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https://www.readbyqxmd.com/read/29140396/a-2d-self-assembled-mos2-znin2s4-heterostructure-for-efficient-photocatalytic-hydrogen-evolution
#1
Weijia Li, Zhaoyong Lin, Guowei Yang
Semiconductor photocatalysis for hydrogen production is a promising route to address current energy demands. It is still a great challenge to spatially separate photogenerated electrons and holes in bulk photocatalysts because of the long carrier transport pathway from the bulk to the surface. 2D heterostructured photocatalysts with the type II band alignment can not only shorten the carrier transport pathway, but also create an electric field at the interface to suppress the carrier recombination. However, ultrathin and intimate-contact 2D heterostructured photocatalysts have rarely been achieved so far...
November 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/29139517/nanofibre-preparation-of-non-processable-polymers-by-solid-state-polymerization-of-molecularly-self-assembled-monomers
#2
Jian Zhu, Yichun Ding, Seema Agarwal, Andreas Greiner, Hean Zhang, Haoqing Hou
Polybisbenzimidazobenzophenanthroline-dione (BBB) is a high-performance polymer which is characterized by very high mechanical strength in combination with exceptional thermal stability, but it cannot be processed to electrospun fibres for any useful applications due to its insolubility and infusibility. We overcame all obstacles in the electrospinning of BBB by a new bottom-up, and facile approach for the solid-state polymerization of self-assembled monomer precursors. Key to this new strategy is the incorporation of a high molecular weight sacrificial polymer to aid in fibre formation...
November 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/29139512/bright-type-ii-photoluminescence-from-mn-doped-cds-znse-zns-quantum-dots-with-mn-2-ions-as-exciton-couplers
#3
Ruilin Xu, Chen Liao, Yanqing Xu, Chunfeng Zhang, Min Xiao, Lei Zhang, Changgui Lu, Yiping Cui, Jiayu Zhang
Mn(2+) ions were introduced as exciton couplers to enhance the quantum yield (QY) of type-II photoluminescence (PL) from CdS/ZnSe/ZnS quantum dots (QDs) with slow hot-exciton cooling and low radiative rate. Transient absorption spectroscopy verifies the faster bleach recovery and faster peak red-shifting at the charge-transfer state. And the transient PL peak of the QDs changes from blue-shifting to red-shifting due to Mn(2+) doping. The QY of type-II PL can be enhanced from ∼35% to ∼60% by Mn(2+) doping...
November 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/29138789/preferential-s-se-occupation-in-an-anisotropic-res2-1-x-se2x-monolayer-alloy
#4
Wen Wen, Junhao Lin, Kazu Suenaga, Yuzheng Guo, Yiming Zhu, Hung-Pin Hsu, Liming Xie
Band structure engineering of two-dimensional (2D) metal dichalcogenides (TMDs) is crucial for their light-matter interaction and optoelectronic applications. Alloying of different metal or chalcogen elements with different stoichiometries in TMDs provides a versatile and efficient approach for modulating the electronic structure and properties of 2D materials. In 2D alloys, quantification of spatial distribution and local coordination of atoms facilitates the establishment of the structure-property relationship at the atomic scale...
November 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/29138787/super-resolution-imaging-by-metamaterial-based-compressive-spatial-to-spectral-transformation
#5
Qian Ma, Huan Hu, Eric Huang, Zhaowei Liu
We present a new far-field super-resolution imaging approach called compressive spatial to spectral transformation microscopy (CSSTM). The transformation encodes the high-resolution spatial information to a spectrum through illuminating sub-diffraction-limited and wavelength-dependent patterns onto an object. The object is reconstructed from scattering spectrum measurements in the far field. The resolution of the CSSTM is mainly determined by the materials used to perform the spatial to spectral transformation...
