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Nanoscale

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https://www.readbyqxmd.com/read/28443940/facile-processes-for-producing-robust-transparent-conductive-platinum-nanofiber-mats
#1
Seongpil An, Yong Il Kim, Sumit Sinha-Ray, Min-Woo Kim, Hong Seok Jo, Mark T Swihart, Alexander L Yarin, Sam S Yoon
Mechanically robust freestanding platinum (Pt) nanofiber (NF) meshes are of great interest in applications where the corrosion resistance, malleability, and stability of a pure platinum structure must be combined with high surface area for catalysis. For photoelectrochemical applications, transparent electrodes are desirable. Several 1-dimensional (1D) Pt-based materials have been developed, but energy-intensive fabrication techniques and unsatisfactory performance have limited their practical implementation in next-generation photoelectrochemical applications...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443939/magnetic-fano-resonance-induced-second-harmonic-generation-enhancement-in-plasmonic-metamolecule-rings
#2
Da-Jie Yang, Song-Jin Im, Gui-Ming Pan, Si-Jing Ding, Zhong-Jian Yang, Zhong-Hua Hao, Li Zhou, Qu-Quan Wang
The "artificial magnetic" resonance in plasmonic metamolecules extends the potential application of magnetic resonance from terahertz to optical frequency bypassing the problem of magnetic response saturation by replacing the conduction current with the ring displacement current. So far, the magnetic Fano resonance-induced nonlinearity enhancement in plasmonic metamolecule rings has not been reported. Here, we use the magnetic Fano resonance to enhance second-harmonic generation (SHG) in plasmonic metamolecule rings...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443936/effects-of-graphene-defects-on-gas-sensing-properties-towards-no2-detection
#3
Filiberto Ricciardella, Sten Vollebregt, Tiziana Polichetti, Mario Miscuglio, Brigida Alfano, Maria L Miglietta, Ettore Massera, Girolamo Di Francia, Pasqualina M Sarro
The crystal structure of graphene flakes is expected to significantly affect their sensing properties. Here we report an experimental investigation on the crystalline structure of graphene aimed at exploring the effects on the gas sensing properties. The morphology of graphene, prepared via Chemical Vapor Deposition (CVD), Liquid Phase Exfoliation (LPE) and Mechanical Exfoliation (ME), is inspected through Raman spectroscopy, Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). CVD and LPE-graphene structures are found to be more defective with respect to ME-graphene...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443933/high-performance-schottky-heterojunction-photodetector-with-directly-grown-graphene-nanowalls-as-electrodes
#4
Jun Shen, Xiangzhi Liu, Xuefen Song, Xinming Li, Jun Wang, Quan Zhou, Shi Luo, Wenlin Feng, Xingzhan Wei, Shirong Lu, Shuanglong Feng, Chunlei Du, Yuefeng Wang, Haofei Shi, Dapeng Wei
Schottky heterojunctions based on graphene-silicon structures are promising for high-performance photodetectors. However, existing fabrication processes adopt transferred graphene as electrodes, limiting process compatibility and generating pollution because of the metal catalyst. In this report, photodetectors are fabricated using directly grown graphene nanowalls (GNWs) as electrodes. Due to the metal-free growth process, GNWs-Si heterojunctions with an ultralow measured current noise of 3.1 fA Hz(-1/2) are obtained, and the as-prepared photodetectors demonstrate specific detectivities of 5...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443911/fabrication-of-plasmonic-au-pd-alloy-nanoparticles-for-photocatalytic-suzuki-miyaura-reactions-under-ambient-conditions
#5
Dongxu Han, Zongbi Bao, Huabin Xing, Yiwen Yang, Qilong Ren, Zhiguo Zhang
The Suzuki-Miyaura reaction is one of the most popular and efficient routes for the formation of carbon-carbon bonds in both laboratorial and industrial synthetic processes. Here, we report for the first time that a Au-Pd/TiO2 catalyst could be utilized efficiently for Suzuki-Miyaura reactions at ambient conditions under visible light with high activity and reusability. Mechanistic investigation by means of experimental methods revealed that through the strong local surface plasma resonance of Au under the visible light, the hot electrons of Au could be injected into Pd in the bimetallic nanoparticles, thus facilitating activation of the aryl halides...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443904/na3v2-po4-3-nitrogen-sulfur-codoped-3d-porous-carbon-enabling-ultra-long-cycle-life-sodium-ion-batteries
