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Jiabing Yu, Tingwei Li, Ge Nie, Bo-Ping Zhang, Qiang Sun
Motivated by the recent experimental exfoliation of β-Cu2S thin films and the theoretical finding of a new phase labeled the δ-Cu2S monolayer, we carried out extensive studies on thermal conductivity and thermoelectric properties of the new phase using first principles combined with Boltzmann transport theory, focusing on the analysis of group velocities, Gruneisen parameters, three-phonon scattering rates, and the scattering phase space. Our results show that the δ-Cu2S monolayer exhibits an intrinsically ultralow lattice thermal conductivity of 0...
May 17, 2019: Nanoscale
Xu Yan, Miao Yu, Seeram Ramakrishna, Stephen J Russell, Yun-Ze Long
Electrospinning and electrospun fibrous assemblies have attracted interest in a variety of biomedical fields including woundcare, tissue engineering and drug delivery, due to the large surface-area-to-volume ratio and high porosity of nanofibrous webs. Normally, wound dressings are manufactured well before the point of care, and then packaged and distributed for use at a later stage. More recently, in situ electrospinning of fibers directly onto wound sites has been proposed as a route to personalized wound dressing manufacture, tailored to the needs of individual patients...
May 17, 2019: Nanoscale
Zonglin Gu, Wei Song, Serena H Chen, Baoyu Li, Weifeng Li, Ruhong Zhou
Structural defects in nanomaterials can alter their physical and chemical properties including magnetization, electronic and thermal conductivities, light absorption, and emission capabilities. Here, we investigated the potential impact of these defects on their biological effects through molecular dynamics simulations. By modeling the interaction between a graphene nanosheet and a widely used model protein, the chicken villin headpiece subdomain (HP35), we observed severe protein denaturation upon contact with defective graphene, while the protein remained intact on ideal graphene...
May 17, 2019: Nanoscale
Carsten Sprodowski, Karina Morgenstern
We follow the decay of two-dimensional Ag nanoclusters, called islands, on Cu-Ag core-shell supports by variable low temperature scanning tunneling microscopy in the temperature range between 160 and 260 K. We reveal two qualitatively different types of decay mechanisms, either linear in time, indicative of an interface-limited decay, or non-linear in time, indicative of diffusion-limited decay. In contrast to conventional decay on monometallic supports, the decay exponent of the diffusion-limited decay depends on temperature; it varies by one order of magnitude...
May 17, 2019: Nanoscale
S Premkumar, Kaushik Kundu, Siva Umapathy
The thermal and moisture instabilities of pure organic lead halide perovskites are the foremost concerns towards the commercialization of perovskite solar cells, which can be avoided by introducing an inorganic cation, such as cesium ion (Cs+) at the A-site of the perovskite crystals. In this report, the impacts of substituted Cs+ cations on the inherent properties such as microstructures, morphology, and photophysics of pure methylammonium lead bromide (MAPbBr3) perovskites have been investigated. Successful formation of mixed MA1-xCsxPbBr3 phases (with 0 ≤ x ≤ 1...
May 17, 2019: Nanoscale
Jacopo Stefano Pelli Cresi, Maria Chiara Spadaro, Sergio D'Addato, Sergio Valeri, Stefania Benedetti, Alessandro Di Bona, Daniele Catone, Lorenzo Di Mario, Patrick O'Keeffe, Alessandra Paladini, Giovanni Bertoni, Paola Luches
The coupling with plasmonic metal nanoparticles (NPs) represents a promising opportunity to sensitize wide band gap oxides to visible light. The processes which come into play after the excitation of localized surface plasmon resonances (LSPRs) in the NPs largely determine the efficiency of the charge/energy transfer from the metal NP to the oxide. We report a study of plasmon-mediated energy transfer from mass-selected silver NPs into the cerium oxide matrix in which they are embedded. Femtosecond transient absorption spectroscopy is used to probe the dynamics of charge carrier relaxation after the excitation of the LSPR of the silver nanoparticles and to evaluate the plasmon-mediated electron transfer efficiency from the silver nanoparticles to the cerium oxide...
May 17, 2019: Nanoscale
H Joisten, A Truong, S Ponomareva, C Naud, R Morel, Y Hou, I Joumard, S Auffret, P Sabon, B Dieny
Biocompatible suspended magneto-elastic membranes were prepared. They consist of PDMS (polydimethylsiloxane) films, with embedded arrays of micrometric magnetic pillars made with lithography techniques. For visible light wavelengths, our membranes constitute magnetically tunable optical diffraction gratings, in transmission and reflection. The optical response has been quantitatively correlated with membrane structure and deformation, through optical and magneto-mechanical models. In contrast to the case of planar membranes, the diffraction patterns measured in reflection and transmission vary very differently upon magnetic field application...
