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Nanoscale

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https://www.readbyqxmd.com/read/29345704/hierarchical-core-shell-structures-of-p-ni-oh-2-rods-mno2-nanosheets-as-high-performance-cathode-materials-for-asymmetric-supercapacitors
#1
Kunzhen Li, Shikuo Li, Fangzhi Huang, Xin-Yao Yu, Yan Lu, Lei Wang, Hong Chen, Hui Zhang
The hierarchical porous structure with phosphorus-doped Ni(OH)2 (P-Ni(OH)2) rods as the core and MnO2 nanosheets as the shell is fabricated directly by growth on a three-dimensional (3D) flexible Ni foam (NF) via a two-step hydrothermal process. As a binder-free electrode material, this unique hybrid structure exhibits excellent electrochemical properties, including an ultrahigh areal capacitance of 5.75 F cm-2 at a current density of 2 mA cm-2 and great cyclic stability without capacitance loss at a current density of 20 mA cm-2 after 10 000 cycles...
January 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29345703/controllable-colloidal-synthesis-of-anisotropic-tin-dichalcogenide-nanocrystals-for-thin-film-thermoelectrics
#2
Deqiang Yin, Yang Liu, Chaochao Dun, David L Carroll, Mark T Swihart
Tin chalcogenides have shown promise in applications including energy storage, optoelectronics, photovoltaics, and thermoelectrics. Here, we present a colloidal synthesis strategy to produce tin dichalcogenide nanocrystals (NCs) with controllable stoichiometry, vacancies, shape, and crystal structure. Compared with previously reported methods, we use less expensive precursors, such as tin(iv) chloride and sulfur or selenium powder, to produce tin(iv) chalcogenide NCs. SnS2 and SnSe2 NCs with novel NC morphologies including SnS2 nanoflowers/nanoflakes, SnSe2 nanosheets with circular and hexagonal shapes, as well as mixtures of nanospheres and nanoflakes were prepared by varying the solvents and anion precursors...
January 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29344595/quantitative-characterization-of-the-ionic-mobility-and-concentration-in-li-battery-cathodes-via-low-frequency-electrochemical-strain-microscopy
#3
D O Alikin, K N Romanyuk, B N Slautin, D Rosato, V Ya Shur, A L Kholkin
Electrochemical strain microscopy (ESM) can provide useful information on the ionic processes in materials at the local scale. This is especially important for ever growing applications of Li-batteries whose performance is limited by the intrinsic and extrinsic degradation. However, the ESM method used so far has been only qualitative due to multiple contributions to the apparent ESM signal. In this work, we provide a viable approach for the local probing of ionic concentration and diffusion coefficients based on the frequency dependence of the ESM signal...
January 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29344592/ph-responsible-fluorescent-carbon-nanoparticles-for-tumor-selective-theranostics-via-ph-turn-on-off-fluorescence-and-photothermal-effect-in-vivo-and-in-vitro
#4
Eun Bi Kang, Jung Eun Lee, Zihnil Adha Islamy Mazrad, Insik In, Ji Hoon Jeong, Sung Young Park
We developed nanoparticles comprising a photothermal dye (IR825)-loaded carbonized zwitterionic polymer [FNP-I] as "switch-on" pH-responsive fluorescence probes to sense intracellular cancer cells and for near-infrared (NIR) controllable photothermal therapy (PTT) in vivo and in vitro. The fluorescent "off" of FNP-I was activated after reaching the cancer cell environment, where the zwitterionic compartment of FNP lost its hydrophobicity to induce PTT-mediated heat release of IR825 under NIR irradiation in the tumor...