#6
Yu Jiang, Haochuan Zhang, Hai Yang, Zhenyu Qi, Yan Yu
Na3V2(PO4)3 (NVP) is regarded as a promising cathode material for sodium ion batteries (NIBs) because of its 3D open structure suitable for Na insertion/extraction and high energy density. However, the NVP suffers from poor electrical conductivity, which restricts the rate performance and the long cycle performance of the NVP for NIBs. Here, the NVP particles embedded in the N,S co-doped 3D porous carbon matrix (denoted as NVP@3D-NSC) were prepared by a facile process. The NVP@3D-NSC can deliver high specific discharge capacities at high rates (54 mA h g(-1) at 80 C)...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443903/graphene-bubbles-and-their-role-in-graphene-quantum-transport
#7
Nicolas Leconte, Hakseong Kim, Ho-Jong Kim, Dong Han Ha, Kenji Watanabe, Takashi Taniguchi, Jeil Jung, Suyong Jung
Graphene bubbles are often formed when graphene and other layered two-dimensional materials are vertically stacked as van der Waals heterostructures. Here, we investigate how graphene bubbles and their related disorder impact the quantum transport behavior of graphene in the absence and presence of external magnetic fields. By combining experimental observations and numerical simulations, we find that the disorder induced by the graphene bubbles is mainly from p-type dopants and the charge transport in pristine graphene can be severely influenced by the presence of bubbles via long- and short-range scattering even with a small bubble-coverage of 2% and below...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443901/roles-of-conducting-filament-and-non-filament-regions-in-the-ta2o5-and-hfo2-resistive-switching-memory-for-switching-reliability
#8
Tae Hyung Park, Hae Jin Kim, Woo Young Park, Soo Gil Kim, Byung Joon Choi, Cheol Seong Hwang
The endurance of switching cycles, which is a critical measure of device reliability, in an ultra-thin (1.5 nm) Ta2O5 and HfO2 resistive random access (ReRAM) memory cell with a 28 nm lateral dimension was studied using current-voltage (I-V) sweep and closed-loop pulse switching (CLPS) tests. The two devices showed the typical oxygen-deficient conducting-filament (CF)-mediated bipolar resistance switching behaviour, which was induced by the asymmetric electrode configuration: Ta as the oxygen vacancy (VO) source/reservoir and TiN as the inert electrode...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443896/an-msn-peg-ip-drug-delivery-system-and-il13r%C3%AE-2-as-targeted-therapy-for-glioma
#9
Jinlong Shi, Shiqiang Hou, Jianfei Huang, Shanshan Wang, Wei Huan, Chuanjun Huang, Xiaojiang Liu, Rui Jiang, Wenbo Qian, Jingjing Lu, Xiubing Wang, Wei Shi, Rongqin Huang, Jian Chen
A combination of gene therapy and chemotherapy has recently received interest as a targeted therapy for glioma. A mesoporous silica nanoparticle (MSN)-based vehicle coated with IL13Rα2-targeted peptide (IP) using polyethylene glycol (PEG), MSN-PEG-IP (MPI), was constructed and confirmed as a potential glioma-targeted drug delivery system in vitro. In this work, tissue microarray (TMA) results revealed that IL13Rα2 was over-expressed in human glioma tissues and that high expression of IL13Rα2 in patients was associated with poor survival...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443893/trail-np-hybrids-for-cancer-therapy-a-review
#10
REVIEW
H Belkahla, G Herlem, F Picaud, T Gharbi, M Hémadi, S Ammar, O Micheau
Cancer is a worldwide health problem. It is now considered as a leading cause of morbidity and mortality in developed countries. In the last few decades, considerable progress has been made in anti-cancer therapies, allowing the cure of patients suffering from this disease, or at least helping to prolong their lives. Several cancers, such as those of the lung and pancreas, are still devastating in the absence of therapeutic options. In the early 90s, TRAIL (Tumor Necrosis Factor-related apoptosis-inducing ligand), a cytokine belonging to the TNF superfamily, attracted major interest in oncology owing to its selective anti-tumor properties...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443889/the-passivating-effect-of-cadmium-in-pbs-cds-colloidal-quantum-dots-probed-by-nm-scale-depth-profiling
