10) and sodium dodecyl benzene sulfonate (LAS). The Y2O2S: Eu3+ nanocrystals prepared with NP-9 shows regular morphology and higher crystallinity, and its average particle size is about 100 nm. This phosphor shows intense red emission under UV light excitation, and bright red light can be observed by naked eyes from the red phosphor under 365 nm excitation. The red LED based on this red phosphor shows intense red emission under 20 mA current excitation.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: Insoluble acetylene black (AB) nanoparticles were successfully dispersed into 0.02 M HAc in the presence of chitosan (CTS). By solvent evaporation, an AB-CTS composite film-modified glassy carbon electrode (GCE) was prepared. The electrochemical behaviors of salvianolic acid B were studied. Compared with the unmodified GCE, the CTS-modified GCE increased the oxidation peak currents of salvianolic acid B by 93%, while the AB-CTS composite film-modified GCE further enhanced by about 31-fold. The influences of pH value, amount of AB-CTS, accumulation potential and time on the oxidation signals of salvianolic acid B were studied. Based on the strong signal amplification effects of AB-CTS composite film, a highly-sensitive electrochemical method was newly developed for the determination of salvianolic acid B. The linear range was from 2.5 to 500 nM, and the detection limit was 1 nM. The newly-developed method was demonstrated with salvia miltiorrhiza samples, and the results were in good agreement with the values that obtained by high-performance liquid chromatography.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: This paper describes a method based on electrospinning using a novel dual-spinneret to fabricate Janus-type nanofiber with thermoelectric p–n heterostructure. Co3O4/TiO2 composite nanofibers were synthesized after calcining the precursor composite fibers with Janus-type morphology, as confirmed by X-ray diffraction and transmission electron microscopy. Scanning electron microscopy images show that the diameter of the Co3O4/TiO2 composite ceramic fiber is in the range of 300–1000 nm, the surface of both precursor and ceramic fibers are smooth, and the diameter is uniform across their length. Energy dispersive spectroscopy demonstrated that the Co3O4/TiO2 composite nanofibers are formed by combining n-type TiO2 in one side with p-type Co3O4 in the other side, with the p–n junction formed at the interface of the Janus-type nanofiber. The novel Janus-type structure could find a variety of applications as a p–n junction in nanoscale thermoelectric devices.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: The anatase titanium dioxide microspheres modified with fluorine loading on the surface of graphene oxide, defined as F-TiO2/GO, was successfully prepared via a facile one-step homogeneous precipitation method. Here, (NH4)2TiF6 was used both as the titanium and fluorine source, CO(NH2)2 as the precipitant, high-surface area graphene oxide as the 2D photocatalyst support. The F-TiO2/GO hybrid was employed as a photocatalyst for visible-light-driven, and displayed high photocatalytic degradation activity on methyl orange.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: We demonstrate a facile one-step route to synthesize polypyrrole (PPy)/graphene oxide (GO) nanocomposite sponges. PPy nanoparticles and GO nanosheets are self-assembled into a well-defined and interconnected three-dimensional porous network through – interaction during the static polymerization of pyrrole monomers in the presence of GO nanosheets. PPy nanoparticles with the size range of 30–70 nm are uniformly dispersed on the GO surface in the three-dimensional network. The effect of GO nanosheets concentration on the water absorbency of the PPy/GO nanocomposite sponge was investigated. The results show that PPy/GO nanocomposite sponges possess improved water absorbency in distilled water as well as in saline solution. The as-prepared PPy/GO nanocomposite sponge may be a potential candidate in the fields of tissue engineering, biosensors, and controlled release.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: Superparamagnetic monodisperse Fe3O4/graphene oxide (GO) nanocomposite was successfully synthesized for the first time by a facile one-pot solvothermal synthesis using FeCl3·6H2O as the iron resource, ethylene glycol (EG) as the reaction solvent, NaHCO3 as the precipitant and adding a little amount of GO suspension solution to EG solvent, which was characterized by X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Brunauer–Emmett–Teller (BET) test, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), and Vibrating sample magnetometer (VSM) methods, and its adsorption capacity of Pb(II) by the atomic absorption spectrophotometer (AAS) was investigated. The results showed that the solvothermal treatment time played an important role to particle size and magnetic properties of as-prepared Fe3O4 particles. Highly uniform-sized, well-crystallized, spherical Fe3O4 nanoparticles