Nanoscale (Nanoscale )

Description

Impact factor 6.74

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    Impact factor
  • 5-year impact
    6.26
  • Cited half-life
    1.70
  • Immediacy index
    1.17
  • Eigenfactor
    0.03
  • Article influence
    1.60
  • ISSN
    2040-3372

Publications in this journal

  • Xiang Liu, Nianze Liu, Mingju Liu, Zhi Tao, Wen-Jian Kuang, Xiangbing Ji, Jing Chen, Wei Lei, Qing Dai, Chi Li, Xuehua Li, Arokia Nathan
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    ABSTRACT: Graphene nanomesh (GNM)-based optoelectronics integrated with quantum dots(QDs) is investigated in this article. The charge transfer mechanism in the QDs/GNM interface is probed in the four terminals gated FET-type photodetectors. And the insulating ligand was used to make the GNM/ligand/QDs vertically behave like a metal/insulate/semiconductor (MIS) structure to facilitate the charge tunnelling. With the current constraint effect of the GNM and the effective charge tunnelling, a high-performance photodetector is fabricated with higher responsivity, higher on/off ratio and shorter response time. Our analysis result and experimental approach can be extended to future Graphene-based photodetectors as long as suitable ligands or effective device architecture is chosen for this kind of device.
    Nanoscale 01/2015;
  • Gyeonghee Lee, Chakrapani V Varanasi, Jie Liu
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    ABSTRACT: It is well known that both the structural morphology and chemical doping are important factors that affect the properties of metal hydroxide materials in electrochemical energy storage devices. In this work, an effective method to tailor the morphology and chemical doping of metal hydroxides is developed. It is shown that the morphology and the degree of crystallinity of Ni(OH)2 can be changed by adding glucose in the ethanol-mediated solvothermal synthesis. Ni(OH)2 produced in this manner exhibited an increased specific capacitance, which is partially attributed to its increased surface area. Interestingly, the effect of morphology on cobalt doped-Ni(OH)2 is found to be more effective at low cobalt contents than at high cobalt contents in terms of improving the electrochemical performance. This result reveals the existence of competitive effects between chemical doping and morphology change. These findings will provide important insights to design effective materials for energy storage devices.
    Nanoscale 01/2015;
  • Minli You, Junjie Zhong, Yuan Hong, Zhenfeng Duan, Min Lin, Feng Xu
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    ABSTRACT: Patterning of upconversion luminescent materials has been widely used for anti-counterfeit and security applications, where the preferred method should be easy, fast, multicolor, high-throughput and designable. However, conventional patterning methods are complex and inflexible. Here, we report a digital and flexible inkjet printing based approach for producing high-resolution and high-luminescence anti-counterfeit patterns. We successfully printed different multicolor luminescent patterns by inkjet printing of upconversion nanoparticles with controlled and uniform luminescence intensity through optimizing the inks and substrates. Combined with another downconversion luminescent material, we achieved two different patterns in the same area, which show up separately under excitation by different wavelength laser sources. The developed technology is promising to use one single substrate for carrying abundant information by printing multilayer patterns composed of luminescent materials with different excitation light sources.
    Nanoscale 01/2015;
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    ABSTRACT: Research on graphene—monolayers of carbon atoms arranged in a honeycomb lattice—is proceeding at a relentless pace as scientists of both experimental and theoretical bents seek to explore and exploit its superlative attributes, including giant intrinsic charge mobility, record-setting thermal conductivity, stiffness, and strength. Of course, fully exploiting the remarkable properties of graphene requires reliable, large-scale production methods which are non-oxidative and introduce minimal defects, criteria not fully satisfied by any known approach. A major advance in this direction is ionic liquid-assisted exfoliation of graphite, leading to the isolation of few- and single-layered graphene sheets with yields of two orders of magnitude higher than the earlier liquid-assisted exfoliation approaches using surface energy-matched solvents such as N-methyl-2-pyrrolidone. In this review, we the use of ionic liquids employed in methods emerging for the practical exfoliation, dispersion, and modification of graphene nanosheets. These developments lay the foundation for strategies seeking to overcome the challenges faced by current liquid-phase exfoliation approaches, enjoying direct extrapolation to inorganic graphene analogues as well.
    Nanoscale 01/2015;
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    ABSTRACT: The DNA-mediated self-assembly of CdSe/CdS quantum rods (QRs) onto DNA origami is described. Two QR types with unique optical emission and high polarization were synthesized, and then functionalized with oligonucleotides (ssDNA) using a novel protection-deprotection approach, which harnessed ssDNA's tailorable rigidity and denaturation temperature to increase DNA coverage by reducing non-specific coordination and wrapping. The QR assembly was programmable, and occurred at two different assembly zones that had capture strands in parallel alignment. QRs with different optical properties were assembled, opening up future studies on orientation dependent QR FRET. The QR-origami conjugates could be purified via gel electrophoresis and sucrose gradient ultracentrifugation. Assembly yields, QR stoichiometry and orientation, as well as energy transfer implications were studied in light of QR distances, origami flexibility, and conditions.