May 16, 2019: Nanoscale
Tomoyuki Kamata, Dai Kato, Osamu Niwa
Carbon materials containing nitrogen have been extensively studied as electrode materials for use in non-platinum cathodes of fuel cells due to their high electrocatalytic activity for oxygen reduction. The activity is strongly dependent on the structure of surface nitrogen-containing functional groups. Carbon film containing nitrogen is also suitable for analytical applications because of its low background noise and its electrocatalytic activity, which is superior to that of pure carbon film. Here, we fabricated sputter-deposited nanocarbon film with a nitrogen-containing group and estimated the efficacy of a surface nitrogen-containing group for detecting biomolecules...
May 16, 2019: Nanoscale
Chengxiang Huang, Chen Hao, Zhaochun Ye, Saisai Zhou, Xiaohong Wang, Linli Zhu, Jingbo Wu
In this paper, the rational design and synthesis of ZIF-8-derived ternary ZnO/ZnCo2O4/NiO wrapped by nanosheets is introduced. Polyhedral ternary ZnO/ZnCo2O4/NiO composites surrounded by nanosheets with different compositions are successfully fabricated through in situ growth on ZIF-8 templates and subsequent thermal annealing in air. Electrochemical investigation reveals that when the molar ratio of nickel nitrate to cobalt nitrate is 1, the composite material is more outstanding, which shows a high specific capacitance of 1136...
May 15, 2019: Nanoscale
Zhen Zhang, Chuanhao Tang, Libo Zhao, Li Xu, Wei Zhou, Zaizai Dong, Yuqing Yang, Qiqi Xie, Xiaohong Fang
Tumor-derived exosomes have emerged as promising cancer biomarkers and attracted increasing interest in non-invasive cancer diagnosis and treatment monitoring. However, the identification and quantification of exosomes in clinical samples such as blood remains challenging due to the difficulty in trade-off between recognition specificity and isolation efficiency. Here we have developed an aptamer-based fluorescence polarization assay for exosome quantification, which is a separation-free, amplification-free and sensitive approach enabling direct quantification of exosomes in human plasma...
May 15, 2019: Nanoscale
Wenyao Zhen, Shangjie An, Wei Wang, Yang Liu, Xiaodan Jia, Chao Wang, Mengchao Zhang, Xiue Jiang
At present, increasing attention is being paid to photothermal therapy corresponding to the second near infrared (NIR-II) range (1000-1700 nanometers); however, its biomedical applications related to carbon-based nanomaterials (CNMs) have always been limited by the large-scale fabrication of excellent diagnostic probes with a suitable size and optical absorption cross-section. Herein, we successfully prepared Bi@C nanoparticles with a suitable size and high output (3.14 g per patch) through a one-pot hydrothermal method...
May 15, 2019: Nanoscale
Fei Liu, Yuyun Chen, Ying Liu, Jianchun Bao, Min Han, Zhihui Dai
As one class of important electroactive materials, layered double-hydroxide (LDH) nanostructures show great promise for application in the fields of electrocatalysis, secondary batteries, and supercapacitors. Nonetheless, the synthesis of ultrathin multi-metallic-based LDH nanosheets or related nanohybrids (NHs) remains a challenge, and their supercapacitive performances need to be further improved for achieving both high energy and high power densities. Herein, ultrathin and modified NiCoAl-LDH (m-LDH) nanosheets and N-doped reduced graphene oxide (NRG) NHs were synthesized by an alkaline etching of pre-synthesized ultrathin NiCoAl-LDH nanosheets, followed by electrostatic assembly with NRG...
May 15, 2019: Nanoscale
Shuai Wang, Bin Shen, Han-Lin Wei, Zixiao Liu, Zhigang Chen, Yong Zhang, Yan Su, Jun-Zheng Zhang, Haifang Wang, Qianqian Su
Nd3+-doped nanoparticles involving 808 nm excitation hold great promise in various biomedical applications, such as bioimaging, biodetection, theranostics and optogenetics. Here we present the synthesis and characterization of core-multishell Nd3+-doped nanoparticles displaying excellent optical properties. We systematically studied the influence of doping concentration, nanostructure design, excitation wavelength and size effect on the upconversion luminescence of Nd3+-doped nanoparticles. Remarkably, the emission intensity of optimized nanoparticles with 808 nm excitation is three times higher than the emission intensity of those with 980 nm excitation...
May 15, 2019: Nanoscale
Na Yang, Xingxiang Ji, Juanjuan Sun, Yu Zhang, Qinghua Xu, Yingjuan Fu, Hongguang Li, Menghua Qin, Zaiwu Yuan
Developing actuators with multi-responsibility, large deformation, and predefined shapes is critical for the application of actuators in the field of artificial intelligence. Herein, we report the preparation of a new type of unimorph actuators containing phenol-formaldelyde resin (PFR) and graphene oxide (GO) using the chiral nematic structure of cellulose nanocrystals (CNCs) as the template. The so-obtained PFR/GO films have a unimorph structure with an asymmetric distribution of GO across the film. They exhibit synchronous responses of both photonic properties and actuation to humidifying/dehumidifying...