January 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340408/expanding-pore-sizes-of-zif-8-derived-nitrogen-doped-microporous-carbon-via-c60-embedding-toward-improved-anode-performance-for-the-lithium-ion-battery
#5
Jian Guan, Xiongwu Zhong, Xiang Chen, Xianjun Zhu, Panlong Li, Jianhua Wu, Yalin Lu, Yan Yu, Shangfeng Yang
Porous carbon and nanocarbons have been extensively applied as anode materials for high-energy density lithium-ion batteries (LIBs). However, as another representative nanocarbon, fullerenes, such as C60, have been scarcely utilized in LIBs because of their poor electrochemical reversibility. Herein, we designed a novel C60-embedded nitrogen-doped microporous carbon material (denoted as C60@N-MPC), which was derived from a zeolitic imidazolate framework-8 (ZIF-8) precursor, demonstrating its promising application as a superior anode material for LIB...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340406/clarifying-the-high-on-off-ratio-mechanism-of-nanowire-uv-photodetector-by-characterizing-surface-barrier-height
#6
Gaoda Li, Leixin Meng, Xiaofei Zhu, Weihao Gao, Yong Qin, Liwei Chen
The response of semiconductor nanowire UV sensors represented by ZnO nanowire UV sensor is usually explained by the adsorption and desorption of oxygen molecules, but with the great increase of these sensors' on/off ratio in recent years, this explanation is inadequate and the inner mechanism for the large on/off ratio urgently needs to be explored. Here, the distribution of carrier concentration in a ZnO nanowire is found to be determined as a function of the radius of the nanowire, using a calibrated surface photovoltage method and space charge model...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340405/modulating-interactions-between-ligand-coated-nanoparticles-and-phase-separated-lipid-bilayers-by-varying-the-ligand-density-and-the-surface-charge
#7
Xiaojie Chen, D Peter Tieleman, Qing Liang
The interactions between nanoparticles and lipid bilayers are critical in applications of nanoparticles in nanomedicine, cell imaging, toxicology, and elsewhere. Here, we investigate the interactions between nanoparticles coated with neutral and/or charged ligands and phase-separated lipid bilayers using coarse-grained molecular dynamics simulation. Both penetration and adsorption processes as well as the final distribution of the nanoparticles can be readily modulated by varying the ligand density and the surface charge of the nanoparticles...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340403/triangular-agau-pt-core-shell-nanoframes-with-a-dendritic-pt-shell-and-enhanced-electrocatalytic-performance-toward-the-methanol-oxidation-reaction
#8
Xiaoxiao Yan, Sijia Yu, Yawen Tang, Dongmei Sun, Lin Xu, Can Xue
Triangular AgAu@Pt nanoframes with a dendritic Pt shell were synthesized by employing Ag nanoprisms as sacrificial templates. Due to the unique frame-like nanostructure and ternary components, the AgAu@Pt nanoframes exhibit impressive electrocatalytic performance toward the methanol oxidation reaction with much higher activity, and better anti-poisoning capability than commercial Pt/C catalysts.
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340401/a-nanopaper-based-artificial-tongue-a-ratiometric-fluorescent-sensor-array-on-bacterial-nanocellulose-for-chemical-discrimination-applications
#9
Samira Abbasi-Moayed, Hamed Golmohammadi, M Reza Hormozi-Nezhad
In the present study, a ratiometric fluorescent sensor array as an artificial tongue has been developed on a nanopaper platform for chemical discrimination applications. The bacterial cellulose (BC) nanopaper was utilized for the first time as a novel, flexible, and transparent substrate in the optical sensor arrays for developing high-performance artificial tongues. To fabricate this platform, the hydrophobic walls on the BC nanopaper substrates were successfully created using a laser printing technology. In addition, we have used the interesting photoluminescence (PL) properties of an immobilized ratiometric probe (carbon dot-Rhodamine B (CD-RhB) nanohybrids) on the nanopaper platform to improve the visual discrimination analysis...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340400/femtosecond-laser-induced-underwater-superaerophilic-and-superaerophobic-pdms-sheets-with-through-microholes-for-selective-passage-of-air-bubbles-and-further-collection-of-underwater-gas
#10
Jiale Yong, Feng Chen, Jinglan Huo, Yao Fang, Qing Yang, Jingzhou Zhang, Xun Hou