    Nanoscale 01/2015;
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    ABSTRACT: Molybdenum disulphide has been touted as a good material with diverse possible applications such as an energy storage and sensing platform. However, we demonstrate here the limitation of MoS2 as an analytical sensing platform due to the limited potential window in both the anodic and cathodic regions attributed to the inherent electrochemistry (oxidation of Mo4+ to Mo6+) and the catalytic hydrogen evolution reaction due to H3O+ reduction on the MoS2 surface, respectively. The electrochemical window of MoS2 lies in the region of –0.6 V to +0.7 V (vs. AgCl). We show that such a limited working potential window characteristic of MoS2 precludes the detection of important analytes such as nitroaromatic explosives, pesticides and mycotoxins which are instead detectable on carbon surfaces. The limited potential window of MoS2 has to be taken into consideration in the construction of electroanalytical devices based on MoS2.
    Nanoscale 01/2015;
  • Yajing Chen, Zhichao Xiong, Lingyi Zhang, Jiaying Zhao, Quanqing Zhang, Li Peng, Weibing Zhang, Mingliang Ye, Hanfa Zou
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    ABSTRACT: Highly selective and efficient capture of glycosylated proteins and peptides from complex biological samples is of profound significance for the discovery of disease biomarkers in biological systems. Recently, hydrophilic interaction liquid chromatography (HILIC)-based functional materials have been extensively utilized for glycopeptide enrichment. However, the low amount of immobilized hydrophilic groups on the affinity material has limited its specificity, detection sensitivity and binding capacity in the capture of glycopeptides. Herein, a novel affinity material was synthesized to improve the binding capacity and detection sensitivity for glycopeptides by coating a poly(2-(methacryloyloxy)ethyl)-dimethyl-(3-sulfopropyl) ammonium hydroxide (PMSA) shell onto Fe3O4@SiO2 nanoparticles, taking advantage of reflux-precipitation polymerization for the first time (denoted as Fe3O4@SiO2@PMSA). The thick polymer shell endows the nanoparticles with excellent hydrophilic property and several functional groups on the polymer chains. The resulting Fe3O4@SiO2@PMSA demonstrated an outstanding ability for glycopeptide enrichment with high selectivity, extremely high detection sensitivity (0.1 fmol), large binding capacity (100 mg g(-1)), high enrichment recovery (above 73.6%) and rapid magnetic separation. Furthermore, in the analysis of real complicated biological samples, 905 unique N-glycosylation sites from 458 N-glycosylated proteins were reliably identified in three replicate analyses of a 65 μg protein sample extracted from mouse liver, showing the great potential of Fe3O4@SiO2@PMSA in the detection and identification of low-abundance N-linked glycopeptides in biological samples.
    Nanoscale 01/2015;
  • Babak Behnam Azad, Sangeeta Ray Banerjee, Mrudula Pullambhatla, Silvia lacerda, Catherine Foss, Yuchuan Wang, Robert Ivkov, MG Pomper
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    ABSTRACT: Early detection enables improved prognosis for prostate cancer (PCa). A promising target for imaging and therapy of PCa is the prostate-specific membrane antigen (PSMA), which exhibits both high expression within epithelium of PCa cells, and becomes internalized upon ligand binding. Here we report the synthesis of a PSMA-targeted bionized nanoferrite (BNF) nanoparticle and its biological evaluation in an experimental model of PCa. The BNF nanoparticle formulation exhibits properties conducive to targeted imaging such as stealth, prolonged circulation time and enhanced clearance from non-target sites. Optical imaging of the targeted BNF in vivo indicates preferential accumulation in PSMA+ tumors 4 h post-injection, suggesting target specificity. On the other hand, while non-targeted nanoparticles exhibit lower uptake but similar accumulation in both PSMA+ and PSMA- tumors, indicating target specificity. Imaging with single photon emission computed tomography (SPECT) and biodistribution studies of a modified construct indicate highest tumor accumulation at 48 h post-injection [4.3 ± 0.4 percentage injected dose per gram of tissue (%ID/g)], with tumor/blood and tumor/muscle ratios of 7.5 ± 2.4 and 11.6 ± 1.2 %ID/g, respectively. Ex vivo fluorescence microscopy, Prussian blue staining, immunohistochemistry and biodistribution studies confirm enhanced nanoparticle uptake in PSMA+ tumors compared to those not expressing PSMA. The BNF nano-formulation described is promising for PSMA-targeted imaging applications in vivo.