May 15, 2019: Nanoscale
Mengyu Chang, Meifang Wang, Yeqing Chen, Mengmeng Shu, Yajie Zhao, Binbin Ding, Zhiyao Hou, Jun Lin
The plasmonic cerium vanadate (CeVO4) semiconductor and plasmonic silver (Ag) metal exhibit a localized surface plasmon resonance (LSPR) effect in the visible (Vis)-light region; however, weak absorption in the near-infrared (NIR) region restricts their environmental remediation and biomedical application. Herein, CeVO4/Ag nanohybrids with self-assembled heterostructure and improved Vis/NIR light absorption were synthesized from CeVO4 nanosheets and AgNO3 solution, which could serve as potential solar-driven catalytic agents and near-infrared (NIR) light responsive anticancer agents...
May 15, 2019: Nanoscale
Liangna He, Yiliang Li, Lin Wei, Zhongju Ye, Hua Liu, Lehui Xiao
Revealing the diffusion dynamics of nanoparticles on a lipid membrane plays an important role in a better understanding of the cellular translocation process and provides a theoretical basis for the rational design of delivery cargo. However, most studies focus on the investigation of the positional fluctuations of the nanocargo on the fluidic membrane, ignoring the contribution from orientational variation. In particular, less is known about the correlation between the rotational freedom and translational movability of a particle surveying a lipid membrane...
May 15, 2019: Nanoscale
Tong-An Bu, Yu-Chen Hao, Wen-Yan Gao, Xin Su, Li-Wei Chen, Nan Zhang, An-Xiang Yin
Photocatalytic nitrogen fixation can produce ammonia from nitrogen and water under ambient conditions in the presence of sunlight. Here, we report that alkali metal cations (Li+, Na+, and K+) can significantly promote nitrogen activation and plasmonic nanocrystals (Au and Ag) can sensitize photocatalysts under visible light. The ammonia yield and selectivity on Au/P25 under UV-vis irradiation could be increased from 0.085 mmol g-1 h-1 and 75% to 0.43 mmol g-1 h-1 and 94.5% when promoted by K+, showing a visible-light-driven activity of 0...
May 15, 2019: Nanoscale
Pengcheng Du, Wenli Wei, Yuman Dong, Dong Liu, Qi Wang, Yi Peng, Shaowei Chen, Peng Liu
Rechargeable lithium-sulfur batteries have emerged as a viable technology for next generation electrochemical energy storage, and the sulfur cathode plays a critical role in determining the device performance. In this study, we prepared functional composites based on polypyrrole-coated MnO2 nanotubes as a highly efficient sulfur host (sulfur mass loading 63.5%). The hollow interior of the MnO2 nanotubes not only allowed for accommodation of volumetric changes of sulfur particles during the cycling process, but also confined the diffusion of lithium polysulfides by physical restriction and chemical adsorption, which minimized the loss of polysulfide species...
May 15, 2019: Nanoscale
Lauren Cantley, Jacob L Swett, David Lloyd, David A Cullen, Ke Zhou, Peter V Bedworth, Scott Heise, Adam J Rondinone, Zhiping Xu, Steve Sinton, J Scott Bunch
With the ability to selectively control ionic flux, biological protein ion channels perform a fundamental role in many physiological processes. For practical applications that require the functionality of a biological ion channel, graphene provides a promising solid-state alternative, due to its atomic thinness and mechanical strength. Here, we demonstrate that nanopores introduced into graphene membranes, as large as 50 nm in diameter, exhibit inter-cation selectivity with a ∼20× preference for K+ over divalent cations and can be modulated by an applied gate voltage...
May 15, 2019: Nanoscale
Yang Yang, Gui-Bing Hu, Wen-Bin Liang, Li-Ying Yao, Wei Huang, Ruo Yuan, Dong-Rong Xiao
3D bulk metal-organic frameworks (MOFs) have received growing interest in electrochemiluminescence (ECL) assays because they can provide a high specific surface for loading a large quantity of ECL luminophores, but the ECL efficiency of bulk MOFs is still low since some interior luminophores are difficult to be excited. Herein, an ultrathin 2D metal-organic layer (MOL) for grafting self-enhanced ruthenium complexes (Ru-l-Lys) was first synthesized to greatly increase the utilization ratio of luminophores. Compared with 3D bulk MOFs, ultrathin 2D MOL could provide more accessible postmodification sites for grafting the Ru-l-Lys complexes; the self-enhanced Ru-l-Lys complexes on MOL were easily excited by electrons due to the shortened ion/electron-transport distance and the removal of diffusion barriers...
May 15, 2019: Nanoscale
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