Controlling underwater bubble behavior on a solid surface is of great research significance, particularly in extreme cases. However, the realization of artificial underwater superaerophobic or superaerophilic surfaces is still a challenge. Herein, a micro/nanoscale hierarchical rough structure was formed on polydimethylsiloxane (PDMS) surface by one-step femtosecond laser ablation. The as-prepared surface showed superhydrophobicity in air and superaerophilicity in water. Interestingly, the wettability of such a PDMS surface could be easily switched to in-air superhydrophilicity and underwater superaerophobicity once it was further irradiated by oxygen plasma because the surface chemistry changed...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340395/boosting-electrocatalytic-hydrogen-evolution-by-plasmon-driven-hot-electron-excitation
#11
Hai-Xia Zhang, Yang Li, Min-Yu Li, Huabin Zhang, Jian Zhang
High-performance catalysts for electrocatalytic and photoelectrochemical water splitting hold great promise for renewable energy conversion and storage. Herein, using porous N-doped carbon supported Au nanoparticles as catalysts, we demonstrate that the photon-induced localized surface plasmon resonance (LSPR) excitation on Au nanoparticles dramatically improves the hydrogen evolution reaction (HER), leading to a more than 4-fold increase of current and meanwhile affording a markedly decreased overpotential of 99 mV at a current density of 10 mA cm-2...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29340391/graphene-on-116-faceted-monocrystalline-anatase-nanosheet-array-for-ultraviolet-detection
#12
Yu Liu, Honglei Cai, Fangfang Wang, Jianlin Wang, Qiuping Huang, Zhengping Fu, Yalin Lu
A structure composed of a nanosheet array may trap photons, which could be used to enhance the optical response via resonances; this may be highly useful in ultraviolet (UV) detection, photocatalysis, solar cells, etc. Moreover, anatase nanosheets exposed with the active {001}, {111}, and {116} facets are promising in applications such as Li-ion battery, photocatalysis, and electrochemistry. Therefore, in this study, the {116} faceted single-crystalline anatase nanosheet array with the sheet spacing in the range of several hundred nanometers was directly grown on the transparent conductive substrates...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29337315/correction-one-step-coelectrodeposition-assisted-layer-by-layer-assembly-of-gold-nanoparticles-and-reduced-graphene-oxide-and-its-self-healing-three-dimensional-nanohybrid-for-an-ultrasensitive-dna-sensor
#13
Kumarasamy Jayakumar, María Belén Camarada, Venkataraman Dharuman, Huangxian Ju, Ramendra Sundar Dey, Yangping Wen
Correction for 'One-step coelectrodeposition-assisted layer-by-layer assembly of gold nanoparticles and reduced graphene oxide and its self-healing three-dimensional nanohybrid for an ultrasensitive DNA sensor' by Jayakumar Kumarasamy, et al., Nanoscale, 2018, DOI: 10.1039/c7nr06952a.
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29336464/edge-orientation-dependent-nanoscale-friction
#14
Hongwei Zhang, Tienchong Chang
Nanoscale friction is generally found to be a function of the contact area. However, little is known whether and how it is dependent on the contact area shape. In this study, based on molecular dynamics (MD) simulations about a rectangular graphene flake sliding on a diamond-supported graphene substrate, we show that the friction between the flake and the substrate is significantly dependent on the flake edge oriented perpendicular to the sliding direction, but less dependent on the edge along the sliding direction...
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29336463/protein-corona-in-drug-delivery-for-multimodal-cancer-therapy-in-vivo
#15
Eugenia Li Ling Yeo, Patricia Soo Ping Thong, Khee Chee Soo, James Chen Yong Kah
The protein corona is inevitably formed on nanoparticles (NPs) when they are introduced in vivo and has been associated with a reduction in targeting yield, immune recognition and rapid blood clearance, leading to poor tumor accumulation. We have recently shown that it is possible to exploit the protein corona for drug delivery by exploiting it for loading and triggering the release of a photosensitizer Chlorin e6 (Ce6) for simultaneous photodynamic (PDT) and photothermal therapy (PTT) in vitro. Here, we extended our previous in vitro studies to evaluate its effectiveness in vivo...