    Nanoscale 01/2015;
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    ABSTRACT: Herein, a cascaded chemiluminescence resonance energy transfer (C-CRET) process was demonstrated from horseradish peroxidase (HRP)-mimicking DNAzyme-catalyzed luminol-H2O2 to fluorescein and further to graphene oxide (GO) when HRP-mimicking DNAzyme/fluorescein was in a close proximity to GO surface. The proposed C-CRET system was successfully implemented to construct three modes of C-CRET hot-spot-active substrate (modes I, II and III) by covalently immobilizing HRP-mimicking DNAzyme/fluorescein-labeled hairpin DNAs (hot-spot-generation probes) on magnetic GO (MGO), resulting in a signal “off” state due to the quenching of luminol/H2O2/HRP-mimicking DNAzyme/fluorescein CRET system by GO. Upon the introduction of microRNA-122 (miRNA-122), the targets (mode I) or the new triggers generated through strand displacement reaction (SDR) initiated by miRNA-122 (modes II and III) hybridized with the loop domains of hairpin probes on MGO to form double-stranded (modes I and II) or triplex-stem structure (mode III), causing an “open” configuration of hairpin probe and a CRET signal “on” state, achieving sensitive and selective detection of miRNA-122. More importantly, the substrate exhibited excellent controllability, reversibility and reproducibility through SDR and magnetic separation (modes II and III), especially sequence-independence for hairpin probes in mode III, holding great potential for the development of versatile platform for optical biosensing.
    Nanoscale 01/2015;
  • Danqing Liu, Lei Wang, Shenghua Ma, Zhaohua Jiang, Bin Yang, Xiaojun Han, Shaoqin Liu
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    ABSTRACT: In this work, the highly oriented CdS-coated-ZnO nanorod arrays have been fabricated. The CdS-coated-ZnO nanorod arrays show high electrochemiluminescent intensity, fast response and good stability. All of the desirable properties spur development of an ECL immuosensor for detection of liver cancer cell line (HepG2 cells). Two successive modification steps of 3-aminopropyltriethoxysilane and gold nanoparticles onto the CdS-coated-ZnO nanorod arrays not only offer the substrates for conjugation of antibody, but also effectively enhance the ECL signal, resulting in production of the high performance ECL immuosensor. The ECL immuosensor exhibits sensitive response to HepG2 cells in a linear range of 300-10000 cells/mL with a detection limit of 256 cells/mL. The proposed sensor characteristic of high specificity, good reproducibility and remarkable stability will provide a sensitive, selective, and convenient approach for clinical detection of cancer cells.
    Nanoscale 01/2015;
  • Jiang Zhou, Ying Huang, Xiehong Cao, Bo Ouyang, Wenping Sun, Chaoliang Tan, Yu Zhang, Qinglang Ma, Shuquan Liang, Qingyu Yan, Hua Zhang
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    ABSTRACT: We report the synthesis of two-dimensional (2D) NiCo2O4 nanosheet-coated three-dimensional graphene network (3DGN), which is then used as an electrode for high-rate, long-cycle-life supercapacitors. Using the 3DGN and nanoporous nanosheets, an ultrahigh specific capacitance (2173 F g(-1) at 6 A g(-1)), excellent rate capability (954 F g(-1) at 200 A g(-1)) and superior long-term cycling performance (94% capacitance retention after 14 000 cycles at 100 A g(-1)) are achieved.
    Nanoscale 01/2015;
  • Changlong Chen, Jonathon W Moir, Navid Soheilnia, Benoit Mahler, Laura Hoch, Kristine Liao, Veronika Hoepfner, Paul O'brien, Chen-Xi Qian, Le He, Geoffrey Ozin
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    ABSTRACT: Nanotower- and nanowall-like indium oxide structures were grown directly on fluorine-doped tin oxide (FTO)/In2O3 seeded substrates and pristine FTO substrates, respectively, by a straightforward solvothermal method. The tower-like nanostructures are proposed to form via a self-assembly process on the In2O3 seeds. The wall-like nanostructures are proposed to form via epitaxial growth from the exposed edges of SnO2 crystals of the FTO substrate. The nanotowers and nanowalls reveal highly crystalline and ordered nanocrystals with preferred orientations in the [111] and [110] directions, respectively. The two structures display remarkably different activities when used as photoanodes in solar light-driven water splitting. X-ray photoelectron spectroscopy results suggest an increased density of hydroxyl groups in the nanowalls, which results in a decrease in the work function and a concomitant shift in the onset potential of photocurrent in the linear sweep voltammograms, which is further confirmed by Mott-Schottky and flat-band potential measurements, indicating the importance of hydroxyl content in determining the photoelectrochemical properties of the films. Morphology-controlled, nanostructured transparent conducting oxide electrodes of the kind described in this communication are envisioned to provide valuable platforms for supporting catalysts and co-catalysts that are intentionally tailored for efficient light-assisted oxidation of water and reduction of carbon dioxide.