November 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/29135011/hierarchical-self-assembly-of-enantiopure-and-racemic-helicenes-at-the-liquid-solid-interface-from-2d-to-3d
#6
Hai Cao, Andrea Minoia, Inge De Cat, Johannes Seibel, Deepali Waghray, Zhi Li, David Cornil, Kunal S Mali, Roberto Lazzaroni, Wim Dehaen, Steven De Feyter
The performance of organic nanostructures is closely related to the organization of the functional molecules. Frequently, molecular chirality plays a central role in the way molecules assemble at the supramolecular level. Herein we report the hierarchical self-assembly of benzo-fused tetrathia[7]helicenes on solid surfaces, from a single surface-bound molecule to well-defined microstructures, using a combination of various characterization techniques assisted by molecular modeling simulations. Similarities as well as discrepancies are revealed between homochiral and heterochiral aggregations by monitoring the hierarchical nucleation of helicenes on surfaces, where the impact of enantiopurity, concentration and adsorbate-substrate interaction on molecular organization are disclosed...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29135009/bacterial-species-identifiable-magnetic-nanosystems-for-early-sepsis-diagnosis-and-extracorporeal-photodynamic-blood-disinfection
#7
Jianhao Wang, Hao Wu, Yanmei Yang, Rong Yan, Yuan Zhao, Yanhao Wang, Aihong Chen, Shilong Shao, Pengju Jiang, Yong-Qiang Li
Despite the numerous bacteria detection and elimination techniques available nowadays, sensitive diagnosis and treatment of sepsis (caused by the presence of bacteria in the bloodstream), especially at the early stage, remain big challenges. Here we report a nanosystem for early sepsis diagnosis and complete extracorporeal blood disinfection, based on iron oxide magnetic nanoparticles functionalized with chlorin e6 molecules and bacterial species-identifiable aptamers (Fe3O4-Ce6-Apt). We demonstrate that the Fe3O4-Ce6-Apt nanosystem can achieve simultaneous blood bacterial species identification and enrichment in a single step, and the enriched bacteria can be easily detected with the assistance of fluorescence microscopic determination...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29135007/nanoscale-imaging-and-force-probing-of-biomolecular-systems-using-atomic-force-microscopy-from-single-molecules-to-living-cells
#8
REVIEW
Mi Li, Dan Dang, Ning Xi, Yuechao Wang, Lianqing Liu
Due to the lack of adequate tools for observation, native molecular behaviors at the nanoscale have been poorly understood. The advent of atomic force microscopy (AFM) provides an exciting instrument for investigating physiological processes on individual living cells with molecular resolution, which attracts the attention of worldwide researchers. In the past few decades, AFM has been widely utilized to investigate molecular activities on diverse biological interfaces, and the performances and functions of AFM have also been continuously improved, greatly improving our understanding of the behaviors of single molecules in action and demonstrating the important role of AFM in addressing biological issues with unprecedented spatiotemporal resolution...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29135001/nanomaterials-for-the-optical-detection-of-fluoride
#9
REVIEW
Yongming Guo, Jing Li, Shuming Chai, Jingjing Yao
Overexposure to fluoride ions (F(-)) causes serious diseases in human beings. Extensive efforts have been made to develop sensitive and selective approaches for F(-) detection and a variety of F(-) sensors have been constructed recently. The burgeoning nanotechnology has provided novel materials for F(-) analysis due to the extraordinary properties of nanomaterials. In this review, we present the recent advances in different nanomaterials-based approaches for the optical F(-) detection via colorimetric, fluorescent and chemiluminescent responses...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29135000/bioconjugated-fluorescent-organic-nanoparticles-targeting-egfr-overexpressing-cancer-cells
#10
Adrien Faucon, Houda Benhelli-Mokrani, Fabrice Fleury, Stéphanie Dutertre, Marc Tramier, Joanna Boucard, Lénaïc Lartigue, Steven Nedellec, Philippe Hulin, Eléna Ishow