with a diameter of ca. 60 nm were conveniently prepared at 200 °C for 5 hour, which showed a saturation magnetization (M s ) of 49.8 emu·g–1. During the preparation of Fe3O4/GO nanocomposite, addition of a little amount of GO suspension solution to EG reaction solvent can significantly improve the particle dispersibility and obviously decrease the particle size of as-prepared Fe3O4 nanoparticles, which were less than 20 nm in the diameter and were near monodisperse, and the graphene oxide in Fe3O4/GO nanocomposite had been partially reduced. Fe3O4/GO nanocomposite exhibited a superparamagnetic behavior with M s of 41.8 emu · g–1, and can significantly improve the adsorption capacity of Pb(II) than the one of pure Fe3O4 nanoparticles, and it was promising in the application of heavy metals wastewater treatment.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: We report a successful fabrication of tungsten disulfide micro-nanostructures with different morphologies including sphere-like, band-like, and flower-like ones via a simple yet facile hydrothermal process by using the cetyltrimethyl ammonium bromide (CTAB) as surfactant. The structural features of the as-prepared WS2 are characterized systematically by the X-ray powder diffraction and scanning electron microscopy. We find that the CTAB surfactant plays a critical role in producing three-dimensional WS2 structures with different morpholoigies. We also propose growth mechanisms for the three-dimensional WS2 micro-nanostructures with different morphologies. Such simple method is applicable to other metal chalcogenides materials with various morphologies.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: An Integrated approach of molecular dynamics (MD) is proposed in this work to model the nano-manufacturing drilling phenomenon of Boron Nitride Nanosheet (BNN) panels. An Integrated approach consists of nano scale modeling using MD simulation and a computational intelligence approach comprising of a general regression neural network, which was specifically designed to formulate the machining force and time models for studying the output features of BNN panel with respect to process temperature, feed and rotational velocity of drill bit. We find that our integrated MD model is able to model the drilling process of BNN panel very well, and the results are in well agreement with the experimental data. The sensitivity and parametric analysis is conducted, which validates the robustness of our proposed model by unveiling hidden dominant input parameters and non-linear relationships of drilling of BNN panel. It was found that the rotation velocity has the highest influence on the machining force and time in drilling of BNN panel.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: BaWO4:Eu3+ red phosphors were synthesized by the hydrothermal method at 180 °C for 20 h. The X-ray diffraction pattern and Fourier transform infrared spectroscopy spectrum show that BaWO4:Eu3+ phosphors have a scheelite phase. The excitation spectrum includes a broad band arising from the Eu—O and W—O charge transfers and some sharp peaks originating from f–f transitions of Eu3+ ions. In the emission spectrum, the 5D0 → 7FJ transitions (J = 1, 2, 3 and 4) can be seen clearly. But the band emissions caused by WO2–4 groups are not observed, suggesting a complete energy transfer from WO2–4 to Eu3+. The dopant concentration of Eu3+ ions has influences on the luminescence and lifetime of BaWO4:Eu3+ red phosphors. The critical quenching concentration of Eu3+ ions in this phosphor is about 8 mol%.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: This paper proposes a fast locking Delay-Locked-Loop (DLL) with background timing skew calibration. By using the reverse conducting property of MOSFET in charge pump, the proposed architecture reduces the locking time while the complexity of the circuit remains unchanged. In addition, a self-calibration algorithm for timing skew based on charge pump is designed. It detects the timing skew by capacitor through charge pump and compensates the timing errors adaptively in background. The proposed DLL is designed in a 65 nm CMOS process. The post-layout simulation shows that the locking time is reduced from 592 ns to 77 ns. The maximum timing skew is minimized from 34 ps to 2 ps. The rms jitter and peak-to-peak jitter are 0.63 ps and 3.18 ps, respectively.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: In this letter, we present a K a -band to W-band (47-GHz to 94-GHz) millimeter wave frequency doubler realized in 65-nm low power CMOS technology. The proposed W-band frequency multiplier features a conversion gain of about 2 dB at 0 dBm K a -band input signal power with a 10.6% –3 dB bandwidth from 88.7-GHz to 98.7-GHz. The maximum saturated output power to a 50-Ohm load is about 2.5-dBm. The suppression of the unwanted harmonics is more than 85-dBc. The DC power consumption of the proposed design is only 9.6 mW under a single 1.2-V supply.
    Nanoscience and Nanotechnology Letters 12/2014; 6(12).