#11
Pip C J Clark, Hanna Radtke, Atip Pengpad, Andrew I Williamson, Ben F Spencer, Samantha J O Hardman, Marina A Leontiadou, Darren C J Neo, Simon M Fairclough, Andrew A R Watt, Igor Pis, Silvia Nappini, Federica Bondino, Elena Magnano, Karsten Handrup, Karina Schulte, Mathieu G Silly, Fausto Sirotti, Wendy R Flavell
Achieving control of the surface chemistry of colloidal quantum dots (CQDs) is essential to fully exploit their properties in solar cells, but direct measurement of the chemistry and electronic structure in the outermost atomic layers is challenging. Here we probe the surface oxidation and passivation of cation-exchanged PbS/CdS core/shell CQDs with sub nm-scale precision using synchrotron-radiation-excited depth-profiling photoemission. We investigate the surface composition of the topmost 1-2.5 nm of the CQDs as a function of depth, for CQDs of varying CdS shell thickness, and examine how the surface changes after prolonged air exposure...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443857/adhesion-contact-deformation-in-nanobridge-tests
#12
Yao Gao, San-Qiang Shi, Tong-Yi Zhang
An accurate grasp of the mechanical properties, especially Young's moduli, of one dimensional nanomaterials plays a crucial role in the design and safe service of flexible electronic devices and implanted biomedical sensors. Nanobridge tests are widely used in the characterization of the mechanical properties of nanowires. In these tests, an atomic force microscope (AFM), functioning as a test machine, exerts a force to bend a nanowire suspended across a trench or a hole with the two ends fixed on a template or substrate...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440838/detection-and-sizing-of-nanoparticles-and-dna-on-pdms-nanofluidic-chips-based-on-differential-resistive-pulse-sensing
#13
Ran Peng, Dongqing Li
The RPS (Resistive Pulse Sensing) technique is a popular tool for the label-free detection of particles. This paper describes a simple, cost-effective PDMS nanofluidic chip for the detection and characterization of nanoparticles based on the differential RPS technique with high resolution and sensitivity. The chip is composed of two layers of PDMS slabs. Microchannel systems fabricated by the photolithography method on the top layer are used for sample loading and differential signal acquisition, and a straight nanochannel on the bottom layer fabricated by an unconventional approach bridging the gap between the microchannels works as an RPS sensing gate...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440837/modelling-of-thermal-transport-through-a-nanocellular-polymer-foam-toward-the-generation-of-a-new-superinsulating-material
#14
Guilong Wang, Chongda Wang, Jinchuan Zhao, Guizhen Wang, Chul B Park, Guoqun Zhao
Superinsulating materials play a pivotal role in achieving the sustainable development of our modern world by improving energy efficiency, and reducing energy consumption and CO2 emission. Nanocellular polymer foams have been considered as a promising superinsulating material, but their development is yet to be achieved. The understanding of thermal transport through the nanocellular foam is crucial for developing this superinsulating material. Herein, we report an accurate mathematical model for the first time to quantitatively estimate thermal transport through the nanocellular polymer foam...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440836/controllable-hydrothermal-synthesis-of-ni-h-bea-with-a-hierarchical-core-shell-structure-and-highly-enhanced-biomass-hydrodeoxygenation-performance
#15
Bing Ma, Huimei Cui, Darui Wang, Peng Wu, Chen Zhao
Ni based catalysts are wildly used in catalytic industrial processes due to their low costs and high activities. The design of highly hierarchical core-shell structured Ni/HBEA is achieved using a sustainable, simple, and easy-tunable hydrothermal synthesis approach using combined NH4Cl and NH3·H2O as a co-precipitation agent at 120 °C. Starting from a single-crystalline hierarchical H(+)-exchanged beta polymorph zeolite (HBEA), the adjustment of the precipitate conditions shows that mixed NH4Cl and NH3·H2O precipitates with proper concentrations are vital in the hydrothermal synthesis for preserving a good crystalline morphology of HBEA and generating abundant highly-dispersed Ni nanoparticles (loading: 41 wt%, 5...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440835/the-generation-of-compartmentalized-nanoparticles-containing-sirna-and-cisplatin-using-a-multi-needle-electrohydrodynamic-strategy