The field of optical bioimaging has considerably flourished with the advent of sophisticated microscopy techniques and ultra-bright fluorescent tools. Fluorescent organic nanoparticles (FONs) have thus recently appeared as very attractive labels for their high payload, absence of cytotoxicity and eventual biodegradation. Nevertheless, their bioconjugation to target specific receptors with high imaging contrast is scarcely performed. Moreover, assessing the reality of bioconjugation represents high challenges given the sub-nanomolar concentrations resulting from the commonly adopted nanoprecipitation fabrication process...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29134999/micelle-assisted-electrodeposition-of-highly-mesoporous-fe-pt-nodular-films-with-soft-magnetic-and-electrocatalytic-properties
#11
Eloy Isarain-Chávez, Maria Dolors Baró, Eva Pellicer, Jordi Sort
Mesoporous Fe-Pt nodular films (with a regular spatial arrangement of sub-15 nm pores) are grown onto evaporated Au, Cu and Al conductive layers by micelle-assisted electrodeposition from metal chloride salts in the presence of Pluronic P123 tri-block copolymer dissolved in the aqueous electrolytic bath. This synthetic approach constitutes a simple, one-step, versatile procedure to grow multifunctional mesoporous layers appealing for diverse applications that take advantage of materials with an ultra-high surface area-to-volume ratio...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29134998/2d-molybdenum-and-vanadium-nitrides-synthesized-by-ammoniation-of-2d-transition-metal-carbides-mxenes
#12
Patrick Urbankowski, Babak Anasori, Kanit Hantanasirisakul, Long Yang, Lihua Zhang, Bernard Haines, Steven J May, Simon J L Billinge, Yury Gogotsi
MXenes are a rapidly growing class of 2D transition metal carbides and nitrides, finding applications in fields ranging from energy storage to electromagnetic interference shielding and transparent conductive coatings. However, while more than 20 carbide MXenes have already been synthesized, Ti4N3 and Ti2N are the only nitride MXenes reported so far. Here by ammoniation of Mo2CTx and V2CTx MXenes at 600 °C, we report on their transformation to 2D metal nitrides. Carbon atoms in the precursor MXenes are replaced with N atoms, resulting from the decomposition of ammonia molecules...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29134996/photo-cross-linked-perylene-diimide-derivative-materials-as-efficient-electron-transporting-layers-in-inverted-polymer-solar-cells
#13
Yong-Jin Noh, Yu-Jin Choi, Ji-Ho Jeong, Seok-Soon Kim, Kwang-Un Jeong, Seok-In Na
We present an efficient and stable interfacial material based on a water-soluble perylene diimide derivative functionalized with ionic and methacrylate groups (abbreviated as PDIM), which can be stabilized by the photo-polymerization of diacrylate groups at both ends of the side chain in the PDIM. The characteristics of the photo-cross-linked PDIM films were examined using absorption spectra, cyclic voltammetry, work function, and surface morphology. The feasibility of the photo-cross-linked PDIM films as a novel electron transporting layer (ETL) in polymer solar cells (PSCs) was also investigated...
November 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/29131232/homogenous-graphene-oxide-peptide-nanofiber-hybrid-hydrogel-as-biomimetic-polysaccharide-hydrolase
#14
Xingxing He, Fuyuan Zhang, Jifeng Liu, Guozhen Fang, Shuo Wang
Cellulose, an impressive potential sustainable fuel, is difficult to hydrolyze because of the protection of β-1,4-glycosidic bonds through the tight hydrogen bonding network. In this study, homogenous graphene oxide (GO)-peptide nanofiber hybrid hydrogels (GO-PNFs) were designed as a β-glycosyl hydrolase mimetic to achieve efficient degradation of cellobiose and cellopentaose. For comparison, free peptides, graphene oxide mixed with free peptides (GO-peptdies) and self-assembled peptide nanofibers (PNFs) were also studied for their activity as a hydrolase mimetics for degradation of cellobiose...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29131231/a-strain-induced-exciton-transition-energy-shift-in-cdse-nanoplatelets-the-impact-of-an-organic-ligand-shell
#15
A Antanovich, A W Achtstein, A Matsukovich, A Prudnikau, P Bhaskar, V Gurin, M Molinari, M Artemyev
We study the influence of surface passivating ligands on the optical and structural properties of zinc blende CdSe nanoplatelets. Ligand exchange of native oleic acid with aliphatic thiol or phosphonic acid on the surface of nanoplatelets results in a large shift of exciton transition energy for up to 240 meV. Ligand exchange also leads to structural changes (strain) in the nanoplatelet's core analysed by wide-angle X-ray diffraction. By correlating the experimental data with theoretical calculations we demonstrate that the exciton energy shift is mainly caused by the ligand-induced anisotropic transformation of the crystalline structure altering the well width of the CdSe core...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29131229/phonon-coupling-and-transport-in-individual-polyethylene-chains-a-comparison-study-with-the-bulk-crystal