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29336462/cascaded-photo-potential-in-a-carbon-dot-hematite-system-driving-overall-water-splitting-under-visible-light
#16
Chang'an Liu, Yijun Fu, Yujian Xia, Cheng Zhu, Lulu Hu, Kai Zhang, Haihua Wu, Hui Huang, Yang Liu, Tengfeng Xie, Jun Zhong, Zhenhui Kang
Hematite is an earth-abundant and ubiquitous semiconductor with a suitable bandgap of 2.1 eV for solar water splitting. Unfortunately, it suffers from a low conduction band position compared to the H+/H2 potential and typically an external bias has to be applied. Here, we demonstrate carbon dot-hematite (CD-Fe2O3) nanocomposites as photocatalysts for visible-light-driven overall water splitting without any external bias or scavenger. Notably, the CD-Fe2O3 nanocomposites (carbon dots, 5 wt%) show a hydrogen evolution rate of 0...
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29336453/semimetallic-carbon-honeycombs-new-three-dimensional-graphene-allotropes-with-dirac-cones
#17
Shuaiwei Wang, Donghai Wu, Baocheng Yang, Eli Ruckenstein, Houyang Chen
Classic two-dimensional (2D) graphene possesses outstanding properties due to Dirac cone structures. When scaling up to three-dimensional (3D) structures, their high porosity and large surface-area-to-volume ratio made them have more promising engineering perspectives. However, the currently synthesized and density-functional-theory-predicted 3D graphene structures, termed as carbon honeycombs (CHCs), are metallic. Herein, we propose new families of stable semimetallic CHC structures, which have lower energies than the previous experimentally reported structure and they would be realized experimentally...
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29336452/resonant-scattering-of-green-light-enabled-by-ag-tio2-and-its-application-in-a-green-light-projection-screen
#18
Yiyang Ye, Tupei Chen, Juyuan Zhen, Chen Xu, Jun Zhang, Huakai Li
The ability to selectively scatter green light is essential for an RGB transparent projection display, and this can be achieved by a silver-core, titania-shell nanostructure (Ag@TiO2), based on the metallic nanoparticle's localized surface plasmon resonance. The ability to selectively scatter green light is shown in a theoretical design, in which structural optimization is included, and is then experimentally verified by characterization of a transparent film produced by dispersing such nanoparticles in a polymer matrix...
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29335695/synthesis-of-garlic-skin-derived-3d-hierarchical-porous-carbon-for-high-performance-supercapacitors
#19
Qing Zhang, Kuihua Han, Shijie Li, Ming Li, Jinxiao Li, Ke Ren
A three-dimensional hierarchical porous carbon is synthesized via a facile chemical activation route with garlic skin as the precursor and KOH as the activating agent. The as-obtained carbon presents a high specific surface area of 2818 m2 g-1 and a hierarchical porous architecture containing macroporous frameworks, mesopores (2-4 nm), and micropores (0.6-1.0 nm). As the electrode material for a supercapacitor, due to its unique interconnected porous structure, this garlic skin-derived carbon exhibits excellent electrochemical performance and cycling stability...
January 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/29334397/recombinant-phosphatidylserine-binding-nanobodies-for-targeting-of-extracellular-vesicles-to-tumor-cells-a-plug-and-play-approach
#20
Sander A A Kooijmans, Jerney J J M Gitz-Francois, Raymond M Schiffelers, Pieter Vader
Extracellular vesicles (EVs) are increasingly being recognized as candidate drug delivery systems due to their ability to functionally transfer biological cargo between cells. However, manipulation of targeting properties of EVs through engineering of the producer cells can be challenging and time-consuming. As a novel approach to confer tumor targeting properties to isolated EVs, we generated recombinant fusion proteins of nanobodies against the epidermal growth factor receptor (EGFR) fused to phosphatidylserine (PS)-binding domains of lactadherin (C1C2)...
January 15, 2018: Nanoscale
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