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    ABSTRACT: Surface damage of electrodes caused by collapsing gas bubbles is of high importance in electrochemistry because it greatly affects the electrolytic process. To obtain insight into electrode surface damage due to bubble collapse in an electrolytic environment, electrolysis experiments were performed with glass electrodes coated with relatively thin (40 nm) and thick (200 nm) Au films. To facilitate real-time observation of bubble formation and collapse, the Au film surfaces were coated with a hydrophilic alkanethiol self-assembled monolayer (SAM). Bubble nucleation and growth on the SAM-coated Au surfaces were accomplished by applying a dc voltage with a probe tip. In-situ microscopy and real-time recording showed that film failure due to bubble collapse occurred by two different damage mechanisms, depending on the thickness and surface roughness of the Au film. The thin and smoother Au films initially exhibited localized damage followed by delamination due to collapsing bubbles forming by the coalescence of smaller bubbles, whereas the thick and rougher Au films exhibited localized surface damage due to multiple-bubble collapse. The obtained results are interpreted in the context of heterogeneous bubble nucleation, and differences in electrode damage patterns are attributed to film roughness and thickness effects on bubble nucleation, growth, and coalescence.
    Nanoscience and Nanotechnology Letters 11/2014; 6(11).
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    ABSTRACT: In this paper, Mn doped SnO nanomaterial is studied both experimentally and theoretically. Hexagonal-shaped Mn-doped SnO nanostructures are successfully synthesized by the simple template-free hydrothermal method. All theoretical results are calculated using ADF-BAND 2012.01. The experimental and the theoretical results prove the ferromagnetism of Mn doped SnO. The morphology, crystalline phase, particle sizes and atomic weight percentage of atoms are investigated by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and energy-dispersive X-ray spectroscopy (EDS), respectively. FESEM results show that the sheets-like SnO structure are in the range of 10 μm and the average size of nano-hexagonal plates is about 100 nm. The average crystalline size of the tetragonal phase SnO particles is calculated to be about 25 nm from XRD results. Two Raman active modes A 1g = 205 cm–1 and B1g = 106 cm–1 and about 7 cm–1 redshift are observed by the Raman spectroscopy. The experimental results are consistent with theoretical results.
    Nanoscience and Nanotechnology Letters 11/2014; 6(11).
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    ABSTRACT: A novel approach has been invented to prepare efficient electrocatalysts for methanol oxidation. The approach involves electrochemical reduction of adsorption of metal ions instead of free ions in solution. The results showed that the deposited Pt–Ru particles are very thin nanoplatelets, the prepared electrocatalyst has a large electrochemically active surface area and its Pt mass activity toward methanol oxidation reaction is about 10 times higher than that of the commercial catalyst. The novel approach could provide an effective method for solving the problem of low electrocatalytic activity in direct methanol fuel cell anodes.
    Nanoscience and Nanotechnology Letters 11/2014; 6(11).
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    ABSTRACT: We report the role of a double stage heat treatment process for the synthesis of novel GaN nanostructures (NSs) using a two stage furnace following a catalyst free vapour–solid growth mechanism. Morphological analysis revealed that GaN NSs were composed of rod-like structures with average diameter of 250 nm and accumulated particulates of GaN with diameter of ∼12–16 nm providing enhanced surface area, which will be important when GaN is used as a catalyst support. The wurtzite phase of GaN nanorods of agglomerated nanoclusters was synthesized at temperatures as low as 750 °C. An X-ray photoelectron spectroscopic study confirmed formation of GaN. The surface areas of the GaN NSs were high at ∼20 m2/g with respect to that expected for solid nanorod structures. The GaN NSs were of high crystallinity and purity as revealed by structural studies. Raman spectral analysis showed stronger intensity of the A 1 (LO) mode with respect to that for E 2(high) mode indicating the good electronic quality of the sample. A photoluminescence study revealed the dominant presence of a defect band around 1.7–2.1 eV corresponding to nitrogen di-vacancies. Subsequent annealing in NH3 has demonstrated a compensation of the defect state and evolution of band edge peak with possible hydrogen compensation of surface states.
    Nanoscience and Nanotechnology Letters 11/2014; 6(11).
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    ABSTRACT: Zeolites NaX were prepared by a hydrothermal method and the influences of crystallization temperature on the end products were investigated. The samples synthesized were characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy and particle size analysis. The results indicated that the products synthesized 25 and 40 °C were composed of many closely packed nanocrystals with the average size of around 30 nm, while the products obtained at 60 °C exhibited slightly larger nanocrystal sizes. The average crystal particle sizes prepared at 25, 40 and 60 °C were measured to be 265, 298 and 602 nm, with their distributions in the ranges of 150–360, 178–420 and 352–794 nm, respectively. Higher crystallization temperature favoured the aggregation of individual nanocrystals, which resulted in the formation of larger steady congregated agglomerates. However, the products synthesized at high temperature (95 °C) were big single crystals. The reasons may be attributed to the dominant nucleation due to much slower diffusion rates and crystal growth kinetics at low temperatures.
    Nanoscience and Nanotechnology Letters 11/2014; 6(11).