#16
Xinjiang Wang, Massoud Kaviany, Baoling Huang
Using the first-principles-based anharmonic lattice dynamics, we calculate the thermal conductivities (κ) of both bulk and single-chain polyethylene (PE) and characterize the mode-wise phonon transport and scattering channels. A significantly higher room-temperature axial thermal conductivity in single-chain PE (1400 W m(-1) K(-1)) is observed compared to bulk PE crystals (237 W m(-1) K(-1)). The reduction of scattering phase space caused by the diminished inter-chain van der Waals interactions explains the much larger κ in single-chain PE...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29131227/controlling-electron-and-energy-transfer-paths-by-selective-excitation-in-a-zinc-porphyrin-bodipy-c60-multi-modular-triad
#17
Christopher O Obondi, Gary N Lim, Priscilla Martinez, Varghese Swamy, Francis D'Souza
A multi-modular donor-acceptor triad composed of zinc porphyrin, BF2-chelated dipyrromethene (BODIPY), and C60 was newly synthesized, with the BODIPY entity at the central position. Using absorbance and emission spectral, electrochemical redox, and computational optimization results, energy level diagrams for the ZnP-BODIPY dyad and ZnP-BODIPY-C60 triad were constructed to envision the different photochemical events upon selective excitation of the BODIPY and ZnP entities. By transient absorption spectral studies covering a wide femtosecond-to-millisecond time scale, evidence for the different photochemical events and their kinetic information was secured...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29131226/a-new-general-approach-to-synthesizing-filled-and-yolk-shell-structured-metal-oxide-microspheres-by-applying-a-carbonaceous-template
#18
Young Jun Hong, Kwang Chul Roh, Jung-Kul Lee, Yun Chan Kang
New mechanisms were found for the formation of metal oxide microspheres with yolk-shell and filled structures by applying carbonaceous template microspheres with high porosity. Repeated impregnation first adopted to achieve a high loading rate of metal precursor in the carbonaceous template provided the breakthrough. The carbonaceous template with an appropriate loading rate of the metal precursor produced metal oxide microspheres with filled and yolk-shell structure depending on the ramping rate and oxygen concentration during the post-treatment process...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29131224/single-nanoparticles-magnetization-curves-by-controlled-tip-magnetization-magnetic-force-microscopy
#19
Livia Angeloni, Daniele Passeri, Stella Corsetti, Davide Peddis, Diego Mantovani, Marco Rossi
The development of high spatial resolution and element sensitive magnetic characterization techniques to quantitatively measure magnetic parameters of individual nanoparticles (NPs) and deeply understand and tune their magnetic properties is a hot topic in nanomagnetism. Magnetic force microscopy (MFM), thanks to its high lateral resolution, appears as a promising technique for the magnetic characterization of single nano-sized materials although it is still limited by some drawbacks, especially by the presence of electrostatic artifacts...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29131223/enhancing-the-sensitivity-of-dna-detection-by-structurally-modified-solid-state-nanopore
#20
Kidan Lee, Hyomin Lee, Seung-Hyun Lee, Hyun-Mi Kim, Ki-Bum Kim, Sung Jae Kim
Solid-state nanopore is an ionic current-based biosensing platform, which would be a top candidate for next-generation DNA sequencing and a high-throughput drug-screening tool at single-molecular-scale resolution. There have been several approaches to enhance the sensitivity and reliability of biomolecule detection using the nanopores particularly in two aspects: signal-to-noise ratio (SNR) and translocation dwell time. In this study, an additional nano-well of 100-150 nm diameter and the aspect ratio of ∼5 called 'guide structure' was inserted in conventional silicon-substrate nanopore device to increase both SNR and dwell time...
November 13, 2017: Nanoscale
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