#16
Maria F Pina, Wai Lau, Kathrin Scherer, Maryam Parhizkar, Mohan Edirisinghe, Duncan Craig
This study outlines a novel manufacturing technique for the generation of compartmentalized trilayered nanoparticles loaded with an anti-cancer agent and siRNA as a platform for the combination treatment of cancers. More specifically, we describe the use of a multi-needle electrohydrodynamic approach to produce nanoparticles with high size specificity and scalable output, while allowing suitable environments for each therapeutic agent. The inner polylactic-glycolic-acid (PLGA) layer was loaded with cisplatin while the middle chitosan layer was loaded with siRNA...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440832/nanoemitters-and-innate-immunity-the-role-of-surfactants-and-bio-coronas-in-myeloperoxidase-catalyzed-oxidation-of-pristine-single-walled-carbon-nanotubes
#17
Cheuk Fai Chiu, Haider H Dar, Alexandr A Kapralov, Renã A S Robinson, Valerian E Kagan, Alexander Star
Single-walled carbon nanotubes (SWCNTs) are experimentally utilized in in vivo imaging and photothermal cancer therapy owing to their unique physicochemical and electronic properties. For these applications, pristine carbon nanotubes are often modified by polymer surfactant coatings to improve their biocompatibility, adding more complexity to their recognition and biodegradation by immuno-competent cells. Here, we investigate the oxidative degradation of SWCNTs catalyzed by neutrophil myeloperoxidase (MPO) using bandgap near-infrared (NIR) photoluminescence and Raman spectroscopy...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440826/realization-of-multiphoton-lasing-from-carbon-nanodot-microcavities
#18
Wenfei Zhang, Yiqun Ni, Xuhui Xu, Wei Lu, Pengpeng Ren, Peiguang Yan, Chun Kit Siu, Shuangchen Ruan, Siu Fung Yu
The use of organosilane chains to link carbon nanodots (CDs) through organosilane surface functional groups is proposed to improve the efficiency of multiphoton absorption. As a result, a large absorption coefficient of 1.16 × 10(-6) cm(5) per GW(3) is obtained and four-photon luminescence under 1900 nm excitation is observed from the CDs at room temperature. Furthermore, a CD laser, which demonstrates random lasing under three-photon (i.e. 1400 nm) excitation, can be realized by sandwiching a CD film between a quartz substrate and a dielectric mirror...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440825/radio-frequency-negative-permittivity-in-random-carbon-nanotubes-alumina-nanocomposites
#19
Chuanbing Cheng, Runhua Fan, Yanrong Ren, Tao Ding, Lei Qian, Jiang Guo, Xiaofeng Li, Liqiong An, Yanhua Lei, Yansheng Yin, Zhanhu Guo
While metal is the most common conductive constituent element in the preparation of metamaterials, one-dimensional conductive carbon nanotubes (CNTs) provide alternative building blocks. Here alumina (Al2O3) nanocomposites with multi-walled carbon nanotubes (MWCNTs) uniformly dispersed in the alumina matrix were prepared by hot-pressing sintering. As the MWCNT content increased, the formed conductive MWCNT networks led to the occurrence of the percolation phenomenon and a change of the conductive mechanism...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440820/a-pre-strain-strategy-for-developing-a-highly-stretchable-and-foldable-one-dimensional-conductive-cord-based-on-a-ag-nanowire-network
#20
Areum Kim, Jihoon Ahn, Hyewon Hwang, Eunsong Lee, Jooho Moon
A highly stretchable and foldable conductive cord was developed by depositing silver nanowires (AgNWs) on a polyurethane cord. The application of pre-strain to the cord during the deposition of AgNWs resulted in the formation of a wrinkled AgNW layer, thereby inducing structural stability towards stretching and bending. This conductive cord exhibited stable electric conduction under strain values of up to 167% and at a bending radius of 0.3 mm. Also, it could withstand a stretching test of 500 cycles at a strain of 50%...
April 25, 2017: Nanoscale
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