    Nanoscale 01/2015;
  • Chao Zhang, Fenglong Wang, Chunhui Dong, Cunxu Gao, Chenlong Jia, Changjun Jiang, Desheng Xue
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    ABSTRACT: We report non-volatile electric-field control of magnetism modulation in Fe/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (PMN-PT) heterostructure by fabricating an epitaxial Fe layer on PMN-PT substrate using molecular beam epitaxy technique. The remnant magnetization with different electric field shows a non-symmetric looplike shape, which demonstrates a change of interfacial chemistry and a large magnetoelectric coupling in Fe/PMN-PT at room temperature to realize low loss multi-state memory under electric field. Fitting with the angular-dependence of in-plane magnetization reveals that the magnetoelectric effect is dominated by the direct electric-field-effect rather than the strain effect at the interface. The magnetoelectric effect and the induced surface anisotropy are found to be dependent on the Fe film thickness and linear with respect to the applied electric field.
    Nanoscale 01/2015;
  • Chuanxu Ma, Haifeng Sun, Hongjian Du, Jufeng Wang, Aidi Zhao, Qunxiang Li, Bing Wang, J G Hou
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    ABSTRACT: We present an investigation of the structural and electronic properties of an ordered grain boundary (GB) formed by separated pentagon-heptagon pairs in single-layer graphene/SiO2 using scanning tunneling microscopy/spectroscopy (STM/STS), coupled with density functional theory (DFT) calculations. It is observed that the pentagon-heptagon pairs, i.e., (1,0) dislocations, form a periodic quasi-one-dimensional chain. The (1,0) dislocations are separated by 8 transverse rows of carbon rings, with a period of ∼2.1 nm. The protruded feature of each dislocation shown in the STM images reflects its out-of-plane buckling structure, which is supported by the DFT simulations. The STS spectra recorded along the small-angle GB show obvious differential-conductance peaks, the positions of which qualitatively accord with the van Hove singularities from the DFT calculations.
    Nanoscale 01/2015;
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    ABSTRACT: Hybrid materials remain the target for a fruitful range of investigations, especially for energy devices. A number of hybrid electrolyte membranes consisting of inorganic and organic phases were then synthesized. Mechanical, solvent uptake and ionic transport properties were studied with the key point being the characteristic length scale of the interaction between the phases. A group of nanocomposite membranes made of polystyrenesulfonic acid-grafted silica particles embedded in a Poly(Vinylidene Fluoride-co-HexaFluoroPropene) (PVdF-HFP) matrix was studied by combining neutron and X-ray scatterings on the nanometer to angstrom scale. This approach allows for the variation in the morphology and structure as a function of particle loading to be described. These studies showed that the particles aggregate with increasing particle loading and these aggregates swell, creating a physical interaction with the polymer matrix. Particle loadings lower than 30 wt% induce a slight strain between both of the subphases, namely the polymer matrix and the particles. This strain is decreased with particle loading between 20 and 30 wt% conjointly with the beginning of proton conduction. Then the percolation of the aggregates is the beginning of a significant increase of the conduction without any strain. This new insight can give information on the variation in other important intrinsic properties.
    Nanoscale 01/2015;
  • Chenghang You, Xiaoyuan Zeng, Xiaochang Qiao, Fangfang Liu, Ting Shu, Jianhuang Zeng, Li Du, Shijun Liao
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    ABSTRACT: A high-performance N-doped carbon catalyst with fog-like, fluffy structure was prepared through pyrolyzing the mixture of polyacrylonitrile, melamine and iron chloride. The catalyst exhibits excellent oxygen reduction reaction (ORR) performance, with a half-wave potential 27 mV more positive than that of commercial Pt/C catalyst (-0.120 vs. -0.147 V) and a higher diffusion-limiting current density than that of Pt/C (5.60 vs. 5.33 mA cm–2) in an alkaline medium. Moreover, it also shows outstanding methanol tolerance, remarkable stability and nearly 100% selectivity for the four-electron ORR process. To our knowledge, it is one of the most active doped carbon ORR catalysts in alkaline media to date. By comparing catalysts derived from the precursors containing different amounts of melamine, we found that the added melamine not only gives the catalyst fluffy structures but also modifies the N content and the distribution of N species in the catalyst, which we believe to be the origins for the catalyst’s excellent ORR performance.
    Nanoscale 01/2015;